JP2009159479A - Imaging apparatus and vibration control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus for adding vibration to automatically and effectively drop an attached foreign substance, such as dust, with respect to a focusing plate and an optical member having different materials and surface states. <P>SOLUTION: A camera control unit 306 controls a piezoelectric device driving part 301 to generate periodic voltage for driving piezoelectric devices 15 and 110a. When the upright position of a camera body 101 is detected by an attitude detection sensor 310, voltage is applied to the piezoelectric device 15 of the focusing plate 10 prior to the piezoelectric device 110a of an optical low pass filter 110. On the other hand, when the upside-down posture of the camera body 101 is detected, voltage is applied to the piezoelectric device 110a of the optical low pass filter 110 prior to the piezoelectric device 15 of the focusing plate 10. The focusing plate 10 performs normal vibration vibrating relatively in the same direction as a photographing optical axis 1 to a mirror box. On the other hand, the optical low pass filter 110 performs higher-order bending standing wave vibration having a vibration amplitude in the same direction as the photographing optical axis 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an imaging apparatus that removes foreign matters such as dust attached to the surface of an optical member and the like, and an excitation control method thereof.

  An imaging apparatus such as a digital single-lens reflex camera that captures an object image by converting it into an electrical signal branches a photographing light beam by a mirror disposed in a mirror box and forms it on a focusing plate. The photographer performs a photographing operation while observing an image formed on the focus plate with a finder optical system. As a result of the shooting operation, the imaging device receives the imaging light flux by the imaging device, converts a photoelectric conversion signal output from the imaging device into image data, and records the image data on a recording medium such as a memory card.

  In such an imaging apparatus, an optical low-pass filter and an infrared absorption filter are disposed on the subject side of the imaging element. If foreign matter such as dust adheres to the surface of these filters, the attached portion becomes a black dot and appears in the photographed image, and the appearance of the image deteriorates.

  Further, when foreign matter such as dust adheres to the focus plate, the attached portion overlaps the subject image, and the appearance of the observation image is deteriorated. In particular, in a digital single-lens reflex camera with interchangeable lenses, a mechanical operation unit such as a shutter and a quick return mirror is disposed in the vicinity of the image sensor and the focus plate. Foreign matter such as dust generated from these operating parts may adhere to the surfaces of the image sensor, filter, and focus plate. In addition, when exchanging the lens, foreign matter such as dust may enter the camera body from the opening of the lens mount and adhere to it.

In order to avoid such a phenomenon, Patent Document 1 proposes a technique for automatically removing foreign matters such as dust attached to the surface by attaching a piezoelectric element to an optical low-pass filter and vibrating it. Yes. On the other hand, when a foreign substance such as dust adheres to the focus plate, an operation of blowing off with a blower has been conventionally performed.
JP 2007-129642 A

  However, as described above, a technique for removing dust and the like adhering to the image sensor side has been proposed, but a technique for automatically removing dust and the like attached to the focus plate side has not been proposed. For this reason, the photographer is forced to perform removal work with a blower or the like, and if there is no blower, it is difficult to remove dust and the like, and the photographer feels unsightly.

  Also, even if there is a blower, it is mostly the case that the taking lens is attached to notice that dust etc. is attached to the focus plate, so if you do not remove the taking lens one by one, you will remove it I couldn't do it, and I felt annoying.

  Therefore, the present invention provides an imaging apparatus and an excitation control method for the imaging apparatus capable of giving vibrations for automatically and effectively dropping foreign matter such as attached dust to each of a focusing plate and an optical member having different materials and surface states. The purpose is to provide.

  In order to achieve the above object, an image pickup apparatus according to the present invention includes an image pickup device that converts an optical image of a subject into an electrical signal, an optical member that is disposed in front of the image pickup device and is located on a photographing optical axis, and the subject. An imaging device comprising: a focusing plate provided in a finder optical system for observing the light; and reflecting means disposed on the photographic optical axis and configured to reflect the light of the subject and guide the light to the finder optical system, First vibration means for vibrating the optical member, second vibration means for vibrating the focusing plate in a vibration mode different from the vibration mode of the first vibration means, and the first vibration means. A driving means for driving the vibration means and the second vibration means, and a control means for controlling the driving means are provided.

  According to the vibration control method of the image pickup apparatus of the present invention, an image pickup device that converts an optical image of a subject into an electrical signal, an optical member that is disposed in front of the image pickup device and is disposed on a photographing optical axis, and the subject is observed. An excitation control method for an imaging apparatus, comprising: a focusing plate provided in a finder optical system for detecting the light, and reflecting means arranged on the photographic optical axis to reflect the light of the subject and guide the light to the finder optical system. The focus plate has a vibration mode different from a vibration mode of the first vibration unit by the first vibration unit and the second vibration unit. And a control step for controlling the drive means for driving the first and second vibration means by the control means.

  According to the imaging apparatus according to the present invention, the vibration form of the focus plate and the optical member are different, so that foreign substances such as dust attached to the focus plate and the optical member having different materials and surface states are automatically and effectively removed. The vibration to drop can be given.

  DESCRIPTION OF EMBODIMENTS Embodiments of an imaging apparatus and an excitation control method thereof according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a central sectional view showing the structure of a digital single-lens reflex camera according to the first embodiment. In FIG. 1, an interchangeable lens 201 detachably attached to the camera body 101 is fixed by a camera-side mount portion 102 and an interchangeable lens-side mount portion 202. When the interchangeable lens 201 is attached, the contact portion 103 of the camera body 101 and the contact portion 203 of the interchangeable lens 201 come into contact with each other. Thereby, electrical connection is made, and the camera body 101 detects that the interchangeable lens 201 is attached. Further, the power supply from the camera body 101 to the interchangeable lens 201 and the communication for controlling the interchangeable lens 201 are performed via the contact portion 103 and the contact portion 203.

  The light beam that has passed through the photographing lens 204 of the interchangeable lens 201 enters the main mirror 104 of the camera body 101. The main mirror 104 (corresponding to the reflecting means) is a half mirror, and the light beam reflected by the main mirror 104 is guided to the finder side, and the transmitted light beam is reflected downward by the sub mirror 105, and the focus detection unit. 106.

  The focus detection unit 106 detects the defocus amount of the photographing lens 204 and calculates the driving amount of the photographing lens 204 for bringing the photographing lens 204 into a focused state. When the driving amount is transmitted to the interchangeable lens 201 via the contact portion 103 and the contact portion 203, the interchangeable lens 201 controls a motor (not shown) to move the focus lens that is a part of the photographing lens 204. Adjust the focus.

  The main mirror 104 is fixed to the main mirror holding frame 107 and is pivotally supported by a hinge shaft 108 so as to be rotatable. The sub mirror 105 is fixed to a sub mirror holding frame 109, and the sub mirror holding frame 109 is pivotally supported with respect to the main mirror holding frame 107 by a hinge shaft (not shown).

  The light beam guided to the viewfinder side by the main mirror 104 forms an image of the subject on the focus plate 10. The focus plate 10 is fixed to an instruction frame 17 provided in a metal frame 13 held between a rubber member 14 (subject side) and a piezoelectric element 15 (image sensor side) (see FIG. 3). The finder optical system is configured so that the photographer can observe the subject image on the focusing screen 10 via the pentaprism 11 and the eyepiece 12.

  Further, a shutter 113 is disposed behind the sub mirror 105, and the shutter curtain 114 constituting the shutter 113 is normally closed. An optical low-pass filter 110 is disposed behind the shutter 113. Further, behind the optical low-pass filter 110, an image sensor 116 held by the image sensor holder 115 and a cover member (protective member) 117 that protects the image sensor 116 are disposed.

  The rubber member (elastic member) 111 is a rubber member for holding the optical low-pass filter 110 and sealing between the optical low-pass filter 110 and the image sensor 116. Thereby, the vibration transmitted to the surroundings is attenuated without impeding the vibration of the optical low-pass filter 110, and foreign matter is prevented from entering the image sensor 116. At the time of shooting, the light beam that has passed through the optical low-pass filter 110 enters the image sensor 116. Further, the rubber member 111 is not limited to rubber, and may be elastic such as sponge, gel-like substance, double-sided tape having a predetermined thickness.

  The operation unit 32 can set the camera body 101 to the cleaning mode in order to remove foreign matters attached to the focus plate 10 and the optical low-pass filter 110.

  FIG. 2 is a block diagram showing an electrical configuration of the digital single-lens reflex camera. In FIG. 2, an interchangeable lens 201 is for forming a subject image (an optical image of the subject). A diaphragm 122 is provided in the interchangeable lens 201 and is used to adjust the amount of light incident on the image sensor 116. The image sensor 116 is for photoelectric conversion of a subject image.

  The light beam that has passed through the photographing lens 204 of the interchangeable lens 201 enters the main mirror 104 of the camera body 101. The main mirror 104 is a half mirror as described above. The light beam reflected by the main mirror 104 forms a subject image on the focus plate 10 held between the rubber member 14 (subject side) and the piezoelectric element 15 (imaging element side). The photographer can observe the subject image with the viewfinder optical system. Here, the piezoelectric element 15 corresponds to a second vibration means.

  The optical low-pass filter 110 is disposed in close proximity to the front surface of the image sensor 116, and when a foreign object adheres to the surface of the optical low-pass filter 110, it becomes a shadow and appears in the subject image on the image sensor 116. On the surface of the optical low-pass filter 110, a piezoelectric element 110a that vibrates the optical low-pass filter 110 and removes attached foreign matter is disposed. A piezoelectric element driving unit 301 for driving the piezoelectric element 110a is connected to the piezoelectric element 15 on the focus plate 10 side and the piezoelectric element 110a on the optical low-pass filter 110 side. Here, the piezoelectric element 110a corresponds to a first vibration means.

  The A / D converter 302 converts the analog image signal output from the image sensor 116 into a digital image signal. The image processing device 303 processes the digital image signal output from the A / D converter 302. The lens system control unit 304 controls the lens position of the interchangeable lens 201 and the aperture of the diaphragm. The various sensors 305 are an AF (autofocus) sensor, an AE (automatic exposure) sensor, and the like. The posture detection sensor 310 detects the posture of the camera body 101.

  Further, the camera control unit 306 controls the operation of the entire digital single lens reflex camera. An I / O 307 is an input / output interface with a shutter button, a shooting mode selection dial, an operation unit 32, and the like. The external display unit 308 displays settings of the camera body 101, information, captured images, and the like. The memory 309 stores captured images and various information.

  User operations are acquired via the I / O 307, and power ON / OFF, shooting operations, and the like are performed according to user operations. When a shooting operation is instructed, the camera control unit 306 determines appropriate shooting conditions based on information obtained from the various sensors 305 and the image sensor 116, and sets an appropriate lens position and the like via the lens system control unit 304. To do. After the exposure, the output signal of the image sensor 116 is digitized via the A / D converter 302, and then the camera control unit 306 performs appropriate image processing with the image processing device 303 and stores it in the memory 309. If necessary, the camera control unit 306 displays the output signal of the image sensor 116 on the external display 308. The image processing apparatus 303 performs processing such as white balance adjustment, RGB development, and compression encoding.

  Next, the configuration of the foreign matter removing portion of the focus plate 10 will be described in detail. FIG. 3 is a diagram showing the configuration of the focus plate unit. FIG. 4B is a plan view of the focus plate unit. The figure (a) is the arrow AA sectional view taken on the line in the figure (b).

  Unlike the optical low-pass filter 110, the focus plate 10 is generally made of a plastic mold, and has an irregular surface such as a Fresnel shape on its surface. For this reason, as in the optical low-pass filter 110, even if the piezoelectric element is directly attached to the focus plate and vibrated by the same drive circuit as the optical low-pass filter, it cannot be vibrated effectively.

  Therefore, in the present embodiment, the focusing plate 10 is assembled to a metal frame 13 (corresponding to a frame) made of a material having a relatively large specific gravity such as copper or iron, provided on the outer periphery of the focusing plate 10, A focus plate unit is formed. Then, the rubber member 14 (subject side) and the piezoelectric element 15 (imaging element side) are fixed on both sides so as to sandwich the metal frame 13, and the focusing plate unit is fixed in the mirror box. By doing so, the focusing plate can be handled like a rigid body, and vibration can be applied by the same drive circuit as the optical low-pass filter 110.

  Here, when the focus plate 10 is vibrated, if a voltage is applied to the piezoelectric element 15, the piezoelectric element 15 expands and contracts in the same direction as the photographing optical axis 1, and the metal frame 13 is displaced relative to the mirror box. Let At this time, the focus plate 10 assembled integrally with the metal frame 13 vibrates integrally with the metal frame 13 in a direction orthogonal to the viewfinder optical axis 1a (see FIG. 1). Thereby, the foreign material adhering to the surface of the focus board 10 can be screened off.

  Next, the configuration of the foreign matter removing unit of the optical low-pass filter 110 will be described in detail. FIG. 4 is an exploded perspective view showing the configuration of the imaging unit.

  The piezoelectric element 110a has a single plate rectangle (strip shape). In the peripheral portion 110 b of the optical low-pass filter 110, the piezoelectric element 110 a is disposed so that its long side is parallel to the short side (side) of the optical low-pass filter 110, and is fixed to the optical low-pass filter 110. The piezoelectric element 110a serves as a vibration source for vibrating the optical member. In other words, the piezoelectric element 110a is fixed in close proximity to one of the four sides of the optical low-pass filter 110, and vibrates the optical low-pass filter 110 in a wave shape so as to have a plurality of nodes parallel to the one side.

  The optical low-pass filter holding member 117 is made of resin or metal, holds the optical low-pass filter 110, and is fixed to the image sensor holder 115 with screws. The piezoelectric element flexible printed circuit board 121 is for applying a voltage to the piezoelectric element 110a, and is fixed to the piezoelectric element 110a by bonding. The piezoelectric element 110a expands and contracts in a direction orthogonal to the optical axis by applying a voltage, and resonates the optical low-pass filter 110. Thereby, the foreign material adhering to the surface of the optical low-pass filter 110 can be screened out.

  The urging members 118 are in contact with each other at four positions in the imaging effective area 110 c of the optical low-pass filter 110, urge the optical low-pass filter 110 in the optical axis direction, and are locked to the optical low-pass filter holding member 117. Further, since the surface of the optical low-pass filter 110 (surface coated with an optical coating) is connected to the ground via the biasing member 118, the generation of static electricity is suppressed, dust or the like on the optical low-pass filter 110, and the like. Can be suppressed.

  The elastic member 111 has a frame shape with a substantially circular cross section, and is sandwiched between the optical low-pass filter 110 and the optical low-pass filter holding member 117 and held in close contact therewith. The material of the elastic member 111 may be rubber as in the present embodiment, or may be a material using a polymer such as poron or plastic as long as it is an elastic body.

  The infrared cut filter 123 is a filter for cutting harmful infrared light, and is fixed to the optical low-pass filter holding member 117 by adhesion.

  The imaging element holder 115 is a plate having a rectangular opening, and the imaging element 116 is fixed so that the imaging element 116 is exposed from the opening. At the periphery of the image sensor holder 115, there are provided arm portions 115a for fixing the image sensor holder 115 to the mirror box with three screws.

  The mask 119 is for preventing extra light from entering the imaging optical path from entering the image sensor 116, and is sandwiched between the optical low-pass filter holding member 117 and the image sensor 116 and is held in close contact. The imaging element urging member 120 has a pair of left and right leaf springs, is fixed to the imaging element holder 115 with screws, and presses the imaging element 116 against the imaging element holder 115. By adopting such a configuration, the optical low-pass filter 110 is sandwiched between the urging member 118 and the elastic member 111 and is supported so as to freely vibrate.

  In the digital single-lens reflex camera having the above-described configuration, the operation of removing foreign matter between the focus plate 10 and the optical low-pass filter 110 is shown. FIG. 5 is a flowchart showing an operation procedure for removing foreign matter between the focusing plate 10 and the optical low-pass filter 110. This processing program is stored in the ROM in the camera control unit 306, and is executed at a predetermined cycle by the CPU in the camera control unit 306.

  The camera control unit 306 in the camera body 101 determines whether or not the operation unit 32 has been operated by the user (step S1). When it is determined that the operation unit 32 has not been operated by the user, the camera control unit 306 ends this operation.

  On the other hand, when the operation unit 32 is operated in step S1, the camera control unit 306 receives a cleaning mode command signal from the operation unit 32 via the I / O 307 and shifts to the cleaning mode (step S2). In the cleaning mode, the camera control unit 306 controls the piezoelectric element driving unit 301 to generate a periodic voltage for driving the piezoelectric element 15 and the piezoelectric element 110a.

  The camera control unit 306 detects a signal from the posture detection sensor 310 (step S3), and determines the posture of the camera body 101 from this signal (step S4). When the posture detection sensor 310 outputs a signal indicating that the camera body 101 is in the normal position, the camera control unit 306 causes the piezoelectric element driving unit 301 to drive the piezoelectric element 15 of the focusing plate 10 with priority. Control (step S5). That is, the camera control unit 306 controls the piezoelectric element driving unit 301 so that the voltage is applied to the piezoelectric element 15 of the focusing plate 10 before the piezoelectric element 110a of the optical low-pass filter 110. Here, the normal position of the camera body 101 is a posture in which foreign matter attached to the focus plate 10 is likely to fall, which is effective in removing foreign matter from the focus plate. Thereafter, the camera control unit 306 ends this operation.

  When the posture detection sensor 310 outputs a signal indicating that the camera body 101 is facing downward, the camera control unit 306 causes the piezoelectric element driving unit to drive the piezoelectric element 110a of the optical low-pass filter 110 with priority. 301 is controlled (step S6). That is, the camera control unit 306 controls the piezoelectric element driving unit 301 so that a voltage is applied to the piezoelectric element 110 a of the optical low-pass filter 110 before the piezoelectric element 15 of the focusing plate 10. Here, the downward direction of the camera body 101 is a posture in which foreign matter attached to the optical low-pass filter 110 is likely to fall, which is effective in removing foreign matter from the optical low-pass filter. Thereafter, the camera control unit 306 ends this operation. As described above, when removing the foreign matter from the focusing plate and the optical low-pass filter whose surfaces are orthogonal to each other, it is possible to effectively control according to the posture of the camera body. In this embodiment, the timing for driving the piezoelectric element 15 of the focus plate 10 and the piezoelectric element 110a of the optical low-pass filter 110 is changed according to the posture of the camera body 101, but the applied periodic voltage is also changed. Thus, the vibration intensity may be changed.

  When the posture detection sensor 310 outputs a signal indicating that the camera body 101 is in a position other than the normal position or downward, the camera control unit 306 exits the cleaning mode and controls the piezoelectric element driving unit 301. Is stopped (step S7). Thereby, the application of the voltage to the piezoelectric elements 15 and 110a by the piezoelectric element driving unit 301 is stopped. Further, at this time, the camera control unit 306 performs a warning display regarding the posture state and a display for instructing to change the posture of the camera body 101 to the normal position or the downward direction on the external display unit 308. This is because any posture other than the normal position or downward direction of the camera body 101 is not effective in removing foreign matter. In this way, the photographer can be informed of an effective posture for removing foreign matter from the focus plate and the optical low-pass filter.

  In accordance with this instruction, the camera control unit 306 waits for the user to change the camera body 101 to the normal position or downward (step S8). When the posture detection sensor 310 detects that the position has been changed to the normal position or downward, the camera control unit 306 instructs the external display unit 308 to operate the operation unit 32 to return to the cleaning mode. Is performed (step S9). Thereafter, the camera control unit 306 ends this operation.

  When the user operates the operation unit 32 in accordance with this instruction, the camera control unit 306 performs the above-described processing in steps S1 and S2, again moves to the cleaning mode, and performs control according to the posture.

  Here, as described above, the vibration forms for removing foreign matter on the focus plate 10 and the optical low-pass filter 110 differ depending on the respective structures. That is, the focus plate 10 performs steady vibration that vibrates in the same direction as the photographing optical axis 1 relative to the mirror box integrally with the metal frame 13. In addition, you may make it perform bending vibration that the external shape of the focusing board 10 changes instead of steady vibration. On the other hand, the optical low-pass filter 110 performs higher-order bending standing wave vibration having vibration amplitude in the same direction as the photographing optical axis 1. Instead of standing wave vibration, traveling wave vibration in which a wave travels in a certain direction may be performed.

  In addition, when vibrating the focus plate 10 and the optical low-pass filter 110, it is preferable to select a resonance frequency that is outside the audible range in order to suppress generation of unpleasant sound.

  According to the digital single-lens reflex camera of the first embodiment, since the focus plate and the optical low-pass filter have different vibration forms, foreign matter such as dust adhered to the focus plate and the optical low-pass filter having different materials and surface states. The vibration which drops effectively automatically can be given.

  In addition, a dedicated circuit for exciting the focus plate is not required, and an increase in cost can be prevented. Also, when a focus plate made of soft plastic mold and having irregularities such as Fresnel shape on the surface is vibrated with the same drive circuit as a flat optical low-pass filter made of hard glass, foreign matter adhered to each The vibration which drops effectively can be given. In addition, an effective posture for removing foreign matter can be detected by the posture detection sensor. In addition, it is possible to control with an effective posture when removing foreign matter from the focusing plate and the optical low-pass filter whose surfaces are orthogonal to each other. In addition, it is possible to notify the photographer of an effective posture when removing foreign matter from the focus plate and the optical low-pass filter.

[Second Embodiment]
FIG. 6 is a block diagram showing an electrical configuration of the digital single-lens reflex camera according to the second embodiment. FIG. 7 is a diagram showing the configuration of the focus plate unit. FIG. 4B is a plan view of the focus plate unit. The figure (a) is the arrow BB sectional drawing in the figure (b). The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the second embodiment, the configuration of the focus plate unit is different from that of the first embodiment, and the metal frame is sandwiched between the piezoelectric elements on both sides. As in the first embodiment, the focus plate 20 is assembled to a metal frame 23 made of a material having a relatively large specific gravity such as copper or iron via a fixed frame 24 to form a focus plate unit. Then, the two piezoelectric elements 22 (subject side) and the piezoelectric element 21 (imaging element side) are fixed so as to sandwich the metal frame 23, and the focusing plate unit is fixed in the mirror box.

  Here, the operation of removing foreign matter from the focusing plate 20 will be described. Similar to the first embodiment, the camera control unit 306 of the camera body 101 shifts to the cleaning mode when the operation unit 32 is operated by the user. When the camera control unit 306 receives the cleaning mode command signal from the operation unit 32 via the I / O 307, the camera control unit 306 controls the piezoelectric element driving unit 301 to drive the piezoelectric elements 21 and 22 and the piezoelectric element 110a. Is generated.

  FIG. 8 is a diagram showing a vibration form of the focus plate 20. FIG. 2A shows a state in which no periodic voltage is applied to the piezoelectric elements 21 and 22. When a periodic voltage is applied to the piezoelectric elements 21 and 22 of the focus plate 20, the piezoelectric element 22 contracts, the piezoelectric element 21 expands, and the focus plate 20 moves to the subject side as a whole (see FIG. 4B). .

  Thereafter, when the voltage is reversed, the piezoelectric element 22 is expanded, the piezoelectric element 21 is contracted, and the focusing plate 20 is moved to the photographing element side as a whole (see FIGS. 3C and 3D). Further, when the voltage is reversed from this state, the piezoelectric element 22 contracts again, the piezoelectric element 21 expands, and the focusing plate 20 moves to the subject side as a whole (see FIGS. 4A and 4B). In this way, vibration is repeated.

  With the above vibration mode, the focus plate 20 can be vibrated as a whole, and foreign matter adhering to the surface can be screened off.

  Note that vibration control according to the posture and vibration control of the optical low-pass filter are the same as those in the first embodiment, and thus detailed description thereof is omitted.

  According to the digital single-lens reflex camera of the second embodiment, the vibration of the focusing screen 20 is made more reliable by using the two piezoelectric elements 22 (subject side) and the piezoelectric element 21 (imaging element side). Can do.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration can be used as long as the functions shown in the claims or the functions of the configuration of the present embodiment can be achieved. Is also applicable.

  For example, in the above-described embodiment, the optical member disposed in front of the image sensor is an optical low-pass filter, but other optical members such as an infrared absorption filter may be used.

It is a center sectional view showing the structure of the digital single-lens reflex camera in the first embodiment. It is a block diagram which shows the electrical structure of a digital single-lens reflex camera. It is a figure which shows the structure of a focus board unit. It is a disassembled perspective view which shows the structure of an imaging unit. 4 is a flowchart showing an operation procedure for removing foreign matter between the focus plate and the optical low-pass filter. It is a block diagram which shows the electric constitution of the digital single-lens reflex camera in 2nd Embodiment. It is a figure which shows the structure of a focus board unit. It is a figure which shows the vibration form of the focus board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image | photographing optical axis 1a Finder optical axis 10, 20 Focus plate 15, 21, 22, 110a Piezoelectric element 32 Operation part 110 Optical low-pass filter 301 Piezoelectric element drive part 306 Camera control part 308 External display 310 Attitude detection sensor

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;
A focusing plate provided in a viewfinder optical system for observing the subject;
An imaging apparatus including a reflecting unit disposed on the photographing optical axis and configured to reflect the light of the subject and guide the light to the finder optical system;
First vibration means for vibrating the optical member;
A second vibration unit that vibrates the focus plate in a vibration mode different from the vibration mode of the first vibration unit;
Drive means for driving the first vibration means and the second vibration means;
An imaging apparatus comprising: control means for controlling the driving means.   The imaging apparatus according to claim 1, wherein the driving unit is driven by applying a periodic voltage generated by the same driving circuit to the first vibrating unit and the second vibrating unit. The first vibration means vibrates the focus plate in a direction perpendicular to the finder optical axis integrally with a frame provided on the outer periphery thereof,
The imaging apparatus according to claim 1, wherein the second vibration unit vibrates the optical member so that a displacement of a vibration amplitude changes in an optical axis direction. A posture detecting means for detecting the posture of the imaging device;
The control means controls the driving means according to the attitude of the imaging device detected by the attitude detection means, and gives priority to either the first vibration means or the second vibration means. The image pickup apparatus according to claim 1, wherein the image pickup apparatus is driven by An image sensor that converts an optical image of a subject into an electrical signal, an optical member that is disposed in front of the image sensor and on the photographing optical axis, and a focus plate that is provided in a viewfinder optical system for observing the subject An excitation control method for an imaging apparatus, comprising: a reflecting unit disposed on the photographing optical axis and reflecting light of the subject to be guided to the finder optical system,
A first vibration step for vibrating the optical member by first vibration means;
A second vibration step of vibrating the focus plate in a vibration mode different from the vibration mode of the first vibration unit by a second vibration unit;
And a control step of controlling a driving means for driving the first vibration means and the second vibration means by the control means.

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