JP2013172195A - Camera accessory, interchangeable lens, and adaptor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera accessory, an interchangeable lens, and an adaptor that are capable of operating appropriately even when power supply voltage supplied from a camera body and power supply voltage, at which an own device connected to the camera body operates, are different from each other.SOLUTION: A camera accessory, which is detachably attachable to a camera body, includes: a power supply voltage change part for changing power supply voltage supplied from the camera body based on the supplied power supply voltage; a communication part for performing predetermined communication by receiving the power supply voltage supplied from the power supply voltage change part; and a level shift part for changing, based on the power supply voltage supplied from the power supply voltage change part, a level of a communication signal transmitted from the camera body to the camera accessory and changing, based on the power supply voltage supplied from the camera body, a level of a communication signal transmitted from the camera accessory to the camera body.

Description

  The present invention relates to a camera accessory, an interchangeable lens, and an adapter.

Conventionally, camera accessories that operate with power supplied from the camera body, mainly interchangeable lenses, supply information about the interchangeable lenses or information for controlling the autofocus drive mechanism or aperture drive mechanism in addition to power supply. , Send and receive to and from the connected camera body.
The interchangeable lens camera system is used by changing the camera body and interchangeable lens. Therefore, even when a user purchases a new camera body or interchangeable lens, the user generally replaces the camera body or interchangeable lens that the user has previously with and uses it for a long period of time. By the way, with the times, the power supply voltage of the CPU that controls the operation of the camera body and the interchangeable lens is decreasing in order to reduce the power consumption. For this reason, when a lens interchangeable camera system is designed using a new CPU having a low power supply voltage, when the camera is connected to a lens interchangeable camera system having a power supply voltage higher than the power supply voltage of the designed CPU. In some cases, the power supply voltage and communication signals transmitted and received may not be matched.

  As a conventional technique, when a camera accessory driven by a power supply voltage different from the power supply voltage of the camera body is connected to the camera body, malfunction of the control circuit is prevented by stopping the operation of the camera accessory control circuit. It has been proposed. (For example, refer to Patent Document 1).

JP-A-62-220937

  However, in the camera accessory shown in Patent Document 1, when the power supply voltage supplied from the camera body to the camera accessory is different from the power supply voltage at which the camera accessory connected to the camera body operates, The operation will be stopped. Therefore, there is a problem that the connected camera accessory cannot be operated.

  The present invention has been made in view of such circumstances, and its purpose is that the power supply voltage supplied from the camera body is different from the power supply voltage at which the device connected to the camera body operates. However, an object is to provide a camera accessory, an interchangeable lens, and an adapter that enable an appropriate operation.

  The present invention has been made to solve the above-described problems, and the present invention provides a camera accessory that can be attached to and detached from a camera body, and the power supply voltage supplied from the camera body is changed to the supplied power supply voltage. Based on the power supply voltage changing unit that changes the voltage based on the power supply voltage, the communication unit that is supplied with the power supply voltage from the power supply voltage changing unit and that performs predetermined communication, and the power supply voltage supplied from the power supply voltage changing unit A level for changing the level of the communication signal transmitted from the body to the camera accessory and changing the level of the communication signal transmitted from the camera accessory to the camera body based on a power supply voltage supplied from the camera body A camera accessory comprising a shift unit.

  The present invention is the interchangeable lens, wherein the camera accessory in the above invention is an interchangeable lens.

  In the present invention, the camera accessory according to the present invention is an adapter installed between the camera body and the interchangeable lens, the first connection portion for connecting to the camera body, and the replacement A second connecting portion for connecting to the lens, and supplying a power supply voltage output from the power supply voltage changing portion to the interchangeable lens through the second connecting portion, and The adapter is characterized in that the communication signal is transmitted / received to / from an interchangeable lens.

  According to the present invention, even when the power supply voltage supplied from the camera body is different from the power supply voltage at which the device connected to the camera body operates, an appropriate operation can be performed.

It is a block diagram which shows the structure of the interchangeable lens 200 by 1st Embodiment of this invention. 3 is an example showing a circuit configuration of a power supply voltage changing unit 19; It is an example of the flowchart which the interchangeable lens 200 by 1st Embodiment switches a communication protocol based on a power supply voltage. It is a block diagram which shows the structure of the conventional interchangeable lens 210. FIG. It is a block diagram which shows the structure of the adapter 300 by 2nd Embodiment of this invention. It is an example of the flowchart by which the adapter 300 by 2nd Embodiment performs switching of a communication protocol and conversion of a communication protocol based on a power supply voltage.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram showing the configuration of a camera body 100 and an interchangeable lens 200 detachable from the camera body 100 according to the first embodiment of the present invention. In the first embodiment, the camera accessory is described by taking the interchangeable lens 200 as an example, but it may be an electronic viewfinder device, a microphone device, a flash device, or a communication device that can be attached to and detached from the camera body 100.

  In FIG. 1, the interchangeable lens 200 is a camera accessory that can be attached to and detached from the camera body 100, and is attached to the camera body 100 by connecting the connection portion 201 of the interchangeable lens 200 and the connection portion 101 of the camera body 100. Yes. The connection unit 101 and the connection unit 201 include connection terminals (see symbols a to f) that are electrically connected, and supply of power between the interchangeable lens 200 and the camera body 100 via the connection terminals and Communication signals are transmitted and received.

  The camera body 100 includes a battery 3, a DC / DC converter 4, a body CPU 5, and a connection unit 101. In addition, the camera body 100 has a configuration necessary for imaging and recording by other cameras such as an imaging unit, an image processing unit, and a storage unit, but is connected to an interchangeable lens in the description of the present embodiment. The other configurations are omitted.

The battery 3 is a main power source of the camera body 100 and is a secondary battery such as a lithium ion battery or a nickel metal hydride battery. Note that a primary battery such as an alkaline battery may be used as the battery 3. The DC / DC converter 4 changes the battery voltage V _BAT supplied from the battery 3 to a voltage V _dd for operating the body CPU 5 that controls the camera body 100 and outputs it. The body CPU 5 operates with the voltage V _dd output from the DC / DC converter 4 and controls the operation of the camera body 100. The body CPU 5 transmits and receives a communication signal for controlling the operation of the interchangeable lens 200 to and from the interchangeable lens 200. The connection unit 101 is supplied with a battery voltage V _BAT supplied from the battery 3, a voltage V _dd supplied from the DC / DC converter 4, and a communication signal transmitted / received between the body CPU 5 and the interchangeable lens 200.

Next, the configuration of the interchangeable lens 200 will be described.
The interchangeable lens 200 includes a lens 30, an AF driving circuit 23, an AF actuator 24, an AF lens unit 25, an AF encoder processing circuit 26, an aperture driving circuit 27, an aperture actuator 28, an aperture unit 29, a lens CPU 20, a level shift unit 18, and a power source. The voltage change part 19 and the connection part 201 are provided.

An optical image input from the lens 30 is output to the camera body 100 via the AF lens unit 25 and the aperture unit 29.
The AF drive circuit 23 drives the AF actuator 24 based on the control of the lens CPU 20 to operate the AF lens unit 25. The AF encoder processing circuit 26 detects position information of the AF lens in the AF lens unit 25 and outputs it to the lens CPU 20. The aperture driving circuit 27 drives the aperture actuator 28 based on the control of the lens CPU 20 to operate the aperture unit 29.

The connection unit 201 is connected to the connection unit 101 of the camera body 100. The connection unit 201 and the connection unit 101 include a plurality of electrical connection terminals. The connection terminal a12 of the connection unit 201 is connected to the connection terminal a6 of the connection unit 101, and the interchangeable lens 200 is supplied with a battery voltage _VBAT output from the battery 3 of the camera body 100. The connection terminal b13 of the connection unit 201 is connected to the connection terminal b7 of the connection unit 101, and the interchangeable lens 200 is supplied with the voltage V _dd output from the DC / DC converter 4 of the camera body 100. The connection terminals c14, d15, and e16 of the connection unit 201 are connected to the connection terminals c8, d9, and e10 of the connection unit 101, respectively, and communication signals are transmitted and received between the interchangeable lens 200 and the camera body 100. The connection terminal f17 of the connection unit 201 is connected to the connection terminal f11 of the connection unit 101, and the GNDs of the interchangeable lens 200 and the camera body 100 are connected to each other.

Here, the battery voltage V _BAT supplied from the battery 3 of the camera body 100 to the connection portion 201 of the interchangeable lens 200 is a high power system power supply voltage. The battery voltage V _BAT is supplied to the AF drive circuit 23 and the aperture drive circuit 27 of the interchangeable lens 200 via the connection terminal a6 and the connection terminal a12, respectively. The voltage V _dd supplied from the DC / DC converter 4 of the camera body 100 to the connection part 201 of the interchangeable lens 200 is a logic power supply voltage. This voltage V _dd is supplied to the power supply voltage changing unit 19, the level shift unit 18, and the AF encoder processing circuit 26 of the interchangeable lens 200 via the connection terminal b7 and the connection terminal b13, respectively.

  A communication signal transmitted and received between the connection unit 201 and the connection unit 101 communicates lens information of the interchangeable lens 200 and optical system control information for controlling the operations of the AF lens unit 25 and the aperture unit 29. Signal. For example, the lens information of the interchangeable lens 200 includes information such as a lens configuration, an aperture configuration, or an open F value, position information of the AF lens, and the like, and is transmitted from the interchangeable lens 200 to the camera body 100. Further, the optical system control information of the interchangeable lens 200 includes the optical image output from the interchangeable lens 200 to the camera body 100 and the AF lens based on the setting information, operation, etc. for shooting set in the camera body 100. Drive control information and aperture switching control information. The optical system control information of the interchangeable lens 200 is transmitted from the camera body 100 to the interchangeable lens 200. Based on communication signals transmitted and received between the connection unit 201 and the connection unit 101, the AF drive circuit 23 operates and focuses the lens of the AF lens unit 25, and the aperture drive circuit 27 performs an aperture switching operation. To control.

A voltage V _dd output from the DC / DC converter 4 of the camera body 100 is supplied to and supplied to the power supply voltage changing unit 19 via the connection unit 101 of the camera body 100 and the connection unit 201 of the interchangeable lens 200. . Power supply voltage change section 19, based on the voltage input, and outputs the change the voltage to the voltage V _cc which lens CPU20 operates.
For example, when the camera body 100 that operates at the voltage V _dd = 5.0 V is connected to the interchangeable lens 200 that operates at the voltage V _cc = 3.3 V, the power supply voltage changing unit 19 receives the input voltage V Step down _dd = 5.0V to voltage _Vcc = 3.3V and output. When the camera body 100 operating at the voltage V _dd = 3.3V is connected to the interchangeable lens 200 operating at the voltage V _cc = 3.3V, the power supply voltage changing unit 19 receives the input voltage V _The voltage V _cc = 3.3V is output without changing the voltage of _dd = 3.3V.

The lens CPU 20 is a CPU that controls the operation of the interchangeable lens 200, and includes a power supply voltage detection unit 22 and a communication unit 21.
The power supply voltage detection unit 22 detects the voltage value of the voltage V _dd supplied from the DC / DC converter 4 via the connection unit 201 of the interchangeable lens 200 and the connection unit 101 of the camera body 100. The power supply voltage detection unit 22 _divides the voltage V _dd by the resistor R1 and the resistor R2, inputs the _divided voltage to the A / D conversion input port, digitally converts the input voltage, and calculates a voltage value based on the converted value. To detect. The power supply voltage detection unit 22 outputs the detected result to the communication unit 21.
The communication unit 21 transmits / receives lens information and optical system control information of the interchangeable lens 200 to / from the body CPU 5 of the camera body 100 via the connection unit 201 of the interchangeable lens 200 and the connection unit 101 of the camera body 100. The lens CPU 20 sends control signals for controlling the operations of the AF lens unit 25 and the aperture unit 29 to the AF drive circuit 23 and the aperture drive circuit 27 based on the lens information and the optical system control information transmitted and received by the communication unit 21, respectively. Output. In addition, the communication unit 21 performs communication protocol switching or communication protocol conversion based on the voltage V _dd supplied from the DC / DC converter 4 detected by the power supply voltage detection unit 22.

The level shift unit 18 is connected between the communication unit 21 and the connection unit 201 of the lens CPU 20, and the voltage V _dd supplied from the DC / DC converter 4 and the voltage output from the power supply voltage changing unit 19. _Vcc is supplied. Then, the level shift unit 18 changes the signal level of the communication signal output from the communication unit 21 according to the voltage V _dd supplied from the DC / DC converter 4 and outputs the signal level to the connection terminal c14 of the connection unit 201. . Further, the level shift unit 18 changes the signal level of the communication signal input from the connection terminals d15 and e16 of the connection unit 201 in accordance with the voltage _Vcc output from the power supply voltage change unit 19 to change the level of the lens CPU 20. Input to the communication unit 21. Thereby, the signal level of the communication signal input to the body CPU 5 becomes the signal level of the power supply voltage V _dd of the body CPU 5, and the signal level of the communication signal input to the lens CPU 20 is the signal level of the power supply voltage V _cc of the lens CPU 20. become.

Then, in the first embodiment, the interchangeable lens 200, and the level of the communication signal transmitted and received between the interchangeable lens 200 and camera body 100, and a voltage _{V cc} which lens CPU20 operates, from the camera body 100 The operation to be changed based on the supplied voltage V _dd will be described. As an example, with respect to the interchangeable lens 200 that operates at a voltage V _cc = 3.3 V (A system), it operates at a voltage V _dd = 5.0 V (B system) and a voltage V _dd = 3.3 V (A system). A case where two types of camera bodies 100 are connected will be described. Here, the A system is an interchangeable lens camera system that operates at a voltage of 3.3V, and the B system is an interchangeable lens camera system that operates at a voltage of 5.0V.

1) When the interchangeable lens 200 of the A system (voltage V _cc = 3.3V) and the camera body 100 of the B system (voltage V _dd = 5.0V) are connected.
The connection part 201 of the interchangeable lens 200 is connected to the connection part 101 of the camera body 100, and supply of power supply voltage and transmission / reception of communication signals are performed via connection terminals between the connection part 201 and the connection part 101. The voltage V _dd = 5.0 V supplied from the DC / DC converter 4 of the camera body 100 is input to the power supply voltage changing unit 19 via the connection terminal b7 of the connection unit 101 and the connection terminal b13 of the connection unit 201. The The power supply voltage changing unit 19 steps down the input voltage V _dd = 5.0 V to a voltage V _cc = 3.3 V at which the lens CPU 20 of the interchangeable lens 200 operates, and outputs the voltage.

Next, the level shift unit 18 determines the signal level of the communication signal transmitted and received between the interchangeable lens 200 of the A system and the camera body 100 of the B system as the voltage V _{cc of the} A system and the voltage V _{dd of the} B system. Based on the above, the output is changed as follows.
The level shift unit 18 changes the communication signal output from the lens CPU 20 at the signal level of the voltage V _cc = 3.3 V to the signal level of the voltage V _dd = 5.0 V, and connects the connection unit 201 and the connection unit 101. To the body CPU 5. Further, the level shift unit 18 outputs a communication signal output from the body CPU 5 at the signal level of the voltage V _dd = 5.0V and input via the connection unit 101 and the connection unit 201 to the voltage V _cc = 3.3V. The signal level is changed and input to the lens CPU 20.

Therefore, when the camera body 100 of the B system is connected to the interchangeable lens 200 of the A system, in the interchangeable lens 200 of the A system, the power supply voltage changing unit 19 changes the voltage V _dd = 5.0V to the voltage V _cc = 3.3V. Then, the level shift unit 18 changes the signal level of the communication signal based on the voltage V _dd = 5.0 V and the voltage V _cc = 3.3 V, respectively. As described above, when the interchangeable lens 200 and the camera body 100 of different power supply systems are connected, the power supply voltage and the signal level of the communication signal are appropriately changed.

Next, in the first embodiment, an operation when the interchangeable lens 200 of the power supply voltage of the A system that is the same system and the camera body 100 of the A system are connected will be described.
2) When the interchangeable lens 200 of the A system (voltage V _cc = 3.3V) and the camera body 100 of the A system (voltage V _dd = 3.3V) are connected.
The voltage V _dd = 3.3 V supplied from the DC / DC converter 4 of the camera body 100 is input to the power supply voltage changing unit 19 via the connection terminal b7 of the connection unit 101 and b13 of the connection unit 201. The power supply voltage changing unit 19 outputs the input voltage V _dd = 3.3 V as the voltage V _cc = 3.3 V at which the lens CPU 20 of the interchangeable lens 200 operates.

Next, the level shifter 18 determines the signal level of the communication signal transmitted and received between the interchangeable lens 200 of the A system and the camera body 100 of the A system as the voltage V _cc of the A system and the voltage V _{dd of the} A system. Change based on each. In this case, since the voltage V _dd = voltage V _cc = 3.3 V, the signal level of each communication signal is output at the signal level of the voltage V _dd = voltage V _cc = 3.3 V in the level shift unit 18, Transmission / reception is performed between the interchangeable lens 200 of the A system and the camera body 100 of the A system.

Therefore, when the A system camera body 100 having the same power supply voltage is connected to the interchangeable lens 200 of the A system, the power supply voltage changing unit 19 of the interchangeable lens 200 of the A system has the voltage V _dd = 3.3 V and the voltage V _cc = The level shift unit 18 _sets the signal level of the communication signal to a signal level of voltage V _dd = voltage V _cc = 3.3V. Thus, even when the interchangeable lens 200 and the camera body 100 of the same power supply system are connected, the power supply voltage and the signal level of the communication signal are appropriately changed.

Next, an example of the circuit of the power supply voltage changing unit 19 and the operation of the circuit will be described with reference to FIG.
Terminals I 1 and I 2 are input terminals of the power supply voltage changing unit 19. The terminal I1 is connected to the connection terminal b13 of the connection unit 201, and receives the voltage _Vdd . The terminal I2 is connected to the GND of the connection terminal f17 of the connection unit 201. The terminal OT1 is an output terminal of the power supply voltage change section 19 supplies the voltage _{V cc} to the lens CPU20 and the level shift unit. The terminal I1 is connected to the anode terminal of the diode D1, and the cathode terminal of the diode D1 is connected to the IN terminal of the regulator 51 and one end of the capacitor C1. The other end of the capacitor C1 is connected to the terminal I2 (GND). The OUT terminal of the regulator 51 is connected to the terminal OT1 and one end of the capacitor C2. The other end of the capacitor C2 and the GND terminal of the regulator 51 are connected to the terminal I2 (GND), respectively.

The terminal I1 is connected to the source terminal of the PMOS transistor Tr3 and one end of the resistor R8. The other end of the resistor R8 is connected to the gate terminal of the PMOS transistor Tr3, and the drain terminal of the PMOS transistor Tr3 is connected to the terminal OT1.
Further, the terminal I1 is connected to one end of the resistor R3 and one end of the resistor R6. The other end of the resistor R3 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the terminal I2 (GND). One end of the resistor R5 is connected to a connection point between the resistors R3 and R4, and the other end of the resistor R5 is connected to the base terminal of the transistor Tr1.

  The emitter terminal of the transistor Tr1 is connected to the terminal I2 (GND). The collector terminal of the transistor Tr1 is connected to the other end of the resistor R6 whose one end is connected to the terminal I1 and one end of the resistor R7, and the other end of the resistor R7 is connected to the base terminal of the transistor Tr2. The emitter terminal of the transistor Tr2 is connected to GND. The collector terminal of the transistor Tr2 is connected to one end of the resistor R9. The other end of the resistor R9 is connected to the other end of the resistor R8 whose one end is connected to the terminal I1 and the gate terminal of the PMOS transistor Tr3. Connected to 51 CE (chip enable) terminals.

Therefore, in the circuit of FIG. 2, the voltage V _dd input to the terminal I1 is _divided by the resistors R3 and R4, and the divided voltage is input to the base terminal of the transistor Tr1 via the resistor R5. ON and OFF of the transistor Tr1 is controlled. The controlled collector voltage of the transistor Tr1 is input to the base terminal of the transistor Tr2 via the resistor R7, and the ON / OFF of the transistor Tr2 is controlled. The regulator 51 is a voltage regulator that steps down the input voltage to 3.3V and outputs it, and is enabled when the CE terminal is at a high level. When the gate voltage of the PMOS transistor Tr3 is low, the PMOS transistor Tr3 is turned on and the source terminal voltage _Vdd is output to the drain terminal. Then, by controlling ON and OFF of the transistor Tr2, the CE terminal of the regulator 51 and the gate terminal of the PMOS transistor Tr3 are controlled. By this control, the voltage _Vcc output to the terminal OT1 is output by switching the output of the OUT terminal of the regulator 51 and the output of the drain terminal of the PMOS transistor Tr3.

Next, in the circuit shown in FIG. 2, the operation for each of the input voltage V _dd = 5.0 V and the input voltage V _dd = 3.3 V will be described.
First, when the voltage V _dd = 5.0 V is input in the circuit shown in FIG. 2, the operation is as follows, and the voltage V _cc = 3.3 V is output.
The base terminal of Tr1 in FIG. 2 is divided so that (R3 / (R3 + R4)) = 0.15 in the resistor R3 and the resistor R4. Therefore, when the voltage V _dd = 5.0 V, the voltage at the base terminal of the transistor Tr1 is (R3 / (R3 + R4)) × V _dd = 0.75 V, and the transistor Tr1 is turned on. When the transistor Tr1 is turned on, the base terminal of the transistor Tr2 is at the GND level (Low), so that the transistor Tr2 is turned off. When the transistor Tr2 is turned off, the voltage V _dd = 5.0 V (High) between the gate terminal of the PMOS transistor Tr3 and the CE terminal of the regulator 51. Therefore, the PMOS transistor Tr3 is turned off and the voltage V DD is supplied from the OUT terminal of the regulator 51. A voltage stepped down from _dd = 5.0V to 3.3V is output as the voltage _Vcc .

When the voltage V _dd = 3.3V is input in the circuit shown in FIG. 2, the operation is as follows, and the voltage V _cc = 3.3V is output.
The base terminal of Tr1 in FIG. 2 is divided so that (R3 / (R3 + R4)) = 0.15 in the resistor R3 and the resistor R4. Therefore, when the voltage V _dd = 3.3V, the voltage at the base terminal of the transistor Tr1 is (R3 / (R3 + R4)) × V _dd = 0.495V, and the transistor Tr1 is turned off. When the transistor Tr1 is turned off, the base terminal of the transistor Tr2 becomes the voltage V _dd = 3.3 V (High), so that the transistor Tr2 is turned on. When the transistor Tr2 is turned on, the gate terminal of the PMOS transistor Tr3 and the CE terminal of the regulator 51 are at the GND level (Low). Therefore, no voltage is output to the OUT terminal of the regulator 51, and the PMOS transistor Tr3 is turned on and turned on. V _dd = 3.3V is output as the voltage V _cc .

Thus, in the circuit shown in FIG. 2, when the voltage V _dd = 5.0 V is input, the output is switched to the output of the regulator 51 to output the voltage V _cc = 3.3 V, and the voltage V _dd = 3 When .3V is input, the output is switched to the output of the PMOS transistor Tr3, and the voltage _Vcc = 3.3V is output.

As described above, the circuit of the power supply voltage changing unit 19 shown in FIG. 2 is not the configuration of the regulator 51 alone, but the configuration of switching the outputs of the regulator 51 and the PMOS transistor Tr3. With this circuit configuration, the power supply voltage changing unit 19 can output an appropriate voltage even when the camera body 100 and the interchangeable lens 200 of the system having the same power supply voltage are connected. Assuming the case of the configuration of only the regulator 51, the power supply voltage change section 19 to which the voltage V _dd is input, even if an attempt is output at the voltage V _dd, the voltage that is actually output, the voltage V _dd A voltage drop corresponding to the dropout voltage of the regulator 51 occurs. A general voltage regulator with high voltage accuracy has a large dropout voltage that is a difference between an input voltage and an output voltage, and thus it is difficult to stably operate the interchangeable lens 200. In order to solve this problem, the power supply voltage changing unit 19 includes a circuit that outputs the voltage _Vdd through-connected using the PMOS transistor Tr3 in parallel with the regulator 51. The PMOS transistor Tr3 uses a transistor (FET) having a sufficiently small ON resistance.

Next, a case will be described in which the interchangeable lens 200 transmits / receives a communication signal to / from the camera body 100 by switching the communication protocol when the communication protocol is different between the A system and the B system.
When the camera body 100 and the interchangeable lens 200 are connected, it is necessary to operate at high speed and stably so as not to impair the operability of the user. Therefore, communication is performed by finely standardizing a communication protocol for transmitting and receiving data relating to lens control between the camera body 100 and the interchangeable lens 200. Therefore, in the A system and the B system that are controlled using CPUs having different operating voltages, it is desirable to standardize and apply a communication protocol optimized for each operating voltage CPU. Therefore, the camera body 100 and the interchangeable lens 200 having a communication protocol corresponding to the power source of the A system and the camera body 100 and the interchangeable lens 200 having a communication protocol corresponding to the power source of the B system can be connected beyond the system. In addition to changing the power supply voltage and the signal level of the communication signal, it is necessary to change the communication protocol.

The power supply voltage detection unit 22 detects the voltage value of the voltage V _dd output from the DC / DC converter 4 of the camera body 100 and supplied via the connection unit 101 and the connection unit 201.
The power supply voltage detection unit 22 includes a resistor R1 and a resistor R2 for _dividing the voltage _Vdd, and inputs the divided voltage to the A / D converter input terminal of the lens CPU 20 to detect a digitally converted voltage value. To do. The reason why the voltage V _dd is divided is to prevent a voltage higher than the voltage V _cc for operating the lens CPU 20 from being input to the A / D conversion port of the lens CPU 20. For example, when the voltage V _dd = 5.0 V is supplied from the camera body 100 to the lens CPU 20 operating at the voltage V _cc = 3.3 V, (R2 × 5.0 / (R1 + R2)) <3.3 The resistor R1 and the resistor R2 are designed so that Since the divided voltage is input to the A / D conversion port of the lens CPU 20, the voltage value detected by digital conversion is a value obtained by multiplying the actual voltage V _dd by (R2 / (R1 + R2)). It is.

The power supply voltage detection unit 22 outputs the detected voltage value of the voltage V _dd to the communication unit 21. The communication unit 21 has functions of communication protocols of the A system and the B system, and switches the communication protocol based on the voltage value of the voltage V _dd input from the power supply voltage detection unit 22. That is, the communication unit 21, the voltage _{V dd} that is input from the power supply voltage detection unit 22, whether the voltage _V dd = 3.3V of the A system or the B system whether a voltage _V dd = 5.0V The comparison is made by comparing with a preset threshold value, and the communication protocol of the A system and the communication protocol of the B system are selected and switched.

FIG. 3 shows an operation in which the interchangeable lens 200 of the A system (voltage V _cc = 3.3V) is connected to the camera body 100 and the camera body 100 is turned on by the user, and then the communication protocol is selected and switched. FIG.
First, the voltage V _dd is input from the camera body 100 to the power supply voltage changing unit 19 (step S11). Next, based on the voltage V _dd supplied from the camera body 100, the power supply voltage changing unit 19 supplies the voltage V _cc in the interchangeable lens 200 (step S12). Subsequently, the power supply voltage detector 22 inputs the voltage value of the voltage V _dd into the A / D conversion port and digitally converts it (step S13).

Here, the communication unit 21 determines whether or not the voltage value of the voltage V _dd input from the power supply voltage detection unit 22 is equal to or lower than the power supply voltage of the interchangeable lens 200 of the A system (step S14). When the determination result of step S14 is YES, the communication unit 21 switches to the communication protocol of the A system. That is, when the voltage V _dd is the power supply voltage of the same A system, the communication unit 21 switches to the communication protocol of the A system (step S15). On the other hand, when the determination result of step S14 is NO, the communication unit 21 switches to the communication protocol of the B system. That is, when the voltage V _dd is the power supply voltage of the B system that is higher than the power supply voltage of the A system, the communication protocol is switched to the communication protocol of the B system (step S16).
Next, the communication unit 21 starts communication with the body CPU 5 of the camera body 100 using the communication protocol of the A system or the communication protocol of the B system switched in step S15 or step S16 (step S17).

  As described above, in the first embodiment, even when the camera body 100 that operates with different power supply voltages and the interchangeable lens 200 are connected, the power supply voltage changing unit 19 and the level shift unit 18 include the interchangeable lens. The power supply voltage at which the camera 200 operates and the level of the communication signal transmitted and received between the camera body 100 and the interchangeable lens 200 are appropriately changed based on the power supply voltage supplied from the camera body 100. Therefore, the interchangeable lens 200 can operate appropriately. Further, even when the camera body 100 and the interchangeable lens 200 having different communication protocols corresponding to different power supply voltages are connected, the communication unit 21 uses the communication protocol based on the power supply voltage supplied from the camera body 100. By switching and communicating, the interchangeable lens 200 can perform an appropriate operation.

  As described above, in the first embodiment, the interchangeable lens 200 changes the power supply voltage, changes the signal level of the communication signal, and switches the protocol of the communication signal. Therefore, when a user newly purchases an interchangeable lens 200 having a different power supply voltage system, the user can use the camera body 100 without purchasing a new one. By the way, in order to connect and operate the camera body 100 and the interchangeable lens 200 that simply operate at different voltages, the camera body 100 includes a plurality of power supplies and selects and supplies the power supply voltage to the interchangeable lens 200. Also good. In this case, it is necessary to provide the camera body 100 with a plurality of power supplies having a capacity sufficient to operate the camera body 100 and the interchangeable lens 200. In contrast to this, in the first embodiment, the interchangeable lens 200 only needs to include a power supply changing unit having a capacity sufficient to operate only the effect-related diagram 200. And cost can be reduced.

Second Embodiment
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. First, as a comparison in explaining the second embodiment, FIG. 4 shows an example of the configuration of the interchangeable lens 210 and the camera body 110 that operate at the same power supply voltage that does not include the invention of the first embodiment. Show. FIG. 5 is an example showing configurations of the interchangeable lens 210, the camera body 100, and the adapter 300 in the second embodiment. As shown in FIG. 5, in the second embodiment, the power supply voltage change and the communication signal level or the communication protocol in the first embodiment are changed between the interchangeable lens 210 and the camera body 100. This is a configuration provided in the adapter 300 that is connected and installed. Therefore, when the interchangeable lens 210 and the camera body 100 of different power supply voltage systems are connected, the adapter 300 is connected between them, the adapter 300 changes the power supply voltage and supplies it to the interchangeable lens 210, and the adapter 300 communicates. Perform signal changes and relay to communicate.
4 and 5, parts corresponding to those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

  As shown in FIG. 4, the interchangeable lens 210 and the camera body 110 having the same power supply system are connected to each other through a connection part 211 and a connection part 111. The connection unit 211 and the connection unit 111 correspond to the connection unit 201 and the connection unit 101 illustrated in FIG. 1, and a plurality of electrical connections are provided in the same manner as the connection unit 201 and the connection unit 101 are provided. A connection terminal to be connected is provided. The interchangeable lens 210 performs a predetermined operation by supplying power and transmitting / receiving a communication signal between the interchangeable lens 210 and the camera body 110 via the connection terminal.

Next, in the second embodiment, as shown in FIG. 5, an adapter 300 is installed between the interchangeable lens 210 and the camera body 100. An interchangeable lens 210 in FIG. 5 is the interchangeable lens 210 shown in FIG. 4 and is connected by a system having the same power supply voltage as that of the camera body 110. The connection with the camera body 100 is not supported.
The adapter 300 is, for example, a mount adapter that allows the interchangeable lens 210 and the camera body 100, which are different mounts, to be connected. The adapter 300 includes two connection parts, a connection part 301 and a connection part 302. The connection unit 301 is connected to the connection unit 101 of the camera body 100, and the connection unit 302 is connected to the connection unit 211 of the interchangeable lens 210.

The connection terminals included in the connection unit 301 correspond to the connection terminals included in the connection unit 201 illustrated in FIG. 1, and each of the battery voltage V _BAT , the voltage V _dd , the communication signal, and the GND included in the connection unit 101. Connected with connection terminal.
Connection terminals a43 and f48 of the connecting portion 302 is connected to the connection terminals a12 and f17 of the connection portion 211, provided to the interchangeable lens 210 to the battery voltage _{V BAT} and GND supplied adapter 300 is relayed from the camera body 100 To do. Connection terminal b44 of the connecting portion 302 is connected to the connection terminal b13 of the connecting portion 211, and supplies the output voltage _{V cc} power supply voltage change section 19 to the interchangeable lens 210. The connection terminals c45, d46, and e47 of the connection unit 302 are connected to the connection terminals c14, d15, and e16 of the connection unit 211, respectively. Thereby, a communication signal transmitted / received to / from the camera body 100 is transmitted / received to / from the interchangeable lens 210 via the adapter 300.

As in the configuration shown in FIG. 1, the power supply voltage changing unit 19 uses the voltage V _dd supplied from the DC / DC converter 4 to operate the lens CPU 20 of the interchangeable lens 210 to be connected and the adapter CPU 42 to operate. Change to voltage _Vcc and output. The output voltage V _cc is supplied to the interchangeable lens 210 via the connection terminal b44 of the connection unit 302 and b13 of the connection unit 211.

The adapter CPU 42 is a CPU that controls the operation of the adapter 300, and includes a power supply voltage detection unit 22 and a communication unit 21.
The power supply voltage detection unit 22 detects the voltage value of the voltage V _dd supplied from the DC / DC converter 4 as described with reference to FIG. 1, and outputs the detected result to the communication unit 21.
The communication unit 21 transmits and receives a communication signal for controlling the operation of the interchangeable lens 210 to and from the body CPU 5 of the camera body 100 via the connection unit 301 and the connection unit 101. The communication unit 21 transmits / receives the transmitted / received communication signal to / from the lens CPU 20 of the interchangeable lens 210 via the connection unit 302 and the connection unit 211. The lens CPU 20 outputs a control signal to the AF drive circuit 23 based on the transmitted / received communication signal. Further, the communication unit 21 performs switching of the communication protocol or conversion of the communication protocol based on the voltage V _dd supplied from the DC / DC converter 4 detected by the power supply voltage detection unit 22.

The level shift unit 18 is connected between signals of the communication unit 21 and the connection unit 301 of the adapter CPU 42, and the signal level of the communication signal output from the communication unit 21 is changed to a voltage V supplied from the DC / DC converter 4. _The level is changed in accordance with _dd and output to the connection terminal c38 of the connection unit 301. Further, the level shift unit 18 changes the signal level of the communication signal input from the connection terminals d39 and e40 of the connection unit 301 in accordance with the voltage V _cc output from the power supply voltage change unit 19, thereby changing the communication unit 21. To enter. The voltage V _cc is also a voltage at which the lens CPU 20 of the interchangeable lens 210 operates. Therefore, the communication unit 21 can transmit and receive communication signals to and from the lens CPU 20 at a signal level corresponding to the voltage _Vcc .

Next, in the second embodiment, the adapter 300 determines the level of a communication signal transmitted and received between the camera body 100 and the interchangeable lens 210 and the voltage V _cc at which the interchangeable lens 210 operates from the camera body 100. The operation to be changed based on the supplied power supply voltage will be described. As an example, for the interchangeable lens 210 that operates at a voltage V _cc = 3.3 V (A system), the operation is performed at a voltage V _dd = 5.0 V (B system) and a voltage V _dd = 3.3 V (A system). A case will be described in which two types of camera bodies 100 are relayed and connected by an adapter 300 corresponding to the interchangeable lens of the A system. Here, the A system is an interchangeable lens camera system that operates at a voltage of 3.3V, and the B system is an interchangeable lens camera system that operates at a voltage of 5.0V.
In the operation of the adapter 300, the description corresponding to the operation of the interchangeable lens 200 in the first embodiment will be omitted as appropriate.

The connection part 301 of the adapter 300 is connected to the connection part 101 of the camera body 100, and supply of power supply voltage and transmission / reception of communication signals are performed via connection terminals between the connection part 301 and the connection part 101. The voltage V _dd supplied from the DC / DC converter 4 of the camera body 100 is input to the power supply voltage changing unit 19 via the connection terminal b7 of the connection unit 101 and the connection terminal b37 of the connection unit 301. The power supply voltage changing unit 19 uses the input voltage V _dd = 3.3 V (for the A system) or the voltage V _dd = 5.0 V (for the B system) as the voltage V at which the lens CPU 20 of the interchangeable lens 210 operates. Change to a voltage of _cc = 3.3V and output.
An example of the circuit of the power supply voltage changing unit 19 has the contents shown in FIG. 2, and the operation of inputting the voltage V _dd of the power supply voltage changing unit 19 and outputting the voltage V _cc is the same as in the first embodiment. Description is omitted.

Next, the level shifter 18 changes the signal level based on the voltage V _dd and the voltage V _cc , respectively. That is, the level shift unit 18 changes the signal level of the communication signal output from the adapter CPU 42 at the signal level of the voltage V _cc = 3.3V according to the power supply system of the camera body 100 to the voltage V _dd = 3.3V (A (In the case of a system) or a signal level of a voltage V _dd = 5.0 V (in the case of a B system) The changed communication signal is output to the body CPU 5 via the connection unit 301 and the connection unit 101. The level shift unit 18 is output from the body CPU 5 at a signal level of voltage V _dd = 3.3 V (in the case of A system) or voltage V _dd = 5.0 V (in the case of B system), and is connected to the connection unit 101. The signal level of the communication signal input via the unit 201 is changed to the signal level of the voltage V _cc = 3.3 V and input to the adapter CPU 42.

The voltage V _cc = 3.3 V output from the power supply voltage changing unit 19 is supplied to the interchangeable lens 210 via the connection unit 302 and the connection unit 211. A communication signal transmitted and received between the adapter CPU 42 and the body CPU 5 is transmitted between the communication unit 21 of the adapter CPU 42 and the lens CPU 20 via the connection unit 302 and the connection unit 211, and the voltage V _cc = 3. A communication signal having a signal level of 3 V is transmitted and received.

Therefore, when the interchangeable lens 210 of the A system and the camera body 100 of the B system are connected via the adapter 300, the power supply voltage changing unit 19 of the adapter 300 changes the voltage V _dd = 5.0 V to the voltage V _cc = 3. The level shift unit 18 changes the signal level of the communication signal based on the voltage V _dd = 5.0 V and the voltage V _cc = 3.3 V, respectively. As described above, when the interchangeable lens 200 and the camera body 100 of different power supply systems are connected via the adapter 300, the power supply voltage and the signal level of the communication signal are appropriately changed by the adapter 300.

When the interchangeable lens 210 of the A system and the camera body 100 of the A system having the same power supply voltage are connected via the adapter 300, the power supply voltage changing unit 19 of the adapter 300 changes the voltage V _dd = 3.3V to the voltage V _The signal is output as _cc = 3.3V, and the level shifter 18 _sets the signal level of the communication signal to the signal level of voltage V _dd = voltage V _cc = 3.3V. As described above, when the interchangeable lens 200 and the camera body 100 of the same power supply system are connected via the adapter 300, the power supply voltage and the signal level of the communication signal are appropriately changed by the adapter 300.

  Here, the interchangeable lens 210 is an example of a lens that has no power source for driving the aperture unit 29 and includes an aperture lever 33 for operating the aperture unit 29. As shown in FIG. 4, the camera body 110 includes an aperture lever driving arm 32 and an aperture lever driving means 31 for driving the aperture lever 33 when the interchangeable lens 210 is connected. The diaphragm lever driving means 31 operates the diaphragm lever driving arm 32 in accordance with the driving amount of the diaphragm lever 33 based on the number of diaphragm stages output from the body CPU 5 of the camera body 110.

  However, as shown in FIG. 5, the camera body 100 may not include the diaphragm lever driving arm 32 and the diaphragm lever driving means 31 for driving the diaphragm lever 33 in some cases. In such a case, when the camera body 100 is connected to the interchangeable lens 210, as shown in FIG. 5, the camera body 100 is connected via the adapter 300 including the aperture lever driving arm 32 and the aperture lever driving means 31. The camera body 100 can drive the aperture unit 29 of the interchangeable lens 210. That is, the adapter CPU 42 outputs the drive amount of the aperture lever driving means 31 based on the aperture stage number of the aperture control signal input through communication from the body CPU 5 of the camera body 100, and drives the aperture lever driving means 31 to stop the aperture. The lever drive arm 32 can be operated.

  5 illustrates the interchangeable lens 210 having no power source for driving the diaphragm unit 29 as described above. However, the second embodiment is not limited to this, and a power source for driving the diaphragm unit 29 is used. The interchangeable lens 210 provided may be used.

  Next, a description will be given of a case where the adapter 300 switches communication protocols and relays communication signals between the camera body 100 and the interchangeable lens 210 when the communication protocols are different between the A system and the B system. The operation of switching the communication protocol of the communication signal transmitted and received between the camera body 100 and the adapter 300 corresponds to the operation of switching the communication protocol between the camera body 100 and the interchangeable lens 200 in the first embodiment. The description is omitted.

  The difference between the second embodiment and the first embodiment is that the interchangeable lens 210 and the adapter 300 communicate with each other according to a communication protocol determined in accordance with the power supply system (in this embodiment, the communication protocol of the A system). That is. Therefore, when the camera body 100 is a power supply system different from the interchangeable lens 210 (in this embodiment, the communication protocol of the B system), the communication unit 21 of the adapter CPU 42 determines the communication protocol of the A system and the communication protocol of the B system. Perform protocol conversion between For example, the communication unit 21 extracts a protocol from communication data input using the communication protocol of the A system, and then performs a protocol conversion that performs protocol conversion such that the extracted data is output using the communication protocol of the B system. It has.

FIG. 6 shows the switching of the communication protocol and the communication protocol after the adapter 300 connected to the interchangeable lens 210 of the A system (voltage V _cc = 3.3 V) is connected and the camera body 100 is turned on by the user. It is the flowchart which showed the operation | movement which performs this conversion.
First, the voltage V _dd is input from the camera body 100 to the power supply voltage changing unit 19 (step S21). Next, based on the voltage V _dd supplied from the camera body 100, the power supply voltage changing unit 19 supplies the voltage V _cc in the adapter 300 (step S22). Subsequently, the power supply voltage detection unit 22 inputs the voltage value of the voltage V _dd into the A / D conversion port and digitally converts it (step S23).

Here, the communication unit 21 determines whether or not the voltage value of the voltage V _dd input from the power supply voltage detection unit 22 is equal to or lower than the power supply voltage of the interchangeable lens 210 of the A system (step S24). If the determination result in step S24 is YES, the communication unit 21 switches the communication protocol for communicating with the camera body 100 to the communication protocol for the A system. That is, when the voltage V _dd is the power supply voltage of the same A system that is equal to or lower than the power supply voltage of the A system, the communication unit 21 switches the communication protocol for communication with the camera body 100 to the communication protocol of the A system (step S25). ). Subsequently, in order to communicate with the interchangeable lens 210 using the communication protocol of the A system, the communication unit 21 invalidates the protocol conversion between the communication protocol of the A system and the communication protocol of the B system ( Step S27).

If the determination result in step S24 is NO, the communication unit 21 switches to the B system communication protocol. That is, when the voltage V _dd is the power supply voltage of the B system that is higher than the power supply voltage of the A system, the communication unit 21 switches to the communication protocol of the B system (step S26). Subsequently, in order to communicate with the interchangeable lens 210 using the communication protocol of the A system, protocol conversion between the communication protocol of the A system and the communication protocol of the B system is validated (step S28).

  Next, the communication unit 21 starts communication with the camera body 100 using the communication protocol of the A system or the communication protocol of the B system switched in step S25 or step S26, and is selected in step S27 or step S28. Based on whether the protocol conversion is valid or invalid, communication with the interchangeable lens 210 is started using the communication protocol of the A system (step S29).

  As described above, in the second embodiment, the adapter 300 changes the power supply voltage, changes the signal level of the communication signal, and switches and converts the protocol of the communication signal. Therefore, even if the interchangeable lens 210 does not have the function of the present invention other than the interchangeable lens 200 of the first embodiment, the camera body 100 and the interchangeable lens 210 that operate at different power supply voltages are connected via the adapter 300. By doing so, it is possible to operate appropriately.

Moreover, when connecting via the adapter 300 of this invention, it is not necessary to mount the function of this invention in the some interchangeable lens 210, respectively. Therefore, when the user owns and uses the plurality of interchangeable lenses 210, the user can reduce the cost of the entire lens interchangeable camera system. Furthermore, by designing the adapter 300 based on the mount shape of various interchangeable lens type camera systems, it is possible to apply the present invention by combining various interchangeable lenses 210 and the camera body 100.
Further, even the interchangeable lens 210 having an aperture mechanism that operates the aperture lever by external power is provided with means for driving the aperture lever by being connected via an adapter 300 having means for driving the aperture lever. Appropriate operation is possible even for a camera body 100 that is not.

  In the second embodiment, the adapter 300 is described as an example of a mount adapter. However, the adapter 300 is a teleconverter used by being connected between the interchangeable lens 210 and the camera body 100, or an intermediate ring for close-up photography. Etc. Further, the camera body 100 connected to the adapter 300 shown in FIG. 5 in the second embodiment may be the camera body 110 shown in FIG.

In the power supply voltage changing unit 19 shown in FIGS. 1 and 5 in the present invention, a circuit for boosting the voltage may be used instead of the circuit for stepping down the voltage. In the case where a circuit for boosting the voltage is used, even in a camera system where the voltage V _dd <the voltage V _cc , the connection can be appropriately performed.
Further, the power supply voltage changing unit 19 shown in FIGS. 1 and 5 in the present invention may include a circuit for boosting the voltage in addition to the circuit for stepping down the voltage. Accordingly, the power supply voltage changing unit 19 switches and outputs a circuit that outputs the input voltage at the input voltage, a circuit that outputs the voltage by reducing the voltage, or a circuit that outputs the voltage by increasing the voltage. It is also possible to do. Further, in this case, the communication unit 21 has three types of communication protocols corresponding to the three types of camera systems of voltage V _dd = voltage V _cc, voltage V _dd > voltage V _cc, or voltage V _dd <voltage V _cc. Switching or communication protocol conversion may be executed. As a result, the three types of camera systems of voltage V _dd = voltage V _cc, voltage V _dd > voltage V _cc, or voltage V _dd <voltage V _cc can be connected and appropriately operated.

  In addition, each unit of the communication unit 21 and the power supply voltage detection unit 22 in FIGS. 1 and 5 may be executed by dedicated hardware, and a computer-readable recording medium that realizes the function of each unit The above-described processing of each unit may be performed by recording the program on the recording medium, causing the computer system to read and execute the program. 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, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. 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 design and the like within a scope not departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Camera body, 200 ... Interchangeable lens, 300 ... Adapter, 101, 111, 201, 211, 301, 302 ... Connection part, 18 ... Level shift part, 19 ... Power supply Voltage changing unit, 21 ... communication unit, 22 ... power supply voltage detecting unit

Claims (7)

A camera accessory that is detachable from the camera body,
A power supply voltage supplied from the camera body, a power supply voltage changing unit for changing the voltage based on the supplied power supply voltage;
A communication unit which is supplied with a power supply voltage from the power supply voltage changing unit and executes predetermined communication;
Based on the power supply voltage supplied from the power supply voltage changing unit, the level of a communication signal transmitted from the camera body to the camera accessory is changed, and based on the power supply voltage supplied from the camera body, the camera A level shift unit for changing the level of the communication signal transmitted from the accessory to the camera body;
A camera accessory comprising:   The power supply voltage changing unit supplies the voltage of the supplied power supply voltage to the communication unit when the power supply voltage supplied from the camera body is a first voltage that is a power supply voltage for operating the communication unit. 2. The camera accessory according to claim 1, wherein when the second voltage is higher than the first voltage, the voltage is stepped down to be the first voltage and is supplied to the communication unit. . A power supply voltage detection unit for detecting a voltage value of a power supply voltage supplied from the camera body;
The said communication part switches the communication protocol of the said communication signal transmitted / received between the said camera accessory and the said camera body based on the voltage value which the said power supply voltage detection part detected. The camera accessories listed.   The communication unit selects the communication protocol corresponding to the first power supply voltage and the communication protocol corresponding to the second power supply voltage based on a voltage value detected by the power supply voltage detection unit. The camera accessory according to claim 3, wherein the camera accessory is switched.   The camera accessory according to any one of claims 1 to 4, wherein the camera accessory is an interchangeable lens. The camera accessory according to any one of claims 1 to 4, wherein the camera accessory is an adapter installed between the camera body and an interchangeable lens,
A first connection for connecting to the camera body;
A second connection for connecting to the interchangeable lens;
With
An adapter, wherein the power supply voltage output from the power supply voltage changing unit is supplied to the interchangeable lens through the second connection unit, and the communication signal is transmitted to and received from the interchangeable lens. A power supply voltage detection unit for detecting a voltage value of a power supply voltage supplied from the camera body;
The communication unit included in the adapter is
Based on the voltage value detected by the power supply voltage detection unit, switching the communication protocol of the communication signal transmitted and received between the adapter and the camera body,
Based on the voltage value detected by the power supply voltage detection unit, the communication protocol of the communication signal transmitted and received between the adapter and the camera body is switched, and the switched communication protocol is the switch of the interchangeable lens. The adapter according to claim 6, wherein, when different from a communication protocol, a protocol between the communication protocol of the interchangeable lens and the switched communication protocol is converted.

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