JP2012145807A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus including a blocking mechanism for preventing a foreign matter from entering inside the imaging apparatus when a lens unit is not attached.SOLUTION: An imaging apparatus comprises: a lens mount on which a lens unit is removably attached; an image pickup device for outputting an image signal in accordance with subject light received through the lens unit; a shutter (5) for taking the subject light into the image pickup device; a driving means for operating the shutter; a sensor (7) for detecting whether or not the lens unit is attached onto the lens mount; a blocking mechanism (4), disposed between the lens mount and the image pickup device, for opening/closing an opening of the lens mount in accordance with whether or not the lens unit is attached; and a driving source switching means (3) for operating the blocking mechanism by the driving means (2).

Description

  The present invention is an image pickup apparatus having a mount for detachably mounting an interchangeable lens unit, and the mount unit is designed to prevent foreign matters such as dust from entering the image pickup apparatus when the lens unit is not mounted. The present invention relates to an imaging apparatus provided with a blocking mechanism that blocks an opening and the inside of the imaging apparatus.

  When the lens unit is detached from the mount, the inside of the image pickup apparatus is exposed from the opening of the mount. Since the image pickup device has precision parts such as an image sensor, foreign matter such as dust or dirt may enter the inside of the image sensor, resulting in a malfunction, and if dust or the like adheres to the light receiving surface of the image sensor, The adhering matter is reflected, and the image quality is adversely affected.

  Therefore, in order to prevent the image sensor from being exposed when the lens unit is removed, an imaging device having a sensor that detects attachment / detachment of the lens unit and a shielding mechanism that operates according to the detection result of the sensor is known. (For example, refer to Patent Document 1).

  In recent years, there has been a demand for downsizing as well as high performance for imaging devices. Therefore, if a shielding mechanism such as the imaging device described in Patent Document 1 is provided, it is possible to prevent foreign matter from being mixed inside the lens when replacing the lens, but a dedicated power source for operating the shielding mechanism, A transmission mechanism (such as a gear box) that transmits power and operates the shielding mechanism is required. Due to these dedicated power sources and transmission mechanisms, the main body of the imaging device has to be large, and there is a problem that it cannot meet the demand for miniaturization.

  If the power source of the shielding mechanism is omitted and the shielding mechanism is operated manually, the space of the power source can be omitted, but the shielding mechanism is independent of the attachment / detachment of the lens and the power on / off of the imaging device body. Therefore, there is a problem that inappropriate opening is performed and it is difficult to effectively prevent foreign matter from being mixed.

  The present invention has been made in view of the above problems, and is an imaging device including a mount for detachably mounting an interchangeable lens unit, and automatically shuts off the opening of the mount when the lens is replaced. To provide an imaging device that can effectively prevent foreign matter from being mixed during lens replacement while operating the shut-off mechanism with a shutter drive source and reducing the size without mounting a drive source dedicated to the shut-off mechanism. Objective.

  The present invention relates to an image pickup apparatus, and includes a lens mount to which a lens unit is detachably mounted, an image pickup element that outputs an image signal according to subject light received through the lens unit, and the image pickup element is a subject. An imaging device including a shutter for capturing light and a driving unit that operates the shutter, a sensor that detects whether or not a lens unit is attached to the lens mount, and a gap between the lens mount and the imaging device The main feature is that it has a blocking mechanism that opens or closes the opening of the lens mount in accordance with the attachment or detachment of the lens unit, and a drive source switching means that operates the blocking mechanism by the driving means. And

  The present invention also relates to the above-described imaging apparatus, comprising a sensor for detecting whether or not the lens unit is mounted on the lens mount, and the drive source switching means does not detect the mounting of the lens unit. In some cases, the shut-off mechanism is operated by the driving means.

  The present invention also relates to the above-described imaging device, wherein the blocking mechanism closes the opening of the lens mount when the sensor does not detect the mounting of the lens unit.

  The present invention also relates to the above-described imaging device, wherein the blocking mechanism shields between the lens mount and the imaging element when the sensor does not detect the mounting of the lens unit.

  The present invention also relates to the above-described imaging apparatus, wherein the sensor electrically detects the mounting of the lens unit.

  The present invention also relates to the above-described imaging device, wherein the blocking mechanism closes the opening of the lens mount when the sensor no longer detects the lens unit mounting from the state where the sensor has detected the lens unit mounting. It is characterized by being in a state.

  The present invention also relates to the above-described imaging apparatus, wherein the blocking mechanism operates when the lens unit mounting is detected from a state in which the sensor does not detect the lens unit mounting, and the lens mount opening. Is in an open state.

  In addition, the present invention relates to the above-described imaging device, and when a power-off operation of the imaging device is performed, the blocking mechanism closes the lens mount opening and then turns off the imaging device. Features.

  The present invention also relates to the above-described imaging apparatus, wherein the blocking mechanism opens the opening of the lens mount even when the lens unit is not mounted when the imaging device is cleaned. And

  The present invention also relates to the above-described imaging apparatus, wherein the drive source switching means connects the drive means to either the shutter or the shut-off mechanism.

  The present invention also relates to the above-described imaging apparatus, wherein the drive source switching means comprises a planetary gear train that switches between a state in which the driving force of the drive means is transmitted to the shutter and a state in which the drive force is transmitted to the blocking mechanism. It is characterized by that.

  The present invention also relates to the above-described imaging apparatus, wherein the drive source switching means includes a switch for switching the driving force of the driving means to either the state of transmitting to the shutter or the state of transmitting to the blocking mechanism. Features.

  The present invention also relates to the above-described imaging apparatus, wherein the switch is a magnet switch.

  The present invention also relates to the imaging apparatus described above, wherein the driving means is an electric motor.

  The present invention also relates to an interchangeable lens camera, a lens mount to which a lens unit is detachably mounted, an image sensor that outputs an image signal corresponding to subject light received through the lens unit, The image sensor has a shutter for capturing the subject light and a driving means for operating the shutter. The image sensor is disposed between the lens mount and the image sensor, and opens or closes the opening of the lens mount according to the attachment / detachment of the lens unit. And a drive source switching means for operating the shut-off mechanism by the driving means.

  ADVANTAGE OF THE INVENTION According to this invention, mixing of the foreign material at the time of lens replacement | exchange can be prevented, reducing a lens interchangeable imaging device small.

It is a functional block diagram which shows the example of the imaging device which concerns on this invention. It is a longitudinal cross-sectional view which shows the example of the internal structure of the said imaging device. It is a schematic diagram which shows the operation example of a shutter part when the inside of the said imaging device is seen from the lens mount side. It is a schematic diagram which shows the operation example of the barrier part when the inside of the said imaging device is seen from the lens mount side. It is a schematic diagram which shows the example of a drive part with which the said imaging device is equipped, a transmission part, a switching part, and the operation example of each part. It is a schematic diagram which shows the example of a drive part with which the said imaging device is equipped, a transmission part, a switching part, and the operation example of each part. It is a schematic diagram which shows another example of the drive part with which the said imaging device is equipped, a transmission part, and a switching part, and the operation example of each part. It is a schematic diagram which shows another example of the drive part with which the said imaging device is equipped, a transmission part, and a switching part, and the operation example of each part.

  Hereinafter, embodiments of an imaging apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram illustrating an example of an imaging apparatus according to the present invention. In FIG. 1, an imaging device 10 includes a CPU 1, a drive unit 2, a transmission unit 3, a barrier unit 4, a shutter unit 5, a switching unit 6, a lens attachment / detachment sensor 7, a cleaning mode switch 8, a power source. And a switch 9.

  The CPU 1 performs overall operation control of the imaging device 10. Various operations to be described later are executed by the CPU 1 executing a control program (not shown) and controlling the operation of each mechanism in the imaging apparatus 10.

  The drive unit 2 is, for example, an electric motor, and the rotation operation, stop, and rotation direction are controlled by the CPU 1. The operation of the transmission unit 3 is performed by the operation of the driving unit 2. That is, the rotation direction of each gear in the gear box constituting the transmission unit 3 is also determined according to the rotation direction of the drive unit 2.

  The transmission unit 3 has a structure for transmitting kinetic energy generated by the operation (shaft rotation) of the drive unit 2 to the barrier unit 4 or the shutter unit 5. The transmission unit 3 includes, for example, a planetary gear train, and the planetary gear train rotates in contact with the rotational operation portion of the drive unit 2, and this rotational motion is arranged in a subsequent stage via a plurality of gears, Alternatively, it is transmitted to the shutter unit 5.

  The barrier unit 4 includes a barrier that blocks the opening of the mount on which the lens unit is mounted and the inside of the imaging device 10 when a lens unit (not shown) is removed from the imaging device 10, and an operating mechanism of the barrier. . The barrier unit 4 operates when the kinetic energy of the driving unit 2 is transmitted by the transmission unit 3. The structure of the barrier unit 4 will be described later.

  The shutter unit 5 is a mechanism for performing an operation necessary for the image sensor to output an image signal corresponding to the subject light, and a focal plane shutter that performs a predetermined operation according to the exposure amount and an operation of the focal plane shutter. It consists of a mechanism. When a shutter switch (not shown) is operated, the CPU 1 issues an “imaging operation command”. In response to this, the kinetic energy of the drive unit 2 is transmitted to the shutter unit 5 via the transmission unit 3, and the shutter unit 5 operates.

  The focal plane shutter consists of two thin curtains, a front curtain and a rear curtain. During the so-called live view display operation, the front curtain is located at the lower end of the light receiving surface of the image sensor, and the rear curtain is the light receiving surface of the image sensor. It is located at the upper end and remains in a state that does not block the light receiving surface. When an imaging operation command is generated from the CPU 1, the kinetic energy of the drive unit 2 is transmitted to the shutter unit 5 via the transmission unit 3. In response to this kinetic energy, the front curtain rises from below to cover the light receiving surface. This operation is called “shutter charge”. Thereafter, the front curtain falls from the top to the bottom, and after the front curtain starts to fall, the rear curtain falls with a time difference corresponding to the exposure amount calculated in advance. Subject light is received on the light receiving surface by the time difference between the fall of the front curtain and the rear curtain. The exposure amount is secured by this time difference. After the trailing curtain has fallen down, the state is maintained until the image sensor outputs an image signal. After the output of the image signal is finished, the trailing curtain receives the kinetic energy of the drive unit 2 and Return to the top of the image sensor again.

  The switching unit 6 includes a mechanism that switches the operation of the transmission unit 3 in response to a command from the CPU 1 and switches the destination to which the kinetic energy of the driving unit 2 is transmitted to the barrier unit 4 or the shutter unit 5. The detailed configuration of the switching unit 6 will be described later.

  The lens attachment / detachment sensor 7 is a sensor that detects whether or not an interchangeable lens is attached to the imaging device 10. The lens attachment / detachment sensor 7 includes, for example, a switch disposed on the lens mount of the imaging device 1 and a sensor that detects the state of the switch.

  The cleaning mode switch 8 is a switch for selecting a “cleaning mode” for cleaning the inside of the imaging apparatus 10. By operating the cleaning mode switch 8, switching between the cleaning mode and the normal mode is performed.

  The power switch 9 is a switch for switching on and off the operating power of the imaging apparatus 10. The operation start and end of the imaging device 10 are switched by operating the power switch 9.

  Next, the operation of the imaging apparatus 10 according to the present embodiment will be described in detail. When the lens unit is removed and the power supply is turned off, the imaging device 10 blocks the opening of the mount without exposing the inside of the imaging device 10 by a barrier curtain described later that the barrier unit 4 has. It is in a state (closed state). At this time, the transmission unit 3 is in a state of operating the barrier unit 4 side by the switching unit 6. For example, the planetary gear train as the transmission means 3 is in a state of being connected so as to operate the cam member that opens and closes the barrier curtain related to the barrier unit 4. The position of this cam is detected by a photo interrupter (PI: Photo Interrupter), and it can be detected whether the barrier curtain is open or closed. With this PI, the barrier curtain is kept closed as will be described later. When the imaging apparatus 10 is in the above state, the barrier curtain remains closed even when the power switch 9 is operated and the power is turned on.

  Next, an operation when the imaging lens is attached while the power of the imaging apparatus 10 is on will be described. First, the barrier curtain is closed when the power is on and the imaging lens is not attached. Here, when the imaging lens is attached, the lens attaching / detaching sensor 7 detects the lens attachment and transmits it to the CPU 1. The CPU 1 operates the driving unit 2 and operates the barrier unit 4 via the transmission unit 3 to open the barrier curtain. Next, the CPU 1 instructs the switching unit 6 to switch the transmission unit 3 to the shutter unit 5 side.

  Next, an operation when an imaging operation is performed will be described. The imaging operation refers to a predetermined operation for photographing a subject, for example, an operation of pressing a shutter switch. When an imaging operation is performed, the CPU 1 operates the drive unit 2 and operates the shutter unit 5 via the transmission unit 3. The operation of the shutter unit 5 is as described above.

  Next, the operation when the imaging lens is removed with the power turned on will be described. When the imaging lens is removed, the lens attaching / detaching sensor 7 notifies the CPU 1 of that fact. The CPU 1 instructs the switching unit 6 to switch the transmission unit 3 from the shutter unit 5 side to the barrier unit 4 side. Thereafter, the CPU 1 instructs the driving unit 2 to operate, the kinetic energy of the driving unit 2 is transmitted to the barrier unit 4 via the transmission unit 3, and the barrier curtain is closed. As a result, the opening (mounting opening) of the imaging device 10 is blocked, and it is possible to prevent the inside of the imaging device 10, particularly the imaging element from being exposed.

  Next, the operation when the cleaning mode switch 8 is operated will be described. If the transmission unit 3 is on the barrier unit 4 side when the cleaning mode switch 8 is operated, the CPU 1 operates the drive unit 2 as it is to open the barrier curtain. If the transmission unit 3 is not on the barrier unit 4 side but on the shutter unit 5 side, the CPU 1 instructs the switching unit 6 to switch the transmission unit 3 to the barrier unit 4 side, and then operates the driving unit 2. Open the barrier curtain. When the cleaning mode switch 8 is operated again, the CPU 1 operates the drive unit 2 and closes the barrier curtain.

  Next, the operation when the power switch 9 is operated and the power is turned off will be described. When the power is turned off by operating the power switch 9, if the transmission unit 3 is on the barrier unit 4 side, the CPU 1 operates the driving unit 2 and closes the barrier curtain before turning off the power. If the transmission unit 3 is not on the barrier unit 4 side, the CPU 1 instructs the switching unit 6 to switch the transmission unit 3 to the barrier unit 4 side, and then operates the drive unit 2 to close the barrier curtain. Then turn off the power. In this way, even if the lens unit is removed when the power is off, the barrier curtain is always closed, so that foreign matter can be prevented from entering the imaging device 10.

  Next, when the power switch 9 is operated to turn on the power of the imaging device 10, the CPU 1 first detects the mounting state of the imaging lens by the lens attachment / detachment sensor 7. If the imaging lens is mounted, an operation instruction is given to the drive unit 2 and the barrier unit 4 is operated via the transmission unit 3 to open the barrier curtain. Thereafter, the CPU 1 instructs the switching unit 6 to switch the transmission unit 3 from the barrier unit 4 side to the shutter unit 5 side.

  Next, an example in which the cleaning mode switch 8 is operated to operate in the cleaning mode when the imaging lens is detached and the power is off will be described. First, the power is turned on by operating the cleaning mode switch 8. Next, the driving unit 2 is operated to open the barrier curtain. When the cleaning mode switch 8 is operated again, the power is turned off after the barrier curtain is closed.

  Next, an example of the internal structure of the imaging device 10 will be described with reference to FIG. FIG. 2 is a longitudinal sectional view of the imaging device 10 cut along the optical axis direction of the lens. In FIG. 2, a lens unit 20 attached to the imaging device 10, a lens mount 71 to which the lens unit 20 is attached, an imaging element 11, a barrier curtain 41 constituting the barrier unit 4, and a shutter unit 5 are constituted. An example of the shutter curtain 51, the drive motor 21 constituting the drive unit 2, and the transmission unit 3 is illustrated. Although not shown, the lens attachment / detachment sensor 7 is provided on the lens mounting surface of the lens mount 71.

  In FIG. 2, the barrier curtain 41 is installed on the back side of the lens mount 71 (the side opposite to the side on which the lens unit 20 is mounted) and is connected to the transmission unit 3. The shutter curtain 51 is installed on the front side of the image sensor 11 and is connected to the transmission unit 3. As shown in FIG. 2, since the imaging device 10 can operate the barrier unit 4 and the shutter unit 5 by using the driving unit 2 in common, a dedicated drive source is mounted on each of the barrier unit 4 and the shutter unit 5. Therefore, the imaging apparatus 10 can be downsized.

  Here, the operation of the shutter unit 5 will be described with reference to FIG. FIG. 3 is a schematic diagram illustrating an operation example of the shutter unit 5 when the inside of the imaging device 10 is viewed from the lens mount 71 side. In FIG. 3, the shutter unit 5 includes a shutter curtain 51 including a front curtain 51a and a rear curtain 51b disposed on the front surface of the image sensor 11, a charge mechanism 52 that moves the shutter curtain 51 to predetermined positions, and a shutter. And a magnet drive unit 53 that maintains the curtain 51 in a predetermined position. The charging mechanism 52 includes a spring member that urges the front curtain 51a and the rear curtain 51 in a direction opposite to the charging direction.

  FIG. 3A shows an example of a live view operation state. The front curtain 51 a is near the lower end of the image sensor 11, and the rear curtain 51 b is near the upper end of the image sensor 11. As a result, subject light is imaged on the light receiving surface of the image sensor 11 via a lens unit (not shown), and the subject image continues to be displayed on an image display unit (not shown) at a predetermined timing.

  When the shutter curtain 51 is in the state of FIG. 3A, the rear curtain 51 b is pushed up to the upper end by the charge mechanism 52. The rear curtain 51b is urged downward by a spring member (not shown), but is held at the upper end position by the magnet driving unit 53.

  When the shutter button is operated from the state of FIG. 3A to perform imaging processing, the front curtain 51a is moved from the bottom to the top by the charge mechanism 52 as shown in FIG. 3B. Since the front curtain 51a is also biased downward by the spring member, when the front curtain 51a moves to a state where it covers the light receiving surface of the image sensor 11, it is held at the upper part by the magnet drive unit 53.

  Thereafter, as shown in FIG. 3C, first, a magnet (not shown) of the magnet driving unit 53 holding the front curtain 51a is turned off, and the front curtain 51a is dropped by the bias of the spring member. Thereafter, the magnets of the magnet drive unit 53 holding the rear curtain 51b are turned off at different times so as to form a gap corresponding to a predetermined exposure time. The state in which the trailing curtain 51b has fallen is maintained until an image signal is output from the image sensor 11 and predetermined image processing is performed. Thereafter, the rear curtain 51b moves to the upper end of the image sensor 11 and returns to a state where the image sensor 11 can receive light (FIG. 3A). The charge mechanism 52 in this series of operations is configured by the drive unit 2 and the transmission unit 3. The state of the shutter curtain 51 is detected by the PI.

  Next, an operation example of the barrier unit 4 will be described with reference to FIG. FIG. 4 is a schematic diagram illustrating an operation example of the barrier unit 4 when the inside of the imaging device 10 is viewed from the lens mount 71 side. 4, the barrier unit 4 includes a barrier curtain 41 and a charge mechanism 42 that moves the barrier curtain 41 to a predetermined position. FIG. 4A shows an example of a state in which the barrier curtain 41 that is a blocking mechanism is opened. In FIG. 4A, the barrier curtain 41 is held by the charge mechanism 42 at a position where the light receiving surface of the image sensor 11 is not hidden. Since the charging mechanism 42 includes a spring member that urges the barrier curtain 41 in the direction opposite to the charging direction, the barrier curtain 41 stays at a predetermined position by driving the charging mechanism 42 upward. When the driving force of the mechanism 42 is lost, the light receiving surface of the image sensor 11 is covered by the spring member as shown in FIG. Whether the barrier curtain 41 is open or closed is detected by the PI.

  Next, operation examples of the drive unit 2, the transmission unit 3, and the switching unit 6 will be described with reference to FIGS. FIG. 5 is an example of a state in which the driving force of the driving unit 2 is transmitted to the shutter unit 5 via the transmission unit 3 by the switching unit 6. FIG. 6 is an example of a state in which the driving force of the driving unit 2 is transmitted to the barrier unit 4 via the transmission unit 3 by the switching unit 6.

  FIG. 5A is a schematic diagram showing an example in which the drive unit 2, the transmission unit 3, and the switching unit 6 are viewed from a direction orthogonal to the rotation axis of the drive unit. FIG. 5B is a schematic diagram showing an example in which the drive unit 2, the transmission unit 3, and the switching unit 6 are viewed from the rotation axis of the drive unit. In FIG. 5A, a gear 100 is attached to the rotation shaft of the motor 21 that constitutes the drive unit 2. The rotation direction of the gear 102 that rotates in response to the rotation of the gear 100 and the gear 103 that rotates in response to the rotation of the gear 102 are opposite. A gear 104 is connected to the gear 103 via a rod-like connecting member 101. The rotation direction of the gear 104 is opposite to the rotation direction of the gear 103. One end of the connecting member 101 is fixed to the gear 103, and the other end of the connecting member 101 is fixed to the gear 104.

  As shown in FIG. 5B, when the gear 100 rotates in the clockwise direction, the gear 102 rotates in the counterclockwise direction. The gear 103 that rotates in response to the rotation of the gear 102 rotates in the clockwise direction. The gear 103 and the gear 104 are connected to each other at the rotation center by the connecting member 101, and the gears 103 are rotated in the clockwise direction because the gears 104 are rotated by receiving the rotation of the gear 103. When rotated, the fixed side with respect to the gear 104 (the other end side of the connecting member 101) rotates around the fixed side of the connecting member 101 with the gear 103 (one end side of the connecting member 101). In accordance with the rotation of the connecting member 101, the gear 104 fixed to the other end side of the connecting member 101 rotates around a fixed point where the connecting member 101 and the gear 103 are fixed. As described above, the gear 104 rotates around the rotation axis of the gear 104 along with the rotation of the gear 103, and moves around the gear 103 as the connection member 101 rotates along with the rotation of the gear 103. It is configured to be rotatable.

  The gear 105 and the gear 106 constitute a part of the shutter unit 5. The gear 105 is positioned at a position where it is connected to the gear 104 when the gear 104 rotates around the gear 103, receives the rotation of the gear 104 itself, and the rotation direction of the gear 104 itself about the rotation axis of the gear 105. It is configured to be rotatable in the reverse direction. The gear 106 is configured to be rotatable in the direction opposite to the rotation direction of the gear 105 in response to the rotation of the gear 105. In FIG. 5, the gear 100 and the gear 103 rotate clockwise (clockwise in the drawing), and as a result, the gear 104 rotates clockwise around the gear 103 and is connected to the gear 105. ing. Here, the gear 105 and the gear 106 are connected to a charge mechanism 52 (not shown). Therefore, when the gear 104 and the gear 105 are connected, the shutter unit 5 is in a state of operating.

  On the other hand, the gear 107 and the gear 108 shown in FIG. 6 are connected to a charge mechanism 42 (not shown) constituting the barrier unit 4. In FIG. 6A, the gear 100 rotates counterclockwise. If it does so, the gear 103 will also rotate counterclockwise. As a result, as shown in FIG. 6B, the gear 104 rotates in the counterclockwise direction around the gear 103 and is connected to the gear 107. At this time, the gear 107 rotates counterclockwise in the direction opposite to the rotation direction of the gear 104, and the gear 108 connected to the gear 107 rotates in the clockwise direction opposite to the rotation direction of the gear 107. Thus, when the gear 104 and the gear 107 are connected, the barrier unit 4 is in a state of operating.

  As described above, the gear 105 and the gear 107 are positioned and fixed at positions where they can be connected when the gear 104 rotates around the gear 103. Whether the gear 104 is connected to the gear 105 or the gear 107 is determined by the rotation direction of the gear 104 that rotates around the gear 103, that is, the rotation direction of the motor 21 that determines the rotation direction of the gear 103. Therefore, the imaging apparatus 10 can control the gear 104 to be connected to either the gear 105 or the gear 107 by controlling the rotation direction of the motor 21. That is, the imaging apparatus 10 can control which of the barrier unit 4 and the shutter unit 5 is operated by controlling the rotation direction of the motor 21.

  That is, the transmission unit 3 is a gear 100 that is attached to the rotation shaft of the motor 21 that is the drive unit 2 and a gear that is a planetary gear train that is connected to the gear 100 and transmits the rotation (kinetic energy) of the motor 21. 102, a gear 103, and a gear 104.

  The switching unit 6 includes a CPU 1 that controls the rotation of the motor 21, a motor 21, a gear 100, a planetary gear train, a gear 102, a gear 103, a gear 104, and a connecting member 101.

  According to the embodiment described above, the operating mechanism that operates the barrier unit 4 that prevents foreign matter from entering the imaging apparatus 10 when the lens is not mounted, and the shutter unit 5 that performs imaging are operated. The operation mechanism can be shared. As a result, it is not necessary to provide a dedicated operation mechanism for each of the barrier unit 4 and the shutter unit 5, and foreign objects can be prevented from being mixed during lens replacement while reducing the size of the imaging device 10.

  Next, another embodiment of the imaging apparatus according to the present invention will be described with a focus on differences from the above-described embodiment. The present embodiment is different from the above-described embodiment in that the transmission unit and the switching unit are configured by magnet switches. FIG. 7 is a diagram illustrating an example of a switching unit and a transmission unit included in the imaging apparatus 10 according to the present embodiment. In FIG. 7, a gear 100 is attached to the rotation shaft of the motor 21 constituting the drive unit 2. A gear 103a and a gear 103b are connected to a gear 102a that is connected to the gear 100 and rotates. When the motor 21 rotates, the gear 103a and the gear 103b rotate in the same direction.

  The magnet switch 61 constituting the switching unit moves the rod-shaped arm 101a according to an operation instruction from the CPU 1. One end of the arm 101a is fixed to the magnet switch 61, and the other end of the arm 101a is fixed to the gear 104a. The arm 101a moves around the fixed point with the magnet switch 61 so that the gear 104a rotates around the fixed point. Here, the movement of the arm 101 a is realized by turning the magnet switch 61 on and off. FIG. 7 shows a state where the gear 104 a has moved to a position where it is connected to the gear 105 when the magnet switch 61 is off. Since the gear 105 is connected to the shutter unit 5, the shutter unit 5 operates when the magnet switch 61 is off.

  On the other hand, FIG. 8 shows a state where the gear 104a has moved to a position where it is connected to both the gear 103b and the gear 106 when the magnet switch 61 is on. Here, since the gear 107 is connected to the barrier unit 4, the barrier unit 4 operates when the magnet switch 61 is on.

  As described above, the transmission unit is connected to the gear 100 attached to the rotation shaft of the motor 21 that is the driving unit 2, and the gear 102a that is a planetary gear train that transmits the rotation (kinetic energy) of the motor 21. The gear 103a, the gear 103b, and the gear 104a are comprised. The switching unit is composed of a magnet switch 61, an arm 101a, and a gear 104a.

    According to the embodiment described above, the operating mechanism that operates the barrier unit 4 that prevents foreign matter from entering the imaging apparatus 10 when the lens is not mounted, and the shutter unit 5 that performs imaging are operated. The operation mechanism can be shared. As a result, since it is not necessary to provide a dedicated operation mechanism for each of the barrier unit 4 and the shutter unit 5, it is possible to reduce the size of the imaging device 10 and prevent foreign matters from being mixed during lens replacement.

  As described above, according to the imaging apparatus according to the present invention, the mechanism for operating the shut-off curtain for preventing foreign matter from entering inside when the lens is not attached is shared with the shutter operating mechanism. Thus, a space required when a dedicated operation mechanism is provided can be omitted, and the imaging apparatus can be reduced in size.

1 CPU
2 Driving unit 3 Transmission unit 4 Barrier unit 5 Shutter unit 6 Switching unit 7 Lens attachment / detachment sensor 8 Cleaning mode switch 9 Power switch

JP 2007-183483 A

Claims (15)

A lens mount on which the lens unit is detachably mounted;
An imaging device comprising: an imaging device that outputs an image signal according to subject light received through the lens unit; a shutter for the imaging device to capture the subject light; and a driving unit that operates the shutter. A device,
A sensor for detecting whether or not the lens unit is mounted on the lens mount;
A blocking mechanism that is disposed between the lens mount and the imaging device and opens or closes the opening of the lens mount in accordance with the attachment / detachment of the lens unit;
Drive source switching means for operating the shut-off mechanism by the drive means;
An image pickup apparatus comprising: A sensor for detecting whether or not the lens unit is mounted on the lens mount;
2. The image pickup apparatus according to claim 1, wherein the drive source switching unit operates the blocking mechanism by the drive unit when the sensor does not detect mounting of the lens unit.   2. The imaging apparatus according to claim 1, wherein the blocking mechanism closes the opening of the lens mount when the sensor does not detect the mounting of the lens unit.   The imaging apparatus according to claim 1, wherein the blocking mechanism shields between the lens mount and the imaging element when the sensor does not detect mounting of the lens unit.   The imaging apparatus according to claim 1, wherein the sensor electrically detects mounting of the lens unit.   The shut-off mechanism closes the opening of the lens mount when the sensor no longer detects mounting of the lens unit from a state where the sensor detects mounting of the lens unit. Item 2. The imaging device according to Item 1.   The blocking mechanism operates when the mounting of the lens unit is detected from the state where the sensor does not detect the mounting of the lens unit, and opens the opening of the lens mount. The imaging apparatus according to claim 1.   The imaging apparatus according to claim 1, wherein when the power of the imaging apparatus is turned off, the shut-off mechanism turns off the imaging apparatus after closing the opening of the lens mount.   2. The imaging apparatus according to claim 1, wherein the blocking mechanism opens the opening of the lens mount even when the lens unit is not mounted when the imaging device is cleaned.   The imaging apparatus according to claim 1, wherein the drive source switching unit connects the drive unit to one of the shutter and the blocking mechanism.   2. The planetary gear train according to claim 1, wherein the drive source switching means comprises a planetary gear train that switches between a state in which the driving force of the drive means is transmitted to the shutter and a state in which the drive force is transmitted to the blocking mechanism. Imaging device.   2. The imaging apparatus according to claim 1, wherein the drive source switching unit includes a switch for switching a driving force of the driving unit between a state of transmitting to the shutter and a state of transmitting the driving force to the blocking mechanism. .   The imaging apparatus according to claim 12, wherein the switch is a magnet switch.   2. The image pickup apparatus according to claim 1, wherein the driving means is an electric motor. A lens mount on which the lens unit is detachably mounted;
An image sensor that outputs an image signal according to subject light received through the lens unit;
A shutter for the image sensor to capture the subject light;
Driving means for operating the shutter;
A camera equipped with
A blocking mechanism that is disposed between the lens mount and the imaging device and opens or closes the opening of the lens mount in accordance with the attachment / detachment of the lens unit;
Drive source switching means for operating the shut-off mechanism by the drive means;
An interchangeable lens camera characterized by comprising:

Images