JP2006349804A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely avoid the interference of a mirror with a new lens device having a large projecting amount from a mount surface to an image surface side. <P>SOLUTION: The imaging apparatus 1, to/from which the first lens device 114 and the second lens device 14 having the larger projecting amount from the mount surface toward the image surface than the first lens device can be attached/detached, has a first mirror 3 which can be driven between a first position where it is arranged in an optical path from the attached lens device and a second position where it is arranged out of the optical path, and a control means 6 which discriminates whether or not the attached lens device is the second lens device and inhibits the driving of the first mirror between the first and the second positions when it is the second lens device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an imaging device in which a lens device can be attached and detached.

  As an interchangeable lens for single-lens reflex digital cameras, an interchangeable lens with a smaller back focus, which is the distance from the image circle and the rear end of the lens to the focal plane, than a conventional interchangeable lens for 24 × 36 mm aperture size (hereinafter referred to as a conventional lens). (Hereinafter referred to as a new lens) has been commercialized. This new lens was manufactured for a smaller single-lens reflex digital camera equipped with an image sensor of a smaller size than the conventional lens according to the smaller image circle, and the lens itself as a whole compared to the conventional lens Miniaturization is achieved.

  However, in the new lens, the amount of protrusion from the mount surface, that is, the mounting reference surface to the camera, that is, toward the image surface side is larger than that of the conventional interchangeable lens. For this reason, when this new lens is mounted on a conventional camera that supports back focus (hereinafter referred to as a conventional camera), a mirror (main mirror) that rotates so as to enter and exit the imaging optical path is located behind the new lens. Interfere with the edge.

  Therefore, heretofore, a means for preventing the new lens from being mechanically attached to the conventional camera has been employed (see Patent Document 1).

On the other hand, in Patent Document 2, the first mirror guides the light reflected by the main mirror to the optical viewfinder and the light transmitted through the main mirror to the focus detection unit by moving the main mirror to a different position in the photographing optical path. There has been proposed a single-lens reflex digital camera capable of switching between a state and a second state in which light reflected by the main mirror is guided to a focus detection unit and light transmitted through the main mirror is guided to an image sensor. According to this camera, the light can be guided to the image sensor and the focus detection unit in the second state, so that only the object observation by the optical finder and the focus detection in the state where the light is guided to the optical finder can be performed so far. A single lens reflex camera can be added with a function of observing a subject with an electronic viewfinder and a focus detection function in a state where light is guided to an image pickup device, and can greatly improve the usability of the single lens reflex camera.
JP-A-8-43909 (paragraph 0040, FIG. 4 etc.) JP 2004-264832 A (paragraphs 0042-0046, FIGS. 1-7, etc.)

  In the camera proposed in Patent Document 2, light can be guided to the image sensor in the second state, so that imaging can be performed without moving the main mirror out of the imaging optical path. Therefore, it is possible to perform imaging in the second state with the new lens attached.

  However, the camera of Patent Document 2 is similar to the conventional camera in that the main mirror rotates so as to enter and exit the imaging optical path. Therefore, it is necessary to reliably avoid interference with the rear end portion of the new lens of the main mirror while effectively utilizing the ability to perform imaging in the second state.

  It is an object of the present invention to provide an imaging apparatus that can reliably avoid interference of a mirror with a new lens apparatus having a large amount of protrusion from the mount surface toward the image plane side. It is another object of the present invention to provide an imaging apparatus that can perform imaging using a new lens apparatus while avoiding such interference.

  An imaging device according to an aspect of the present invention is an imaging device in which a first lens device and a second lens device having a larger projection amount from the mount surface in the image plane direction than the first lens device can be attached and detached. A first mirror capable of driving between a first position arranged in an optical path from the attached lens device and a second position arranged outside the optical path, and the attachment Control means for discriminating whether or not the selected lens device is the second lens device, and prohibiting the driving of the first mirror between the first and second positions when the lens device is the second lens device It is characterized by having.

  And in this imaging device, imaging in the state where the 1st mirror is arranged in the 1st position is permitted, or imaging in the state where the 1st mirror is arranged in the 3rd position in the optical path May be allowed.

  According to the present invention, when the second lens device is attached, the driving of the first mirror in and out of the optical path is prohibited, so that the contact (interference) of the first mirror with the second lens device is ensured. It can be avoided.

  In addition, by allowing the imaging in a state where the first mirror is disposed in the optical path, it is possible to perform imaging using the second lens device.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a schematic configuration of a camera system including a single-lens reflex camera as an image pickup apparatus that is Embodiment 1 of the present invention. Reference numeral 1 denotes the single-lens reflex camera (camera body). This single-lens reflex camera 1 is a camera corresponding to the conventional lens described above. Reference numeral 14 denotes an interchangeable lens as a second lens device. FIG. 4 shows an electrical configuration of the single-lens reflex camera.

  In the camera 1 shown in FIG. 1, reference numeral 2 denotes a finder optical system including a focus plate, a pentaprism, an eyepiece, and the like.

  Reference numeral 3 denotes a main mirror as a first mirror constituted by a half mirror that reflects a part of the light from the interchangeable lens 14 and transmits the other part. Reference numeral 4 denotes a sub-mirror as a second mirror that reflects the light transmitted through the main mirror 3. The main mirror 3 has a position inclined obliquely upward (hereinafter referred to as a first position) in the photographing optical path through which light from the interchangeable lens 14 passes as shown by a dotted line in FIG. It is driven between positions (hereinafter referred to as second positions). In addition, as will be described later with reference to FIG. 2C, the main mirror 3 is also located at a position tilted obliquely downward (hereinafter referred to as a third position) in the optical path. The main mirror 3 is driven between the above positions by a drive mechanism including a mirror drive motor M shown in FIG.

  The sub mirror 4 is driven in and out of the photographing optical path in conjunction with the driving of the main mirror 3 by an interlocking mechanism (not shown) constituted by a cam mechanism or the like.

  Reference numeral 7 denotes a release switch. When the release switch 7 is pressed halfway, a focus detection operation or a photometry operation by a phase difference detection method using the focus detection / photometry unit 12 is started. When the release switch 7 is fully pressed, a recording image is generated based on the driving of the shutter 22 and the output from the imaging device 5, that is, an imaging process is performed.

  As shown in FIGS. 2A to 2C, the camera 1 can also be equipped with an interchangeable lens 114 as a first lens device. In this case, when the release switch 7 is fully pressed, the main mirror 3 and the sub mirror 4 are also driven from positions in the photographing optical path to positions outside the photographing optical path. As the image sensor 5, a CCD sensor, a CMOS sensor, or the like is used.

  Here, the interchangeable lens 14 is provided with a lens side mount portion that is attached by bayonet coupling to a camera side mount portion provided in the camera 1, and the lens side mount portion includes a camera side mount. A mount surface 14a that abuts against the mount surface 1a of the part is formed. Of the interchangeable lens 14, the final lens 15 disposed closest to the image plane side and a portion that holds the final lens 15 protrude from the mount surface 14 a toward the image plane side by P <b> 2.

  On the other hand, the interchangeable lens 114 shown in FIGS. 2A to 2C is provided with a lens side mount portion common to the interchangeable lens 14, and the final lens 115 disposed on the most image surface side of the interchangeable lens 114 and the lens. The portion to be held protrudes from the mount surface 114a of the lens side mount portion to the image plane side by P1, which is smaller than P2. That is, the interchangeable lens 14 is a lens in which the protrusion amount P2 from the mount surface 14a to the image surface side is larger than the protrusion amount P1 of the interchangeable lens 114.

  This is because the distance from the final lens 15 to the image plane in the interchangeable lens 14, that is, the back focus, is shorter than the back focus of the interchangeable lens 114. The image circle formed by the interchangeable lens 14 is smaller than the image circle formed by the interchangeable lens 114.

  A camera control circuit 6 includes a CPU and the like. When the camera control circuit 6 detects a half-press operation of the release switch 7, it performs a focus detection operation and a photometry operation based on a signal from the focus detection / photometry unit 12. Then, based on the focus detection result, the focus control information (drive amount and drive direction of the focus lens) of the interchangeable lens 14 is calculated, and the calculation result is transmitted to a lens control circuit (not shown) in the interchangeable lens. The transmission is performed via a camera communication terminal 13 provided in the mount portion of the camera 1 and a lens communication terminal 16 provided in the mount portion of the interchangeable lens 14.

  In addition, the camera control circuit 6 calculates control information for a diaphragm (not shown) and the shutter 22 in the interchangeable lens 14 based on the photometric result, and transmits the control information for the diaphragm to the lens control circuit. The lens control circuit drives the focus lens and the diaphragm based on the control information. These operations of the camera control circuit 6 are performed similarly when the interchangeable lens 114 is attached.

  Further, when the camera control circuit 6 detects that the release switch 7 is fully pressed, the camera control circuit 6 controls the mirror drive motor M or the operation of the shutter 22 via the driver 18 shown in FIG. Further, reading of electric charges accumulated in the image sensor 5, generation processing of a recording image by the image processing circuit 19 based on the read signal, and recording processing of the generated recording image on the recording medium 11 are performed. The recording medium 11 is constituted by a semiconductor memory, an optical disk, or the like, and can be attached to and detached from the camera 1. Recording on the recording medium 11 and reading of an image from the recording medium 11 are performed via the recording circuit 20.

  The recorded image is displayed on a display 9 such as an LCD provided on the back of the camera 1 for a predetermined time.

  In FIGS. 1 and 4, reference numeral 10 denotes an imaging position selection switch for causing a photographer to select a later-described imaging mode. In FIG. 4, reference numeral 21 denotes a main switch for turning on / off the power of the camera 1.

  2A to 2B show the conventional back focus, that is, the interchangeable lens 114 (hereinafter referred to as a conventional interchangeable lens) having a longer back focus than the interchangeable lens 14 (hereinafter referred to as a new interchangeable lens). The operation of the camera 1 is shown. When the conventional interchangeable lens 114 is attached, the camera control circuit 6 in the camera 1 replaces the conventional interchangeable lens having the back focus from the lens control circuit of the conventional interchangeable lens 114 (the conventional interchangeable lens with a small rearward protrusion amount from the mount surface). Information that can be determined to be a lens).

  FIG. 2A shows a state in which the main mirror 3 is arranged at the first position. In this state, part of the subject light from the conventional interchangeable lens 114 is reflected by the main mirror 3. Further, the other part of the subject light is transmitted through the main mirror 3, and the transmitted light is reflected toward the focus detection / photometry unit 12 by the sub-mirror 4 disposed at the position in the optical path behind the main mirror 3. . Thereby, subject observation, focus detection and photometry can be performed by the finder optical system 2. The conventional interchangeable lens 114 receives the focus control information and the aperture control information based on the focus detection result and the photometry result from the camera control circuit 6 and performs focus drive and aperture drive. The camera control circuit 6 generates shutter control information based on the photometric result. In this state, since the sub mirror 4 exists in the optical path, the imaging element 5 cannot perform imaging.

  FIG. 2B shows a state in which the main mirror 3 is disposed at the second position. In this state, the main mirror 3 and the sub mirror 4 are flipped upward so as to be retracted out of the optical path.

  When imaging in this state is selected by operating the imaging position selection switch 10 in the state of FIG. 2A, the imaging positions of the main mirror 3 and the sub mirror 4 are stored in the memory 17 shown in FIG. The camera control circuit 6 obtains in advance information capable of determining that the attached interchangeable lens is the conventional interchangeable lens 114. In this case, the main mirror 3 is driven from the first position to the second position. Also, the main mirror 3 and the sub mirror 4 do not collide with the rear end portion of the interchangeable lens 114. For this reason, when a photographing command is received by fully pressing the release button 7 in the state of FIG. 2A, the mirror drive motor M is driven via the driver 8, and the main mirror 3 and the sub mirror 4 are moved from the position of FIG. Rotate to position.

  The camera control circuit 6 controls the shutter 22 and the drive of the image sensor 5 based on the shutter control information generated in the state of FIG. 2A after the state of FIG. Therefore, the subject light from the conventional interchangeable lens 114 can sufficiently reach the image sensor 5 and a bright and high-definition still image can be captured.

  When the imaging (exposure of the image sensor 5) in the state of FIG. 2B is completed and the shutter 22 is closed, the camera control circuit 6 drives the mirror drive motor M via the driver 8 to move the main mirror 3 and the sub mirror 4 together. Return to the state of FIG. 2A.

  FIG. 2C shows a state in which the main mirror 3 is disposed at the third position. In this state, part of the subject light from the conventional interchangeable lens 114 passes through the main mirror 3 and reaches the image sensor 5, and the other part of the subject light is reflected toward the focus detection / photometry unit 12. The Thereby, subject observation, focus detection, and photometry can be performed by the display 9 as an electronic viewfinder. Further, in this state, since the sub mirror 4 is retracted out of the optical path, it is possible to perform imaging (for example, high-speed continuous shooting or moving image shooting) with the imaging element 5 using subject light transmitted through the main mirror 3.

  When taking an image directly from the observation of the subject in this state, the camera control circuit 6 performs focus detection and photometry, and transmits focus control information and aperture control information based on these results to the conventional interchangeable lens 114. The camera control circuit 6 generates shutter control information based on the photometric result.

  On the other hand, when imaging in the state shown in FIG. 2C is selected by operating the imaging position selection switch 10 in the state shown in FIG. 2A, the imaging positions in FIG. 2C of the main mirror 3 and the sub mirror 4 are the memory 17 shown in FIG. Is remembered. When a shooting command is received by pressing the release button 7 fully, the mirror drive motor M is driven via the driver 8 to move the main mirror 3 and the sub mirror 4 from the position shown in FIG. 2A to the position shown in FIG. 2C. At this time, the main mirror 3 is rotated backward while the rotation axis of the main mirror 3 indicated by a circle in the drawing is advanced from the imaging element 5 side. The sub mirror 4 is retracted from the position in the optical path to the position outside the optical path.

  After entering the state of FIG. 2C, the camera control circuit 6 controls the shutter 22 based on the shutter control information generated in the state of FIG. 2A and controls the drive of the image sensor 5 to perform imaging.

  When the image capturing (exposure of the image sensor 5) in the state of FIG. 2C is finished and the shutter 22 is closed, the camera control circuit 6 drives the mirror drive motor M via the driver 8 to move the main mirror 3 and the sub mirror 4 together. Return to the state of FIG. 2A.

  As described above, in the camera of this embodiment, the state shown in FIG. 2A can be switched to the state shown in FIG. 2B and the state shown in FIG. Then, after driving to the state shown in FIG. 2B or the state shown in FIG. 2C, the state returns to the initial state.

  3A to 3B show the operation of the camera 1 of the present embodiment with the new interchangeable lens 14 attached. When the new interchangeable lens 14 is attached, the camera control circuit 6 in the camera 1 detects from the lens control circuit of the new interchangeable lens 14 an interchangeable lens having a shorter back focus than the conventional one (a new protrusion with a large rearward protrusion amount from the mount surface). Information that can be determined to be an interchangeable lens is obtained.

  FIG. 3A shows a state in which the main mirror 3 is arranged at the first position, as in FIG. 2A. In this state, part of the subject light from the new interchangeable lens 14 is reflected by the main mirror 3. Further, the other part of the subject light is transmitted through the main mirror 3, and the transmitted light is reflected toward the focus detection / photometry unit 12 by the sub-mirror 4 disposed at the position in the optical path behind the main mirror 3. . As a result, as described with reference to FIG. 2A, subject observation, focus detection, and photometry can be performed by the finder optical system 2. The new interchangeable lens 14 receives the focus control information and the aperture control information based on the focus detection result and the photometry result from the camera control circuit 6 and performs focus drive and aperture drive. The camera control circuit 6 generates shutter control information based on the photometric result. In this state, since the sub mirror 4 exists in the optical path, the imaging element 5 cannot perform imaging.

  FIG. 3B shows a state corresponding to FIG. 2B. However, if the main mirror 3 is rotated from the first position to the second position when the new interchangeable lens 14 is attached, the main mirror 3 (or the sub mirror 4 in some cases) is newly replaced. Colliding with the rear end of the lens 14. Therefore, when the information that can determine that the new interchangeable lens 14 is attached has been acquired, the camera control circuit 6 can select the image pickup in the state of FIG. 3B by the image pickup position selection switch 10. The main mirror 3 and the sub mirror 4 are prohibited from rotating from the position in FIG. 3A (first position) to the position in FIG. 3B (second position), and imaging in the state of FIG. 3B is disabled.

  Further, the camera control circuit 6 prohibits the main mirror 3 and the sub mirror 4 from rotating from the position of FIG. 3B to the position of FIG. 3A.

  FIG. 3C shows a state in which the main mirror 3 is disposed at the third position. In this state, part of the subject light from the new interchangeable lens 14 passes through the main mirror 3 and reaches the image sensor 5, and the other part of the subject light is reflected toward the focus detection / photometry unit 12. The Thereby, subject observation, focus detection, and photometry can be performed by the display 9 as an electronic viewfinder. Further, in this state, since the sub mirror 4 is retracted out of the optical path, it is possible to perform imaging (for example, high-speed continuous shooting or moving image shooting) with the imaging element 5 using subject light transmitted through the main mirror 3.

  When imaging is performed as it is from observation of the subject in this state, the camera control circuit 6 performs focus detection and photometry, and transmits focus control information and aperture control information based on these results to the new interchangeable lens 14. The camera control circuit 6 generates shutter control information based on the photometric result.

  On the other hand, when imaging in the state shown in FIG. 3C is selected by operating the imaging position selection switch 10 in the state shown in FIG. 3A, the imaging positions in FIG. 3C of the main mirror 3 and the sub mirror 4 are stored in the memory 17 shown in FIG. Remembered. When a shooting command is received by pressing the release button 7 fully, the mirror drive motor M is driven via the driver 8 to move the main mirror 3 and the sub mirror 4 from the position of FIG. 3A to the position of FIG. 3C. At this time, the main mirror 3 is rotated backward while the rotation axis of the main mirror 3 indicated by a circle in the drawing is advanced from the imaging element 5 side. The sub mirror 4 is retracted from the position in the optical path to the position outside the optical path.

  Here, at the time of transition from the state of FIG. 3A to the state of FIG. 3C, the main mirror 3 and the sub mirror 4 do not collide with the rear end portion of the new interchangeable lens 14. Therefore, the camera control circuit 6 allows the driving of the main mirror 3 and the sub mirror 4 from the position of FIG. 3A to the position of FIG. 3C.

  After entering the state of FIG. 3C, the camera control circuit 6 controls the shutter 22 based on the shutter control information generated in the state of FIG. 3A and controls the drive of the image sensor 5 to perform imaging.

  When the image pickup (exposure of the image pickup device 5) in the state of FIG. 3C is finished and the shutter 22 is closed, the camera control circuit 6 drives the mirror drive motor M via the driver 8 to move the main mirror 3 and the sub mirror 4 together. Return to the initial position of FIG. 3A. In the transition from the state of FIG. 3C to the state of FIG. 3A, the main mirror 3 and the sub mirror 4 do not collide with the rear end portion of the new interchangeable lens 14. 4 is allowed to return from the position shown in FIG. 3C to the position shown in FIG. 3A. Thereby, in the camera 1 compatible with the conventional interchangeable lens, imaging using the new interchangeable lens 14 is enabled, and collision (interference) between the rear end portion of the new interchangeable lens 14 and the main mirror 3 and the sub mirror 4 is surely avoided. can do.

  In the state shown in FIG. 3A described above, when the transition to the state shown in FIG. 3B is prohibited, the camera control circuit 6 does not perform the image pickup operation as it is when receiving a shooting command by fully pressing the release button 7. Alternatively, the imaging operation may be performed by automatically shifting to the state of FIG. 3C.

  FIG. 5 shows a processing sequence of the camera control circuit 6 in the camera 1 of this embodiment. This processing sequence is executed according to a computer program stored in a memory (not shown) provided inside or outside the camera control circuit 6. Further, “S” in FIG. 5 means a step.

  When the interchangeable lens (14 or 114) is attached to the camera 1, the camera control circuit 6 acquires various information (lens information) of the interchangeable lens through initial communication with the lens control circuit (S501). This lens information includes lens identification information indicating whether the attached interchangeable lens is the new interchangeable lens 14 or the conventional interchangeable lens 114. For example, information indicating the model name of the interchangeable lens and the back focus length may be used. The camera control circuit 6 stores the lens information in the memory 17 (S502).

  Next, the camera control circuit 6 determines whether the lens identification information indicates the new interchangeable lens (short back focus lens) 14 or the conventional interchangeable lens (long back focus lens) 114 (S503). In the case of the new interchangeable lens 14, it is determined whether the imaging position selected by the imaging position selection switch 10 is the position shown in FIG. 3C (imaging position C) or the position shown in FIG. 3B (imaging position B) (S504). In the case of the imaging position B, as a warning operation, a warning display indicating that imaging cannot be performed at the position shown in FIG. 3B is performed on the display 9, or a warning sound is output from a speaker (not shown) (S505). ). At this time, it is displayed on the display 9 that the reason why the image cannot be taken at the position shown in FIG. 3B is the guide display because the short back focus lens is used, or the image pickup position is set to the position shown in FIG. 3C. It may be displayed that the image can be captured by changing the setting.

  On the other hand, when the interchangeable lens mounted in S504 is determined to be the conventional interchangeable lens 114, and when it is determined that the imaging position selected in S504 is the imaging position C, after the warning operation in S505 is completed, It is determined whether or not the release switch 7 is pressed halfway (S506).

  When the release switch 7 is not operated, the process proceeds to S517. When the release switch 7 is half-pressed, the imaging position selected by the imaging position selection switch 10 is an imaging position where contact with the mirrors 3 and 4 does not occur with respect to the mounted interchangeable lens. It is determined whether or not (S507). That is, it is determined whether or not the imaging position C is selected when the new interchangeable lens 14 is attached. When the conventional interchangeable lens 114 is attached, contact with the mirrors 3 and 4 does not occur even if any of the imaging positions B and C shown in FIGS. 2B and 2C is selected. It memorize | stores in the memory 17, and progresses to S508.

  If the new interchangeable lens 14 is attached and the imaging position B where contact with the mirrors 3 and 4 occurs is selected, a warning operation is performed again (S515). Then, the driving of the mirrors 3 and 4 from the position shown in FIG. 3A to the position shown in FIG. 3B is prohibited (S516). Thereafter, the process proceeds to S517.

  If it is determined in S507 that the imaging position C at which the new interchangeable lens 14 does not come into contact with the mirrors 3 and 4 is selected, the process proceeds to S508.

  In S508, the camera control circuit 6 performs focus detection and photometry through the focus detection / photometry unit 12 in the state of FIG. 2A or FIG. 3A, and exchanges focus control information and aperture control information generated based on these results. To the lens control circuit. Also, shutter control information and the like are generated based on the photometric result.

  Next, on condition that the release switch 7 is fully pressed, the mirrors 3 and 4 are driven to a position corresponding to the selected imaging position (S509).

  Then, after confirming the end of driving of the mirrors 3 and 4, the camera control circuit 6 drives the shutter 22 to perform an imaging operation (S510).

  When the imaging operation is completed in this way, processing such as image generation and image compression is performed on the charge signal read from the image sensor 5 (S512), and the generated compressed recording image is stored in the recording medium 11 (S513). The image to be recorded is temporarily displayed on the display 9 (S514). After this, the process proceeds to S517.

  In S517, it is determined whether or not the state of the imaging position selection switch 10 has changed, that is, whether or not the imaging position has been changed. If the imaging position has not been changed, the process proceeds to S523, and if it has been changed, it is determined whether or not the attached interchangeable lens is the new interchangeable lens 14 (S518). If the new interchangeable lens 14 is attached, the process proceeds to S521. If the conventional interchangeable lens 114 is attached, the imaging position selected by the imaging position selection switch 10 is stored in the memory 17 (S519), and the display 9 displays that the imaging position has been changed ( S520). Then, the process proceeds to S523.

  In S521, it is determined whether the imaging position C at which the mirrors 3 and 4 do not contact the interchangeable lens 14 is selected or the imaging position B at which the contact occurs is selected. If the imaging position C is selected, the process proceeds to S519. On the other hand, when the imaging position B is selected, the process proceeds to S522, and a warning operation similar to S515 is performed. Then, the process proceeds to S523.

  In S523, the main switch 21 is detected. When it is detected that the main switch 21 is turned off, this sequence ends. If the main switch 21 is not turned off, the process returns to S501.

  FIG. 6 shows a part of the processing sequence in the camera which is Embodiment 2 of the present invention. The present embodiment shows a modification of the portions of S504 and S505 in the processing sequence shown in FIG.

  If the camera control circuit 6 determines in step S503 in FIG. 5 that the new interchangeable lens 14 is attached, the process proceeds to step S601 in FIG. In S601, it is determined whether the imaging position selected by the imaging position selection switch 10 is the imaging position C where the mirrors 3 and 4 do not contact the mounted new interchangeable lens 14 or the imaging position B where the contact occurs. When the imaging position C is selected, the process proceeds to S506 in FIG.

  On the other hand, when the imaging position B is selected, the camera control circuit 6 displays on the display 9 whether or not to change the imaging position to the imaging position C (S602), and prompts the photographer to change the imaging position. . If the imaging position is not changed by the imaging position selection switch 10 even after a predetermined time has elapsed after the start of the display, a warning operation similar to S515 in FIG. 5 is performed, and the process proceeds to S506 shown in FIG.

  If the imaging position is changed to C by the imaging position selection switch 10 before the predetermined time has elapsed, the imaging position C is stored in the memory 17 (S603), and the imaging position is changed to C on the display 9. Is displayed (S604). Then, the process proceeds to S506.

  According to the present embodiment, when the new interchangeable lens 14 is used, the camera 1 prompts the user to select or change the imaging position where no contact with the mirrors 3 and 4 occurs. It is possible to prevent the photographer from wondering which imaging position should be selected, and to realize a camera that is extremely easy for the photographer to use.

  FIG. 7 shows a part of the processing sequence in the camera which is Embodiment 3 of the present invention. The present embodiment shows a modification of the portions of S504 and S505 in the processing sequence shown in FIG.

  If the camera control circuit 6 determines in step S503 in FIG. 5 that the new interchangeable lens 14 is attached, the process proceeds to step S701 in FIG. In S701, it is determined whether the imaging position selected by the imaging position selection switch 10 is the imaging position C where the mirrors 3 and 4 do not contact the mounted new interchangeable lens 14 or the imaging position B where the contact occurs. When the imaging position C is selected, the process proceeds to S506 in FIG.

  On the other hand, when the imaging position B is selected, the camera control circuit 6 forcibly (automatically) changes the imaging position B stored in the memory 17 to the imaging position C (S702). Then, it is displayed on the display 9 that the imaging position has been changed to C (S703), and then the process proceeds to S506 in FIG.

  As described above, when the photographer selects the imaging position B when the new interchangeable lens 14 is used, the camera 1 automatically changes the imaging position to C. Therefore, it is necessary to change the imaging position by the photographer. Therefore, imaging at an appropriate imaging position is possible.

  FIG. 8 shows an operation when the new interchangeable lens 14 is attached to the camera that is Embodiment 4 of the present invention. The basic configuration of the camera 1 'of the present embodiment is the same as that of the first embodiment, except that the main mirror 14 is driven only between the first position and the second position, and the sub mirror 4'. Is different from the first embodiment in that it is driven between a position in the imaging optical path (fourth position) and a position outside the imaging optical path (fifth position) independently of the main mirror 3. Constituent elements common to the first embodiment are denoted by the same reference numerals as those of the first embodiment and are not described.

  When the new interchangeable lens 14 is attached, the camera control circuit 6 in the camera 1 ′ has an interchangeable lens with a shorter back focus than the conventional lens control circuit of the new interchangeable lens 14 (the rear protrusion amount from the mount surface is large). Information that can be determined to be a new interchangeable lens is obtained.

  FIG. 8A shows a state in which the main mirror 3 is arranged at the first position, similarly to FIG. 3A of the first embodiment. In this state, part of the subject light from the new interchangeable lens 14 is reflected by the main mirror 3. Further, another part of the subject light is transmitted through the main mirror 3, and the transmitted light is reflected toward the focus detection / photometry unit 12 by the sub-mirror 4 ′ disposed at the position in the optical path behind the main mirror 3. The As a result, as described with reference to FIG. 3A, subject observation, focus detection, and photometry can be performed by the finder optical system 2. The new interchangeable lens 14 receives the focus control information and the aperture control information based on the focus detection result and the photometry result from the camera control circuit 6 and performs focus drive and aperture drive. The camera control circuit 6 generates shutter control information based on the photometric result. In this state, since the sub mirror 4 ′ is present in the optical path, the image pickup by the image pickup device 5 cannot be performed.

  FIG. 8B shows a state in which the main mirror 3 is rotated to the second position and the sub mirror 4 ′ is retracted out of the photographing optical path. However, when the main mirror 3 is rotated from the first position toward the second position when the new interchangeable lens 14 is mounted, the main mirror 3 collides with the rear end portion of the new interchangeable lens 14. Resulting in. Therefore, when the information that can determine that the new interchangeable lens 14 is attached has been acquired, the camera control circuit 6 can select the image pickup in the state of FIG. The main mirror 3 is prohibited from rotating from the position (first position) in FIG. 8A to the position (second position) in FIG. 8B, and imaging in the state of FIG. 8B is disabled. Further, the camera control circuit 6 prohibits the rotation of the main mirror 3 from the position shown in FIG. 8B to the position shown in FIG. 8A.

  FIG. 8C shows a state in which the sub mirror 4 ′ is retracted to the position outside the optical path while the main mirror 3 is disposed at the first position. In this state, part of the subject light from the new interchangeable lens 14 passes through the main mirror 3 and reaches the image sensor 5. As a result, the subject can be observed by the display 9 as an electronic viewfinder. Further, in this state, the sub mirror 4 'is retracted out of the photographing optical path, so that imaging by the imaging element 5 using the subject light transmitted through the main mirror 3 (for example, high-speed continuous photographing or moving image photographing) is also possible. .

  When imaging in the state shown in FIG. 8C is selected by operating the imaging position selection switch 10 in the state shown in FIG. 8A, the imaging positions in FIG. 8C of the main mirror 3 and the sub mirror 4 ′ are stored in the memory 17 shown in FIG. Remembered. When a shooting command is received by fully pressing the release button 7, a sub mirror drive motor M1 provided separately from the main mirror is driven to move the sub mirror 4 'from the position of FIG. 8A to the position of FIG. 8C. .

  Here, since the main mirror 3 is not rotated during the transition from the state of FIG. 8A to the state of FIG. 8C, the main mirror 3 does not collide with the rear end portion of the new interchangeable lens 14. Since the sub mirror 4 ′ is also rotated at a position close to the image sensor 5, it does not collide with the rear end portion of the new interchangeable lens 14. Therefore, the camera control circuit 6 allows the driving of the sub mirror 4 'from the state of FIG. 8A to the state of FIG. 8C.

  The camera control circuit 6 controls the shutter 22 shown in FIG. 4 and the drive of the image sensor 5 based on the shutter control information generated in the state shown in FIG. 8A after the state shown in FIG. 8C. Take an image.

  When imaging (exposure of the image sensor 5) in the state of FIG. 8C is completed and the shutter 22 is closed, the camera control circuit 6 drives the sub mirror drive motor M1 to return the sub mirror 4 ′ to the initial position of FIG. 8A. In the transition from the state of FIG. 8C to the state of FIG. 8A, the main mirror 3 that is not rotated and the sub mirror 4 ′ do not collide with the rear end portion of the new interchangeable lens 14. Return drive from the state of FIG. 8C to the state of FIG. 8A is allowed. As a result, in the camera 1 'compatible with the conventional interchangeable lens, imaging using the new interchangeable lens 14 is possible, and collision (interference) between the rear end portion of the new interchangeable lens 14 and the main mirror 3 and the sub mirror 4' is ensured. Can be avoided.

  In the state of FIG. 8A described above, when the imaging position selection switch 10 selects the imaging in the state of FIG. 8B but prohibits the transition to the state of FIG. 8B, the camera control circuit 6 displays the release button. The imaging operation may not be performed as it is when the imaging command by the full-press operation of 7 is received, or the photographer is prompted to change to the imaging position of FIG. The imaging operation may be performed by (automatically) shifting to the state of FIG. 8C.

  The conventional interchangeable lens 114 described in the above embodiment can also be attached to the camera 1 ′ of this embodiment. In this case, even if the state shown in FIG. 8A is changed to the state shown in FIG. 8B, that is, the main mirror 3 and the sub mirror 4 ′ are retracted from the photographing optical path, the main mirror 3 and the sub mirror 4 ′ are rear ends of the conventional interchangeable lens 114. There is no collision with the part. Therefore, when the conventional interchangeable lens 114 is mounted, the driving of the main mirror 3 and the sub mirror 4 ′ between the state of FIG. 8A and the state of FIG. 8B and the imaging in the state of FIG. 8B are permitted.

  Further, even when the state of FIG. 8A is shifted to the state of FIG. 8C, the main mirror 3 and the sub mirror 4 ′ do not collide with the rear end portion of the conventional interchangeable lens 114. Therefore, when the conventional interchangeable lens 114 is mounted, the driving of the sub mirror 4 'between the state of FIG. 8A and the state of FIG. 8C and the imaging in the state of FIG. 8C are permitted.

  According to the present embodiment, in the conventional interchangeable lens compatible camera 1 ′, it is possible to take an image using the new interchangeable lens 14, and the rear end portion of the new interchangeable lens 14 collides with the main mirror 3 and the sub mirror 4 ′ ( Interference) can be reliably avoided.

1 is a diagram illustrating a configuration of a camera system including a single-lens reflex digital camera that is Embodiment 1 of the present invention. FIG. FIG. 3 is a diagram illustrating a state in which a conventional lens is mounted and a main mirror is disposed at a first position in the camera according to the first exemplary embodiment. FIG. 3 is a diagram illustrating a state in which a conventional lens is mounted and a main mirror is disposed at a second position in the camera according to the first exemplary embodiment. FIG. 6 is a diagram illustrating a state in which a conventional lens is mounted and a main mirror is disposed at a third position in the camera according to the first exemplary embodiment. FIG. 3 is a diagram illustrating a state in which a new lens is mounted and a main mirror is disposed at a first position in the camera according to the first exemplary embodiment. FIG. 6 is a diagram illustrating a state in which a new lens is attached and driving of the main mirror to the second position is prohibited in the camera of Embodiment 1; FIG. 6 is a diagram illustrating a state in which a new lens is mounted and a main mirror is disposed at a third position in the camera according to the first exemplary embodiment. FIG. 3 is a block diagram illustrating an electrical configuration of the camera according to the first embodiment. 5 is a flowchart illustrating a processing sequence of the camera according to the first embodiment. 9 is a flowchart showing a processing sequence of a single-lens reflex digital camera lens that is Embodiment 2 of the present invention. 9 is a flowchart showing a processing sequence of a single-lens reflex digital camera lens that is Embodiment 3 of the present invention. In the single-lens reflex digital camera of Example 4 of this invention, the new lens is mounted | worn, and the figure which shows the state by which the main mirror was arrange | positioned in the 1st position, and the sub mirror was each in the 4th position. FIG. 10 is a diagram illustrating a state where a new lens is mounted and driving of the main mirror to the second position is prohibited in the camera of Embodiment 4. FIG. 10 is a diagram illustrating a state in which a new lens is mounted, a main mirror is disposed at a first position, and a sub mirror is disposed at a fifth position in the camera of Embodiment 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 'Camera 2 Finder optical system 3 Main mirror 4, 4' Sub mirror 5 Imaging element 6 Camera control circuit 7 Release switch 9 Display 10 Imaging position selection switch 12 Focus detection / photometry unit 14 New exchange lens 15 Final lens 114 Conventional exchange lens

Claims (8)

An imaging device capable of attaching and detaching a first lens device and a second lens device having a larger projection amount in the image plane direction from the mount surface than the first lens device,
A first mirror capable of driving between a first position arranged in the optical path from the mounted lens device and a second position arranged outside the optical path;
It is determined whether or not the mounted lens device is the second lens device, and when the lens device is the second lens device, the first mirror is driven between the first and second positions. And an image pickup apparatus having control means for prohibiting the image.   The imaging apparatus according to claim 1, wherein the control unit allows imaging in a state where the first mirror is disposed at the first position. The first mirror can be driven between the first position and the third position in the optical path;
The imaging apparatus according to claim 1, wherein the control unit allows imaging in a state where the first mirror is disposed at the third position. A fourth position drivable between a fourth position in the optical path that reflects light transmitted through the first mirror disposed in the first position and a fifth position disposed outside the optical path. Have two mirrors,
The control means allows driving of the second mirror between the fourth and fifth positions in a state where the first mirror is disposed at the first position. Item 4. The imaging device according to any one of Items 1 to 3.   The first mirror is disposed in the optical path with the first mirror disposed at the first position, reflects light transmitted through the first mirror, and the first mirror is disposed at the third position. The imaging apparatus according to claim 3, further comprising a second mirror disposed outside the optical path in a state where the imaging apparatus is in a state where the imaging apparatus is in a state where the imaging apparatus is in a state where the imaging apparatus is in the state.   The imaging device according to claim 1, wherein the second lens device is a lens device having a back focus shorter than that of the first lens device.   A camera system comprising: the imaging device according to claim 1; and the second lens device. 7. The lens device, which is the second lens device that can be attached to the imaging device according to claim 1.