JP2009151117A - Imaging apparatus, control method of imaging apparatus, lens device, control method of lens device, and imaging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a camera system in which a lens device driving an optical element according to the specification of imaging processing is detachably attached to a camera body, which cuts off the supply of power at the moment when the attachable and detachable lens device is detached from the camera body. <P>SOLUTION: The lens device 110 includes: a connection terminal 213 which is electrically connected to the camera body 100; and a connection informing and specification receiving part 510 which informs the camera body 100 of the completion of electrical connection through the connection terminal 213 and receives the information on the specification transmitted through the connection terminal 213. The camera body 100 includes: a connection terminal 203 which is electrically connected to the connection terminal 213 provided on the side of the lens device 110; and a connection informing and specification transmitting part 440 which detects the completion of electrical connection to a lens driving part 500 through the connection terminal 203 and transmits the information on the specification to the lens driving part 500 through the connection terminal 213. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an imaging device in which a lens is detachable, a control method for the imaging device, a lens device that is detachable from the imaging device, a control method for the lens device, and an imaging system in which the imaging device and the lens are detachable. It is.

  Some camera apparatuses that capture an image of a subject are detachably mounted with a lens depending on the application. When a single sensor detects that a lens is attached, even when the lens is incompletely attached, a voltage is applied to the power supply terminal that supplies power to the lens, or a lens failure occurs due to a sensor failure. There is a possibility that a voltage may be applied to the power supply terminal even though it is not attached.

  In Patent Document 1, a plurality of detection means for detecting lens attachment are arranged on a joint surface for attaching a lens, and when all of these detection means detect that the lens is attached, a power supply terminal A television camera is described in which a voltage is reliably applied to a power supply terminal when a lens is not attached by applying a voltage to the power supply terminal.

  In Patent Document 2, the operation of the lens is controlled by communicating with the lens, and when the communication with the lens cannot be performed for a predetermined time, the power supply is cut off so that the lens is A camera system is described that ensures that no voltage is applied to a power supply terminal when it is not attached.

JP-A-10-271366 JP-A-7-253608

  By the way, some image pickup apparatuses in which a lens can be attached and detached perform control such as focus and diaphragm of a lens according to the specification of image pickup processing such as a period of a vertical synchronization signal. In such an image pickup apparatus, a large number of terminals for performing communication are necessary on the joint surface between the lens and the image pickup apparatus.

  In an imaging system in which a lens device that drives an optical element in accordance with the specifications of such imaging processing is detachably attached to the imaging device, a joint surface is provided like the television camera described in Patent Document 1 described above. It is difficult to provide a plurality of detection means for detecting the mounting of the lens, and even if it is realized, it is necessary to save space on the joint surface, which increases the cost because a large number of parts are arranged.

  Further, in the camera system described in Patent Document 2, it takes a predetermined time to cut off the power supply, and when the lens is removed from the camera body, the voltage is not instantaneously applied to the power supply terminal. I couldn't do it.

  The present invention has been proposed in view of such circumstances, and in an imaging system in which a lens device that drives an optical element according to the specifications of imaging processing is detachably attached to the imaging device, at low cost, An object of the present invention is to provide an imaging apparatus, an imaging apparatus control method, a lens apparatus, a lens apparatus control method, and an imaging system that instantaneously cut off power supply when a detachable lens apparatus is removed from the imaging apparatus. To do.

  As a means for solving the above-described problems, an imaging apparatus according to the present invention includes a lens apparatus that includes a driving unit that drives an optical element in accordance with imaging processing specifications. A connection terminal electrically connected to the built-in drive means, a connection detection means for detecting that the drive means built in the lens device is electrically connected via the connection terminal, and detection by the connection detection means Based on the result, information on the specification is transmitted to the drive means built in the lens device via the control means for supplying power to the drive means built in the lens device and the connection terminal used for the connection detection means. Specification transmission means.

  The imaging apparatus control method according to the present invention includes a lens apparatus that includes a driving unit that drives an optical element in accordance with the specifications of the imaging process. A connection detection step for detecting that the drive means built in the apparatus is electrically connected; and a power supply step for supplying power to the drive means built in the lens device based on a detection result of the connection detection step. And a specification transmission step of transmitting information relating to the specification to the driving means built in the lens device via the connection terminal used in the connection detection step.

  Further, in the lens device according to the present invention, in the lens device detachable from the imaging device, a connection terminal electrically connected to the imaging device, and an electrical connection to the imaging device via the connection terminal, A connection notifying means for notifying the imaging apparatus, a driving means for driving the optical element by a power source supplied from the imaging apparatus notifying that the connection notifying means is electrically connected, and a connection terminal used for the connection notifying means. Specification receiving means for receiving information relating to the specification of the imaging apparatus transmitted via the drive, and the driving means drives the optical element in accordance with the information relating to the specification received by the specification receiving means.

  The lens device control method according to the present invention includes a connection notification for notifying the imaging device that the imaging device is electrically connected via the connection terminal in the lens device control method detachable from the imaging device. A drive step for driving the optical element by a power source supplied from the imaging device that has notified that the connection notification step is electrically connected, and an imaging transmitted through the connection terminal used in the connection notification step A specification receiving step for receiving information relating to the specification of the apparatus, and in the driving step, the optical element is driven in accordance with the information relating to the specification received in the specification receiving step.

  An imaging system according to the present invention is an imaging system including an imaging device and a lens that is detachable from the imaging device. The lens device is connected to a connection terminal that is electrically connected to the imaging device, and the connection terminal. A connection notifying unit for notifying the imaging device that the imaging device is electrically connected, and a drive for driving the optical element by a power source supplied from the imaging device that has notified that the connection notification unit is electrically connected. And a specification receiving means for receiving information relating to the specification of the imaging device transmitted via the connection terminal used for the connection notifying means, and the driving means includes information relating to the specification received by the specification receiving means. The optical device is driven accordingly, and the imaging device is electrically connected to the driving means of the lens device via the connection terminal and the connection terminal electrically connected to the driving means of the lens device Information on the specification via a connection detecting means for detecting that it has been detected, a control means for supplying power to the driving means of the lens device based on a detection result by the connection detecting means, and a connection terminal used for the connection detecting means. It has the specification transmission means transmitted to the specification reception means of a lens apparatus, It is characterized by the above-mentioned.

  In the present invention, the connection terminal for detecting that the driving unit incorporated in the imaging apparatus and the lens apparatus is connected is also used as a terminal for transmitting and receiving information relating to the specifications of the imaging apparatus to the lens apparatus side. At the same time, since power is supplied to the drive means built in the lens device based on the detection result using the connection terminal, the processing for instantaneously shutting off the power supply when the lens device is removed from the imaging device is realized at low cost. be able to.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. An imaging apparatus to which the present invention is applied is an imaging apparatus in which a lens that operates in accordance with imaging processing specifications is detachable. The best mode for carrying out the present invention using a camera system 1 corresponding to the imaging system according to the present invention as shown in FIGS. 1 and 2 will be described below. Here, FIG. 1A is a front view of the camera system 1, and FIG. 1B is a rear view of the camera system 1. 2A is a left side view of the camera system 1, FIG. 2B is a right side view of the camera system 1, and FIG. 2C is a plan view of the camera system 1.

  The camera system 1 includes a camera body 100 corresponding to the imaging device according to the present invention, and a lens device 110 corresponding to the lens device according to the present invention detachably attached to the camera body 100.

  The camera body 100 is an image pickup processing device that picks up a subject image collected by a lens device 110 (to be described later) and generates an image signal. In this case, a cable connection unit 101, a recording medium storage unit 102, An external media connection unit 103, an operation input unit 104, a microphone 105, a display unit 108 including a display finder 106 and a display panel 107, and a mount unit 109 are provided.

  For example, a cable for supplying power or a cable for transmitting a video signal or an audio signal is connected to the cable connection unit 101. The camera body 100 receives power supply from the outside via the cable connection unit 101 or outputs a video signal or an audio signal to an external display device (not shown).

  The recording medium storage unit 102 stores a recording medium such as a magnetic recording tape that records an image signal captured by the camera body 100.

  The external media connection unit 103 connects recording media other than the recording media stored in the above-described recording media storage unit 102, such as a hard disk drive or a flash memory drive, via a shoe. The camera body 100 supplies an image signal to the external media via the external media connection unit 103.

  The operation input unit 104 includes a plurality of switches, buttons, and the like. For example, an operation command such as power on / off of the camera body 100, switching between an imaging mode and a video playback mode, and a setting change related to imaging processing and audio processing is received from the user. Entered.

  The microphone 105 collects sound and converts the collected sound into an electrical signal as an audio signal. The audio signal converted by the microphone 105 is subjected to predetermined processing by an audio processing unit provided in the camera body 100 (not shown), and is connected by a recording medium stored in the recording medium storage unit 102 or an external media connection unit 103. Recorded on recording media.

  The display unit 108 includes a display finder 106 and a display panel 107 that can be stored. The display finder 106 and the display panel 107 are, for example, a liquid crystal display finder, a liquid crystal display panel, and the like, and display images captured by the camera body 100. The angle of view of the image captured by the camera body 100 is determined by the user when the captured image displayed on the display finder 106 or the display panel 107 is visually recognized by the user. Further, the display finder 106 and the display panel 107 display setting information related to the camera body 100 so as to be visible to the user.

  Further, the display unit 108 is provided with a plurality of switches and buttons (not shown) in a storage unit in which the display panel 107 is stored. In the camera body 100, for example, operation commands such as reproduction, rewinding, and fast-forwarding of image data recorded on the magnetic recording tape stored in the recording medium storage unit 102 are input from the user via the switches and buttons. The

  The mount part 109 is provided in the front part of the camera body 100, and is a part to which a lens device 110 described later is detachably attached. In the camera body 100 according to the present embodiment, the lever provided on the mount unit 109 is rotated by the user in order to prevent an unexpected attachment / detachment operation in a state where the lens device 110 is mounted via the mount unit 109. Thus, the lens device 110 is tightened.

  The camera body 100 configured as described above is equipped with a battery 120 for supplying power as an operation source to the back surface portion thereof.

  Since the lens device 110 condenses light from the subject on an image sensor provided inside the housing of the camera body 100 to which the lens device 110 is attached, a plurality of optical elements are provided inside the housing. . In addition, the lens device 110 is provided with a focus ring 111, a zoom ring 112, an iris ring 113, and a zoom control lever 114 on the outside of the casing. Further, the lens device 110 incorporates a lens driving unit 500 described later, and drives each optical element by the lens driving unit 500.

  The focus ring 111 is rotated by the user, and focus position information corresponding to the rotation angle is detected by a focus ring sensor 540 described later. The zoom ring 112 is rotated by the user and supplies zoom position information corresponding to the rotation angle to the lens driving unit 500. The iris ring 113 is rotated by the user and supplies aperture value information corresponding to the rotation angle to the lens driving unit 500. In addition, the zoom control lever 114 supplies zoom position information corresponding to the pressing operation by the user to the lens driving unit 500.

  Next, a joint surface between the lens device 110 and the mount portion 109 of the camera body 100 that is detachably attached to the lens device 110 will be described with reference to FIG.

  FIG. 3A is a view showing the joint surface 200 of the mount portion 109.

  The joint surface 200 of the mount 109 has a concentric shape having a protective glass 204 at the center, and is a connection terminal composed of a plurality of connection terminals for electrical connection with the lens driving unit 500 built in the lens device 110. Groups 201 and 202 and a pressing switch 205 that is pressed when the lens device 110 is tightened by rotating a lever provided on the mount unit 109 are provided. Note that the pressing switch 205 may not be pressed by rotating the lever described above as long as it is pressed when the lens device 110 is mounted.

  The connection terminal group 201 includes a plurality of connection terminals for supplying power to the lens driving unit 500 built in the mounted lens device 110.

  The connection terminal group 202 includes connection terminals connected to a control line for controlling the operation of the lens driving unit 500 built in the mounted lens device 110.

  The connection terminal 203 in the connection terminal group 202 is a connection terminal for transmitting information related to the specifications of the camera body 100 from the camera body 100 to the lens driving unit 500 built in the lens device 110. Specifically, the connection terminal 203 is a terminal for notifying the lens driving unit 500 built in the lens device 110 as to whether the video signal is NTSC or PAL as information relating to the specifications of the camera body 100. Further, as will be described later, the camera body 100 is notified from the lens device 110 side through the connection terminal 203 that the lens driving unit 500 built in the lens device 110 is electrically connected.

  When the video signal is HD, information indicating NTSC indicates information (hereinafter, 60i) including 60 fields per second, and information indicating PAL is configured with 50 fields per second. Information (hereinafter referred to as 50i).

  In addition, several of the connection terminals constituting the connection terminal group 201 and the connection terminal group 202 are grounded. The connection terminal 203 is not limited to the case where it is used as a connection terminal for notifying NTSC (60i for HD) / PAL (50i for HD). It may be a signal for transmitting information relating to the specification of the camera body 100 to the lens device 110 side, such as a signal for permitting or rejecting part of the operation of the lens device 110.

  The pressure switch 205 is pressed when the lens device 110 is attached. The camera body 100 detects that the lens device 110 is mounted as will be described later when the pressing switch 205 is pressed.

  The protective glass 204 is provided in the center part of the joint surface 200, for example, in order to prevent dust etc. from entering the inside. Further, the light collected by the lens device 110 is incident on the protective glass 204. On the extension of the incident direction, an image sensor such as a CCD or a CMOS is disposed.

  The joint surface 210 of the lens device 110 that joins to the joint surface 200 of the mount 109 as described above has a configuration as shown in FIG. That is, the joint surface 210 of the lens device 110 has a concentric shape having a lens group 214 having a shape similar to that of the protective glass 204, and a connection terminal group including a plurality of connection terminals for electrical connection with the camera body 100. 211 and 212 and a pressing portion 215 that presses the above-described pressing switch 205 when mounted on the camera body 100 are provided.

  Each connection terminal constituting the connection terminal group 211 is arranged on the joint surface 210 so as to come into contact with each connection terminal constituting the connection terminal group 201 of the camera body 100 when the camera body 100 is mounted. Yes. That is, in the camera system 1, the connection terminal group 201 on the camera body 100 side and the connection terminal group 211 on the lens apparatus 110 side are electrically connected in contact with each other, whereby the camera apparatus 100 and the lens apparatus 110 are connected. The power is supplied to the lens driving unit 500 built in the camera.

  Each connection terminal constituting the connection terminal group 212 is arranged on the joint surface 210 so as to come into contact with each connection terminal constituting the connection terminal group 202 of the camera body 100 when the camera body 100 is mounted. Yes. Note that the connection terminal 213 in the connection terminal group 212 is disposed at a position in contact with the connection terminal 203 on the camera body 100 side.

  When the pressing unit 215 is attached to the camera body 100, the pressing unit 215 presses a pressing switch 205 provided on the camera body 100 side.

  As described above, when the camera body 100 and the lens device 110 are mounted, the connection terminal provided on the camera body 100 side and the connection terminal provided on the lens device 110 side come into contact with each other electrically. Can be connected.

  In the camera system 1, the camera body 100 includes a processing unit as illustrated in FIG. 4 in order to control the operation of the lens device 110.

  That is, the camera body 100 includes a power supply switch 410, an output switch 420, an input switch 430, a connection detection / specification transmission unit 440, a mounting detection unit 450, and a camera side control unit 460.

  The power supply switch 410 is connected to the connection terminal group 201 including the connection terminals for power supply described above. As will be described later, the power supply switch 410 is controlled to be turned on and off by the camera-side control unit 460, applies a voltage to the connection terminal group 201, and supplies power to the lens driving unit 500 built in the lens device 110. To do.

  The output switch 420 is connected to a connection terminal of a control line that transmits a control signal to the lens device 110 side in the connection terminal group 202 described above. The output switch 420 is controlled to be turned on and off by the camera-side control unit 460 as described later, and supplies a control signal to the lens device 110 side via the connection terminals of the connection terminal group 202.

  The input switch 430 is connected to a connection terminal of a control line that receives a control signal from the lens device 110 side in the connection terminal group 202 described above. As will be described later, the input switch 430 is controlled to be turned on and off by the camera-side control unit 460, and receives a control signal from the lens device 110 side through the connection terminals of the connection terminal group 202.

  The connection detection / specification transmission unit 440 is connected to the connection terminal 203 in the connection terminal group 202 described above, and detects that the lens device 110 is electrically connected via the connection terminal 203. The specification information regarding the camera body 100 is transmitted to the lens apparatus 110. The connection detection / specification transmission unit 440 receives specification information from the camera side control unit 460 and transmits the specification information to the lens device 110 side. Further, the connection detection / specification transmission unit 440 detects that the lens device 110 is electrically connected, and supplies this detection information to the camera side control unit 460.

  The attachment detection unit 450 is connected to the pressing switch 205 and detects that the pressing switch 205 is pressed. The mounting detection unit 450 detects that the lens device 110 is mounted by the pressing operation of the pressing switch 205 and supplies the detection result to the camera-side control unit 460.

  The camera-side control unit 460 controls the power supply switch 410, the output switch 420, and the input switch based on detection results from the connection detection / specification transmission unit 440 and the attachment detection unit 450.

  Further, the camera-side control unit 460 controls on / off of the power supply switch 410, the output switch 420, and the input switch 430 according to the flowchart shown in FIG. Note that the camera-side control unit 460 repeatedly performs the processing according to the flowchart shown in FIG. 5 in synchronization with the vertical synchronization signal VD, for example.

  In step S <b> 1, the camera-side control unit 460 determines whether or not the lens device 110 is mounted from the detection results of the connection detection / specification transmission unit 440 and the mounting detection unit 450.

  Specifically, in order to control the operation of the lens device 110 mounted on the mount unit 109, the camera-side control unit 460 detects that the lens device 110 is mounted by the mounting detection unit 450 and detects connection / Only when the specification transmission unit 440 detects that the lens device 110 is electrically connected via the connection terminal 203, the power supply switch 410, the output switch 420, and the input switch 430 are turned on. Power is supplied to the lens driving unit 500 built in the lens device 110.

  The camera-side control unit 460 supplies power to operate the lens driving unit 500 built in the lens device 110, and as a control signal, for example, a vertical synchronization signal VD of an image signal captured by the camera body 100. Is supplied to the lens driving unit 500. The vertical synchronization signal VD is supplied in this way by changing the focus position, zoom position, and aperture value of the lens apparatus 110 in synchronization with a frame or field that is a unit image. This is desirable.

  The camera-side control unit 460 proceeds to step S2 when determining that the lens device 110 is attached, and proceeds to step S4 when determining that the lens device 110 is not attached.

  In step S2, the camera side controller 460 turns on the power supply switch 410 and proceeds to step S3. That is, the camera-side control unit 460 starts power supply when power is not supplied to the lens driving unit 500 built in the lens device 110, and power is supplied to the lens driving unit 500 built in the lens device 110. Continue to supply power when power is being supplied.

  In step S <b> 3, the camera-side control unit 460 turns on the output switch 420 and the input switch 430 and ends the present processing step. That is, the camera-side control unit 460 starts transmission / reception of a control signal when the control signal is not transmitted / received to / from the lens driving unit 500 incorporated in the lens device 110, and is incorporated in the lens device 110. When the control signal is transmitted / received to / from the lens driving unit 500, the control signal transmission / reception is continued.

  In step S4, the camera-side control unit 460 turns off the output switch 420 and the input switch 430, and proceeds to step S5. That is, the camera-side control unit 460 maintains a state in which the control signal is not transmitted / received when the control signal is not transmitted / received to / from the lens driving unit 500 built in the lens device 110. When the control signal is transmitted / received to / from the lens driving unit 500 built in 110, the transmission / reception is terminated.

  In step S5, the camera-side control unit 460 turns off the power supply switch 410 and ends this processing step. That is, the camera-side control unit 460 maintains a state in which no power is supplied when power is not supplied to the lens driving unit 500 built in the lens device 110, and the lens built in the lens device 110. When power is being supplied to the drive unit 500, the power supply is terminated.

  As described above, the camera-side control unit 460 detects that the lens device 110 is mounted by the mounting detection unit 450, and is built in the lens device 110 by the connection detection / specification transmission unit 440 via the connection terminal 203. Only when it is detected that the lens drive unit 500 is electrically connected, power is supplied to the lens drive unit 500 to control its operation. Thereby, in the camera-side control unit 460, even if the push switch 205 does not return and remains on while the camera body 100 and the lens device 110 are detached, the connection detection / specification transmission unit 440 is maintained. By detecting that the lens device 110 has been removed from the detection result of, the power supply switch 410, the output switch 420, and the input switch 430 can be reliably turned off.

  In addition, the camera-side control unit 460 performs the processing related to Steps S1 to S5 as described above, thereby turning on the power supply switch 410 as shown in FIG. After the power supply to the drive unit 500 is started, the output switch 420 and the input switch 430 are turned on to start communication with the lens drive unit 500 built in the lens device 110. The camera-side control unit 460 turns off the input switch 430 and the output switch 420 before turning off the power supply switch 410 and ending the power supply to the lens driving unit 500 built in the lens apparatus 110. Then, the communication with the lens driving unit 500 built in the lens device 110 is terminated. By performing such processing, the camera-side control unit 460 prevents the lens driving unit 500 built in the lens device 110 from operating unexpectedly when being attached to or detached from the lens device 110. Can do.

  The lens driving unit 500 driven by the power supplied from the camera side control unit 460 as described above includes a connection notification / specification reception unit 510, a lens side control unit 520, a focus / zoom driver 530, and a focus ring sensor 540. And a camera shake correction driver 550 and an iris driver 560.

  The connection notification / specification receiving unit 510 is connected to the connection terminal 213 in the connection terminal group 212 described above, and this camera body 100 is electrically connected to the camera body 100 via the connection terminal 213. And the specification information transmitted from the camera body 100 is received. The connection notification / specification receiving unit 510 transmits the specification information received from the camera body 100 to the lens side control unit 520.

  The lens-side control unit 520 performs the following operation when power is supplied via the connection terminal group 211.

  First, the lens-side control unit 520 is supplied with a control signal including the vertical synchronization signal VD from the camera-side control unit 460. The lens-side control unit 520 synchronizes with the vertical synchronization signal VD based on the specification information supplied from the connection notification / specification reception unit 510. Here, since the specification information indicates whether the video signal processed by the camera body 100 is NTSC or PAL, that is, the difference in the vertical synchronization signal VD, the lens-side control unit 520 determines that the vertical signal is based on the specification information. After a signal having the same frequency as that of the synchronization signal VD is generated by a frequency divider or the like, the vertical synchronization signal VD is drawn by shifting the phase.

  Then, the lens-side control unit 520 supplies a control signal synchronized with the vertical synchronization signal VD to the focus / zoom driver 530, the focus ring sensor 540, the camera shake correction driver 550, and the iris driver 560, respectively.

  Specifically, the lens-side control unit 520 sets the zoom position according to the operation of the zoom ring 112 and the zoom control lever 114 in synchronization with the synchronization signal obtained by multiplying the vertical synchronization signal VD and the multiplied synchronization signal. And a signal indicating the same are supplied to the focus / zoom driver 530. For example, when the video signal is NTSC, the lens-side control unit 520 focuses / zooms the synchronization signal of 240 [Hz] obtained by multiplying 60 [Hz] by 4 and the control signal for updating the zoom position at 240 [Hz]. This is supplied to the driver 530.

  Further, the lens-side control unit 520 detects the focus position corresponding to the operation of the focus ring 111 by the focus ring sensor 540 at a timing synchronized with the vertical synchronization signal VD. Then, the lens side control unit 520 controls the focus position by driving the focus / zoom driver 530 according to the detection result by the focus ring sensor 540.

  Further, the lens-side control unit 520 supplies at least one of the current focus position, zoom position, and aperture value as a control signal to the camera shake correction driver 550. The camera shake correction driver 550 performs camera shake correction processing asynchronously with respect to the vertical synchronization signal VD, but transmits and receives control signals to and from the lens-side control unit 520 in synchronization with the vertical synchronization signal VD.

  In addition, the lens-side control unit 520 supplies a signal indicating an aperture value corresponding to the operation of the iris ring 113 described above to the iris driver 560 in synchronization with the vertical synchronization signal VD.

  The focus / zoom driver 530, the focus ring sensor 540, the camera shake correction driver 550, and the iris driver 560 to which a control signal is supplied from the lens side control unit 520 operate as follows.

  The focus / zoom driver 530 is supplied with power from the connection terminal group 211, and drives each optical element so that the focus position and the zoom position are in accordance with the control signal supplied from the lens-side control unit 520.

  The focus ring sensor 540 is supplied with power from the connection terminal group 211, detects a focus position corresponding to the operation of the focus ring 111, and supplies the detection result to the lens side control unit 520 in synchronization with the vertical synchronization signal VD. To do.

  The camera shake correction driver 550 is supplied with power from the connection terminal group 211 and drives each optical element to perform a predetermined camera shake correction process in accordance with a control signal supplied from the lens-side control unit 520.

  The iris driver 560 is supplied with power from the connection terminal group 211, and sets the aperture mechanism of each optical element, specifically the lens device 110, so that the aperture value corresponds to the control signal supplied from the lens-side control unit 520. Drive.

  Next, a connection detection / specification transmission unit 440 that detects electrical connection between the camera body 100 and the lens device 110 and communicates specification information with a pair of connection terminals 203 and 213, and a connection notification / specification. The receiving unit 510 is realized by a circuit configuration as shown in FIG.

  The connection detection / specification transmission unit 440 detects that the transmission terminal 301 that transmits the specification information from the camera-side control unit 460 and the lens driving unit 500 built in the lens device 110 are electrically connected. It comprises a detection terminal 302, three transistors Q1 to Q3, and a total of seven resistance elements R1, R2, R3, R5, R6, R7, and R8.

  If the transmission terminal 301 is specification information indicating that the video signal is NTSC, the voltage level is set to HIGH by the camera-side control unit 460, and if the specification information indicates that the video signal is PAL, the camera-side control is performed. The voltage level is set to LOW by the unit 460.

  When the voltage level is HIGH, the detection terminal 302 supplies a detection result that it is electrically connected to the lens driving unit 500 to the camera-side control unit 460. Further, when the voltage level of the detection terminal 302 is LOW, it is assumed that the lens drive unit 500 is not electrically connected.

  The transistor Q1 is a pnp-type transistor, the collector side is connected to the power supply positive electrode end, the base side is connected to the transmission terminal 301 via the contact 306, and the emitter side is connected to the resistance element R5.

  The transistor Q2 is a pnp type transistor, and has a collector side connected to the power supply positive electrode end, a base side connected to the resistor element R6, and an emitter side connected to the resistor element R7.

  The transistor Q3 is a pnp type transistor, and has a collector side connected to the contact 307, a base side connected to the contact 308, and an emitter side connected to the ground terminal.

  The resistance element R <b> 1 is a resistance element having a resistance value of 100 [kΩ], and is connected between the power supply positive electrode end and the contact 306.

  The resistance element R <b> 2 is a resistance element having a resistance value of 10 [kΩ], and is connected between the power supply positive electrode end and the contact 307. The resistance element R2 is connected to the collector of the transistor Q3 and the detection terminal 302 via a contact 307.

  The resistance element R3 is, for example, a resistance element having a resistance value of 47 [kΩ], and is connected between the power supply positive electrode end and the contact 304. The resistance element R3 is connected to the resistance element R5, the resistance element R6, and the connection terminal 203 via the contact 304, respectively.

  The resistance element R5 is a resistance element having a resistance value of 10 [kΩ], and is connected between the emitter side of the transistor Q1 and the contact 304.

  The resistance element R6 is a resistance element having a resistance value of 1 [kΩ], and is connected between the contact 304 and the base of the transistor Q2.

  The resistance element R7 is a resistance element having a resistance value of 4.7 [kΩ], and is connected between the emitter of the transistor Q2 and the contact 308. The resistance element R7 is connected to the resistance element R8 via the contact point 308.

  The resistance element R8 is a resistance element having a resistance value of 4.7 [kΩ], and is connected between the contact point 308 and the ground terminal.

  The connection notification / specification receiving unit 510 includes a receiving terminal 303 for receiving specification information transmitted from the camera-side control unit 460, a transistor Q4, and a total of two resistance elements R4 and R10. .

  The reception terminal 303 is received as specification information indicating that the video signal is NTSC when the voltage level is LOW, and is received as specification information indicating that the video signal is PAL when the voltage level is HIGH.

  The transistor Q4 is a pnp type transistor, the collector side is connected to the receiving terminal 303 via the contact 310, the base side is connected to the connection terminal 203 via the contact 309, and the emitter side is connected to the ground terminal. Yes.

  The resistance element R4 is a resistance element having a resistance value of 10 [kΩ], and is connected between the positive electrode terminal of the power source and the contact 310.

  The resistance element R10 is a resistance element having a resistance value of 4.7 [kΩ], and is connected between the contact 309 and the ground terminal.

  In the circuit described above, the value of the voltage Vcc at the positive terminal of the power supply is 2.8 V, the DC current amplification factor hfe of the transistors Q1 to Q4 is sufficiently high, and the base current is negligible. The base-emitter voltages when the transistors Q1 to Q4 are in the ON state are Vf1 to Vf4. Moreover, since Vf1-Vf4 is generally about 0.5-0.7V at 25 degreeC, it is set to 0.7V for convenience.

  The connection detection / specification transmission unit 440 and the connection notification / specification reception unit 510 having the circuit configuration described above operate as follows.

  First, when the camera body 100 and the lens device 110 are disconnected and the connection terminals 203 and 213 are open, the connection detection / specification transmission unit 440 has a contact 304 regardless of whether the voltage level of the transmission terminal 301 is LOW / HIGH. Is substantially the same as Vcc. Therefore, in the connection detection / specification transmission unit 440, the voltage Vb3 applied to the base of the transistor Q3 is 1.05 [V] from the following equation (1) according to the resistance values of the resistance elements R7 and R8. ing.

  Vb3 = (Vcc−Vf2) × R8 / (R7 + R8) (1)

  That is, the transistor Q3 is turned on, and the voltage level of the detection terminal 302 is LOW. When the transistor Q3 is turned on, the voltage Vb3 is clamped to the voltage Vf3.

  Next, in the state where the camera body 100 and the lens device 110 are attached and the connection terminal 203 and the connection terminal 213 are in contact and electrically connected, the connection notification / specification reception unit 510 sets the transmission terminal 301. When the voltage level becomes HIGH, the transistor Q4 is turned on. As a result, the base voltage Vb4 applied to the transistor Q4 is clamped to the voltage Vf4. Therefore, in the connection notification / specification receiving unit 510, since the potential of the contact 305 is (Vf4-Vf2) [V], the transistor Q3 is turned OFF and the detection terminal 302 is HIGH.

  Here, when the transmission terminal 301 is LOW, the potential V304 of the contact 304 is about 0.25 [V] from the following equation (2).

  V304 = Vcc × R10 / (R3 + R10) (2)

  The voltage applied to the base of the transistor Q3 is lower than when the transmission terminal 301 is HIGH, the transistor Q3 is turned OFF, and the detection terminal 302 is HIGH. In this way, when the camera body 100 and the lens device 110 are attached, the voltage level of the detection terminal 302 is HIGH regardless of whether the voltage level of the transmission terminal 301 is HIGH / LOW. That is, the connection terminals 203 and 213 function as terminals for detecting that the camera body 100 and the lens device 110 are mounted on the camera body 100 side.

  Note that the connection notification / specification receiving unit 510 may be a circuit configuration that notifies that the connection terminals 203 and 213 are electrically connected to the camera body 100 side by contact, and is a passive element. The present invention is not limited to a configuration in which it is detected that a current flows through a certain resistance element R10 and is electrically connected to the camera body 100 side.

  When the voltage level of the transmission terminal 301 is LOW with the camera body 100 and the lens device 110 attached, the voltage Vb4 applied to the base of the transistor Q4 is about 0. 25 [V].

  Vb4 = Vcc × R10 / (R3 + R10) (3)

  At this time, the transistor Q4 is turned OFF, and as a result, the voltage level of the receiving terminal 303 becomes HIGH.

  On the other hand, when the camera body 100 and the lens device 110 are attached and the transmission terminal 301 is HIGH, the voltage Vb4 is about 0.81 [V] from the following equation (4).

  Vb4 = Vcc × (R10 // R5) / {R3 + (R10 // R5)} + (Vcc−Vf1) × (R10 // R3) / {R5 + (R10 // R3)} (4)

  In Equation (4), (R10 // R5) represents the parallel combined resistance value of R10 and R5, and (R10 // R3) represents the parallel combined resistance value of R10 and R3.

  At this time, the transistor Q4 is turned on. As a result, the voltage level of the receiving terminal 303 becomes LOW. When the transistor Q4 is turned on, the voltage Vb4 is clamped to the voltage Vf4.

  In this way, the connection terminals 203 and 213 function as terminals for communicating NTSC (60i for HD) / PAL (50i for HD) as specification information from the camera body 100 to the lens apparatus 110.

  As described above, the connection detection / specification transmission unit 440 detects the connection terminal 203 for detecting that the lens driving unit 500 built in the lens device 110 is connected to the one connection terminal 203, and The lens driving unit 500 can also be used as a terminal for transmitting information related to the specification of the imaging process of the camera body 100.

  In addition, the connection notification / specification receiving unit 510 receives information regarding the connection terminal for notifying that one connection terminal 213 is connected to the camera body 100 side and the specification of the imaging processing from the camera body 100. It can also be used as a receiving terminal.

  In the camera body 100, the camera-side control unit 460 supplies power to the lens driving unit 500 built in the lens device 110 based on the detection result using the connection terminal 203. When the device 110 is removed, the power supply can be cut off instantaneously.

  Further, as described above, since the camera body 100 and the lens device 110 require a large number of terminals for electrical connection to the respective joint surfaces 200 and 210, the two functions are combined as described above. By sharing the connection terminals 203 and 213, an increase in the number of terminals can be suppressed, and the space of the joint surface can be saved and the cost can be reduced.

  In addition, this invention is not limited only to the above embodiment, Of course, a various change is possible in the range which does not deviate from the summary of this invention.

FIG. 1A is a front view of the camera system, and FIG. 1B is a rear view of the camera system. 2A is a left side view of the camera system, FIG. 2B is a right side view of the camera system, and FIG. 2C is a plan view of the camera system. It is the figure which showed the joint surface where a camera body and a lens join. It is the block diagram which showed the structure of each process part with which a camera body and a lens are provided. It is a flowchart provided in order to demonstrate the process which a camera side control part performs. It is a time chart provided in order to demonstrate the process which a camera side control part performs. It is the figure which showed the circuit structure of the connection detection / specification transmission part and the connection notification / specification reception part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Camera system, 100 Camera body, 101 Cable connection part, 102 Recording media storage part, 103 External media connection part, 104 Operation input part, 105 Microphone, 106 Display finder, 107 Display panel, 108 Display part, 109 Mount part, 110 Lens device, 111 Focus ring, 112 Zoom ring, 113 Iris ring, 114 Zoom control lever, 120 Battery, 200, 210 Joint surface, 201, 202, 211, 212 Connection terminal group, 203, 213 Connection terminal, 204, 214 Hollow Part, 205, 215 pressure switch, 301 transmission terminal, 302 detection terminal, 303 reception terminal, 304-310 contact, 410 power supply switch, 420 output switch, 430 input Switch, 440 Connection detection / specification transmission unit, 450 Mounting detection unit, 460 Camera side control unit, 500 Lens drive unit, 510 Connection notification / specification reception unit, 520 Lens side control unit, 530 Zoom driver, 540 Focus ring sensor, 550 Camera shake correction driver, 560 iris driver

Claims (7)

In the imaging device in which the lens device incorporating the driving means for driving the optical element according to the specification of the imaging processing is removable,
A connection terminal electrically connected to the driving means built in the lens device;
A connection detection means for detecting that the drive means built in the lens device is electrically connected via the connection terminal;
Control means for supplying power to the drive means built in the lens device based on the detection result by the connection detection means;
An imaging apparatus comprising: specification transmission means for transmitting information related to the specification to a drive means built in the lens device via a connection terminal used for the connection detection means. It further comprises a mounting detection means for detecting that the lens device is mounted,
The control means detects that the lens apparatus is attached by the attachment detection means, and is electrically connected to the drive means incorporated in the lens apparatus via the connection terminal by the connection detection means. 2. The imaging apparatus according to claim 1, wherein power is supplied to the lens apparatus only when it is detected. The control means controls the operation of the lens apparatus by communicating between a power supply means for supplying power to the driving means built in the lens apparatus and a driving means built in the lens apparatus. Communication control means,
The communication control means starts communication with the drive means after the power supply means starts supplying power to the drive means built in the lens apparatus, and the power supply means sends the power to the drive means. The imaging apparatus according to claim 1, wherein communication with the driving unit is terminated before power supply is terminated. In the control method of the detachable imaging device, the lens device incorporating the driving means for driving the optical element according to the specification of the imaging processing is detachable.
A connection detecting step for detecting that the driving means built in the lens device is electrically connected via the connection terminal;
Based on the detection result of the connection detection step, a power supply step of supplying power to the driving means built in the lens device;
A method for controlling an imaging apparatus, comprising: a specification transmission step for transmitting information relating to the specification to a driving means built in the lens device via a connection terminal used in the connection detection step. In a lens device detachable from the imaging device,
A connection terminal electrically connected to the imaging device;
Connection notifying means for notifying the imaging apparatus that the imaging apparatus is electrically connected via the connection terminal;
Driving means for driving the optical element by the power supplied from the imaging apparatus that has notified that the connection notification means is electrically connected;
Specification receiving means for receiving information related to the specification of the imaging device transmitted via the connection terminal used for the connection notification means,
The lens device according to claim 1, wherein the driving unit drives the optical element in accordance with information related to the specification received by the specification receiving unit. In the control method of the imaging device and the detachable lens device,
A connection notification step of notifying the imaging device that it is electrically connected to the imaging device via a connection terminal;
A drive step of driving the optical element by a power source supplied from the imaging device that has notified that the connection notification step is electrically connected;
A specification receiving step for receiving information related to the specification of the imaging device transmitted via the connection terminal used in the connection notification step;
In the driving step, the optical element is driven in accordance with information related to the specification received in the specification receiving step. In an imaging system comprising an imaging device and a lens that is detachable from the imaging device,
The lens device includes a connection terminal electrically connected to the imaging device, connection notification means for notifying the imaging device that the connection is electrically connected to the imaging device via the connection terminal, and the connection A driving unit that drives the optical element by a power source supplied from the imaging device that has notified that the notification unit is electrically connected, and a transmission terminal that is used for the connection notification unit. Having specification receiving means for receiving information on specifications;
The driving means drives the optical element in accordance with information on the specification received by the specification receiving means,
The imaging device includes a connection terminal electrically connected to the driving unit of the lens device, a connection detection unit that detects that the lens device is electrically connected via the connection terminal, Control means for supplying power to the driving means of the lens device based on the detection result by the connection detecting means, and information on the specifications via the connection terminal used for the connection detecting means. An imaging system comprising: specification transmitting means for transmitting to

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