JP2013068647A - Adapter, camera system, and adapter control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter that enables various kinds of optical systems to appropriately function in an interchangeable-lens camera system.SOLUTION: An adapter comprises an adapter control unit capable of communicating with a camera body and capable of communicating with an interchangeable lens provided with a focus adjustment mechanism including a focus lens that performs focus adjustment. The adapter control unit receives a first control order generated in the camera body according to the detection result of a focus detection unit from the camera body, converts the first control order into a second control order, and transmits the second control order to the interchangeable lens. First position information of the focus lens according to movement information of the focus lens supplied from the interchangeable lens is not transmitted to the camera body.

Description

  The present invention relates to an adapter, a camera system, and an adapter control program.

There is an interchangeable lens type camera system that includes a camera body and an interchangeable lens that can be attached to and detached from the camera body (see, for example, Patent Document 1).
In this interchangeable lens camera system, it is possible to capture images through various types of optical systems by changing the interchangeable lens mounted on the camera body.

JP 2008-275890 A

In recent years, in a digital camera system, a new lens interchangeable camera system has been developed in which the size of the camera body is smaller than before.
However, the camera body of this new interchangeable lens camera system may not be able to function by attaching the interchangeable lens of the existing camera system.
By the way, existing interchangeable lenses are generally widely used. Therefore, in a new interchangeable lens type camera system, in order to enable imaging through various types of optical systems, it is desirable that an existing interchangeable lens can be mounted and functioned. ing.

  The present invention has been made in view of such circumstances, and an object thereof is an adapter, a camera system, and an adapter capable of appropriately functioning various types of optical systems in an interchangeable lens camera system. It is to provide a control program.

  The present invention has been made in order to solve the above-described problems. The present invention provides a first mount portion to which a camera body including a focus detection portion for performing focus detection can be attached and detached, and the first mount portion. The adapter that is provided and is capable of detaching an interchangeable lens having a focus adjustment mechanism including a focus lens that performs focus adjustment; and the adapter that is communicable with the camera body and is communicable with the interchangeable lens. A controller, and the adapter controller receives the first control command generated by the camera body according to the detection result of the focus detector from the camera body, and the first control The command is converted into the second control command, the second control command is transmitted to the interchangeable lens, and the second control command is supplied from the interchangeable lens. First position information of the focus lens corresponding to the movement information of Okasurenzu is an adapter, characterized in that not transmitted to the camera body.

  According to another aspect of the present invention, there is provided a camera system comprising: the adapter described above; the camera body attached to the first mount portion; and the interchangeable lens attached to the second mount portion. is there.

  In addition, the present invention provides a first mount portion to which a camera body including a focus detection portion for performing focus detection can be attached and detached, and a focus including a focus lens for performing focus adjustment, which is provided separately from the first mount portion. An adapter control program for controlling an operation of an adapter control unit provided in an adapter including a second mount unit on which an interchangeable lens having an adjustment mechanism can be attached and detached, according to a detection result of the focus detection unit Receiving the first control command generated by the camera body from the camera body; converting the first control command into the second control command; and the second control command. Transmitting to the interchangeable lens, and the focus according to movement information of the focus lens supplied from the interchangeable lens First position information of the lens is an adapter control program characterized by not being transmitted to the camera body.

  According to the present invention, various types of optical systems can appropriately function in an interchangeable lens camera system.

It is a perspective view which shows the structure of the camera system by one Embodiment of this invention. It is a perspective view which shows an example of a structure of the adapter by this embodiment. It is a schematic block diagram which shows the 1st example of a structure of the camera system by this embodiment. It is a block diagram which shows the function structure of the camera system by this embodiment. It is a block diagram which shows the structure of the control system of AF control by this embodiment. It is a flowchart which shows the outline | summary of the state transition of the process which concerns on the interchangeable lens by this embodiment. It is a figure which shows an example of the communication sequence of command data communication in a lens regular process. It is a flowchart which shows the conversion process of the controlled variable with respect to the interchangeable lens in AF control.

Embodiments of the present invention will be described below with reference to the drawings.
<Description of camera system configuration>
FIG. 1 is a perspective view showing a configuration of a camera system 1 according to an embodiment of the present invention.
A camera system 1 shown in FIG. 1 is an interchangeable lens camera system, and is provided between a camera body 100, an interchangeable lens 200, and the camera body 100 and the interchangeable lens 200. The adapter 300 is detachably fixed to each other.
In this figure, the adapter 300 is attached to the camera body 100. The interchangeable lens 200 is attached to the camera body 100 via the adapter 300.

In this camera system 1, the specification of the camera body side mount 101 which is a lens mount provided in the camera body 100 and the specification of the lens side mount 201 which is a lens mount provided in the interchangeable lens 200 are different from each other. is there. For example, the specifications of the camera body side mount 101 and the specifications of the lens side mount 201 are different from each other in the specifications of the mount shape and the specifications of the connection terminals to be electrically connected. Further, the communication standard and the type of communication data communicated via the connection terminal are different from each other. Therefore, the interchangeable lens 200 cannot be directly attached to the camera body 100.
Therefore, the adapter 300 is configured as a mount adapter that allows the camera body 100 and the interchangeable lens 200 to be mounted indirectly. Furthermore, the adapter 300 is configured to enable communication between the camera body 100 and the interchangeable lens 200 having different communication standards and types of communication data without changing the communication standards and the like. Has been.
In addition, the camera body 100 includes a power button 131, a release button 132, a rear operation unit 133, and a display unit 150.
The power button 131 is an operation member for switching the main power source on and off in the camera body 100.
The release button 132 is an operation member that receives an instruction to start shooting processing. For example, the release button 132 is pressed halfway (half-pressed state, for example, accepting focus adjustment, exposure adjustment, etc.) and fully pressed (full-pressed state, for example, accepting an instruction to start exposure). Two types of shooting processing start instructions are accepted.
The back operation unit 133 is provided on the back surface of the housing surface of the camera body 100, which is the surface opposite to the surface provided with the camera body side mount 101. The rear operation unit 133 includes operation members such as operation mode selection buttons (for example, a mode dial) or various setting condition selection buttons (for example, a menu button and up / down / left / right selection buttons). .
The display unit 150 is provided on the back side similarly to the back side operation unit 133, and displays a captured image or a menu screen for selecting various setting conditions. The display unit 150 includes, for example, a liquid crystal display or an organic EL (Electro-Luminescence) display.

FIG. 2 is a perspective view showing an example of the configuration of the adapter 300 according to the present embodiment.
The adapter 300 includes a first mount part to which the camera body 100 can be attached and detached, and a second mount part that is provided separately from the first mount part and from which the interchangeable lens 200 can be attached and detached.
For example, as illustrated in FIG. 2, the adapter 300 includes a first mount 301 (first mount portion) that can be attached to and detached from the camera body side mount 101 included in the camera body 100, and a lens side mount included in the interchangeable lens 200. 201, a second mount 302 (second mount portion) that can be attached to and detached from the device 201.
A plurality of electrical connection terminals (mount contacts) corresponding to each of the plurality of electrical connection terminals provided in the vicinity of the camera body side mount 101 are provided in the vicinity of the first mount 301. Enter. Thereby, when the adapter 300 is attached to the camera body 100, the adapter 300 is electrically connected to the camera body 100 via the plurality of connection terminals.
A plurality of electrical connection terminals corresponding to each of the plurality of electrical connection terminals provided in the vicinity of the lens side mount 201 are provided in the vicinity of the second mount 302. Thus, when the adapter 300 is attached to the interchangeable lens 200, the adapter 300 is electrically connected to the interchangeable lens 200 via the plurality of connection terminals.

The adapter 300 includes a tripod seat 305 that enables the adapter 300 to be attached to a tripod, a lens attaching / detaching button 306, and an aperture interlocking lever 350.
The lens attaching / detaching button 306 is a button for unlocking a lock mechanism that is mechanically locked when the interchangeable lens 200 is attached. That is, the lens attaching / detaching button 306 is an operation member that is operated when the user removes the interchangeable lens 200 attached to the adapter 300.

The aperture interlocking lever 350 (aperture interlocking mechanism unit) includes an aperture mechanism 251 (FIG. 5) including a plurality of aperture blades that change the aperture diameter (aperture aperture amount, aperture size, aperture ratio, aperture value) of the interchangeable lens 200. 3), the adapter 300 is provided as a lever for displacing. When the position of the diaphragm interlocking lever 350 moves in the direction along the inner periphery of the adapter 300, the aperture diameter of the diaphragm of the interchangeable lens 200 is changed.
That is, the aperture interlocking lever 350 moves to a position corresponding to the aperture value of the aperture mechanism 251 (aperture) provided in the interchangeable lens 200.

<Description of block configuration of camera system>
Next, the block configuration of the camera system 1 will be described with reference to FIG.
FIG. 3 is a schematic block diagram illustrating an example of the configuration of the camera system 1 according to the present embodiment. In this figure, the camera body 100 and the interchangeable lens 200 are attached via an adapter 300. In addition, the camera body 100, the interchangeable lens 200, and the adapter 300 are electrically connected to each other via connection terminals.

First, an outline of the configuration of the camera system 1 will be described.
The camera body 100 includes a camera body side mount 101 including a connection portion 101s. The adapter 300 includes a first mount 301 including a connection portion 301s and a second mount 302 including a connection portion 302s. The interchangeable lens 200 includes a lens side mount 201 including a connection portion 201s.

The camera body 100 and the adapter 300 are mounted (physically connected) via the camera body side mount 101 and the first mount 301, and are electrically connected via the connection portion 101s and the connection portion 301s. Yes. Each of the connection portion 101s and the connection portion 301s includes twelve connection terminals (terminals Ta1 to Ta12 and terminals Tb1 to Tb12) that are electrically connected to each other, and the camera body 100 and the adapter are connected via the connection terminals. Power supply (voltage supply) and signal exchange (communication) are performed with 300.
In addition, transmission / reception (communication) of a signal is performed between the camera control part 110 with which the camera body 100 is provided, and the adapter control part 310 with which the adapter 300 is provided.

Further, the interchangeable lens 200 and the adapter 300 are mounted (physically connected) via the lens side mount 201 and the second mount 302, and are electrically connected via the connection portion 201s and the connection portion 302s. ing. Each of the connection portion 201s and the connection portion 302s includes nine connection terminals (terminals Tc1 to Tc9 and terminals Td1 to Td9) that are electrically connected to each other. Power supply (voltage supply) and signal exchange (communication) are performed with the adapter 300.
Note that transmission / reception (communication) of signals is performed between the lens control unit 210 provided in the interchangeable lens 200 and the adapter control unit 310 provided in the adapter 300.

(Configuration of camera body)
Next, the configuration of the camera body 100 will be described.
The camera body 100 includes a camera control unit 110, a camera power supply unit 120, a switch 125, a battery unit 190B, and connection units 101s (terminals Ta1 to Ta12).
101 s of connection parts are provided with 12 connection terminals of terminal Ta1-Ta12 as a connection terminal mutually connected with 12 connection terminals (terminal Tb1-Tb12) of the connection part 301s with which the adapter 300 is provided.
The configuration of the adapter 300 will be described later in detail.

The battery unit 190B houses the battery 190.
The battery 190 supplies voltage to the camera body 100, the interchangeable lens 200, and the adapter 300. For example, the battery 190 is a lithium ion secondary battery or a nickel hydride secondary battery. The battery 190 may be a primary battery such as an alkaline battery. Further, the camera body 100 is not limited to the configuration in which the voltage is supplied from the battery 190, and the voltage is supplied from an external DC power source (for example, an AC adapter that converts the AC power source into a DC power source and supplies the voltage). Also good.

  The camera power supply unit 120 converts the battery voltage so that the voltage supplied from the battery 190 can be supplied to the camera body 100 or a camera accessory connected to the camera body 100. For example, the camera power supply unit 120 converts the battery voltage to supply a voltage to a control system circuit (mainly the camera control unit 110) included in the camera body 100, and the camera power supply unit 120 is connected to the power supply Vcc0. The power supply Vcc1 that is a first power supply system that supplies a voltage to the adapter 300 connected to the unit 101s is divided. The voltage of the power supply Vcc1 is supplied to a control system circuit (mainly the adapter control unit 310) provided in the adapter 300. Hereinafter, this power supply Vcc1 is referred to as a control system power supply Vcc1.

Further, the camera power supply unit 120 switches between a voltage supply state and a supply stop state by the control system power supply Vcc1 under the control of the camera control unit 110. Furthermore, the camera power supply unit 120 controls the power that can be supplied (power amount, power supply amount) under the control of the camera control unit 110. For example, the camera power supply unit 120 is in a state (normal power supply state) in which the power (power amount, power supply amount) that can be supplied to the extent that the camera system 1 can execute the imaging process is large, and to the extent that the imaging process cannot be performed. The state (small power supply state) with a small amount of power (power amount, power supply amount) that can be supplied is switched.
The voltage of the control system power supply Vcc1 is supplied to the adapter control unit 310 via the terminal Ta3 and the terminal Tb3.

  Further, the positive terminal of the battery 190 and the terminal Ta2 are connected to the battery part 190B via the switch 125. As a result, the power supply PWR as the second power supply system is generated from the battery 190 separately from the power supply Vcc1 as the first power supply system described above, and the voltage from the power supply PWR is supplied to the adapter power supply unit 320. The voltage of the power supply PWR is supplied to the adapter power supply unit 320 via the terminal Ta2 and the terminal Tb2. Instead of the battery 190, the voltage of the power source PWR may be supplied from an external DC power source. The power supply PWR is a power supply system that can supply more power than the control system power supply Vcc1. Hereinafter, this power supply PWR is referred to as a power system power supply PWR.

The power system ground PGND, which is a ground (GND) corresponding to the power system power supply PWR, is connected to each part to which the voltage of the power system power supply PWR is supplied and the terminal Ta1. On the other hand, a control system ground SGND that is a ground corresponding to the control system power supply Vcc1 is connected to the terminal Ta12. The power system ground PGND and the control system ground SGND are grounds having the same potential as the negative terminal of the battery 190 via the battery unit 190B.
The control system ground SGND is also a ground corresponding to the power supply Vcc0, and the control system ground SGND is connected to the ground terminal of the camera control unit 110.

  The switch 125 switches between a conduction state and a cutoff state (non-conduction state) under the control of the camera control unit 110. That is, the switch 125 switches whether to supply the voltage of the power system power supply PWR to the terminal Ta2 under the control of the camera control unit 110.

  The camera control unit 110 includes a camera power control unit 111, a first camera communication unit 112, and a second camera communication unit 113. The camera control unit 110 controls each unit included in the camera body 100, and the first data communication system D1b and the second data communication with the adapter control unit 310 of the adapter 300 connected via the connection unit 101s. Two systems of communication with the system D2b are performed.

The camera power supply control unit 111 controls the camera power supply unit 120 and the switch 125 based on the state of the camera body 100 or the communication state by the first camera communication unit 112 or the second camera communication unit 113.
Each of the first camera communication unit 112 and the second camera communication unit 113 independently performs two systems of communication of the first data communication system D1b and the second data communication system D2b.

The first data communication system D1b is a communication system using serial interface full-duplex communication. The first camera communication unit 112 performs transmission / reception (communication) of four types of signals RDY, CLK1, DATAB, and DATAL as the first data communication system D1b.
The signal RDY is a signal for notifying the first camera communication unit 112 of whether communication is possible. The signal RDY is transmitted (output) from the first adapter communication unit 312 described later to the first camera communication unit 112 via the terminal Ta4. The signal CLK1 is a clock signal for serial communication. The clock signal CLK1 is transmitted (output) from the first camera communication unit 112 to the first adapter communication unit 312 via the terminal Ta5. The signal DATAB is a data signal related to the camera body 100 that is output from the first camera communication unit 112 to the first adapter communication unit 312 via the terminal Ta6. The signal DATAL is a data signal related to the interchangeable lens 200 that is output from the first adapter communication unit 312 to the first camera communication unit 112. The first camera communication unit 112 receives the signal DATAL via the terminal Ta7.

The second data communication system D2b is a serial interface system, and is a communication system using unidirectional communication in which data is transmitted to the camera body 100. The second camera communication unit 113 performs transmission / reception (communication) of four types of signals HREQ, HANS, HCLK, and HDATA.
The signal HREQ is a signal indicating a communication request from the second camera communication unit 113, and the second camera communication unit 113 transmits (outputs) to the second adapter communication unit 313 described later via the terminal Tb8. . The signal HANS is a signal indicating a communication response to the second camera communication unit 113, and is transmitted from the second adapter communication unit 313 to the second camera communication unit 113 via the terminal Tb9. The signal HCLK is a clock signal for serial communication. The clock signal HCLK is transmitted (output) from the second camera communication unit 113 to the second adapter communication unit 313 via the terminal Tb10. The signal HDATA is a lens data signal transmitted from the second adapter communication unit 313 to the second camera communication unit 113 via the terminal Tb11.

  The contents of communication in the first data communication system D1b and the second data communication system D2b will be described in detail later.

(Configuration of interchangeable lens)
Next, the configuration of the interchangeable lens 200 will be described.
The interchangeable lens 200 includes a connection unit 201s (terminals Td1 to Td9), a lens control unit 210, an optical system 220, and an optical system driving unit 230.
Subject light (optical image) incident through the optical system 220 is guided to a light receiving surface of a well-known imaging element (not shown) provided in the camera body 100 through an adapter 300.
The optical system 220 includes a lens 221, a focus adjustment lens (hereinafter referred to as a focus lens) 222, and an image blur correction (anti-vibration) lens (hereinafter referred to as a VR (Vibration Reduction) lens) 223. And a diaphragm unit 250.

  The aperture unit 250 includes an aperture mechanism 251 including a plurality of aperture blades, and an aperture lever 252 that mechanically operates the aperture mechanism 251. Therefore, the aperture diameter of the interchangeable lens 200 changes when the aperture lever 252 mechanically operates the aperture mechanism 251. The interchangeable lens 200 in the camera system 1 shown in FIG. 3 is a lens that does not incorporate a power source such as an actuator that drives the diaphragm mechanism 251, and the diaphragm mechanism 252 of the adapter 300 is coupled to the diaphragm mechanism 252 via the diaphragm lever 252. Reference numeral 251 denotes a lens to be driven.

The optical system driving unit 230 includes an AF (Auto Focus) driving unit 231, an AF encoder 232, and a VR driving unit 235.
The AF driving unit 231 drives the focus lens 222 under the control of the lens control unit 210. The AF encoder 232 detects the position of the focus lens 222 and supplies the detection result to the lens control unit 210.
The VR drive unit 235 drives the VR lens 223 under the control of the lens control unit 210.
Note that the interchangeable lens 200 may include a focus ring that moves the position of the focus lens 222 when manually operated by the user.

The connection unit 201s includes nine connection terminals Td1 to Td9 as connection terminals connected to the nine connection terminals (terminals Tc1 to Tc9) of the connection unit 302s included in the adapter 300.
The power source Vp to which the voltage of the optical system driving unit 230 is supplied is supplied via the terminal Td2. Hereinafter, this power source Vp is referred to as a lens driving system power source Vp. The lens driving system power supply Vp is supplied from the power system power supply PWR via the adapter 300.
For example, the lens driving system power supply Vp is supplied from the terminal Td2 to the optical system driving unit 230 that consumes a large amount of power, such as an actuator that drives the focus lens 222 provided in the AF driving unit 231 and an actuator that drives the VR lens 223. Is supplied. A power system ground PGND that is a ground corresponding to the lens driving system power supply Vp is connected to the ground terminal of the optical system driving unit 230 and the terminal Td1.

A power supply Vc to which the voltage of the lens control unit 210 is supplied is connected to the terminal Td3. Hereinafter, this power source Vc is referred to as a lens control system power source Vc. The lens control system power supply Vc is supplied from the power system power supply PWR via the adapter 300.
The voltage of the lens control system power supply Vc is supplied to the control system circuit including the lens control unit 210 that consumes less power than the optical system driving unit 230 via the terminal Td3. A control system ground SGND that is a ground corresponding to the lens control system power supply Vc is connected to the ground terminal of the lens control unit 210 and the terminal Td9.
That is, the power system ground PGND and the control system ground SGND are not connected to each other in the interchangeable lens 200 and are separated into two systems of ground.

  The lens control unit 210 includes an optical system control unit 211, a first lens communication unit 212, and a second lens communication unit 213. The lens control unit 210 controls the optical system driving unit 230, and the first data communication system D1L and the second data communication system D2L with the adapter control unit 310 of the adapter 300 connected via the connection unit 201s. The two systems of communication are controlled.

  The optical system control unit 211 controls the optical system drive unit 230. For example, the optical system control unit 211 initializes the optical system drive unit 230 according to the communication state with the adapter 300. Further, the optical system control unit 211 controls the optical system drive unit 230 so as to drive a drive element such as the focus lens 222 or the VR lens 223 according to the control of the camera control unit 110 via the adapter 300. Further, the optical system control unit 211 acquires information on the optical system (driving element) 220 supplied from the optical system driving unit 230 (for example, information such as the position of the focus lens 222 detected by the AF encoder 232).

The first lens communication unit 212 and the second lens communication unit 213 respectively execute two systems of communication of the first data communication system D1L and the second data communication system D2L at independent timings.
The first data communication system D1L is a communication system using serial interface half duplex communication. The first lens communication unit 212 performs communication of the three types of signals R / W, CLK2, and DATA as the first data communication system D1L.
The signal R / W is a read / write signal indicating a communication direction of a data signal to be described later, but is used as a signal for handshaking between the lens side and the adapter, and is described below with a first adapter communication to be described later via a terminal Td4. Data is transmitted and received between the unit 312 and the first lens communication unit 212. The signal CLK2 is a clock signal for serial communication, and is transmitted (output) from the first adapter communication unit 312 to the first lens communication unit 212 via the terminal Td5. The signal DATA is a data signal transmitted and received between the first adapter communication unit 312 and the first lens communication unit 212 via the terminal Td6.

The second data communication system D2L is a pulse communication system, and is a communication system based on unidirectional communication in which a pulse signal is output from the interchangeable lens 200. The second lens communication unit 213 transmits two types of pulse signals, signals HLP1 and HLP2, as the second data communication system D2L.
The signal HLP1 is a pulse signal transmitted to the second adapter communication unit 313, which will be described later, via the terminal Td7. The signal HLP2 is a pulse signal output from the second lens communication unit 213 to the second adapter communication unit 313 via the terminal Td8. These pulse signals HLP 1 and HLP 2 are pulse signals corresponding to signals output from the AF encoder 232.

  The contents of communication communicated in the first data communication system D1L and the second data communication system D2L will be described in detail later.

(Adapter configuration)
Next, the configuration of the adapter 300 will be described.
The adapter 300 includes an adapter control unit 310, an adapter power supply unit 320, an aperture interlocking lever driving unit 330 (aperture interlocking mechanism driving unit), a connection unit 301s (terminals Tb1 to Tb12), and a connection unit 302s (terminals Tc1 to Tc9). ) And a diaphragm interlocking lever 350.

  The connection portion 301s includes twelve connection terminals Tb1 to Tb12 that are connected to the twelve connection terminals Ta1 to Ta12 described above on the camera body 100 side. When the adapter 300 and the camera body 100 are connected via the connection part 301s and the connection part 101s, the terminals Tb1 to Tb12 of the connection part 301s correspond to the terminals Ta1 to Ta12 of the connection part 101s, respectively. Electrically connect to the connection terminal.

  The connection portion 302s includes nine connection terminals Tc1 to Tc9 that are connected to the nine connection terminals (terminals Td1 to Td9) described above on the interchangeable lens 200 side. When the adapter 300 and the interchangeable lens 200 are connected via the connection portion 302s and the connection portion 201s, the terminals Tc1 to Tc9 of the connection portion 302s correspond to the terminals Td1 to Td9 of the connection portion 201s, respectively. Connect to the connection terminal.

Terminal Tb2 is connected to terminal Ta2, and terminal Tb3 is connected to terminal Ta3. As a result, the voltage of the power system power supply PWR is supplied from the camera body 100 to the terminal Tb2 through the terminal Ta2, and the voltage of the control system power supply Vcc1 is supplied to the terminal Tb3 through the terminal Ta3. As a result, the adapter power supply unit 320 is supplied with the voltage of the power system power supply PWR from the camera body 100 via the terminal Ta2 and the terminal Tb2.
On the other hand, the adapter control unit 310 is supplied with the voltage of the control system power supply Vcc1 from the camera body 100 via the terminal Ta3 and the terminal Tb3.

As described above, the adapter 300 includes the voltage of the control system power supply Vcc1 from the camera body 100 (the voltage of the first power supply system) and the voltage of the power system power supply PWR that can be supplied in comparison with the control system power supply Vcc1 (first Both voltages of the two power supply systems are supplied. The lens system power supply Vp (third power supply system) and the lens control system power supply Vc (fourth) are used as the lens system power supply system that supplies the interchangeable lens 200 with the voltage of the power system power supply PWR supplied to the adapter power supply unit 320. (Converted). For example, the adapter power supply unit 320 generates supply voltages for the lens drive system power supply Vp and the lens control system power supply Vc that supply power to the interchangeable lens 200 from the power system power supply PWR supplied from the camera body 100.
The voltage supplied from the lens drive system power supply Vp is larger than the voltage supplied from the lens control system power supply Vc. Further, the power consumption in the load supplied from the lens drive system power supply Vp may be larger than the power consumption in the load supplied from the lens control system power supply Vc.

  Further, from the power system power supply PWR supplied to the adapter power supply section 320, a power supply Vm (fifth) for supplying a voltage to the aperture interlocking lever drive section 330, separately from the lens drive system power supply Vp and the lens control system power supply Vc described above. A power system is also generated (separated). Hereinafter, this power source Vm is referred to as a diaphragm driving power source Vm. Then, the adapter power supply unit 320 supplies the generated voltage of the diaphragm driving power source Vm to the diaphragm interlocking lever driving unit 330.

The connection of each power supply system converted by the adapter power supply unit 320 is as follows.
The terminal Tc2 is connected to the lens drive system power supply Vp output terminal (terminal that outputs the voltage of the lens drive system power supply Vp) of the adapter power supply unit 320. The terminal Tc3 is connected to a lens control system power supply Vc output terminal (terminal that outputs a voltage of the lens control system power supply Vc) of the adapter power supply unit 320. Thereby, the adapter power supply unit 320 supplies the voltage of the lens driving system power supply Vp to the terminal Tc2, and supplies the voltage of the lens control system power supply Vc to the terminal Tc3.
Further, the adapter power supply unit 320 supplies the voltage of the lens drive system power supply Vp to the optical system drive unit 230 of the interchangeable lens 200 via the terminal Tc2 and the terminal Td2.
Further, the adapter power supply unit 320 supplies the voltage of the lens control system power supply Vc to the lens control unit 210 of the interchangeable lens 200 via the terminal Tc3 and the terminal Td3.

  The terminal Tb1 is connected to the terminal Ta1 of the camera body 100. Thereby, the power system ground PGND is connected to the terminal Tb1 via the terminal Ta1. Further, the terminal Tb1 and the terminal Tc1 are connected as a power system ground PGND in the adapter 300. Further, the terminal Tc1 is connected to the terminal Td1 of the interchangeable lens 200. Thereby, the power system ground PGND is connected to the terminal Td1 via the terminal Tc1 as a ground corresponding to the lens driving system power supply Vp. The power system ground PGND is also connected as a ground for the adapter power supply unit 320, the diaphragm interlocking lever driving unit 330, and the like.

  The terminal Tb12 is connected to the terminal Ta12 of the camera body 100. Thereby, the control system ground SGND is connected to the terminal Tb12 via the terminal Ta12. The terminal Tb12 and the terminal Tc9 are connected as a control system ground SGND in the adapter 300. Further, the terminal Tc9 is connected to the terminal Td9 of the interchangeable lens 200. Thus, the control system ground SGND is connected to the terminal Td9 via the terminal Tc9 as a ground corresponding to the lens control system power supply Vc. The control system ground SGND is also connected as a ground for the adapter control unit 310.

  The aperture interlocking lever driving unit 330 moves the position of the aperture interlocking lever 350 under the control of the adapter control unit 310. The aperture interlocking lever driving unit 330 moves the aperture interlocking lever 350 to displace the aperture mechanism 251 of the interchangeable lens 200 via the aperture lever 252. Further, the aperture interlocking lever driving unit 330 detects the position of the aperture interlocking lever 350 and outputs the detection result to the adapter control unit 310.

The adapter control unit 310 includes an adapter power supply control unit 311, a first adapter communication unit 312, a second adapter communication unit 313, and an aperture control unit 314. The adapter control unit 310 is controlled by periodic communication with the camera control unit 110 to control processing performed in each unit included in the adapter 300 and performs periodic communication with the lens control unit 210. . For example, the adapter control unit 310 performs regular periodic communication with the camera control unit 110. The adapter control unit 310 also performs regular periodic communication with the lens control unit 210.
The adapter control unit 310 controls the aperture interlocking lever driving unit 330 and the optical system driving unit 230 of the interchangeable lens 200 based on communication from the camera control unit 110 for controlling the photographing process. Therefore, communication with the lens control unit 210 is performed.
The adapter power supply control unit 311 controls the adapter power supply unit 320 according to the communication result with the camera control unit 110 or the lens control unit 210, the state of the adapter 300, or the like.

  The aperture control unit 314 controls the aperture interlocking lever driving unit 330 according to the communication result with the camera control unit 110 or the lens control unit 210.

The first adapter communication unit 312 performs communication of the first data communication system D1b with the first camera communication unit 112, and performs communication of the first data communication system D1L with the first lens communication unit 212. To do.
Specifically, the first adapter communication unit 312 relays communication between the first data communication system D1b and the first data communication system D1L, which are different communication standards. For example, the first adapter communication unit 312 serially converts the data received from the first camera communication unit 112 according to the communication standard (first communication standard) of the first data communication system D1b, which is a serial interface type full-duplex communication. The data is converted into data of the communication standard (second communication standard) of the data communication system D1L which is half duplex communication of the interface method, and is transmitted to the first lens communication unit 212. On the other hand, the first adapter communication unit 312 receives the data received from the first lens communication unit 212 in accordance with the communication standard (second communication standard) of the data communication system D1L, which is a serial interface type half-duplex communication. Is converted to data of the communication standard (first communication standard) of the data communication system D1b, which is full-duplex communication, and transmitted to the first camera communication unit 112.
The first adapter communication unit 312 relays communication between the first data communication system D1b and the first data communication system D1L that are communicated with each other at different periods.
In addition, the first adapter communication unit 312 performs a conversion process for ensuring the consistency of the format of data transmitted and received between the first data communication system D1b and the first data communication system D1L.
The adapter control unit 310 includes, for example, a storage unit (not shown). The first adapter communication unit 312 temporarily stores data generated based on received data, converted data, and the like in the storage unit. Then, the first adapter communication unit 312 reads the generated data from the storage unit and transmits it.

The first adapter communication unit 312 and the first camera communication unit 112 perform communication of the first data communication system D1b via four types of signal lines of signals RDY, CLK1, DATAB, and DATAL. The terminal Tb4 is connected to the first adapter communication unit 312 via the signal line of the signal RDY. The terminal Tb5 is connected to the first adapter communication unit 312 via the signal line of the signal CLK1, the terminal Tb6 is connected to the signal line of the signal DATAB, and the terminal Tb7 is connected to the signal line of the signal DATAL. The terminal Tb4 is connected to the terminal Ta4 of the camera body 100, the terminal Tb5 is connected to the terminal Ta5, the terminal Tb6 is connected to the terminal Ta6, and the terminal Tb7 is connected to the terminal Ta7.
That is, the four types of signal lines RDY, CLK1, DATAB, and DATAL for performing communication of the first data communication system D1b are connected to the first adapter communication unit 312 and the first via the terminals Tb4 to Tb7 and the terminals Ta4 to Ta7. The camera communication unit 112 is connected.

On the other hand, the first adapter communication unit 312 and the first lens communication unit 212 execute communication of the first data communication system D1L via three types of signal lines of signals R / W, CLK2, and DATA. The terminal Tc4 is connected to the first adapter communication unit 312 via a signal R / W signal line. The terminal Tc5 is connected to the first adapter communication unit 312 via the signal line of the signal CLK2, and the terminal Tc6 is connected to the signal line DATA. The terminal Tc4 is connected to the terminal Td4 of the interchangeable lens 200, the terminal Tc5 is connected to the terminal Td5, and the terminal Tc6 is connected to the terminal Td6.
That is, the three types of signal lines R / W, CLK2, and DATA for performing communication of the first data communication system D1L are connected to the first adapter communication unit 312 and the first via the terminals Tc4 to Tc6 and the terminals Td4 to Td6. The lens communication unit 212 is connected.

As described above, communication of the first data communication system D1b and communication of the first data communication system D1L are performed between the first camera communication unit 112 and the first lens communication unit 212 via the first adapter communication unit 312. Is called. In the communication of the first data communication system D1b and the communication of the first data communication system D1L, for example, between the first camera communication unit 112 and the first lens communication unit 212 via the first adapter communication unit 312. Information of the optical system 220, a request command such as a control instruction, response data to the request command, and the like are communicated. Here, communication in the first data communication system D1b and the first data communication system D1L is referred to as “command data communication”.
The information of the optical system 220 is information indicating the type of the optical system 220 (information indicating the specifications, functions, optical characteristics, etc. of the optical system 220) or information indicating the driving state of the optical system 220.

As described above, the first adapter communication unit 312 in the adapter control unit 310 receives the camera control command output from the first camera communication unit 112 of the camera control unit 110 (in other words, the first reception unit). ) And a function of transmitting a lens control command for driving and controlling the drive element of the interchangeable lens 200 to the first lens communication unit 212 of the interchangeable lens 200 according to the content received by the first receiver (in other words, A first transmission unit), a function of receiving state information indicating the driving state of the drive element from the first lens communication unit 212 of the interchangeable lens 200 (in other words, the second reception unit), and reception by the second reception unit. A function of transmitting state information indicating the driving state of the driving element to the first camera communication unit 112 of the camera body 100 based on the content (in other words, the second transmission unit).
Further, the first adapter communication unit 312 shown in the present embodiment has a function of receiving the monitoring result notified from the second adapter communication unit 313 in addition to the communication function described above. Details of processing for controlling the second adapter communication unit 313 by the first adapter communication unit 312 will be described later.

  The second adapter communication unit 313 receives a pulse signal of the data communication system D2L (fourth communication standard) from the second lens communication unit 213. However, the second adapter communication unit 313 is configured not to execute communication based on the pulse signal with the second camera communication unit 113 via the data communication system D2b (third communication standard). This controls the second adapter communication unit 313 not to generate information that matches the communication standard (third communication standard) of the data communication system D2b based on the information included in the pulse signal of the data communication system D2L. Because. As a result, there is no data to be transmitted from the adapter side to the camera side via the data communication system D2b (third communication standard), so this communication is not executed. Further, the second adapter communication unit 313 monitors the operation state of the interchangeable lens 200 based on information included in the pulse signal of the data communication system D2L. If the second adapter communication unit 313 monitors the operation state of the interchangeable lens 200 based on the information included in the pulse signal, and determines that the second adapter communication unit 313 is different from the expected state, the second adapter communication unit 313 The fact that there is an abnormality in the operating state of the interchangeable lens 200 is notified.

The second adapter communication unit 313 and the second camera communication unit 113 perform communication of the second data communication system D2b via four types of signal lines of signals HREQ, HANS, HCLK, and HDATA. The terminal Tb8 is connected to the second adapter communication unit 313 via the signal line of the signal HREQ. The terminal Tb9 is connected to the second adapter communication unit 313 via the signal HANS signal line, the terminal Tb10 is connected to the signal HCLK signal line, and the terminal Tb11 is connected to the signal HDATA signal line. The terminal Tb8 is connected to the terminal Ta8 of the camera body 100, the terminal Tb9 is connected to the terminal Ta9, the terminal Tb10 is connected to the terminal Ta10, and the terminal Tb11 is connected to the terminal Ta11.
In other words, the four types of signal lines HREQ, HANS, HCLK, and HDATA for performing communication of the second data communication system D2b are connected to the second adapter communication unit 313 and the second through the terminals Tb8 to Tb11 and the terminals Ta8 to Ta11. The camera communication unit 113 is connected.

On the other hand, the second adapter communication unit 313 and the second lens communication unit 213 execute communication of the second data communication system D2L via two types of signal lines, signals HLP1 and HLP2. The terminal Tc7 is connected to the second adapter communication unit 313 via the signal line of the signal HLP1. The terminal Tc8 is connected to the second adapter communication unit 313 via a signal line for the signal HLP2. The terminal Tc7 is connected to the terminal Td7 of the interchangeable lens 200, and the terminal Tc8 is connected to the terminal Td8.
That is, the two types of signal lines HLP1 and HLP2 for performing communication of the second data communication system D2L are connected to the second adapter communication unit 313 and the second lens communication unit 213 via the terminals Tc7 to Tc8 and the terminals Td7 to Td8. Connected between.

  As described above, the communication of the second data communication system D2b and the communication of the second data communication system D2L are performed between the second camera communication unit 113 and the second lens communication unit 213 via the second adapter communication unit 313. Is called. In the communication of the second data communication system D2b and the communication of the second data communication system D2L, the second lens communication unit 213 is connected via the second adapter communication unit 313 based on the communication request signal of the second camera communication unit 113. For example, data indicating the position of the focus lens 222 is communicated. Here, the communication in the second data communication system D2b and the second data communication system D2L is referred to as “hot line communication”.

<Description of functional block configuration of camera system>
Next, a functional block configuration of the camera system 1 will be described with reference to FIG.
FIG. 4 is an example of a functional block diagram of the camera system. FIG. 4 is a functional block diagram showing the camera system 1 shown in FIG. In FIG. 4, parts corresponding to those in FIG. 3 are denoted by the same reference numerals, and part or all of the description thereof is omitted. In FIG. 4, from the viewpoint of easy viewing on the drawing, illustration of a part of the configuration shown in FIG. 3 is omitted (however, the configuration shown in FIG. 3 is the camera system shown in FIG. 4). 1). Further, the illustration of a configuration not shown in FIG. 3 is added.

As shown in FIG. 4, the camera system 1 includes a camera body 100, an interchangeable lens 200, and an adapter 300. In the following description, first, the configuration of each device (camera body 100, interchangeable lens 200, adapter 300) constituting the camera system 1 will be described, and thereafter each control (signal flow, etc.) will be described. .
(Configuration of interchangeable lens)
The interchangeable lens 200 includes a lens side mount 201 including a connecting portion 201s, a zoom operation ring 202, a lens control unit (CPU) 210, an optical system 220, and an optical system driving unit 230. The optical system 220 includes an aperture mechanism (aperture unit, aperture) 251 including aperture blades.
The zoom operation ring 202 is an annular operation reception unit that is rotatably disposed in the casing of the interchangeable lens 200 in order to change the focal length. That is, when the user operates (rotates) the zoom operation ring 202, the position of the zoom lens in the optical system 220 in the optical system 220 moves in accordance with the operation, and the focal length (zoom in accordance with the movement). State) changes.

The lens control unit 210 stores the image plane movement coefficient k in a nonvolatile memory provided therein. This “image plane movement coefficient” is unique information stored for each interchangeable lens 200, and is “a movement amount D of the focus lens 222 (FIG. 3) and a subject image that is displaced according to the movement amount”. Information k (= d / D) indicating the relationship with the amount of movement of the imaging position (the amount of change in the imaging position, the amount of movement of the image plane) d, which is well-known information. The lens control unit 210 stores a plurality (k1 to kn) of information on the image plane movement coefficient k for each focal length.
The lens control unit 210 can transmit the image plane movement coefficient k to the adapter 300. The image plane movement coefficient k can also be transmitted to the camera body 100 via the adapter 300. That is, in the interchangeable lens 200, the lens control unit 210 transmits the image plane movement coefficient k corresponding to the focal length set at the time of transmission to the adapter 300 and the camera body 100.
Note that the image plane movement coefficient k is “focus drive command 1” (first command information) generated by the camera body 100 and “focus drive command 2” generated by the adapter 300 in response to the focus drive command 1. "(Second command information) is used at each generation.
Information transmission processing of the image plane movement coefficient k from the interchangeable lens 200 to the adapter 300 and information reception processing of the focus drive command 2 transmitted from the adapter 300 are performed by the above-described “command data communication”. That is, the transmission and reception processing of these information is performed by the first lens communication unit 212 (FIG. 3).
The lens control unit 210 performs a conversion operation for converting the drive command value into a drive amount (rotation speed) of the AF drive unit 231 (motor or the like) based on the focus drive command 2 received from the adapter 300. The lens control unit 210 drives the AF driving unit 231 with the driving amount obtained by the conversion calculation.

The optical system drive unit 230 includes an AF drive unit 231 (FIG. 3) and an AF encoder 232 (FIG. 3).
The AF driving unit 231 is configured to move the focus lens 222 (in the direction specified in the focus control command) either before or after in the optical axis direction based on the control (converted driving amount) of the lens control unit 210 as described above. 3) is driven.
The AF encoder 232 supplies a pulse signal to the lens control unit 210 as the focus lens 222 moves. The AF encoder 232 has two different modes depending on the specifications of the encoder included in the AF encoder 232. Whether the AF encoder 232 is in one of the two modes can be identified by the lens type information (type information) of the interchangeable lens 200.
For example, the AF encoder 232 according to one aspect includes a single-phase pulse encoder. When the AF encoder 232 includes a single-phase pulse encoder, the AF encoder 232 outputs a single-phase pulse signal as the focus lens 222 moves. This pulse signal is information indicating the movement amount (position information) of the focus lens. However, the movement direction of the focus lens 222 cannot be detected from the signal output from the one-phase pulse encoder.

The AF encoder 232 according to the other aspect includes a two-phase pulse encoder. When the AF encoder 232 includes a two-phase pulse encoder, the AF encoder 232 outputs a two-phase pulse signal whose phases are shifted by 90 degrees as the focus lens 222 moves. This two-phase pulse signal is information indicating the amount and direction of movement of the focus lens (in other words, position information of the focus lens 222).
As described above, the pulse signal (one-phase pulse signal or two-phase pulse signal) generated by the AF encoder 232 is hot via the second lens communication unit 213 (FIG. 3). It is transmitted to the adapter 300 by line communication.

(Adapter configuration)
The adapter 300 includes a first mount 301 including a connection portion 301s, a second mount 302 including a connection portion 302s, an adapter control unit (CPU) 310, and an aperture interlocking lever driving unit 330.
The adapter control unit (CPU) 310 includes a first adapter communication unit 312 (FIG. 3), a second adapter communication unit 313 (FIG. 3), and an aperture control unit 314 (FIG. 3).
As described above, the first adapter communication unit 312 communicates with the first camera communication unit 112 of the camera body 100 (first communication standard), and the first lens communication unit 212 of the interchangeable lens 200. Command data communication based on communication (second communication standard). Through this command data communication, the first adapter communication unit 312 acquires information on the image plane movement coefficient defined in the second communication standard from the interchangeable lens 200. The acquired image plane movement coefficient information is stored in a nonvolatile memory in the adapter control unit 310. Then, the first adapter communication unit 312 converts the image plane movement coefficient information into information (state) that conforms to the first communication standard and transmits the information to the first camera communication unit 112. This conversion process is performed by using a predetermined conversion formula determined in advance in the adapter control unit 310 for each object to be communicated (each information to be communicated, in other words, each type of information to be communicated).
The first adapter communication unit 312 receives the above-described “focus drive command 1” (first command information) output from the first camera communication unit 112, and receives the received focus drive command 1 as the second Is converted into “focus drive command 2” (second command information) conforming to the communication standard of the first lens, and transmitted to the first lens communication unit 212.

  Here, a process performed by the adapter control unit 310 for converting the focus drive command 1 into the focus drive command 2 will be described in detail. The focus drive command 1 (first command information) includes information indicating the drive direction of the focus lens 222 (either forward or backward of the optical axis) and drive amount information. The drive amount information included in the focus drive command 1 is information on the number of pulses that is synonymous with the drive amount for the AF drive unit (motor) of the interchangeable lens having the same lens mount as the camera body 100. On the other hand, the focus drive command 2 that can be received by the interchangeable lens 200, which differs from the camera body 100 in terms of mount specifications and communication standards, represents the drive amount of the focus lens 222 by the amount of image plane movement (not the number of pulses). It includes information and information on the driving direction. Therefore, the adapter control unit 310 converts the “number of pulses” expressed by the focus drive command 1 into “image plane movement amount (change amount of image formation position)” (conversion calculation), and A process of converting the information indicating the driving direction into information conforming to the second communication standard is performed. When the adapter controller 310 performs a conversion operation to convert the number of pulses into the image plane movement amount, the image plane movement coefficient stored in the nonvolatile memory in the adapter controller 310 as described above is used. Information (the information on the image plane movement coefficient acquired from the interchangeable lens as described above / communication standard is different, but the information standard is the same as the information transmitted to the camera body 100). .

On the other hand, the second adapter communication unit 313 performs communication (third communication standard) with the second camera communication unit 113 of the camera body 100 as described above. Through this hotline communication, the second adapter communication unit 313 receives from the AF encoder 232 regarding the position of the focus lens 222 from the interchangeable lens 200 via the data communication system D2L defined in the above-described fourth communication standard. The pulse signal (hot line pulse signal) is received. The second adapter communication unit 313 detects the received hotline pulse signal. However, the second adapter communication unit 313 does not generate position information (serial communication data, hereinafter referred to as “generation position information”) indicating the position of the focus lens 222 based on the received (counted) pulse signal. In addition, the second adapter communication unit 313 does not send generation position information that is not generated to the camera control unit 110.
In short, the second adapter communication unit 313 generates position information (first position information) based on movement information (hotline pulse signal) of the focus lens 222 supplied from the interchangeable lens 200 as information to be transmitted to the camera body 100. It is something that does not.
When the second adapter communication unit 313 has a sufficient processing capacity, the received hot line pulse signal may be detected, or the number of pulses of the hot line pulse signal may be counted. Absent. Thereby, the position of the focus lens 222 is detected and used for some control in the adapter (for example, it is necessary to check whether the lens 200 is operating according to the drive command output from the adapter 300 to the lens 200). May be. However, even in this case, the generated position information is not sent to the camera body 100.

The first adapter communication unit 312 converts the lens type information acquired from the interchangeable lens 200 into information (state) that conforms to the first communication standard, and transmits the information to the camera body 100.
The first adapter communication unit 312 transmits control information (control command) for performing autofocus control (processing), such as the focus drive command 2 described above, to the interchangeable lens 200. The control command sent from the first adapter communication unit 312 to the interchangeable lens 200 includes a control command for executing or stopping the autofocus process.
The first adapter communication unit 312 sends a control command for executing or stopping the autofocus process to the interchangeable lens 200. The first adapter communication unit 312 performs autofocus processing in response to the operation mode of the camera body 100 transitioning to a state in which autofocus processing is performed (for example, the release button 132 (see FIG. 1) has been pressed halfway). Is sent to the interchangeable lens 200.
Further, the control command transmitted from the first adapter communication unit 312 to the interchangeable lens 200 includes a control command for sending or stopping the position information (one-phase or two-phase pulse signal) of the focus lens 222. For example, if the operation mode of the camera body 100 is set to the manual focus mode, the first adapter communication unit 312 causes the interchangeable lens 200 to output a one-phase or two-phase pulse signal from the encoder 232 to the adapter 300. A control command for prohibiting this is output. When receiving a control command indicating such prohibition, the lens control unit 210 controls the pulse signal line of the encoder 232 to be set to high impedance so that the one-phase or two-phase pulse signal cannot be output, for example. .

(Configuration of camera body)
The camera body 100 includes a camera body side mount 101 including a connection unit 101s, a shutter 102, a signal processing unit 103, an AF sensor 106, a camera control unit (CPU) 110, an operation receiving unit 130, an image processing unit 140, a display unit 150, A storage unit 160, a buffer memory unit 170, and a medium control unit 180 are provided.

  The camera control unit 110 controls each unit via the bus 199. A bus 199 connects each unit and transfers image data, control signals, and the like output from each unit.

  The shutter 102 passes or blocks (passes to the signal processing unit 103 side) the subject luminous flux that reaches the camera body 100 from the interchangeable lens 200 (optical system 200) via the adapter 300. Regulation).

  The signal processing unit 103 includes, for example, an image sensor 104 such as a CMOS and an AD conversion unit 105, and generates image data based on an optical image formed by a subject light beam. For example, the imaging element 104 converts an optical image formed on the light receiving surface (imaging surface) into an electrical signal and outputs the electrical signal to the AD conversion unit 105. The AD conversion unit 105 converts the electrical signal output from the image sensor 104 into a digital signal and outputs the digital signal to the buffer memory unit 170.

The AF sensor 106 is a sensor that detects a phase difference in an optical image reaching the camera body 100 from the interchangeable lens 200 (optical system 200) via the adapter 300. An optical image reaching the camera body 100 from the interchangeable lens 200 (optical system 200) via the adapter 300 reaches the AF sensor 106 via a half mirror (not shown), for example, and a phase difference is detected. . The detection value of the AF sensor 106 is set to a position where the camera control unit 110 performs autofocus (determination method based on phase difference) in-focus, and the focus lens 222 (AF lens) in the interchangeable lens 200 is in a focused state. This is used for detecting the amount of movement (defocus amount) to be moved.
In FIG. 4, the AF sensor 106 and the image sensor 104 are separated, but the AF sensor 106 and the image sensor 104 are integrated (for example, a part of the image sensor 104 is also used for the AF sensor 106). ) As an example, the AF sensor 106 may be configured to calculate a contrast evaluation value based on the output (image signal) of the image sensor 104 and perform a known contrast AF that performs AF based on the contrast evaluation value. . Alternatively, for example, an image pickup device in which a part of pixels of the image pickup device 104 is replaced with a phase difference detection device (in place of the image signal device), which is well known in Japanese Patent Application Laid-Open No. 2009-94881, for example, is used. The phase difference AF may be performed based on the output of the phase difference detection element. When integrated, a half mirror is not required.

The operation reception unit 130 receives an instruction operation from the user. The operation accepting unit 130 includes a power button 131 (see FIG. 1), a release button 132 (see FIG. 1), and a rear operation unit 133 (see FIG. 1, for example, a cross key and an OK key) arranged on the housing of the camera body 100. ) Operation information (operation input) and operation information by pressing an icon, a selection item, an OK button or the like on the operation screen displayed on the display unit 150 are received. The operation reception unit 130 outputs the received operation information to the camera control unit 110.
The release button 132 detects a user operation, and supplies a state signal indicating two states of a half-pressed state and a fully-pressed state by the detected operation to the camera control unit 110.
The back operation unit 133 detects a user operation, detects information for performing various settings by the detected operation, and supplies the detected information to the camera control unit 110.

  The display unit 150 is, for example, a liquid crystal display disposed on the back surface of the housing (on the opposite side of the adapter 300 in the perspective view of FIG. 1). The display unit 150 displays various information (for example, image data, operation screens, etc.).

  The storage unit 160 is an area for storing various information (for example, reference information and generation information). Specifically, the storage unit 160 stores various mode selection / restriction conditions, focus determination criteria, imaging conditions (for example, a program diagram), image processing conditions, display control conditions, image data, and the like. .

  The buffer memory unit 170 is an area for temporarily storing the digital signal output from the signal processing unit 103 (AD conversion unit 105).

  The image processing unit 140 generates image data from the digital signal stored in the buffer memory unit 170. The image data generated by the image processing unit 140 is continuously obtained in a state where the imaging instruction is not received in addition to the captured image data generated when the imaging instruction is received via the operation receiving unit 130. Through image data (hereinafter also referred to as a through image) is also included.

  Note that captured image data generated by the image processing unit 140 is stored in the storage unit 160 or the storage medium 400. Further, the through image generated by the image processing unit 140 is output to the display unit 150. The through image generated by the image processing unit 140 is used for focusing determination in autofocus (for example, a determination method based on a contrast method) by the camera control unit 110.

  In addition, the image processing unit 140 performs image processing on the captured image data stored in the storage unit 160 based on the image processing conditions stored in the storage unit 160.

  The medium control unit 180 writes information (for example, captured image data) to a removable storage medium 400 (for example, a memory card), reads information from the storage medium 400, or is stored in the storage medium 400. Controls erasure of information.

  The storage medium 400 is an external storage unit that is detachably connected to the camera body 100. For example, photographed image data is stored in the storage medium 400.

<Description of AF Control System>
Next, an AF control system in the camera system 1 will be described with reference to FIG.
FIG. 5 is a block diagram showing a control system for AF control. In the configuration shown in this figure, the main configuration of the AF control system is mainly shown, and the configuration related to communication processing in the camera body 100, the interchangeable lens 200, and the adapter 300 is omitted.

FIG. 5A shows the configuration of an AF control system that controls the in-focus state based on the result of detecting the detected position of the focus lens 222.
As described above, in the interchangeable lens 200, the AF driving unit 231 drives the focus lens 222 (AF lens) according to the control amount supplied via the adapter 300. The focus lens 222 moves by being driven by the AF drive unit 231. The focus lens 222 is controlled at a predetermined position so that the subject image to be AF-processed is focused on the reference imaging surface.
For example, a case of performing phase difference AF processing will be described.
The AF sensor 106 (104) detects the in-focus state based on the detected subject image. The AF processing unit 114 included in the camera control unit 110 detects the defocus amount based on the position of the focus lens 222 when the AF sensor 106 detects the in-focus state based on the image detected by the AF sensor 106. The AF processing unit 114 generates target control position information (target control amount) for moving the focus lens 222 to a position (target control position) at which the target subject is focused based on the detected defocus amount.

Further, the position of the focus lens 222 is detected by the AF encoder 232.
Information on the position of the focus lens 222 detected by the AF encoder 232 is supplied to the adapter control unit 310 (second adapter communication unit 313) by a pulse signal and converted into position information by the second adapter communication unit 313. The position information converted in the second adapter communication unit 313 is supplied to the camera control unit 110.
The position information of the focus lens 222 supplied to the camera control unit 110 generates a correction amount for correcting the target control position information (target control amount) by a calculation process by the correction unit 115 included in the camera control unit 110. The target control position information (target control amount) is information (target control amount) generated by the AF processing unit 114 as described above and corresponding to the target position to which the focus lens 222 is moved. The correction unit 115 generates a control amount obtained by correcting the target control position information (target control amount) for moving the focus lens 222 based on the generated correction amount. This corrected control amount is equivalent to the control amount supplied from the camera body 100 to the adapter 300.

In the adapter control unit 310, the first adapter communication unit 312 converts the control amount supplied from the camera body 100 into a movement amount for moving the focus lens 222 by a predetermined conversion coefficient, and supplies the converted amount to the interchangeable lens 200.
Then, the AF driving unit 212 moves the focus lens 222 based on the amount of movement for moving the focus lens 222 as described above.
For example, by performing feedback control using such a control system, the position of the focus lens 222 is brought close to the target control position, and the processing time of AF control until reaching a predetermined in-focus state is shortened.

  By the way, depending on the characteristics of the interchangeable lens 200 and the characteristics of the control configuration for controlling the interchangeable lens 200 from the camera body 100 via the adapter 300, the control system may become unstable before reaching a predetermined in-focus state. is there. In such a case, for example, when the position of the focus lens 222 is in the vicinity of the target control position and the control amount at that time becomes excessive, the focus lens 222 is moved to a position that jumps over the target control position. The case where it moves is assumed. For example, when the control error between the detected position information of the focus lens 222 and the target control position information exceeds a predetermined value, the generated control amount is larger than the amount required to reach the target control position. There may be cases where it becomes excessive.

A configuration for avoiding the case where the control system becomes unstable before reaching the predetermined in-focus state as described above will be described.
FIG. 5B shows the configuration of an AF control system that controls the in-focus state without performing correction according to the detected position of the focus lens 222. The description will focus on the differences from FIG.
In the control system for AF control shown in FIG. 5B, the adapter control unit 310 (second adapter communication unit 313) detects the hot line pulse signal detected by the AF encoder 232 of the interchangeable lens 200. The position information is not provided to the camera control unit 110.

Specifically, the second adapter communication unit 313 outputs information on the position of the focus lens 222 detected by the AF encoder 232 in the interchangeable lens 200 to the adapter 300 from the interchangeable lens 200 as a pulse signal (hot line pulse signal). Even if it is, the information of the position of the focus lens 222 according to the pulse signal is not generated. Therefore, the second adapter communication unit 313 does not generate position information (second position information) of the focus lens 222, so that there is no position information to be transmitted to the camera control unit 110. As a result, the camera control unit 110 cannot obtain information on the position of the focus lens 222 (second position information) from the second adapter communication unit 313. When the position information (second position information) of the focus lens 222 is obtained from the second adapter communication unit 313 (see FIG. 5A), the camera control unit 110 performs target control based on the position information. Although a correction amount for correcting the position information (target control amount) can be generated, the adapter 300 shown in the present embodiment does not transmit the position information (second position information) of the focus lens 222 to the camera body 100. In the camera body 100, the above correction amount is not generated.
However, even in the camera system 1 configured as described above, target control position information (target control amount) for moving the focus lens 222 on the basis of the image detected by the AF sensor 106 in the camera control unit 110 is obtained. Since it is generated, AF control can be performed. However, in order to avoid a situation where the control system becomes unstable before reaching a predetermined in-focus state, it is necessary to devise the adapter 300. Therefore, in the adapter control unit 310 of the present embodiment, when the above-described control amount (the target control amount for moving the focus lens 222 and the above-described focus drive command 1) received from the camera control unit is larger than a predetermined amount. Transmits the control amount to the interchangeable lens 200 as it is after the conversion process (conversion process to the focus drive command 2 described above) in the adapter 300. On the other hand, when the control amount (focus drive command 1) received from the camera control unit is less than the predetermined amount, the target amount is very short, so the control amount is directly converted in the adapter and transmitted to the interchangeable lens. Instead, a predetermined control amount (a slight control amount) is transmitted to the interchangeable lens as the focus drive command 2 among the converted control amounts. That is, when the focus lens 222 has been moved to a slight position to the target position, the movement of the focus lens 222 beyond that is used as a drive instruction for each small amount so that the focus lens 222 is driven slowly. . Thus, in the adapter control unit 310, by devising the lens drive control amount to be output to the interchangeable lens 200, it is possible to avoid the situation where the control system becomes unstable regardless of the presence or absence of the feedback control function described above. Stable focusing control can be performed.
If (focus drive command 1) is less than the predetermined amount, the minute predetermined drive amount (fixed value) prepared in advance in the adapter control unit 310 is replaced as the focus drive command 2 without performing conversion processing. You may make it output to a lens.

As described above, in the AF process in the camera system 1, the in-focus state can be controlled without performing correction according to the detected position of the focus lens 222.
In the AF control, as shown in FIG. 5B, the AF sensor is controlled by controlling the position of the focus lens 222 without feeding back the detected position information of the focus lens 222 to the camera control unit 110. The in-focus state can be detected at 106. In the camera control unit 110, AF control can be performed based on information detected by the AF sensor 106. As described above, the control amount for driving the focus lens cannot be corrected based on the detected position information of the focus lens 222, but basic AF control can be performed.

<Description of state transition>
Next, processing according to the present embodiment will be described.
First, the outline of the state transition according to the present embodiment will be described with reference to FIG.
FIG. 6 is a flowchart showing an overview of the state transition of the process related to the interchangeable lens according to the present embodiment.

First, when the main power of the camera body 100 is turned on with respect to the camera body 100, or when the adapter 300 is attached in a state where the main power of the camera body 100 is turned on, the adapter 300 is Under the control of the body 100, a “lens activation process” is executed (step S100).
Here, the “lens activation process” includes, for example, an attachment / detachment determination process of the camera body 100 with respect to the camera body side mount 101, an initialization process of the adapter 300 and the interchangeable lens 200 attached to the adapter 300, and power supply of each power supply system. Control processing, etc. Further, for example, in this lens activation process, the camera body 100 acquires information on the type and specification (function) of the interchangeable lens 200 attached to the camera body 100 via the adapter 300.

When the lens activation process is completed in step S100, the adapter 300 transitions to a “lens steady process” under the control of the camera body 100 (step S200).
The “lens steady process” is, for example, a state in which a photographing process after the lens activation process is completed is possible. In this lens steady process, the camera body 100 executes “steady communication” in which, for example, detection of the mounting state of the interchangeable lens 200 mounted via the adapter 300 and acquisition of information on the optical system are performed in a predetermined cycle. . This lens steady process will be described later with reference to FIG.

  Next, the camera body 100 or the adapter 300 determines whether or not an interrupt request is generated during the lens steady process (step S300). If it is determined in step S300 that there is no interrupt request, the adapter 300 continues the lens steady process under the control of the camera body 100. On the other hand, when it is determined in step S300 that there is an interrupt request, the camera body 100 or the adapter 300 transitions to the requested interrupt process (step S400). Here, the interrupt process is, for example, a shooting start process by a release operation, a process at the time of instantaneous power interruption, a shift to a low power consumption mode, or a power cut-off process by turning off the power. These processes will also be described later.

(Explanation of command data communication in regular lens processing)
Next, command data communication executed in the lens steady process (step S200 in FIG. 6) will be described.
FIG. 7 is a diagram illustrating an example of a communication sequence of command data communication in the lens steady process.
FIG. 7 shows an example of command data communication taking the camera system 1 in which the interchangeable lens 200 (CPU lens) and the camera body 100 are connected via an adapter 300 as an example. The adapter control unit 310 can periodically perform periodic communication with the camera control unit 110, and by executing this periodic communication, lens control is performed in response to a request from the camera control unit 110. The lens information (such as information on the optical system 220) acquired from the unit 210 is transmitted to the camera control unit 110.

For example, in the “lens steady process” illustrated in FIG. 7, the first adapter communication unit 312 communicates with the lens control unit 210 included in the interchangeable lens 200 at a cycle Tf (first communication cycle). And the second periodic communication that communicates with the camera control unit 110 included in the camera body 100 at a cycle Tm (second communication cycle) in an asynchronous relationship.
The first adapter communication unit 312 performs communication (first periodic communication) of the first data communication system D1L with the first lens communication unit 212 at a cycle Tf (for example, every 64 msec) (steps S2010 and S2020). .
Here, the communication (first regular communication) of the first data communication system D1L in the lens steady process is referred to as “lens steady communication”. Through this lens steady communication, the first adapter communication unit 312 acquires lens information (information of the optical system 220 (first information)) from the first lens communication unit 212.

The first adapter communication unit 312 generates lens information (information of the optical system 220 (second information)) to be transmitted to the first camera communication unit 112 based on the lens information acquired in step S2010 (step 2). S2015). For example, the first adapter communication unit 312 converts the lens information (such as information on the optical system 220) acquired in step S2010 into data that conforms to the communication standard of the first data communication system D1b, and performs first conversion. Information to be transmitted to the camera communication unit 112 is generated.
Similarly, the first adapter communication unit 312 generates and converts the information to be transmitted to the first camera communication unit 112 based on the lens information (such as information on the optical system 220) acquired in step S2020 (step S2025). ).
That is, the first adapter communication unit 312 generates lens information (information of the optical system 220 and the like) to be transmitted to the first camera communication unit 112 according to the communication timing of the lens steady communication (communication timing of the cycle Tf).

The first adapter communication unit 312 is asynchronous with the communication (first regular communication) cycle Tf with the interchangeable lens 200 in the first data communication system D1L with respect to the communication of the first data communication system D1L described above. The communication (second periodic communication) of the first data communication system D1b is executed with the first camera communication unit 112 at a period Tm (for example, every 16 msec) (steps S1010, S1015, S1020, S1025). This communication cycle Tm is a communication cycle faster than the communication cycle Tf.
Here, communication (second regular communication) of the first data communication system D1b in the lens steady process is referred to as “steady communication”. This steady communication includes a lens attachment / detachment detection process (lens attachment / detachment detection) and a steady data communication process (hereinafter, “steady data communication”).
The lens attachment / detachment detection process in each step is a process in which the first adapter communication unit 312 responds a detection result in response to a lens attachment / detachment detection instruction command from the first camera communication unit 112. The first adapter communication unit 312 detects the attachment / detachment of the interchangeable lens 200 based on whether there is a response to the steady lens communication from the first lens communication unit 212 and transmits the detection result to the first camera communication unit 112. .

The steady data communication in each step is a communication process in which the first camera communication unit 112 acquires lens information (such as information on the optical system 220) generated by the first adapter communication unit 312. That is, in steady data communication, the first camera communication unit 112 transmits a request command for requesting transmission of lens information (information of the optical system 220, etc.) to the first adapter communication unit 312 and receives it. Based on a response from the first adapter communication unit 312 (transmission from the adapter to the camera side), lens information (information of the optical system 220, etc.) from the interchangeable lens 200 via the adapter 300 is received (acquired). Since this request command is periodically transmitted in the steady data communication, the first camera communication unit 112 repeatedly performs the lens information acquisition (reception) operation every time the steady data communication is performed.
For example, the first camera communication unit 112 obtains the lens information (information of the optical system 220 / first information) acquired by the first adapter communication unit 312 before the lens steady communication in step S2010 by the steady data communication in step S1010. The lens information (second information) generated based on the above is acquired. In addition, the first camera communication unit 112 obtains lens information (information of the optical system 220 / first information) acquired by the first adapter communication unit 312 in the lens steady communication in step S2010 through the steady data communication in steps S1015 and S1020. The lens information (second information) generated based on the above is acquired. In addition, the first camera communication unit 112 generates a lens based on the lens information (such as information on the optical system 220) acquired by the first adapter communication unit 312 in the lens steady communication in step S2020 through the steady data communication in step S1025. Get information.
That is, the first adapter communication unit 312 transmits (responds) the lens information generated as described above to the first camera communication unit 112 at the period Tm of steady data communication.

As described above, in the command data communication, the adapter control unit 310 uses the camera control unit based on the lens information (information of the optical system 220 / first information) from the interchangeable lens 200 acquired by the lens steady communication with the period Tf. Lens information (second information) to be transmitted to 110 is generated. In addition, the adapter control unit 310 transmits the generated lens information (second information) to the camera control unit 110 by steady data communication with a period Tm.
As a result, the adapter control unit 310 ensures that the lens information acquired by the lens steady communication with the cycle Tf is generated without delay in the camera control unit 110 through the steady data communication with the cycle Tm that is asynchronous with the cycle Tf. Can be sent to.
Therefore, the adapter control unit 310 can transmit the lens information acquired from the lens control unit 210 to the camera control unit 110 without delay in response to a request from the camera control unit 110 by communicating with the camera control unit 110. it can.

7, the lens information (such as information on the optical system 220) transmitted to the first camera communication unit 112 in accordance with the communication timing of the lens steady communication (communication timing of the cycle Tf) is the first adapter communication. Although the process which the part 312 produces | generates was demonstrated, it is not restricted to this. For example, the first adapter communication unit 312 generates lens information (such as information on the optical system 220) to be transmitted to the first camera communication unit 112 according to the communication timing of regular data communication (communication timing of the cycle Tm). Also good.
As a result, the adapter control unit 310 determines the camera control unit according to the timing of the cycle Tm that is asynchronous with respect to the cycle Tf from the lens information (information of the optical system 220, etc.) acquired by the lens steady communication with the cycle Tf. The lens information to be transmitted to 110 can be generated, and the generated lens information can be transmitted to the camera control unit 110 by steady data communication.

  In addition, with reference to FIG. 7, the first adapter communication unit 312 has described a process in which the cycle Tf of communication with the lens control unit 210 and the cycle Tm of communication with the camera control unit 110 are in an asynchronous relationship. However, the cycle Tf and the cycle Tm may be synchronized.

(Description of command data communication and autofocus processing in autofocus control)
Next, command data communication will be described using autofocus processing as an example.
The camera control unit 110 detects the state signal of the release button 132 supplied from the operation receiving unit 130, and detects the release button half-pressed state and the release button full-pressed state. For example, the release button half-pressed state indicates a preparation state in which imaging is performed, and the release button full-pressed state indicates imaging start.
When the camera control unit 110 detects the half-pressed state of the release button from the state signal supplied from the release button 132, the camera control unit 110 changes the operation state (operation mode) to the state in which autofocus control (autofocus processing) is performed. To.
In performing the autofocus control, the camera control unit 110 first sets the above-described image plane movement coefficient k from the interchangeable lens 200 via the adapter 300 by the above-described hotline data communication (communication systems D1L and D1b). Information (image plane movement coefficient information converted into information (state) conforming to the first communication standard by the adapter 300 as described above) is received. In the camera control unit 110, a focus shift amount calculated based on an output from the above-described AF sensor 106 (including a case where the image sensor 104 is integrated) (in the case of phase difference AF, a defocus amount, a contrast AF). In this case, the above-described focus drive command 1 (first command information) is generated based on the contrast value. The camera control unit 110 uses the image plane movement coefficient k received from the interchangeable lens 200 when generating the focus drive command 1 (number of pulses, drive direction). More specifically, the image plane movement coefficient k is used for calculation when converting the amount of focus deviation into the number of pulses.

  The information on the image plane movement coefficient k is initially received by the camera body 100 by the first exchange (communication) between the “interchangeable lens 200-adapter 300-camera body 100” and stored in the memory in the camera control unit. . After that (when the camera is powered on), the camera body 100 receives the data through regular communication (periodic communication) between the “interchangeable lens 200-adapter 300-camera body 100”. The camera control unit 110 updates and stores the image plane movement coefficient k in the memory every time information on the image plane movement coefficient k is received by steady communication. For this reason, when generating the focus drive command 1, the camera control unit 110 performs the generation using the image plane movement coefficient k updated at that time. This point (the point at which the updated image plane movement coefficient k is used for the conversion calculation) is the same in the case of the conversion calculation (conversion calculation using the image plane movement coefficient k) performed by the adapter control unit 310 described above. is there.

Then, the camera control unit 110 sends the focus drive command 1 to the first data communication system D1b (in order to cause the AF drive unit 231 of the optical system drive unit 230 to perform autofocus processing based on the generated focus drive command 1. To the adapter 300 via command data communication).
Upon receiving this focus drive command 1, the adapter control unit 310 causes the first adapter communication unit 312 to perform autofocus processing (generation of the focus drive command 2 described above, etc.). In addition, the camera control unit 110 performs autofocus processing (output from the AF encoder 232 of the interchangeable lens 200) to the second adapter communication unit 313 via the first adapter communication unit 312 according to the control command sent to the first adapter communication unit 312. Control to perform a process for generating position information from the pulse signal thus generated.

  Alternatively, when the release of the release button half-pressed state is detected by the state signal supplied from the release button 132, the camera control unit 110 sets the operation state (operation mode) to a state where the autofocus process is completed. . In the control for completing the autofocus process, a control command from the camera control unit 110 is sent to each control target controlled to perform the autofocus process, as in the start of the autofocus process.

Alternatively, when the camera control unit 110 detects the release button full-pressed state based on the state signal supplied from the release button 132, the camera control unit 110 sets the imaging process to a state. In a state where the imaging process is performed, the camera control unit 110 controls each unit so as to hold the result of the autofocus process.
As described above, in the camera system 1, the autofocus process is controlled using command data communication.
Here, an example of control of the driving amount of the focus lens 222 using command data communication will be described with reference to FIG.
FIG. 8 is a flowchart showing control amount conversion processing for the interchangeable lens in AF control. The processing shown in this figure shows processing performed in the first adapter communication unit 312 of the adapter control unit 310.
The adapter control unit 310 generates the first generated based on the first control amount from the received “focus drive command 1” according to the “focus drive command 1 (first control command)” by the following process. 2 is converted to “focus drive command 2 (second control command)”.
Prior to the following processing, “focus drive command 1 (first control command including the first control amount)” corresponding to the detection result of the AF sensor 106 (focus detection unit) is generated in the camera body 100, and It is assumed that the generated “focus drive command 1” is periodically supplied to the adapter control unit 310.
Further, in the processing described below, the adapter control unit 310 generates a second control amount that has a smaller control amount (a reduced control amount) than the first control amount in response to the “focus drive command 1”. There is.

First, the adapter control unit 310 receives a “focus drive command 1 (first control command including the first control amount)” corresponding to the detection result of the AF sensor 106 (focus detection unit) from the camera body 100 ( Step S1910).
Based on “focus drive command 1 (first control command)”, adapter control unit 310 determines whether or not the first control amount satisfies a predetermined determination threshold (step S1915).
As a result of the determination in step S1915, when it is determined that the first control amount is less than the predetermined determination threshold (when it is determined that the first control amount is less than the predetermined control amount) (step S1915: No), the adapter control unit 310 Then, a second control amount having a smaller control amount than the first control amount (reduced first control amount) is generated (step S1920).

  On the other hand, as a result of the determination in step S1915, when it is determined that the first control amount satisfies the predetermined determination threshold (step S1915: Yes), the adapter control unit 310 performs the second control with the same control amount as the first control amount. A quantity is generated (step S1930). The adapter control unit 310 generates a “focus drive command 2 (second control command)” including the generated second control amount (step S1940), and transmits it to the interchangeable lens (step S1950). In the processing of the command data communication, the adapter control unit 310 communicates “focus drive command 1” based on the first communication standard, and communicates “focus drive command 2” based on the second communication standard. .

  In the process in step S1920, the adapter controller 310 determines a predetermined value that is lower than the first control amount when it is determined that the first control amount is less than the determined determination threshold. The second control amount may be generated.

  As described above, the adapter control unit 310 sets the second control amount that is lower than the first control amount in accordance with the first control amount indicated by the “focus drive command 1”, that is, the drive amount for moving the focus lens 222. The interchangeable lens 200 may be controlled based on the generated and reduced second control amount. By reducing the drive amount for moving the focus lens 222, the focus lens 222 can be moved slowly. In particular, when the drive amount of the focus lens 222 per unit time is relatively small, stable control can be performed. it can.

  Here, the process of transmitting the lens operation of the focus lens 222 of the interchangeable lens 200 to the camera body 100 by hotline communication will be described in more detail.

<Description of hotline communication>
As described above, “hot line communication” in the present embodiment indicates communication from the interchangeable lens 200 to the camera body 100 via the adapter 300. In the hotline communication, the third communication is performed between the “second data communication system D2b” that performs communication according to the third communication standard between the adapter 300 and the camera body 100, and between the interchangeable lens 200 and the adapter 300. The “data communication system D2L” performs communication according to a fourth communication standard different from the standard.

(Hot line communication of the second data communication system D2b)
The first adapter communication unit 312 controls the second adapter communication unit 313 to transmit lens position data to the second camera communication unit 113 via the terminals Tb8 to Tb11, that is, the signal lines HREQ, HANS, HCLK, and HDAT. Send it. In the present embodiment, communication performed between the second adapter communication unit 313 and the second camera communication unit 113 is referred to as “hot line communication of the second data communication system D2b”.
However, the second adapter communication unit 313 does not generate position information to be sent to the camera body 100 based on the hotline pulse signal. Therefore, in the present embodiment, there is no information indicating the position of the focus lens 222 provided to the camera control unit 110 via the adapter control unit 310 by “hot line communication of the second data communication system D2b”.

(Hot line communication of the second data communication system D2L)
The second adapter communication unit 313 receives the hot line pulse signal supplied from the second lens communication unit 213. In the present embodiment, communication performed between the second adapter communication unit 313 and the second lens communication unit 213 is referred to as “hot line communication of the second data communication system D2L”. The hot line pulse signal supplied from the second lens communication unit 213 is a pulse signal generated by the AF encoder 232 and includes information indicating the position of the focus lens 222.

  By the way, the hot line communication in the AF control provides communication for forming a return path for feeding back the position information of the focus lens 222 to be controlled by the auto focus control to the camera control unit 110. However, according to the form shown in the present embodiment, even if the position of the focus lens 222 included in the interchangeable lens 200 can be controlled by the control from the camera control unit 110, the position information of the focus lens 222 is obtained from the camera. The feedback path for feeding back to the control unit 110 cannot be used.

  Thus, according to the present embodiment, the adapter 300 can perform AF control without generating position information of the focus lens 222 and without notifying (transmitting) the camera body 100. The adapter 300 according to the present embodiment does not require a configuration for generating the position information of the focus lens 222 or a configuration for notifying the generated position information to the camera body 100. Therefore, the circuit configuration of the adapter 300 can be simplified. Miniaturization, power saving, and cost reduction can be achieved. In addition, since the adapter 300 according to the present embodiment can stably perform AF control even on interchangeable lenses having different characteristics, various types of interchangeable lenses can be appropriately functioned.

  Furthermore, the adapter control unit 310 can move the focus lens 222 slowly by driving the focus lens 222 as described above, and can stably perform AF control.

  Further, the adapter control unit 310 receives a first control command including a first control amount according to the detection result of the AF sensor 106 (focus detection unit) from the camera body 100, and according to the first control command. Then, the first control command is converted into the second control command including the second control amount generated based on the first control amount. Thereby, when communicating via the adapter 300, the adapter control part 310 produces | generates the 2nd control amount converted from the control amount (1st control amount) supplied from the camera body 100, and thereby an interchangeable lens. The control amount (second control amount) supplied to 200 can be adjusted. Even when the adapter 300 performs AF control without generating position information of the focus lens 222 and without notifying the camera body 100, the adapter 300 provides a control amount suitable for the interchangeable lens 200 to the interchangeable lens 200. Since the adapter 300 can be supplied, the adapter 300 can stably perform AF control even for interchangeable lenses having different characteristics.

Moreover, the adapter control part 310 produces | generates the 2nd control amount with less control amount than the 1st control amount (it reduced from the 1st control amount) according to the 1st control command. For example, when it is determined that the first control amount is less than the predetermined determination threshold, the adapter control unit 310 generates a second control amount that is smaller than the first control amount. Alternatively, when it is determined that the first control amount is less than the predetermined determination threshold, the adapter control unit 310 generates a predetermined amount that is smaller than the first control amount as the second control amount.
As described above, the adapter control unit 310 supplies the second control amount having a smaller control amount than the first control amount (reduced from the first control amount), so that the control system 310 can control the control system according to the first control amount. The characteristics can be adjusted. In the above case, the second control amount having a control amount smaller than the first control amount is supplied to the interchangeable lens 200 to be controlled via the adapter control unit 310, whereby the loop gain of the control system is controlled by the first control. It becomes possible to reduce adaptively according to the amount. As a result, the adapter control unit 310 can perform control without supplying an excessive control amount to the interchangeable lens 200.

In addition, when it is determined that the first control amount satisfies a predetermined determination threshold, the adapter control unit 310 generates a second control amount having the same control amount as the first control amount.
As described above, the adapter control unit 310 adjusts the characteristics of the control system according to the first control amount by supplying the second control amount having the same control amount as the first control amount and controlling the interchangeable lens 200. be able to. As described above, by adaptively controlling the loop gain of the control system according to the first control amount, the adapter control unit 310 can control without supplying an excessive control amount to the interchangeable lens 200. It becomes.

In addition, the adapter control unit 310 generates a second control command including the generated second control amount, and transmits the second control command to the interchangeable lens. In the above communication, the adapter control unit 310 communicates the first control command based on the first communication standard, and the second control command communicates based on the second communication standard.
As a result, even when the communication standard is different between the camera body 100 and the interchangeable lens 200, communication is possible between the camera body 100 and the interchangeable lens 200 by connecting via the adapter 300. . As a result, the adapter 300 can control the interchangeable lens 200 from the camera body 100 by this communication (command data communication), so that various types of interchangeable lenses can function properly. Become.

  In addition, a program for realizing the functions of the camera control unit 110, the lens control unit 210, or the adapter control unit 310 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in the computer. The processing of each unit described above may be performed by reading and executing the system. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it also includes those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or client in that case. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes a design and the like within the scope not departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 Camera system, 100 Camera body, 106 AF sensor, 110 Camera control part, 200 Interchangeable lens, 220 Optical system, 230 Optical system drive part, 300 Adapter, 301 1st mount (1st mount part), 302 2nd mount ( (Second mount part), 310 adapter control part, 312 first adapter communication part, 313 second adapter communication part

Claims (11)

A first mount part to which a camera body having a focus detection part for performing focus detection can be attached and detached;
A second mount part that is provided separately from the first mount part, and is capable of attaching and detaching an interchangeable lens having a focus adjustment mechanism including a focus lens that performs focus adjustment;
An adapter control unit capable of communicating with the camera body and communicating with the interchangeable lens;
The adapter controller is
Receiving the first control command generated by the camera body according to the detection result of the focus detection unit from the camera body;
Converting the first control command into the second control command;
While transmitting the second control command to the interchangeable lens,
The adapter, wherein the first position information of the focus lens corresponding to the movement information of the focus lens supplied from the interchangeable lens is not transmitted to the camera body. The adapter controller is
The adapter according to claim 1, wherein the generation of the first position information based on movement information of the focus lens is not executed. The adapter controller is
Receiving the first control command including the first control amount according to the detection result of the focus detection unit from the camera body;
According to the first control command, the first control command is converted to the second control command including a second control amount generated based on the first control amount. The adapter according to claim 1 or claim 2. The adapter controller is
The adapter according to claim 3, wherein the second control amount having a control amount smaller than the first control amount is generated in accordance with the first control command. The adapter controller is
The second control amount having a control amount smaller than the first control amount is generated when it is determined that the first control amount is less than a predetermined determination threshold value. 4. The adapter according to 4. The adapter controller is
When it is determined that the first control amount is less than the predetermined determination threshold, a predetermined amount having a control amount smaller than the first control amount is generated as the second control amount. The adapter according to any one of claims 3 to 5. The adapter controller is
The second control amount having the same control amount as the first control amount is generated when it is determined that the first control amount satisfies the predetermined determination threshold. The adapter according to any one of the above. The adapter controller is
The adapter according to any one of claims 3 to 7, wherein the second control command including the second control amount is transmitted to the interchangeable lens. The adapter controller is
Communicating the first control command based on a first communication standard;
The adapter according to any one of claims 1 to 8, wherein the second control command communicates based on a second communication standard. The adapter according to any one of claims 1 to 9,
The camera body attached to the first mount;
The interchangeable lens mounted on the second mount part;
A camera system comprising: A first mount part to which a camera body including a focus detection part for performing focus detection can be attached and detached, and an exchange provided with a focus adjustment mechanism that is provided separately from the first mount part and includes a focus lens for focus adjustment. An adapter control program for controlling an operation of an adapter control unit provided in an adapter, the second mount unit to which the lens can be attached and detached,
Receiving the first control command generated by the camera body according to the detection result of the focus detection unit from the camera body;
Converting the first control command into the second control command;
Transmitting the second control command to the interchangeable lens;
Have
The adapter control program, wherein the focus lens first position information corresponding to the movement information of the focus lens supplied from the interchangeable lens is not transmitted to the camera body.

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