JP5264302B2 - Imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently remove a foreign matter adhering to a surface of an optical member without influencing accuracy of shutter operation. <P>SOLUTION: The imaging apparatus includes: an infrared cut filter 410 disposed on a photographic optical axis in front of an imaging device 33; piezoelectric elements 430a and 430b giving vibration to the infrared cut filter 410; and a shutter unit 32 arranged in front of the infrared cut filter 410, and equipped with a front curtain blade 602a traveling to an opening state from a shutting state of an aperture during exposure, a rear curtain blade 606a traveling to the shutting state from the opening state of the aperture during exposure, and a drive means performing superposing drive to set the front curtain blade 602a and the rear curtain blade 606a to the opening state from the shutting state of the aperture and developing drive to set them to the shutting state from the opening state of the aperture, wherein the developing drive of the rear curtain blade 606a is performed after the infrared cut filter 410 is vibrated in the shutting state of the front curtain blade 602a. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to an imaging apparatus such as a digital camera, to a removal technique of foreign matter such as dust adhering to the surface of the disposed on the photographing optical axis optical element.

  In an imaging apparatus such as a digital camera that captures an image by converting an image signal into an electrical signal, an imaging light beam is received by an imaging element such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Then, the photoelectric conversion signal output from the image sensor is converted into image data and recorded on a recording medium such as a memory card. In such an imaging apparatus, an optical low-pass filter and an infrared cut filter are arranged in front of the imaging element (subject side).

  In this type of image pickup apparatus, when foreign matter such as dust adheres to the cover glass of the image pickup element or the surface of these filters, the foreign matter becomes a black dot and appears in the photographed image, resulting in a deterioration in the appearance of the image.

  Especially in digital SLR cameras with interchangeable lenses, mechanical operation parts such as shutters and quick return mirrors are arranged in the vicinity of the image sensor, and foreign matters such as dust generated from these operation parts are covered by the cover of the image sensor. May adhere to glass or filter surfaces. In addition, when the lens is replaced, foreign matter such as dust may enter the camera body from the opening of the lens mount and adhere to it.

  Therefore, in Patent Document 1, an optical element that transmits a photographic light beam is provided on the subject side of the imaging element, and this is vibrated by a piezoelectric element, thereby removing foreign matters such as dust attached to the surface of the optical element. Proposed.

JP 2003-338968 A

  According to the above prior art, a voltage is applied to the piezoelectric element joined to the optical element, and driving the piezoelectric element displaces the optical element in the optical axis direction to generate curtain vibration. It is configured to remove the adhered foreign matter. Then, the foreign matter blown off by the curtain vibration is collected by an adhesive disposed on the peripheral edge of the optical element.

  However, usually, in a digital single-lens reflex camera, a shutter device is disposed in the vicinity of the front surface of the optical element, and a part of the foreign matter skipped from the optical element covers the front surface of the optical element. May reattach to the surface of the group.

  If the exposure operation is started in a state where foreign matter has adhered to the surface of the shutter blade group of the shutter device, the foreign matter may enter the shutter device as the shutter blade group is driven. For this reason, there is a problem that foreign matter adheres between the electrical operation unit and the shutter blade group in the shutter device, and the accuracy of the shutter operation may be deteriorated.

  On the other hand, when the foreign matter removal operation of the optical element is performed in the state where the shutter blade group is retracted so as not to reattach to the surface of the shutter blade group (exposure state), the foreign matter floats in the camera body, and the optical element There was a problem that there was a risk of re-adhering.

  The present invention has been made in view of the above problems, and efficiently removes foreign matter adhering to the surface of an optical member disposed in front of the image sensor without affecting the accuracy of the shutter operation. The purpose is to be able to.

  An image pickup apparatus according to the present invention includes an image pickup element that converts an optical image of a subject into an electrical signal, an optical member that is disposed in front of the image pickup element and on a photographing optical axis, and that adds vibration to the optical member. And at least one front curtain blade that is disposed in front of the optical member and that travels from the shielded state of the opening to the open state at the time of exposure, and at least one that travels from the open state of the opening to the shielded state at the time of exposure. Sheet rear curtain blade, superimposed drive for bringing the front curtain blade from the open state to the open state, unfolding drive for making the open state from the open state to the open state, and the rear curtain blade from the open state to the open state And a shutter device having a driving means for performing a superimposing drive from the shielded state of the opening to the open state, and after oscillating the optical member in the shielded state of the front curtain blade, or vibrating the optical member Let In state, characterized in that it comprises a control means for controlling the drive means and the vibrator to expand driving the second curtain blade.

  According to the present invention, it is possible to efficiently remove foreign matters adhering to the surface of an optical member disposed in front of the image sensor without affecting the accuracy of the shutter operation.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In each embodiment, a digital single lens reflex camera functioning as a recording apparatus to which the present invention is applied will be described as an example.
(First embodiment)
1 and 2 are external views of a digital single-lens reflex camera according to the present embodiment. FIG. 1 is a front perspective view of the camera viewed from the subject side, and shows a state in which the taking lens unit is removed. FIG. 2 is a rear perspective view of the camera as seen from the photographer side.

  As shown in FIG. 1, the camera body 1 is provided with a grip portion 1 a that protrudes toward the subject side so that the photographer can stably grip the camera body during shooting.

  A photographic lens unit (not shown in FIGS. 1 and 2) is detachably fixed to the mount portion 2 of the camera body 1. The mount contact 21 enables communication of a control signal, a status signal, a data signal, and the like between the camera body 1 and the photographing lens unit and supplies power to the photographing lens unit. The mount contact 21 may be configured not only for electrical communication but also for optical communication, voice communication, and the like. A lens lock release button 4 that is pushed in when removing the taking lens unit is disposed beside the mount unit 2.

  In the camera body 1, there is provided a mirror box 5 that guides a photographing light beam that has passed through the photographing lens, and a main mirror (quick return mirror) 6 is disposed in the mirror box 5. The main mirror 6 is held at an angle of 45 ° with respect to the photographing optical axis in order to guide the photographing light flux in the direction of the pentaprism 22 (see FIG. 3), and the imaging element 33 (see FIG. 3). In order to guide in the direction, it can be held in a position retracted from the photographing light flux.

  On the grip 1a on the upper side of the camera, a shutter button 7 as a start switch for starting shooting, a main operation dial 8 for setting a shutter speed and a lens aperture value according to an operation mode at the time of shooting, and an upper surface of the shooting system An operation mode setting button 10 is arranged. Some of the operation results of these operation members are displayed on the LCD display panel 9. The shutter button 7 is configured such that SW1 (7a in FIG. 3) is turned on in the first stroke and SW2 (7b in FIG. 3) is turned on in the second stroke. The upper surface operation mode setting button 10 is used to set whether continuous shooting or only one frame shooting is performed when the shutter button 7 is pressed once, setting of a self-shooting mode, and the like. The setting status is displayed on the LCD display panel 9.

  A flash unit 11 that pops up with respect to the camera body 1, a shoe groove 12 for attaching a flash, and a flash contact 13 are provided in the center of the upper part of the camera.

  A shooting mode setting dial 14 is arranged on the right above the camera.

  An external terminal lid 15 that can be opened and closed is provided on the side surface opposite to the grip 1a of the camera. Inside the external terminal lid 15, a video signal output jack 16 and a USB output connector 17 are housed as external interfaces.

  As shown in FIG. 2, a finder eyepiece window 18 is provided above the back of the camera. In addition, a color liquid crystal monitor 19 capable of displaying an image is provided near the center of the back of the camera.

  A sub operation dial 20 is arranged beside the color liquid crystal monitor 19. The sub operation dial 20 plays an auxiliary role in the function of the main operation dial 8. For example, in the AE mode of the camera, it is used to set an exposure correction amount for the appropriate exposure value calculated by the automatic exposure device. In the manual mode in which each of the shutter speed and the lens aperture value is set according to the user's will, the shutter speed is set with the main operation dial 8 and the lens aperture value is set with the sub operation dial 20. The sub operation dial 20 is also used to select display of a photographed image displayed on the color liquid crystal monitor 19.

  Further, a main switch 43 for starting or stopping the operation of the camera and a cleaning instruction operation member 44 for operating the cleaning mode are arranged on the back of the camera. When the cleaning instruction operation member 44 is operated, a cleaning mode in which the user directly cleans the infrared cut filter 410 is started.

  FIG. 3 is a block diagram showing the main electrical configuration of the digital single-lens reflex camera according to the present embodiment. In addition, the same code | symbol is attached | subjected to the part which is common in FIG. A central processing unit (hereinafter, referred to as “MPU”) 100 formed of a microcomputer built in the camera body 1 controls operation of the camera, and executes various processes and instructions for each element. The MPU 100 functions as a control means in the present invention. The EEPROM 100a built in the MPU 100 can store time information of the time measuring circuit 109 and other information.

  Connected to the MPU 100 are a mirror drive circuit 101, a focus detection circuit 102, a shutter drive circuit 103, a video signal processing circuit 104, a switch sense circuit 105, and a photometric circuit 106. Further, an LCD drive circuit 107, a battery check circuit 108, a time measurement circuit 109, a power supply circuit 110, and a piezoelectric element drive circuit 111 are connected. These circuits operate under the control of the MPU 100.

  The MPU 100 communicates with the lens control circuit 201 in the photographing lens unit via the mount contact 21. The mount contact 21 also has a function of transmitting a signal to the MPU 100 when the photographing lens unit is connected. Accordingly, the lens control circuit 201 communicates with the MPU 100 and drives the photographing lens 200 and the diaphragm 204 in the photographing lens unit via the AF driving circuit 202 and the diaphragm driving circuit 203. In FIG. 3, only one photographing lens is shown for the sake of convenience, but actually, it is constituted by a large number of lens groups.

  The AF driving circuit 202 is configured by, for example, a stepping motor, and changes the focus lens position in the photographing lens 200 under the control of the lens control circuit 201 so as to adjust the photographing light beam to be focused on the image sensor 33. The aperture driving circuit 203 is configured by, for example, an auto iris or the like, and changes the aperture 204 under the control of the lens control circuit 201 to obtain an optical aperture value.

  The main mirror 6 guides the photographic light beam passing through the photographic lens 200 to the pentaprism 22 and transmits a part thereof while being held at an angle of 45 ° with respect to the photographic optical axis 50 shown in FIG. Guide to submirror 30. The sub mirror 30 guides the photographing light beam transmitted through the main mirror 6 to the focus detection sensor unit 31.

  The mirror drive circuit 101 is composed of, for example, a DC motor and a gear train, and drives the main mirror 6 to a position where the subject image can be observed by the finder and a position where the subject image is retracted from the photographing light beam. When the main mirror 6 is driven, the sub mirror 30 is simultaneously moved to a position for guiding the imaging light flux to the focus detection sensor unit 31 and a position for retracting from the imaging light flux.

  The focus detection sensor unit 31 includes a field lens, a reflection mirror, a secondary imaging lens, a diaphragm, a line sensor including a plurality of CCDs, and the like that are arranged in the vicinity of an imaging surface (not shown). Perform detection. A signal output from the focus detection sensor unit 31 is supplied to the focus detection circuit 102, converted into a subject image signal, and then transmitted to the MPU 100. The MPU 100 performs focus detection calculation by the phase difference detection method based on the subject image signal. Then, the defocus amount and the defocus direction are obtained, and based on this, the focus lens in the photographing lens 200 is driven to the in-focus position via the lens control circuit 201 and the AF drive circuit 202.

  The pentaprism 22 converts and reflects the photographing light beam reflected by the main mirror 6 into an erect image. The photographer can observe the subject image from the viewfinder eyepiece window 18 through the viewfinder optical system. The pentaprism 22 guides part of the photographic light beam to the photometric sensor 23. The photometric circuit 106 obtains the output of the photometric sensor 23, converts it into a luminance signal for 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.

  The focal plane shutter unit (hereinafter simply referred to as “shutter unit”) 32 is arranged at a position with a slight gap from an infrared cut filter 410 described later. The shutter unit 32 is in a state of blocking the photographing light beam during imaging standby, that is, when the photographer is observing the subject image with the viewfinder. At the time of imaging, a desired exposure time is obtained according to the time difference between the leading blade group and the trailing blade group described later according to the release signal. The shutter unit 32 is controlled by the shutter drive circuit 103 that has received an instruction from the MPU 100. In the present embodiment, the shutter unit 32 corresponds to the shutter device referred to in the present invention. The detailed configuration of the shutter unit 32 will be described later.

  In the imaging unit 400, the infrared cut filter 410, the optical low-pass filter 420, the piezoelectric element 430, and the imaging element 33 are unitized together with other components described later. The detailed configuration will be described later.

  The infrared cut filter 410 is an optical element having a substantially rectangular shape that removes a high spatial frequency. The surface of the infrared cut filter 410 is coated so as to have conductivity in order to prevent adhesion of foreign matters. In the present embodiment, the infrared cut filter 410 corresponds to an optical member disposed in front of the image sensor and on the photographing optical axis.

  The optical low-pass filter 420 is formed by laminating a plurality of birefringent plates and phase plates made of quartz or the like. The optical low-pass filter 420 is an optical element having a substantially rectangular shape that separates the light beam incident on the image sensor 33 into a plurality of parts and effectively reduces the generation of false resolution signals and false color signals.

  The piezoelectric element 430 is fixedly bonded to the infrared cut filter 410 and is driven by the piezoelectric element drive circuit 111 in response to an instruction from the MPU 100 so as to vibrate integrally with the infrared cut filter 410. In the present embodiment, the piezoelectric element 430 corresponds to the vibration means in the present invention.

  The image sensor 33 converts an optical image of a subject into an electrical signal. In this embodiment, a CMOS type imaging device is used, but there are various other types such as a CCD type, and any type of imaging device may be adopted.

  The clamp / CDS (correlated double sampling) circuit 34 performs basic analog processing before A / D conversion, and the clamp level can be changed. The AGC (automatic gain adjusting device) 35 performs basic analog processing before A / D conversion, and can change the AGC basic level. The A / D converter 36 converts the analog output signal of the image sensor 33 into a digital signal.

  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 image data for monitor display from the video signal processing circuit 104 is displayed on the color liquid crystal monitor 19 via the color liquid crystal drive circuit 112. The video signal processing circuit 104 can also store image data in the buffer memory 37 through the memory controller 38 in accordance with an instruction from the MPU 100. Further, the video signal processing circuit 104 can also perform image data compression processing such as JPEG. When continuous shooting is performed, such as continuous shooting, image data can be temporarily stored in the buffer memory 37, and unprocessed image data can be sequentially read out through the memory controller 38. Thereby, 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 has a function of storing the image data input from the external interface 40 in the memory 39 and outputting the image data stored in the memory 39 from the external interface 40. The external interface 40 corresponds to the video signal output jack 16 and the USB output connector 17 in FIG. As the memory 39, a flash memory that can be attached to and detached from the camera body is used.

  When operated by the user, the cleaning instruction operation member 44 receives a command to start the cleaning mode and shifts the camera body 1 to the cleaning mode. In the present embodiment, the cleaning instruction operation member 44 is provided, but the present invention is not limited to this. The operation member for instructing the transition to the cleaning mode is not limited to a mechanical button, but may be an instruction from a menu displayed on the color liquid crystal monitor 19 using a cursor key, an instruction button, or the like. .

  The power supply circuit 110 supplies power necessary for the cleaning mode to each part of the camera body 1 as necessary. In parallel with this, the remaining battery level of the power source 42 is detected, and the result is transmitted to the MPU 100. When the MPU 100 receives the cleaning mode start signal, the MPU 100 drives the main mirror 6 to a position where it is retracted from the photographing light beam via the mirror driving circuit 101, and simultaneously drives the sub mirror 30 to a position where it is retracted from the photographing light beam. Further, the MPU 100 drives the shutter unit 32 to a position where the shutter unit 32 is retracted from the photographing light flux through the shutter driving circuit 103. In this cleaning mode, the user can directly clean the foreign matter on the infrared cut filter 410 using a cotton swab, sylbon paper, rubber or the like.

  The switch sense circuit 105 transmits an input signal to the MPU 100 according to the operation state of each switch. The switch SW1 (7a) is turned on by the first stroke of the shutter button 7. The switch SW2 (7b) is turned on by the second stroke of the shutter button 7. When the switch SW2 (7b) is turned on, an instruction to start photographing is transmitted to the MPU 100. Further, the main operation dial 8, the sub operation dial 20, the photographing mode setting dial 14, the main switch 43, and the cleaning instruction operation member 44 are connected.

  The LCD drive circuit 107 drives the LCD display panel 9 and the in-finder liquid crystal display 41 in accordance with instructions from the MPU 100.

  The battery check circuit 108 performs a battery check according to an instruction from the MPU 100 and transmits the detection result to the MPU 100. The power supply 42 supplies power to each element of the camera.

  The time measuring 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 in accordance with an instruction from the MPU 100.

  Hereinafter, the imaging unit 400 will be described with reference to FIGS. FIG. 4 is an exploded perspective view showing a schematic configuration inside the camera for explaining the peripheral structure of the imaging unit 400. A mirror box 5 and a 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. An imaging unit 400 is disposed on the photographer side of the main body chassis 300. The image pickup unit 400 is adjusted and fixed so that the image pickup surface of the image pickup element 33 is spaced a predetermined distance from and parallel to the attachment surface of the mount unit 2 that serves as a reference to which the photographing lens unit is attached.

  FIG. 5 is an exploded perspective view showing the configuration of the imaging unit 400. The imaging unit 400 is roughly composed of a vibration unit 470, an elastic member 450, and an imaging element unit 500.

  The image sensor unit 500 includes at least an image sensor 33, an image sensor holding member 510, a circuit board 520, a shield case 530, an optical low-pass filter 420, a light shielding member 540, and an optical low-pass filter holding member 550.

  The imaging element holding member 510 is made of metal or the like, and is provided with positioning pins 510a, screw holes 510b, and screw holes 510c. The circuit board 520 is mounted with an imaging electric circuit, and is provided with a screw escape hole 520a. The shield case 530 is made of metal or the like, and is provided with a screw escape hole 530a. The circuit board 520 and the shield case 530 are secured to the image sensor holding member 510 with screws using screw escape holes 520a, screw escape holes 530a, and screw holes 510b. The shield case 530 is connected to a ground potential on the circuit in order to protect the electric circuit from static electricity and the like.

  The light shielding member 540 has an opening corresponding to the effective area of the photoelectric conversion surface of the image sensor 33, and a double-sided tape is fixed to the subject side and the photographer side. The optical low-pass filter holding member 550 is fixed to the cover glass 33 a of the image sensor 33 by the double-sided tape of the light shielding member 540. The optical low-pass filter 420 is positioned at the opening of the optical low-pass filter holding member 550, and is fixed and held on the light shielding member 540 with double-sided tape.

  FIG. 6 is a perspective view showing the configuration of the vibration unit 470 as seen from the photographer side. The vibration unit 470 includes at least an infrared cut filter 410, piezoelectric elements 430a and 430b, and a holding member 460.

  The holding member 460 is formed in a frame shape as a single part from an elastic material such as metal. The holding member 460 includes left and right positioning portions in which positioning holes 460a for positioning with the image sensor holding member 510 are formed. In addition, it has left and right fixing portions in which screw escape holes 460b for fixing (screwing) to the image sensor holding member 510 are formed. In addition, the four corners have holding surfaces 460 c for fixing and holding the infrared cut filter 410. The holding surface 460c is fixed to the infrared cut filter 410 in the vicinity of the four corners including the vibration node by means such as a conductive adhesive. Further, it has upper and lower flat portions 460 d bent in the optical axis direction parallel to the vibration of the infrared cut filter 410.

  The piezoelectric elements 430a and 430b are fixed to the end portion of the rectangular infrared cut filter 410 by bonding or the like. In the present embodiment, a total of two piezoelectric elements having the same shape are fixed to both ends of the infrared cut filter 410.

  The vibration unit 470 thus configured is positioned with respect to the image sensor unit 500 using the positioning holes 460a and the positioning pins 510a. The vibration unit 470 is locked to the image sensor unit 500 with a screw with the elastic member 450 sandwiched between the screw escape hole 460b and the screw hole 510c. As a result, electricity charged on the surface of the infrared cut filter 410 coated so as to have conductivity can be released to the circuit board 520 through the holding member 460, the image sensor holding member 510, and the shield case 530, and the foreign matter. Can be prevented.

  The elastic member 450 is formed of a soft material such as rubber and has a role as a vibration absorbing portion of the infrared cut filter 410 and forms a sealed space between the infrared cut filter 410 and the optical low-pass filter 420. It is desirable that the elastic member 450 is formed of a thick member or a member having a low hardness and abuts on a vibration node of the infrared cut filter 410 in order to increase the vibration absorbability of the infrared cut filter 410.

  7 is a partial cross-sectional view taken along line XX in FIG. The surface on the subject side of the light shielding member 540 is in contact with the optical low-pass filter 420, and the surface on the photographer side is in contact with the cover glass 33 a of the image sensor 33. Double-sided tape is fixed to the subject side and the photographer side of the light shielding member 540, and the optical low-pass filter 420 is fixedly held on the cover glass 33a of the image sensor 33 by the double-sided tape of the light shielding member 540. As a result, the space between the optical low-pass filter 420 and the cover glass 33a of the image sensor 33 is sealed by the light shielding member 540, thereby forming a sealed space that prevents entry of foreign matters such as dust.

  Further, the subject-side surface of the elastic member 450 is in contact with the infrared cut filter 410, and the photographer-side surface is in contact with the optical low-pass filter 420. Since the vibration unit 470 is urged toward the image sensor unit 500 by the elasticity of the holding member 460, the elastic member 450 and the infrared cut filter 410 are in close contact with each other, and the elastic member 450 and the optical low-pass filter 420 are similarly provided. It is in close contact with no gap. As a result, the space between the infrared cut filter 410 and the optical low-pass filter 420 is sealed by the elastic member 450 to form a sealed space that prevents entry of foreign matters such as dust.

  FIG. 8 is a diagram for explaining the piezoelectric elements 430a and 430b. As shown in FIG. 8, the A surface of the piezoelectric element is divided into a + phase for exciting bending vibrations in the infrared cut filter 410 and a G phase. Further, the B surface of the piezoelectric element is electrically connected by a conductive material (not shown) or the like and is kept at the same potential as the G phase of the A surface. A conductive connecting member such as a flexible print (not shown) is fixed to the A surface by adhesion or the like, and a predetermined voltage can be independently applied to the + phase and the G phase. The B surface is fixed to the infrared cut filter 410 by bonding or the like, and the piezoelectric element and the infrared cut filter 410 are configured to move integrally.

  Next, with reference to FIGS. 9 and 10, the mechanism of the vibration of the infrared cut filter 410 and its vibration shape will be described. FIG. 9 is a side view seen from the top of the camera showing the vibration shape when the infrared cut filter 410 vibrates in a mode having 20 nodes. FIG. 10 is a side view seen from the upper surface of the camera showing a vibration shape when the infrared cut filter 410 vibrates in a mode having 19 nodes.

  First, deformation of the piezoelectric elements 430a and 430b and the infrared cut filter 410 when a positive voltage is applied to the + phase of each of the piezoelectric elements 430a and 430b through the conductive connecting member and each G phase is set to the ground (0 V). explain.

  When the voltage described above is applied, the + phase of the piezoelectric elements 430a and 430b contracts in the perpendicular direction and extends in the in-plane direction. Therefore, the joint surface of the infrared cut filter 410 with the piezoelectric elements 430a and 430b receives a force from the piezoelectric elements 430a and 430b to expand the joint surface in the surface direction so that the joint surface side with the piezoelectric elements 430a and 430b becomes convex. Make any deformations. Therefore, when the voltage described above is applied to the + phase of each of the piezoelectric elements 430a and 430b, the infrared cut filter 410 is bent and deformed as indicated by the solid line in FIG.

  Similarly, when a negative voltage is applied to the + phase, the piezoelectric elements 430a and 430b are deformed in the opposite direction of expansion and contraction, and the infrared cut filter 410 is bent and deformed as shown by a two-dot chain line in FIG. At this time, since the same voltage is applied to the + phases of the piezoelectric elements 430a and 430b, the piezoelectric elements 430a and 430b are driven in the same phase.

  Next, a positive voltage is applied to the + phase of the piezoelectric element 430a and a negative voltage is applied to the + phase of the piezoelectric element 430b through the conductive connecting member, and each G phase is set to the ground (0 V). A modification of 430b and the infrared cut filter 410 will be described.

  When the voltage described above is applied, the joint surface between the piezoelectric element 430a and the infrared cut filter 410 is deformed by a mechanism similar to that described above, and the joint surface between the piezoelectric element 430b and the infrared cut filter 410 is deformed. Deforms to become concave. Therefore, when the voltage described above is applied to each + phase of the piezoelectric elements 430a and 430b, the infrared cut filter 410 is bent and deformed as indicated by the solid line in FIG.

  Similarly, when a negative voltage is applied to the + phase of the piezoelectric element 430a and a positive voltage is applied to the + phase of the 430b, the piezoelectric elements 430a and 430b are deformed in the opposite direction of expansion and contraction, and the infrared cut filter 410 has the configuration shown in FIG. Bending deformation as shown by the two-dot chain line occurs. At this time, since a reverse voltage is applied to the + phase of the piezoelectric elements 430a and 430b, the piezoelectric elements 430a and 430b are driven in reverse phase.

  That is, when the voltage applied to the + phase of each of the piezoelectric elements 430a and 430b is periodically switched between positive and negative while the potential of the G-phase electrode is maintained at the ground, the bending so that the unevenness of the infrared cut filter 410 is periodically switched. Vibration occurs. In bending vibration, as shown in FIGS. 9 and 10, vibration nodes (for example, d1, d2, D1, and D2) in which the amplitude of vibration becomes substantially zero appear.

  If the periodic voltages applied to the + phase of each of the piezoelectric elements 430a and 430b are the same phase (same phase drive), bending vibration having a shape in which an even number of vibration nodes appear as shown in FIG. Further, if the periodic voltage applied to the + phase of each of the piezoelectric elements 430a and 430b is shifted by half a wavelength and is in reverse phase (reverse phase drive), an odd number of vibration nodes as shown in FIG. Of bending vibration.

  By setting the frequency of the periodic voltage in the vicinity of the resonance frequency of the natural mode of the infrared cut filter 410, a large amplitude can be obtained with a smaller voltage. The resonance frequency of the eigenmode of the infrared cut filter 410 varies depending on the shape, plate thickness, material, etc. of the infrared cut filter 410, but the eigenmode is selected so that the resonance frequency is outside the audible range so as not to generate unpleasant sound. It is preferable.

  In this embodiment, the mode in which 20 nodes appear and the mode in which 19 nodes appear are described as examples. However, the present invention is not limited to this, and other vibrations may be generated. Alternatively, three or more types of vibration modes may be used.

  Next, the configuration of the shutter unit 32 will be described with reference to FIGS. 11 to 14 and FIG. These drawings are views showing only the substantially left half as viewed from the subject side in a state where they are incorporated in the camera.

  FIG. 11 shows an overcharge state, that is, a state where the camera is stopped. FIG. 12 shows a standby state before the front curtain and rear curtain travel, and FIG. 13 shows a state where the front curtain and rear curtain travel is completed. The shutter base plate 601 is provided with various components constituting the driving means for the leading blade 602a and the trailing blade 606a (see FIG. 15).

  The shutter base plate 601 has an opening 601a through which a subject light flux passes.

  The leading blade 602a is composed of a plurality of shutter blades (at least one leading blade). The driving means for the front curtain blade 602a includes at least a front curtain drive lever 602, a charge lever 610, a torsion coil spring (not shown), a front curtain armature 603, a front curtain yoke 604, and a front curtain coil 605.

  A front curtain drive lever (drive member) 602 is rotatably supported on a front curtain shaft 601b provided on the surface of the shutter base plate 601. A torsion coil spring (not shown) is disposed on the outer periphery of the front curtain shaft 601b, and this torsion coil spring urges the front curtain drive lever 602 in the clockwise direction in FIG. 11 (direction in which the front curtain blade 602a travels). .

  A front curtain drive pin (not shown) is formed at the front end of the front curtain drive lever 602, and the front curtain drive pin passes through a front curtain groove 601c formed in the shutter base plate 601 and is not shown. Engage with. The front curtain drive arm is connected to the front curtain blade 602a (in a state where the front curtain blade 602a is deployed and driven in FIGS. 11 and 12) via a link mechanism.

  When the front curtain drive pin moves along the front curtain groove 601c by the rotation of the front curtain drive lever 602, the front curtain drive arm rotates to drive the front curtain blade 602a in a superimposed manner or to drive it. By the operation of the front curtain blade 602a, the opening 601a can be opened to allow the subject light flux to pass or can be set to a shielding state in which the subject light flux is substantially blocked. Here, the rotation range of the front curtain drive lever 602 is limited by the front curtain groove 601c.

  The front curtain drive lever 602 is provided with a front curtain armature support portion 602b. A front-curtain armature shaft that is integrally attached to the front-curtain armature 603 has a flange portion that is larger than the inner diameter of the through-hole portion in a through-hole portion (not shown) formed in the front-curtain armature support portion 602b. 603a engages. The front curtain armature shaft 603 a extends in a direction substantially orthogonal to the suction surface of the front curtain armature 603.

  A compression spring (not shown) is disposed between the front curtain armature 603 and the front curtain armature support portion 602b and on the outer periphery of the armature shaft 603a, and separates the front curtain armature 603 and the front curtain armature support portion 602b from each other. Energize in the direction (vertical direction in FIG. 11).

  The front curtain impact absorbing rubber 603b is formed of an elastically deformable shock absorbing member, and is between the front curtain armature support portion 602b and the front curtain armature shaft 603b, and substantially orthogonal to the longitudinal direction of the front curtain armature shaft 603b. It is arranged in the plane. The front-curtain impact absorbing rubber 603b prevents the front-curtain armature support 602b from directly striking the front-curtain armature shaft 603b when shifting from the overcharge state (first state) to the travel start state (second state). The impact applied to the front curtain armature shaft 603b from the front curtain armature support portion 602b is absorbed by elastic deformation.

  A front curtain coil (electromagnetic member) 605 is provided on the outer periphery of the front curtain yoke (electromagnetic member) 604. When a voltage is applied to the front curtain coil 605, a magnetic force can be generated in the front curtain yoke 604, and the front curtain armature 603 can be attracted by this magnetic force.

  The rear curtain blade 606a is composed of a plurality of shutter blades (at least one rear curtain blade). The driving means for the trailing blade 606a includes at least a trailing blade driving lever 606, a charge lever 610, a torsion coil spring (not shown), a trailing blade armature 607, a trailing blade yoke 608, and a trailing blade coil 609.

  A rear curtain drive lever (drive member) 606 is rotatably supported on a rear curtain shaft 601d provided on the surface of the shutter base plate 601. A torsion coil spring is disposed on the outer periphery of the rear curtain shaft 601d, and this torsion coil spring biases the rear curtain drive lever 606 in the clockwise direction in FIG. 11 (the direction in which the rear curtain blade 606a travels).

  A rear curtain drive pin (not shown) is formed at the tip of the rear curtain drive lever 606, and the rear curtain drive pin passes through a front curtain groove 601e formed on the shutter base plate 601 and is not shown. Engage with. The rear curtain drive arm is connected to the rear curtain blade 606a (in a state of being superposed and driven in FIGS. 11 and 12) via a link mechanism.

  When the rear curtain drive pin moves along the rear curtain groove 601e by the rotation of the rear curtain drive lever 606, the rear curtain drive arm rotates to drive the rear curtain blade 606a to be deployed or to be superimposed. By the operation of the rear curtain blade 606a, the opening 601a can be opened to allow the subject light flux to pass or can be set to a shielding state in which the subject light flux is substantially blocked. Here, the rotation range of the trailing curtain drive lever 606 is limited by the trailing curtain groove 601e.

  The rear curtain drive lever 606 is provided with a rear curtain armature support portion 606b. A through-hole portion (not shown) formed in the rear-curtain armature support portion 606b has a flange portion larger than the inner diameter of the through-hole portion, and is attached to the rear-curtain armature 607 integrally. 607a is engaged. The rear curtain armature shaft 607a extends in a direction substantially orthogonal to the suction surface of the rear curtain armature 607.

  A compression spring (not shown) is disposed between the rear curtain armature 607 and the rear curtain armature support portion 606b and on the outer periphery of the rear curtain armature shaft 607a, and the rear curtain armature 607 and the rear curtain armature support portion 606b are connected to each other. Biasing is performed in a direction away from each other (up and down direction in FIG. 11).

  The rear curtain impact absorbing rubber 607b is formed of an elastically deformable impact absorbing member, and is between the rear curtain armature support portion 606b and the rear curtain armature shaft 607b and substantially orthogonal to the longitudinal direction of the rear curtain armature shaft 607b. It is arranged in the plane. The rear-curtain impact absorbing rubber 607b prevents the rear-curtain armature support portion 606b from directly striking the rear-curtain armature shaft 607b when shifting from the overcharge state to the travel start state, and elastically deforms to thereby cause the rear-curtain armature support portion The impact applied to the trailing curtain armature shaft 607b from 606b is absorbed.

  A rear curtain coil (electromagnetic member) 609 is provided on the outer periphery of the rear curtain yoke 608 (electromagnetic member). When a voltage is applied to the rear curtain coil 609, a magnetic force can be generated in the rear curtain yoke 608, and the rear curtain armature 607 can be attracted by this magnetic force.

  The charge lever 610 is rotatably supported by a charge lever shaft 601f provided on the shutter base plate 601. The charge lever 610 is connected to a drive lever member (not shown) via a charge pin 610a, and the drive lever member rotates upon receiving a driving force from a driving source.

  The cam portion 610 b formed on the charge lever 610 contacts the front curtain charge roller 602 c provided on the front curtain drive lever 602 according to the rotation of the charge lever 610 to rotate the front curtain drive lever 602. . Specifically, the cam portion 610b of the charge lever 610 travels by rotating the front curtain drive lever 602 in a state where the travel of the front curtain blade 602a is completed in the counterclockwise direction in FIG. After the pre-standby state, the overcharge state is set.

  The cam portion 610 c formed on the charge lever 610 abuts on the rear curtain charge roller 606 c provided on the rear curtain drive lever 606 according to the rotation of the charge lever 610, and rotates the rear curtain drive lever 606. Move. Specifically, the cam portion 610c of the charge lever 610 travels by rotating the rear curtain drive lever 606 in a state where the travel of the rear curtain blade 606a is completed in the counterclockwise direction in FIG. After the pre-standby state, the overcharge state is set.

  As shown in FIG. 15, a partition member 611 is disposed between the leading blade 602a and the trailing blade 606a. The partition member 611 is formed in a planar shape in which an opening is provided at a substantially central portion for photographing. The cover plate 612 is fixed to the shutter base plate 601 and forms a traveling space for the leading blade 602a and the trailing blade 606a together with the partition member 611. The cover plate 612 is also provided with an opening at a substantially central portion for photographing.

  Next, the operation of the shutter unit 32 when actually shooting is described. When the shutter button 7 is pressed in the overcharge state of FIG. 11, the main mirror 6 and the sub mirror 30 are moved up. In addition, energization of the front curtain coil 605 and the rear curtain coil 609 is started, and the charge lever 610 rotates counterclockwise. Then, the front curtain charge roller 602c and the rear curtain charge roller 606c are separated from the cam portions 610b and 610c of the charge lever 610, and the state shifts to the standby state before traveling in FIG. In the standby state before traveling in FIG. 12, the front curtain armature 603 and the rear curtain armature 607 are electromagnetically attracted and held, so that the front curtain drive lever 602 and the rear curtain drive lever 606 do not rotate.

  Thereafter, the energization of the front curtain coil 605 and the rear curtain coil 609 is sequentially turned off based on an instruction from the MPU 100 having the time interval T1. This time interval T1 corresponds to the shutter time set by the main operation dial 8, as shown in FIG. Then, first, the front curtain drive arm is rotated by the rotation of the front curtain drive lever 602 to drive the front curtain blade 602a in a superimposed manner. Subsequently, the trailing curtain driving arm 606 is rotated by the pivoting of the trailing curtain driving lever 606 to drive the trailing curtain blade 606a to be unfolded, and the exposure operation (photographing operation) is completed, and the traveling completion state shown in FIG.

  Then, the charge lever 610 rotates clockwise, and the cam portions 610b and 610c push the front-curtain charge roller 602c and the rear-curtain charge roller 606c (referred to as a charge operation) to return to the overcharge state of FIG.

  FIG. 16 is a flowchart showing a procedure of processing operations executed by the MPU 100. In FIG. 16, when the main switch 43 is pressed, the MPU 100 turns on the power of the camera body 1 and activates the camera body 1 (step S101). Next, the MPU 100 performs an initial procedure when starting up the camera body 1 (step S102). This initial procedure includes confirmation of abnormality of the power supply voltage level and SW system provided in the camera body 1, confirmation of the presence / absence of a recording medium, confirmation of lens attachment, and initial setting for photographing.

  Next, the MPU 100 executes a foreign matter removing operation (see FIG. 17) described later to remove foreign matter attached to the surface of the infrared cut filter 410 of the imaging unit 400 (step S103). Next, the camera body 1 enters a shooting standby state (step S104).

  Here, the MPU 100 monitors the shutter button 7 provided in the camera body 1, and determines whether or not the shutter button 7 has been pressed (step S105). If the result of this determination is that the shutter button 7 has not been pressed, processing returns to step S104 and the shooting standby state is maintained. On the other hand, when the shutter button 7 is pressed, the process proceeds to step S106, the photographing operation is executed, and this process is terminated.

  FIG. 17 is a flowchart for explaining the foreign substance removal operation executed in step S103 of FIG. In FIG. 17, the MPU 100 controls the shutter drive circuit 103 to start energization of the front curtain coil 605 and the rear curtain coil 609, and the charge lever 610 rotates to move the front curtain and the rear curtain as shown in FIG. A standby state before traveling is set (step S201).

  Next, the MPU 100 controls the piezoelectric element driving circuit 111 to apply the above-described in-phase driving and anti-phase driving periodic voltages to the piezoelectric elements 430a and 430b for a predetermined time. Thereby, the piezoelectric elements 430a and 430b expand and contract according to the periodic voltage of the in-phase driving and the anti-phase driving. Along with this, the infrared cut filter 410 performs bending vibration, and removes foreign matter adhering to the surface of the infrared cut filter 410 (step S202).

  As a result of this foreign matter removing operation, as shown in FIG. 15A, when the foreign matter 900 is attached to the surface of the infrared cut filter 410, the following occurs. That is, as shown in FIG. 15B, the foreign material 900 attached to the surface of the infrared cut filter 410 is peeled off from the infrared cut filter 410 by the acceleration generated in the direction perpendicular to the surface due to the vibration of the infrared cut filter 410. , Fly forward.

  At that time, the foreign matter adhering to the portion having a large amplitude has a large acceleration, and is scattered far away from the infrared cut filter 410 and falls by gravity near the infrared cut filter 410. When the foreign matter freely falls from the infrared cut filter 410, it is affected by the fluctuation of the fall caused by the asymmetry of the shape of the foreign matter, the minute convection near the infrared cut filter 410, the posture of the camera body 1, and the like. Then, the foreign material 900 may reattach to the infrared cut filter 410 by touching the infrared cut filter 410 during the fall. In addition, when scattered far from the infrared cut filter 410, it may adhere to the blade surface of the leading blade 602 a of the shutter unit 32 disposed in front of the infrared cut filter 410.

  On the other hand, the foreign matter that has fallen downward without adhering to the infrared cut filter 410 or the leading blade 602a is collected by an adsorbent (not shown) disposed near the opening of the main body chassis 300 or below the imaging unit 400. The Thereby, it can prevent floating and reattaching to the infrared cut filter 410.

  After removing the foreign matter in step S202, the MPU 100 turns off the energization of the trailing curtain coil 609 via the shutter driving circuit 103, and the unfolding drive of the trailing curtain blade 606a of the shutter unit 32 as shown in FIG. (Running) is performed (step S203). FIG. 18 illustrates a standby state before the front curtain travel and a rear curtain travel completion state in which the rear curtain coil 609 is turned off and the rear curtain blade 606a is traveled from the standby state before travel of FIG.

  At this time, the leading blade 602a vibrates in a direction perpendicular to the surface by the wind pressure during the traveling of the trailing blade 606a. That is, the foreign matter scattered from the infrared cut filter 410 and attached to the blade surface of the leading blade 602a is peeled off from the blade surface of the leading blade 602a and scattered downward as shown in FIG. .

  Further, the partition member 611 vibrates due to the impact caused by the completion of the travel of the trailing blade 606a, and thereby the leading blade 602a vibrates in a direction perpendicular to the surface. That is, the foreign matter scattered from the infrared cut filter 410 and adhering to the blade surface of the leading blade 602a is peeled off from the blade surface of the leading blade 602a and scattered downward as shown in FIG. .

  Here, in FIGS. 15C and 15D, the foreign object 900 falls into the gap between the infrared cut filter 410 and the shutter unit 32. As a result, as shown in FIG. 15D, the foreign matter adhering to the surface of the leading blade 602a is reliably removed.

  In step S203, after the trailing blade 606a is driven to expand, the trailing blade 606a is charged (step S204), and the trailing blade 606a and the leading blade 602a return to the overcharge state (FIG. 11). This process ends.

  As described above, according to the present embodiment, the rear-cut blade 606a is driven to spread after the infrared cut filter 410 is vibrated in the shielded state of the front-curtain blade 602a, so that the accuracy of the shutter operation is not affected. Efficient foreign matter removal can be performed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 19 is a flowchart showing the procedure of the foreign substance removal operation in the second embodiment. The flowchart of FIG. 19 is executed in step S103 of FIG. 16 instead of the flowchart of FIG. 17 in the first embodiment. Other processes are the same as those described in the first embodiment. FIG. 20 is a conceptual diagram of foreign matter removal in the foreign matter removal operation according to the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 19, the MPU 100 controls the shutter drive circuit 103 to start energizing the front curtain coil 605 and the rear curtain coil 609, and the charge lever 610 rotates to move the front curtain and rear curtain as shown in FIG. A standby state before traveling is set (step S211).

  Next, the MPU 100 controls the piezoelectric element driving circuit 111 to apply the aforementioned in-phase driving and anti-phase driving periodic voltages to the piezoelectric elements 430a and 430b for a predetermined time. Thereby, the piezoelectric elements 430a and 430b expand and contract according to the periodic voltage of the in-phase driving and the anti-phase driving. Along with this, the infrared cut filter 410 bends and removes foreign matter adhering to the surface of the infrared cut filter 410 (step S212).

  As a result of this foreign matter removing operation, as shown in FIG. 15A, when the foreign matter 900 has adhered to the surface of the infrared cut filter 410, the following occurs. That is, as shown in FIG. 20, the foreign material 900 adhering to the surface of the infrared cut filter 410 is peeled off from the infrared cut filter 410 by the acceleration generated in the direction perpendicular to the surface due to the vibration of the infrared cut filter 410 and moved forward. Scatter.

  At substantially the same time as step S212, the MPU 100 turns off the energization of the trailing curtain coil 609 via the shutter driving circuit 103, and, as shown in FIG. Is performed (step S213). At this time, the leading blade 602a vibrates in a direction perpendicular to the surface by the wind pressure during the traveling of the trailing blade 606a. Further, the partition member 611 vibrates due to the impact caused by the completion of the travel of the trailing blade 606a, and thereby the leading blade 602a vibrates in a direction perpendicular to the surface. That is, some of the foreign matter scattered from the infrared cut filter 410 comes into contact with the blade surface of the leading blade 602a. However, since the leading blade 602a vibrates, it is bounced back as shown in FIG. Splash in the direction.

  In step S213, the trailing blade 606a is driven to expand, and then the trailing blade 606a is charged (step S214). The trailing blade 606a and the leading blade 602a return to the overcharged state (FIG. 11).

  In step S212, foreign matter removal is performed for a predetermined time. At the same time, the unfolding drive and charging operation of the trailing blade 606a are performed in steps S213 and S214.

  According to the second embodiment, since the rear curtain blade 606a is driven to expand while the infrared cut filter 410 is vibrated while the front curtain blade 602a is shielded, the same effect as that of the first embodiment is achieved. In addition, the time for the foreign substance removal operation can be further shortened.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 21 is a flowchart showing the procedure of the foreign matter removing operation in the third embodiment. The flowchart of FIG. 21 is executed in step S103 of FIG. 16 instead of the flowchart of FIG. 17 in the first embodiment. Other processes are the same as those described in the first embodiment. FIG. 20 is a conceptual diagram of foreign matter removal in the foreign matter removal operation according to the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 21, the MPU 100 controls the shutter drive circuit 103 to start energization of the front curtain coil 605 and the rear curtain coil 609, and the charge lever 610 rotates to move the front curtain and the rear curtain as shown in FIG. A standby state before traveling is set (step S221).

  Next, the MPU 100 controls the piezoelectric element driving circuit 111 to apply the aforementioned in-phase driving and anti-phase driving periodic voltages to the piezoelectric elements 430a and 430b for a predetermined time. Thereby, the piezoelectric elements 430a and 430b expand and contract according to the periodic voltage of the in-phase driving and the anti-phase driving. Along with this, the infrared cut filter 410 bends and removes foreign matter adhering to the surface of the infrared cut filter 410 (step S222).

  As a result of this foreign matter removing operation, as shown in FIG. 15A, when the foreign matter 900 has adhered to the surface of the infrared cut filter 410, the following occurs. That is, as shown in FIG. 15B, the foreign matter 900 adhering to the surface of the infrared cut filter 410 is peeled off from the infrared cut filter 410 by the acceleration generated in the direction perpendicular to the surface by the vibration of the infrared cut filter 410, Splash forward.

  After removing the foreign matter in step S222, the MPU 100 turns off the energization of the trailing curtain coil 609 via the shutter driving circuit 103, and as shown in FIG. 18, the driving for unfolding the trailing curtain blade 606a of the shutter unit 32 is performed. (Running) is performed (step S223).

  At this time, the leading blade 602a vibrates in a direction perpendicular to the surface by the wind pressure during the traveling of the trailing blade 606a. That is, the foreign matter scattered from the infrared cut filter 410 and attached to the blade surface of the leading blade 602a is peeled off from the blade surface of the leading blade 602a and scattered downward as shown in FIG. .

  Further, the partition member 611 vibrates due to the impact caused by the completion of the travel of the trailing blade 606a, and thereby the leading blade 602a vibrates in a direction perpendicular to the surface. That is, the foreign matter scattered from the infrared cut filter 410 and adhering to the blade surface of the leading blade 602a is peeled off from the blade surface of the leading blade 602a and scattered downward as shown in FIG. .

  Here, in FIGS. 15C and 15D, the foreign object 900 falls into the gap between the infrared cut filter 410 and the shutter unit 32. As a result, as shown in FIG. 15D, the foreign matter adhering to the surface of the leading blade 602a is reliably removed.

  After the rear curtain blade 606a is deployed in step S223, it is determined whether a predetermined time has elapsed since the rear curtain blade 606a is deployed (step S224). As this predetermined time, a sufficient time is set until the foreign object 900 is blown from the uppermost end of the leading blade 602a and passes through the lower side of the opening. Accordingly, it is possible to prevent foreign matter 900 from entering the front curtain blade 602a when the front curtain blade 602a travels in step S225 described later. If the predetermined time has elapsed in step S224, the process proceeds to step S225, and if the predetermined time has not elapsed, the process returns to step S224.

  After a predetermined time has elapsed, the MPU 100 turns off the energization of the front curtain coil 605 via the shutter drive circuit 103, and performs superimposed driving (running) of the front curtain blade 602a of the shutter unit 32 as shown in FIG. 13 (step) S225). As a result, the number of travels of the trailing blade 606a and the leading blade 602a is the same.

  After superimposing driving of the leading blade 602a in step S225, the trailing blade 606a and the leading blade 602a are charged (step S226), and the trailing blade 606a and the leading blade 602a are overcharged (see FIG. Returning to 11), this processing is terminated.

  According to the third embodiment, the same effect as that of the first embodiment can be obtained. Further, since the traveling speed of the blade group of the shutter unit 32 varies depending on the number of times of traveling, it is desirable that the number of traveling times of the trailing blade 606a and the leading blade 602a be the same. In the third embodiment, since the number of travels of the trailing blade 606a and the leading blade 602a can be made the same, the accuracy of the shutter operation can be stabilized.

(Fourth embodiment)
With reference to FIG. 22, another form of the shutter unit (mechanical focal plane shutter) 32 will be described. The camera of this embodiment is the same as that described in the camera of the above-described embodiment, and the same reference numerals are given to the same configurations as those of the first embodiment, and the description thereof is omitted.

  The partition member 611 ′ is formed by bending a part of the lower side substantially in the optical axis direction so as to collide with the trailing curtain blade 606 a that travels. The bent portion 613 functions as a collision portion according to the present invention. When the trailing blade 606a travels, the trailing blade 606a collides with the bent portion of the partition member 611 ′, and the partition member 611 ′ is large. Generates vibration. The vibration of the partition member 611 ′ directly impacts the front curtain blade 602a, and the front curtain blade 602a vibrates in a direction perpendicular to the surface. That is, the foreign matter scattered from the infrared cut filter 410 and attached to the blade surface of the leading blade 602a is peeled off from the blade surface of the leading blade 602a and scattered downward as shown in FIG.

  According to the fourth embodiment, since the partition member that directly transmits the impact at the time when the trailing blade is completed traveling to the leading blade is provided, it is possible to efficiently remove foreign matter.

  As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention. In the above embodiment, the example in which the foreign substance removal process is executed when the camera body 1 is activated has been described. However, the present invention is not limited to this, and is configured to execute the foreign substance removal process by a user operation, for example. It may be.

  Moreover, in the said embodiment, although it was set as the structure which complete | finishes a process by running a blade | wing once after foreign substance removal or during foreign substance removal, this invention is not limited to this. For example, the blade may be configured to travel a plurality of times after removing the foreign matter or during the removal of the foreign matter, or configured to further remove the foreign matter after the blade has been traveled at least once after the removal of the foreign matter. Also good.

  Furthermore, in the said embodiment, although it was set as the structure which excites bending vibration to the infrared cut filter 410, this invention is not limited to this. That is, as the optical member arranged on the photographing optical axis in the present invention, an optical low-pass filter, a birefringent plate or a single phase plate formed by bonding a birefringent plate, a phase plate and an infrared cut filter is used. Further, it may be configured to excite bending vibrations.

  The object of the present invention can also be achieved by supplying a storage medium storing software program codes for realizing the functions of the above-described embodiments to a system or apparatus. In this case, the computer (or CPU or MPU) of the system or apparatus reads and executes the program code stored in the storage medium.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  Further, the functions of the above-described embodiments are not limited to being realized by executing the program code read by the computer. For example, an OS (basic system or operating system) running on the computer performs part or all of the actual processing based on an instruction of the program code, and the functions of the above-described embodiments are realized by the processing. May be.

  Further, the program code read from the storage medium may be written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. In this case, after being written in the memory, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instruction of the program code, and the function of the above-described embodiment is performed by the processing. Is realized.

1 is a front perspective view of a digital single-lens reflex camera according to an embodiment of the present invention. It is a back side perspective view of the digital single-lens reflex camera which concerns on embodiment of this invention. 1 is a block diagram showing an electrical configuration of a digital single-lens reflex camera according to an embodiment of the present invention. It is a disassembled perspective view which shows schematic structure inside the camera for demonstrating the periphery structure of an imaging unit. It is a disassembled perspective view which shows the structure of an imaging unit. It is the perspective view seen from the photographer side which shows a vibration unit structure. It is a partial cross section figure which follows the XX line of FIG. It is a figure for demonstrating a piezoelectric element. It is a side view showing a vibration shape when an infrared cut filter vibrates in a mode having 20 nodes. It is a side view which shows a vibration shape when an infrared cut filter vibrates in the mode with 19 nodes. It is a figure which shows the overcharge state of a shutter unit. It is a figure which shows the standby state before the front curtain rear curtain driving | running | working of a shutter unit. It is a figure which shows the front curtain rear curtain driving | running completion state of a shutter unit. It is a voltage control time chart of a shutter unit. It is a figure for demonstrating operation | movement of the shutter unit at the time of the foreign material removal operation | movement in 1st Embodiment. It is a flowchart which shows the procedure of the processing operation performed by MPU. It is a flowchart which shows the procedure of the foreign material removal operation | movement in 1st Embodiment. It is a figure which shows the standby state before the front curtain travel of the shutter unit, and the rear curtain travel completion state. It is a flowchart which shows the procedure of the foreign material removal operation | movement in 2nd Embodiment. It is a figure for demonstrating operation | movement of the shutter unit at the time of the foreign material removal operation | movement in 2nd Embodiment. It is a flowchart which shows the procedure of the foreign material removal operation | movement in 3rd Embodiment. It is a figure for demonstrating operation | movement of the shutter unit at the time of the foreign material removal operation | movement in 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera body 2 Mount 5 Mirror box 19 Color liquid crystal monitor 32 Focal plane shutter unit 33 Image pick-up element 44 Cleaning instruction | indication operation member 100 Microcomputer (MPU)
300 Main body chassis 400 Imaging unit 410 Infrared cut filter 430a Piezoelectric element 430b Piezoelectric element 450 Elastic member 460 Holding member 470 Vibration unit 500 Imaging element unit 510 Imaging element holding member 601 Shutter base plate 602 Front curtain drive lever 602a Front curtain blade 606a Rear curtain blade 611 Partition member 612 Cover plate 613 Bending part

Claims (5)

An image sensor that converts an optical image of a subject into an electrical signal;
An optical member disposed in front of the image sensor and on the photographing optical axis;
Excitation means for applying vibration to the optical member;
At least one front curtain blade that is disposed in front of the optical member and travels from the open state to the open state during exposure, and at least one rear curtain that travels from the open state to the open state during exposure. Superimposing drive for moving the blade and the leading blade from the open state to the open state, unfolding drive for opening the open state from the open state, and unfolding drive for bringing the rear curtain blade from the open state to the open state And a shutter device comprising a driving means for performing superimposed driving from the shielding state of the opening to the open state;
Control means for controlling the excitation means and the drive means so as to drive the rear curtain blade in a deployed manner after the optical member is vibrated in the shielded state of the front curtain blade or in a state where the optical member is vibrated. An imaging apparatus comprising:   The imaging apparatus according to claim 1, wherein the control unit performs superimposition driving after the rear curtain blade is driven to spread.   The control means vibrates the optical member in the shielded state of the front curtain blade, and then drives the front curtain blade in a superimposed manner after a predetermined time has elapsed since the rear curtain blade is driven to expand and the opening is shielded. The imaging apparatus according to claim 1.   The imaging apparatus according to claim 3, wherein the predetermined time is a time sufficient for foreign matter scattered from an upper end of the leading blade to pass through a lower side of the opening.   The shutter device includes a partition member disposed between the front curtain blade and the rear curtain blade, and the partition member has a collision portion that collides when the rear curtain blade is driven to expand. The imaging device according to any one of claims 1 to 4.

Images