JP2000075386A - Lens interchangeable type camera system and interchangeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera system and an interchangeable lens constituted so that the malfunctions thereof are prevented from occurring and the waste of a battery is eliminated by properly displaying a state related on the capacity of the battery with respect to the operator of the camera. SOLUTION: The interchangeable lens is provided with a first storage means 317 storing a value related on check voltage guaranteeing the action of the interchangeable lens and a lens control means 319. A camera main body is provided with a second storage means 225 storing a value related on check voltage guaranteeing the action of the camera main body, a voltage detection means 226 and a camera control means 239. By the control means 319, the value related on the check voltage of the storage means 317 is transmitted to the camera main body 200. By the control means 239, a voltage value detected by the detection means 226, the value related on the voltage of the storage means 317 and received from the interchangeable lens and the value related on the voltage of the storage means 225 are compared so that the state related on the capacity of the battery is displayed based on the compared result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interchangeable lens type camera system which can prevent malfunction of a camera and an interchangeable lens and prevent wasteful replacement of a battery.

[0002]

2. Description of the Related Art Generally, in a camera having an electric drive mechanism and a microcomputer for control, a dry battery or a lithium battery pack is used as a power source, and it is detected whether or not the capacity of the power source is sufficient. A battery check device is provided to indicate the situation. Conventionally, in this type of device, it is necessary to detect a power supply voltage by connecting a load to the battery in order to take into account the internal resistance of the battery in order to detect whether the capacity of the power supply is sufficient. Was. As a method of this load, for example, there is a technique disclosed in Japanese Patent Application Laid-Open No. 61-249033. Japanese Patent Application Laid-Open No. 61-249033 discloses a film winding or shutter for a camera,
It has been proposed to detect the power supply voltage by energizing a motor used for charging the aperture as a load for detecting the power supply voltage.

Further, the battery check device stores a power supply check voltage value for ensuring that all electric drive mechanisms and a control microcomputer provided in the camera body can function normally. The power supply voltage values thus obtained are compared with each other, and the situation regarding the power supply capacity is indicated to the camera operator.

[0004]

In the interchangeable lens type camera, functions such as automatic focus adjustment (AF), power zoom, and camera shake prevention have been developed, and a motor for driving electrically and an electromagnetic magnet are provided on the interchangeable lens side. As a result, when the power consumption of the interchangeable lens is neglected, a malfunction occurs when the battery capacity decreases. For this reason, the battery check device stores an electric drive device and a microcomputer for control provided on the camera body side and a power supply check voltage value that can guarantee the function including the electric drive device on the interchangeable lens side. Was. In determining the power supply check voltage value, the malfunction of the camera can be prevented by taking into account the interchangeable lens of the maximum power consumption (maximum load) expected to be attached to the camera body.

However, in this battery check device, it is necessary to consider various types of electric drive devices that are expected to be equipped on the interchangeable lens in the future. This makes it impossible to properly indicate the situation regarding the capacity of the battery to the user, and there is a problem that the time to replace the battery is hastened.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a camera operator and a camera with an interchangeable lens by appropriately showing a battery capacity to a camera operator. It is an object of the present invention to provide an interchangeable lens camera system and an interchangeable lens that can be used effectively while preventing occurrence of malfunction and eliminating waste of battery.

[0007]

In order to achieve the above-mentioned object, the interchangeable lens type camera system according to the first aspect of the present invention comprises:
As shown in FIG. 1, an interchangeable lens 300, a camera body 200 having a plurality of electrical contacts 305 between the lens and the camera, communicating various information through the electrical contacts 305, and supplying power from the camera to the lens. In the camera system comprising: a first storage means 317 for storing on the interchangeable lens side a value VL relating to a check voltage for ensuring that all functions of the interchangeable lens 300 operate normally; and a lens control means 319 for controlling the lens. A second storage means 225 for storing a value VB relating to a check voltage on the camera body side for ensuring that all functions of the camera body 200 operate normally, a voltage detection means 226 for detecting a power supply voltage, and controlling the camera. A lens control unit 319 for checking the first storage unit 317. The camera control unit 239 transmits a voltage value detected by the voltage detection unit 226, a value VL received from the interchangeable lens 300, and a value VL related to the voltage of the first storage unit 317. Is compared with a value VB relating to the voltage of the second storage means 225, and the situation regarding the battery capacity is appropriately indicated to the operator of the camera based on the comparison result.

Further, the interchangeable lens of the second invention of the present application is shown in FIG.
As shown in the interchangeable lens 300, a first storage means 317 for storing a value relating to a check voltage for ensuring that all functions of the interchangeable lens operate normally, and a camera body 20.
0 terminals SCK, SI, SO provided for communication with
A terminal MP receiving power supply from the camera body 200,
PGND, and the first electrical contact 305;
The camera is provided with lens control means 319 for transmitting a value relating to the check voltage of the storage means 317 to the camera body 200.

Further, as shown in FIG. 1, the interchangeable lens camera system according to the third aspect of the present invention has an interchangeable interchangeable lens 300 and a plurality of electrical contacts 305 between the lens and the camera. In a camera system including a camera body 200 that communicates various information and supplies power to the lens from the camera, a value VL relating to a check voltage that guarantees that all functions of the interchangeable lens 300 operate normally on the interchangeable lens side is stored. First storage means 3
17 and a lens control means 319 for controlling the lens, and a value VB relating to a check voltage for ensuring that all functions of the camera body 200 operate normally on the camera body side.
225, a voltage detection means 226 for detecting a power supply voltage, and a camera control means 239 for controlling a camera. The lens control means 319 Upon receiving the detected voltage value, the value VL relating to the check voltage in the first storage means 317 is compared with the detected voltage value, the comparison result is transmitted to the camera body 200, and the camera control means 239 is received.
Transmits the detected voltage value detected by the voltage detecting means 226 to the interchangeable lens 300, receives the comparison result from the interchangeable lens 300, and outputs a value VB relating to the voltage of the second storage means 225 and the detected voltage of the voltage detecting means. This is characterized in that the values are compared with each other, and based on the comparison result and the comparison result received from the interchangeable lens 300, the situation regarding the battery capacity is appropriately indicated to the operator of the camera.

The interchangeable lens according to the fourth invention of the present application is shown in FIG.
As shown in the interchangeable lens 300, a first storage means 317 for storing a value relating to a check voltage for ensuring that all functions of the interchangeable lens operate normally, and a camera body 20.
0 terminals SCK, SI, SO provided for communication with
A terminal MP receiving power supply from the camera body 200,
Receiving the detected voltage value of the voltage detecting means 226 from the camera body 200 and the electrical contact 305 composed of PGND, and comparing the detected voltage value with the value VL relating to the check voltage of the first storage means 317; A lens control unit 319 for transmitting a comparison result to the camera body 200 is provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the interchangeable-lens camera system of the first invention of the present application, a value VL relating to a check voltage that guarantees that all functions of the interchangeable lens 300 operate normally on the interchangeable lens side is stored in the first storage unit 317.
A plurality of electrical contacts 305 are provided between the lens and the camera, and power is supplied from the camera to the lens through the electrical contacts 305. Further, communication of various kinds of information including information of the first storage unit 317 is performed by the lens control unit 319 through this contact point. The second storage means 225 stores the value VB relating to the check voltage for ensuring that all functions of the camera body 200 operate normally on the camera body side.
I remember. Camera control means 23 for controlling the camera
Reference numeral 9 denotes a voltage value detected by the voltage detection unit 226, a value VL relating to a voltage of the first storage unit 317 obtained by communication from an interchangeable lens, and the second storage unit 22 of the camera body.
5 is compared with the value VB relating to the voltage of No. 5. Then, based on the result of this comparison, the situation regarding the battery capacity is appropriately shown to the camera operator.

The interchangeable lens according to the second aspect of the present invention is an interchangeable lens mounted on the camera body 200 described in the first embodiment of the present invention. The first storage means 317 stores a value relating to a check voltage for ensuring that the function operates normally. An electric contact 305 is provided which includes terminals SCK, SI, and SO provided for communication with the camera body 200 and terminals MP and PGND that receive power supply from the camera body 200. Further, a control unit 319 for transmitting a value VL relating to the check voltage of the first storage unit 317 to the camera body 200 is provided.

Next, an embodiment of the interchangeable lens type camera system according to the third aspect of the present invention will be described in comparison with the first aspect of the present invention. The first invention and the third invention of the present application are that the value VL relating to the check voltage which guarantees that all functions of the interchangeable lens 300 operate normally on the interchangeable lens side is stored in the first storage means 317, and that the camera body side has a camera. The value VB relating to the check voltage which guarantees that all the functions of the main body 200 operate normally is stored in the second storage means 225, and the voltage detection means 2
26 is the same. However, the first invention of the present application has a value VL relating to the check voltage of the first storage means 317.
Is transmitted to the camera body 200, and the value VL relating to the check voltage received on the camera body side is compared with the detected voltage. On the other hand, in the third invention of the present application, the detected voltage value detected by the voltage detecting means 226 of the camera body 200 Is transmitted to the interchangeable lens 300, the value VL relating to the check voltage stored in the first storage means 317 is compared with the received detection voltage value on the interchangeable lens side, and the comparison result is transmitted to the camera body. That is, it can be said that the difference lies in the lens control unit 319 and the camera control unit 239.

Here, the control of the third invention of the present application will be clarified. The lens control unit 319 receives the detection voltage value of the voltage detection unit 226 from the camera body 200, compares the value VL regarding the check voltage in the first storage unit 317 with the detection voltage value, and transmits the comparison result to the camera body 200. I do. The camera control unit 239 transmits the detected voltage value detected by the voltage detection unit 226 to the interchangeable lens 300, and
00, the value VB relating to the voltage of the second storage means 225 is compared with the detected voltage value of the voltage detection means 226, and the operator of the camera is operated based on the comparison result and the comparison result received from the interchangeable lens. FIG. 2 appropriately shows the situation regarding the capacity of the battery.

The interchangeable lens according to the fourth aspect of the present invention is an interchangeable lens mounted on the camera body 200 described in the third embodiment of the present invention. The first storage means 317 stores a value relating to a check voltage for ensuring that the function operates normally. An electric contact 305 is provided which includes terminals SCK, SI, and SO provided for communication with the camera body 200 and terminals MP and PGND that receive power supply from the camera body 200. Then, the lens control unit 319 receives the detection voltage value of the voltage detection unit 226 from the camera body 200, compares the value VL regarding the check voltage in the first storage unit 317 with the detection voltage value, and transmits the comparison result to the camera body. It is provided with.

As described above, according to the present invention, the check voltage value VB for guaranteeing that all functions of the camera body operate normally and the check voltage value VL for guaranteeing that all functions of the interchangeable lens operate normally. , The detected voltage values of the batteries are compared with each other, so that the status of the battery capacity can be appropriately shown to the camera operator, thereby preventing the malfunction of the camera and the interchangeable lens and the unnecessary replacement of the batteries. Can be.

[0017]

The first embodiment of the present invention will be described below. FIG. 2 is a block diagram in which the interchangeable lens camera system is applied to a single-lens reflex camera. In FIG. 2, an interchangeable lens 300 is a lens barrel that is interchangeably mounted on the camera body 200 and has a plurality of electrical contacts 305 for communicating various information between the lens and the camera and supplying power from the camera to the lens. I have. Reference numerals 301 to 304 denote lens groups. The first lens group 301 can adjust the focus position on the film surface by moving back and forth on the optical axis. The second group lens 302 can change the focal length of the photographing lens by moving back and forth on the optical axis, thereby changing the photographing magnification. The third lens group 303 acts to correct the focal point movement caused by the movement of the second lens group 302. The third lens group 303 is configured to move forward and backward in conjunction with a mechanical cam barrel (not shown) by changing the magnification of the second lens group 302. Reference numeral 304 denotes a fourth group lens.

Reference numeral 306 denotes a focus motor driving circuit, which is driven by the focus driving motor
01 is moved back and forth to automatically adjust the focus. 30
An aperture motor drive circuit 9 drives the aperture motor 310 in a stepwise manner to adjust the aperture of the taking lens to a predetermined aperture.

Here, the plurality of electrical contacts 305 provided on the lens mount will be described. The contact L0 is connected to the focus motor drive circuit 306 and the aperture motor drive circuit 309 on the lens side, and supplies power for driving the motor. The contact L1 is a ground for a motor power supply. The contact L2 is connected to the lens microcomputer 320 to supply power. The contacts L3, L4, and L5 perform known serial communication between the lens and the camera. There are a clock contact L3 for transmitting a communication synchronization signal from the camera to the lens, a contact L4 for transmitting various commands from the camera to the lens, and a contact L5 for transmitting various lens information from the lens to the camera. Contact L6
Is a ground for the power supply of the lens microcomputer 320.

The lens microcomputer 320 is connected to the camera microcomputer 240 via a plurality of electrical contacts 305, and outputs a control signal to a focus motor drive circuit 306 upon receiving an automatic focus adjustment operation command from the camera. 307 is operated, and the first-group lens 301 is moved back and forth to automatically perform focus adjustment. At this time, the movement amount of the first group lens 301 is sent as a pulse signal to the lens microcomputer 320 by the photo interrupter 308 and monitored. When the lens microcomputer 320 reaches the command position of the camera, the focus microcomputer 307
Is controlled to be stopped. On the other hand, when an aperture stop command is received from the camera, a control signal is output to the aperture motor drive circuit 309, the aperture motor 310 is driven stepwise, and the aperture of the taking lens is adjusted to a predetermined aperture.

The lens microcomputer 320 is connected to a 4-bit encoder ZENC linked to the movement of the second lens group 302 by the zooming operation, and inputs zoom position information obtained by dividing the focal length from wide to tele into 16 parts. You.
The ROM built into the lens microcomputer 320 has 1
There is a lens-specific information storage unit 318 that stores various lens-specific information, for example, an open aperture value, an actual focal length, a feeding-out amount conversion coefficient, and the like, corresponding to the six-divided zoom positions.
Further, the ROM includes a check voltage VL storage circuit 317 that stores a check voltage value VL that guarantees that all functions of the interchangeable lens 300 operate normally. When the lens microcomputer 320 receives a transmission request command for various kinds of unique information of the lens from the camera microcomputer 240, the lens microcomputer 320 sends unique information corresponding to the current zoom position to the camera. Further, upon receiving a transmission request command for a value relating to the check voltage, the corresponding information is transmitted to the camera. A method of setting a value to be stored in the check voltage VL storage circuit 317 will be described later.

The camera body 200 has a main mirror 201 so as to be set obliquely in the optical path or to retreat depending on the viewfinder observation state and the photographing state. The main mirror is translucent, and in the finder observation state, almost half of the light flux from the subject is guided to the focus plate 203, and the photographing screen can be observed by the pentaprism 204 and the eyepiece 205. Here, the remaining half amount of light passes through the main mirror 201 and is reflected by the sub-mirror 202,
Focus detection optical system 206 provided below mirror box
Incident on. On the other hand, in the shooting state, the main mirror 2
01 moves out of the optical path, and when the shutter 210 is opened, the luminous flux of the subject is changed to a photosensitive member 212 made of a silver halide film or the like.
To reach.

The camera microcomputer 240 includes a focus detection circuit 207, a main mirror drive circuit 209, a shutter drive circuit 211, a film drive circuit 214, a film travel detection circuit 215, a photometric circuit 217, and a switch sense circuit 2.
19. The LCD display circuit 220 is connected. Also,
The camera microcomputer 240 is connected to the lens microcomputer 320 through a plurality of electrical contacts 305, and communicates various information and issues an operation command from the camera to the lens.

The focus detection circuit 207 includes the camera microcomputer 2
According to the signal from the focus detection optical system 206,
The storage time control and readout control of the D line sensor are performed, and pixel information is output to the camera microcomputer 240. The camera microcomputer 240 performs A / D conversion of the pixel information, detects a focus shift amount by a known phase difference detection method, and transmits an automatic focus adjustment operation command to the lens microcomputer 320 to perform focus adjustment.

The main mirror drive circuit 209 controls the main mirror drive motor 208 in accordance with a signal from the camera microcomputer 240, and moves the main mirror 201 to an obliquely set or retracted position in the optical path. The main mirror drive motor 208 also performs a mechanical charge of a spring for operating the shutter 210.

The shutter drive circuit 211 controls the energization time of the front curtain magnet and the rear curtain magnet constituting the shutter 210 in accordance with a signal from the camera microcomputer 240, and adjusts the exposure time of the photosensitive member 212.

The film drive circuit 214 is operated by a film drive motor 213 according to a signal from the camera microcomputer 240.
Is controlled to wind up the photosensitive member 212 made of a silver halide film or the like. The film drive motor 213 is rotated in the reverse direction, and the film is rewound by a rewind mechanism (not shown).

The film running detection circuit 215 outputs the moving amount of the film to the camera microcomputer 240 as a pulse signal. The camera microcomputer 240 stops the film drive motor 213 when it reaches the position of one film frame. In the case of the film rewind operation, the film drive motor 213 is stopped when the stop of the transmission of the pulse signal is detected.

The photometric circuit 217 includes a camera microcomputer 240
, And controls the photometric sensor 216 to output photometric information to the camera microcomputer 240. The camera microcomputer 240 performs A / D conversion of the photometric information and calculates a shutter speed and an aperture value for exposure control.

The switch sense circuit 219 includes a switch SW that is turned on by the first stroke of a release button (not shown).
1, a switch SW2 that is turned on in the second stroke, and a setting button switch and a timing switch (not shown) are detected and output to the camera microcomputer 240. The camera microcomputer 240 starts the photometry and the AF operation when the switch SW1 is turned on, and starts the exposure operation when the switch SW2 is turned on. When the other setting button switches are turned on, the camera function is set in accordance with the button. The timing switch is used for timing adjustment in sequence control in camera operation.

The LCD display circuit 220 displays the status of the camera on the LCD 221 in the finder and the external LCD 222 according to the signal of the camera microcomputer 240.

Battery 223 provided in camera body 200
Is connected to the main mirror drive circuit 209, the shutter drive circuit 211 and the film drive circuit 214, and the film drive motor 213 and the shutter drive magnet 211a
Drive power supply. In addition, according to a control signal from the camera microcomputer 240, power is supplied from the lens motor power switch circuit 218 to the focus motor drive circuit 306 and the aperture motor drive circuit 309 via the terminal L0 of the electrical contact 305. The DC / DC converter 224 supplies stabilized power to the lens microcomputer 320 via the camera microcomputer 240 and the terminal L2 of the electrical contact 305. The battery 2
Reference numeral 23 is also connected to an analog input terminal of the camera microcomputer 240, and can detect a voltage value by performing A / D conversion.

The ROM built into the camera microcomputer 240 stores a program for controlling the camera operation and camera-specific information. The ROM also contains the camera body 2
A check voltage VB storage circuit 22 that stores a check voltage value VB that guarantees that all the functions of 00 operate normally.
There are five. The check voltage values stored in the check voltage VB storage circuit 225 of the camera microcomputer 240 and the check voltage VL storage circuit 317 of the lens microcomputer 320 are as follows:
Used for camera battery check.

Here, the battery check operation employed in this embodiment will be described. Camera microcomputer 240
Performs A / D conversion of an analog input of the battery 223 and detects a voltage value. It is necessary to apply an appropriate load to the battery before the A / D conversion. Therefore, the main mirror 201
Mirror drive motor 2 within a range that does not affect the position of
A known load operation such as performing reverse rotation at 08 is performed. Then, the check voltage VB stored in the check voltage VB storage circuit 225 is compared with the detected voltage value detected. At this time, if it is determined that the detected voltage value is lower than the check voltage value VB, a warning is issued to the camera operator.

Next, the camera microcomputer 240 is connected to the lens microcomputer 320 through the terminals L3 and L4 of the electric contact 305.
To send a command to request transmission of a value related to the check voltage.
Then, the lens microcomputer 320 transmits the check voltage value VL of the check voltage VL storage circuit 317 to the camera via the terminal L5 of the electric contact 305. Camera microcomputer 2
Reference numeral 40 compares the check voltage value VL received from the lens with the previously detected voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VL, a warning is issued to the camera operator.

A method of setting the check voltage value VB stored in the check voltage VB storage circuit 225 of the camera microcomputer 240, which constitutes the battery check, will be described. The electric drive mechanism provided in the camera body 200 includes:
A main mirror drive motor 208, a shutter drive magnet 211a, and a film drive motor 213. A power supply voltage value at which the camera can operate normally when each drive mechanism is operated is obtained by experiment or measurement.
For example, the lower limit of the main mirror drive motor 208 is 4.2V, and the shutter drive magnet 211a is 3.8V.
V is the lower limit and the film drive motor 213 is 4.0V
Is the lower limit, and malfunction may occur at a voltage value lower than this. In this case, if 4.2 V of the main mirror drive motor 208 having the highest voltage value is adopted as the battery check voltage value, it is possible to guarantee that all functions of the camera body 200 operate normally. However, the check voltage VB storage circuit 22 of the camera microcomputer 240
5 stores a value corresponding to 4.2V. Also, the main mirror drive motor 208 and the film drive motor 213
In the case of a camera specification that simultaneously drives the power supply, a power supply voltage value that can operate normally even during the simultaneous and parallel driving is obtained, and a value indicating the maximum voltage value including this value is stored in the check voltage VB storage circuit 225. Just do it.

Next, the check voltage value VL stored in the check voltage VL storage circuit 317 of the lens microcomputer 320
The setting method of will be described. The electric drive mechanism provided in the interchangeable lens 300 includes a focus drive motor 307,
Two of the aperture motors 310. A power supply voltage value at which the interchangeable lens 300 can operate normally when each of the driving mechanisms is operated is obtained by experiment or measurement. For example, the lower limit of the focus drive motor 307 is 4.1 V, and the lower limit of the aperture motor 310 is 3.8 V. A malfunction may occur at a voltage value lower than this. in this case,
If 4.1 V of the focus drive motor 307 having the maximum voltage value is adopted as the battery check voltage value, it is possible to guarantee that all functions of the interchangeable lens 300 operate normally. However, a value corresponding to 4.1 V is stored in the check voltage VL storage circuit 317 of the lens microcomputer 320. Further, if the lens specification is such that the focus drive motor 307 and the aperture motor 310 are simultaneously driven,
A power supply voltage value that can operate normally even during simultaneous and parallel driving may be obtained, and a value indicating the maximum voltage value including this value may be stored in the check voltage VL storage circuit 317.

FIG. 3 shows a lens barrel interchangeably mounted on the camera body 200 of the single-lens reflex camera shown in FIG. This interchangeable lens 350 is obtained by adding an electric zoom mechanism to the interchangeable lens 300 of FIG. 1, and portions having the same configuration are denoted by the same reference numerals and description thereof is omitted. Here, only the additional parts will be described. Reference numeral 311 denotes a zoom motor driving circuit, which rotates a mechanical cam barrel (not shown) by the zoom motor 312 to move the second group lens 302 and the third group lens 303 back and forth, thereby changing the focal length of the photographing lens. The photographing magnification can be changed. Switches ZW and ZT for instructing the rotation direction of the electric zoom are connected to the lens microcomputer 320. Upon detecting that the switch ZW is ON, the lens microcomputer 320 drives the zoom motor 312 in the wide direction, and
When T ON is detected, it is driven in the telephoto direction.

Next, a method of setting the check voltage value VL stored in the check voltage VL storage circuit 317 of the lens microcomputer 320 in FIG. 3 will be described. Interchangeable lens 350
The electric drive mechanism provided in the focus drive motor 3
07, an aperture motor 310, and a zoom motor 312. A power supply voltage value at which the interchangeable lens 350 can operate normally when each of the driving mechanisms is operated is obtained by experiment or measurement. For example, the lower limit of the focus drive motor 307 is 4.1 V, the lower limit of the aperture motor 310 is 3.8 V, and the lower limit of the zoom motor 312 is 4.5 V. A malfunction occurs at a voltage value lower than this. There was fear. In this case, the zoom motor 31 having the highest voltage value
If 4.5V of 2 is adopted as the battery check voltage value, it is possible to guarantee that all the functions of the interchangeable lens 350 operate normally. However, a value corresponding to 4.5 V is stored in the check voltage VL storage circuit 317 of the lens microcomputer 320.

FIG. 4 shows an LC used for battery check.
FIG. 3D is an explanatory diagram of display, which is displayed on the external LCD 222 of FIG. 2. In FIG. 4, the indication a indicates a state where the battery has a sufficient capacity. The display of “b” indicates a state in which the capacity of the battery is low. On the other hand, the display of c warns that the battery capacity is insufficient and it is time to replace the battery. This warning, as described in the battery check operation above, means that the detected voltage value of the battery is lower than the check voltage value that guarantees that all functions of the camera and the interchangeable lens operate normally. For this reason, it is desirable that the camera microcomputer 240 performs control to prohibit the photographing operation of the camera at the same time when the warning display of the battery replacement time is performed.

Next, the operation flow of the camera system with interchangeable lenses will be described with reference to FIGS. 5, 6 and 7. FIG.
4 shows a flowchart of lens control performed by a lens control circuit 319 of the lens microcomputer 320. First, in step (hereinafter abbreviated as #) 501, initial settings such as clearing of a built-in RAM of the lens microcomputer 320 and initial data setting, input / output setting of each port, communication mode setting with the camera microcomputer 240, and the like are performed. In # 502,
It waits for various operation commands transmitted from the camera microcomputer 240. Thereafter, the process proceeds to the next when the reception is completed.

In step # 503, if the operation command from the camera is a command for requesting transmission of various kinds of unique information of the lens, the process proceeds to step # 504, where the unique information corresponding to the current zoom position is read from the lens unique information storage unit 318, Microcomputer 24
0 and returns to # 502.

In step # 505, if the operation command from the camera is a check voltage transmission request command, the flow advances to step # 506, and the check voltage VL is read from the check voltage VL storage circuit 317.
Is read out and transmitted to the camera microcomputer 240, and # 502
Return to

In step # 507, if the operation command from the camera is a stop-down command, the process proceeds to step # 508, where a control signal is output to the stop motor drive circuit 309, and the stop motor 310 is step-driven to set the stop of the photographing lens to a predetermined value. And returns to # 502.

In step # 509, if the operation command from the camera is an aperture opening command, the process proceeds to step # 510, where a control signal is output to the aperture motor drive circuit 309, the aperture motor 310 is step-driven, and the aperture of the photographing lens is adjusted. Open position #
Return to 502.

In step # 511, if the operation command from the camera is a standby command, the process proceeds to step # 512, where the lens microcomputer 320 is set to the low power consumption mode, and waits until communication from the camera is resumed. Thereafter, when the transmission of the operation command from the camera is restarted, the process exits the standby state and returns to step # 502.

At step # 513, it is determined whether or not the operation command from the camera is an automatic focus adjustment operation (AF operation) command.
Here, if not applicable, it is an operation command that is not accepted by the lens microcomputer 320, and the process returns to # 502 and waits for completion of reception of the operation command again.

On the other hand, if applicable, proceed to # 514,
A control signal is output to the focus motor drive circuit 306,
The focus drive motor 307 is operated, and the first group lens 3
01 is moved back and forth to automatically adjust the focus. # 5
In step 15, the amount of movement of the first lens group 301 is counted by counting pulse signals output from the photointerrupter 308,
Loop # 515 until the camera reaches the command position. When reaching the command position, the process exits the loop, and in # 516, controls to stop the focus drive motor 307 and returns to # 502.

FIG. 6 shows a flow chart of camera control performed by the camera control circuit 239 of the camera microcomputer 240. First, in # 401, the camera microcomputer 2
Initial settings such as clearing of the built-in RAM 40 and initial data set, input / output setting of each port, communication mode setting with the lens microcomputer 320, and the like are performed. At step # 402, a standby command is transmitted to the lens microcomputer 320 to set the lens microcomputer 320 to the low power consumption mode. Subsequently, the camera microcomputer 240 is set to the low power consumption mode, and waits until the release button is operated. Then, the switch SW1 is turned on by the first stroke of the release button.
To exit the standby state, and perform a battery check in # 403. Details of the battery check will be described later.

In step # 404, it is determined whether or not the switch SW1 has been turned on by the first stroke of the release button.
If ON, proceed to # 407; if OFF, # 405
Proceed to. In step # 407, a command to request transmission of the unique information of the lens is transmitted to the lens microcomputer 320, and the unique information is received.

Next, the photometric information output from the photometric circuit 217 is subjected to A / D conversion to obtain a subject brightness value BV. Then, an appropriate exposure EV = SV + BV is calculated from the film sensitivity SV and the subject brightness BV. Subsequently, the proper exposure EV
The shutter speed and aperture value are determined according to the exposure mode.

Next, at step # 408, the pixel information output from the focus detection circuit 207 is A / D converted, and the amount of defocus is detected by a known phase difference detection method. In step # 409, an automatic focus adjustment operation (AF operation) command is transmitted to the lens microcomputer 320 to perform focus adjustment.

At step # 410, it is determined whether or not the switch SW2 is turned on by the second stroke of the release button.
If ON, proceed to # 411; if OFF, proceed to # 404
After that, the process loops from # 404 to # 410. During this time, in # 404, when it is determined that the switch SW1 has been turned from ON to OFF in the first stroke, the process proceeds to # 405, and it is determined whether the 6-second timer is ON. Here, if within 6 seconds from the time when the switch SW1 is turned from ON to OFF, the process proceeds to # 406, performs the same photometry and exposure calculation as in # 407, returns to # 404, and thereafter returns to # 404 to # 4.
Loop 06. If it is determined in step # 405 that 6 seconds have elapsed, the flow returns to step # 402 and shifts to the standby state. The function of the 6-second timer is to continuously operate the photometry and the exposure calculation until 6 seconds have elapsed since the switch SW1 was turned on from the off state in the first stroke of the release button. In other words, the operation of the camera is not interrupted even if the finger is temporarily released from the release button by an operation or the like.

In step # 411, power is supplied to the front curtain magnet and the rear curtain magnet constituting the shutter 210 from the shutter drive circuit 211 to keep the shutter blades running.

Next, at # 412, a control signal is output to the main mirror drive circuit 209 to start mirror up.
Then, in step # 413, a stop-down command is transmitted to the lens microcomputer 320, and the stop-down operation is performed to the stop value determined by the exposure calculation in step # 407. In # 414, the process loops through # 414 and waits until a mirror-up completion signal is detected.
When the completion signal is detected, the process proceeds to step # 415.

In step # 415, the energization of the front curtain magnet is cut off and the front curtain is driven. Then, in step # 416, it is determined whether or not the exposure timer is ON. If the exposure timer is within the time corresponding to the shutter speed determined in the exposure calculation in step # 407, step # 416 is looped. And O of the exposure timer
After waiting for N, in # 417, the energization of the rear curtain magnet is cut off, the rear curtain is driven, and the exposure operation is completed.

After the completion of the exposure operation, an aperture opening command is transmitted to the lens microcomputer 320 at # 418, and the aperture opening operation is performed. Subsequently, in # 419, the main mirror driving circuit 2
In step 09, a control signal is output to start mirror down. #
In step 420, the process loops through step # 420 until a mirror down completion signal is detected, and in step # 421, the completion signal is detected.
Proceed to. In # 421, a control signal is output to the film drive circuit 214 to start winding. A pulse signal is output from the film running detection circuit 215 with the winding operation. In step # 422, the pulse signal is counted, and the film drive motor 213 is stopped at a position corresponding to one frame of the film to complete the winding. The operation up to this point is the camera operation for one frame photographing, and thereafter returns to step # 404 and moves to the next photographing.

FIG. 7 is a control flow chart showing the battery check operation of # 403 in FIG. First, # 4
At 30, a control signal is output to the main mirror drive circuit 209, and the main mirror drive motor 208 is driven in reverse rotation to apply a load to the battery 223. In step # 431, the process waits for 1 ms as a time for stabilizing the voltage drop of the battery. And
At # 432, the analog input of the battery 223 is A / D converted and the voltage value is detected. At step # 433, the main mirror drive motor 208 is stopped. The reverse rotation time of the main mirror drive motor 208 is set within a range that does not affect the position of the main mirror 201.

Next, in step # 434, the check voltage value VB stored in the check voltage VB storage circuit 225 is compared with the detected voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VB, a warning is issued to the operator of the camera, and the process proceeds to # 439. Otherwise, the process proceeds to the next step. In step # 435, a command to request transmission of a value related to the check voltage is transmitted to the lens microcomputer 320. And
In step # 436, the check voltage V is output from the lens microcomputer 320.
The check voltage value VL of the L storage circuit 317 is received. #
At 437, the check voltage value VL received from the lens is compared with the previously detected detection voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VL,
A warning is issued to the camera operator, and the process proceeds to # 439. Otherwise, the process proceeds to the next step. In # 438, the LCD display circuit 2
A control signal is output to the LCD 20 and the display shown in FIG. 4A is displayed on the external LCD 222 to inform the camera operator that the battery has sufficient capacity, and the process returns to the main flow.

At step # 439, a control signal is output to the LCD display circuit 220, and the display shown in FIG. 4C is displayed on the external LCD 222 to warn the camera operator that the battery capacity is insufficient and it is time to replace the battery. I do. When this warning display is performed, a standby command is transmitted to the lens microcomputer 320 at # 440 to control the camera to simultaneously inhibit the photographing operation, and the lens microcomputer 320 is set to the low power consumption mode. The camera microcomputer 240 is set to the low power consumption mode, and waits for battery replacement.

As described above, in the first embodiment of the present invention, the check voltage value VB for ensuring that all functions of the camera body operate normally and the normal operation of all functions of the interchangeable lens are guaranteed. The check voltage value VL is compared with the detected voltage value of the battery, and if it is determined that the detected voltage value is lower than the check voltage value VB or the check voltage value VL, it is necessary for the camera operator to replace the battery. Has been described, the malfunction of the camera and the interchangeable lens and the unnecessary replacement of the battery can be prevented. However, the check voltage values VB and VL are not limited to one each. Instead, by preparing multiple,
It is possible to appropriately show the situation regarding the capacity of the battery to the camera operator.

For example, as described above, the check voltage VL storage circuit 317 of the lens microcomputer 320 stores a check voltage for ensuring that all functions of the interchangeable lens operate normally, that is, a check voltage value V for determining a battery replacement warning.
L1 and two kinds of check voltage values VL2 for determining whether the battery capacity is low are stored. Similarly, the check voltage VB storage circuit 225 of the camera microcomputer 240 has
A check voltage value VB1 for determining the battery replacement warning and a check voltage value V for further determining the caution of the battery capacity decrease.
Two types of B2 are stored.

Next, a control flow chart showing a battery check operation of this configuration will be described with reference to FIG. Note that #
430 to # 433 are the same as in FIG.

At step # 450, a command to request transmission of the values VL1 and VL2 relating to the check voltage is transmitted to the lens microcomputer 320. Then, in # 451, the lens microcomputer 320
, The check voltage values VL1 and VL2 of the check voltage VL storage circuit 317 are received. (In this case, the check voltage values VL1 and VL2 are
Will need to be changed to send.) Next, in # 452,
The check voltage VB1 stored in the check voltage VB storage circuit 225 is compared with the detected voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VB1, a battery replacement warning is issued to the camera operator, and the process proceeds to step # 458. Otherwise, the process proceeds to the next step. # 45
In step 3, the check voltage value VL1 received from the lens is compared with the previously detected voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VL1,
A battery replacement warning is issued to the camera operator, and the process proceeds to step # 458. Otherwise, the process proceeds to the next step.

In step # 454, the check voltage value VB2 stored in the check voltage VB storage circuit 225 is compared with the detected voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VB2, the camera operator is warned that the battery capacity is low, and the process proceeds to step # 457. Otherwise, the process proceeds to the next step. In step # 455, the check voltage value VL2 received from the lens is compared with the previously detected voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VL2, the operator of the camera is warned of a decrease in battery capacity, and the process proceeds to # 457. Otherwise, the process proceeds to the next step. In # 456, the LCD display circuit 220
4a is displayed on the external LCD 222 to inform the camera operator that the battery capacity is sufficient, and the process returns to the main flow.

In step # 457, a control signal is output to the LCD display circuit 220, and the display shown in FIG. 4B is displayed on the external LCD 222 to notify the camera operator of the decrease in the battery capacity. That is, since the time to replace the battery is approaching, the user is notified to prepare a spare battery, and the process returns to the main flow.

In step # 458, a control signal is output to the LCD display circuit 220, and the display shown in FIG. 4C is displayed on the external LCD 222 to warn the camera operator that the battery capacity is insufficient and it is time to replace the battery. I do. When this warning is displayed, a standby command is transmitted to the lens microcomputer 320 at # 459 to control the camera to simultaneously inhibit the shooting operation of the camera, and the lens microcomputer 320 is set to the low power consumption mode. The camera microcomputer 240 is set to the low power consumption mode, and waits for battery replacement.

As described above, the check voltage values VB1 and VB2 are provided on the camera body and the check voltage values VL1 and VL2 are provided on the interchangeable lens, and the camera operator is warned that the battery capacity is low and that it is time to replace the battery. That is, it is described that if the configuration is made so that the situation regarding the capacity of the battery can be appropriately indicated. Further, if the number of stored check voltages is increased to three or four, the capacity of the battery can be displayed in, for example, a bar graph.

Next, a second embodiment of the present invention will be described. The lens interchangeable camera system of the present embodiment has the same optical configuration and circuit configuration as the first embodiment of the present invention described above, and FIG. 2 is applied. Therefore, description of the optical configuration and the circuit configuration will be omitted. Then, the first
The difference from the embodiment is a lens control circuit 319 of the lens microcomputer 320 and a camera control circuit 239 of the camera microcomputer 240. Therefore, an operation flow of each control circuit will be described.

FIG. 9 is a flowchart of lens control performed by the lens control circuit 319 of the lens microcomputer 320. First, in # 501, the lens microcomputer 3
Initial settings such as clearing of the built-in RAM 20 and initial data set, input / output setting of each port, communication mode setting with the camera microcomputer 240, and the like are performed. At step # 502, various operation commands transmitted from the camera microcomputer 240 are waited for. Thereafter, the process proceeds to the next when the reception is completed.

In step # 503, if the operation command from the camera is a command for requesting transmission of various kinds of unique information of the lens, the process proceeds to step # 504, where the unique information corresponding to the current zoom position is read out from the lens unique information storage unit 318. Microcomputer 24
0 and returns to # 502.

In step # 520, if the operation command from the camera is a lens battery check command, the flow advances to step # 521 to receive the detected voltage value from the camera body. And #
At 522, the check voltage value VL stored in the check voltage VL storage circuit 317 is compared with the received detection voltage value. Here, if the detected voltage value is lower than the check voltage value VL, the process proceeds to # 524, where "1" is transmitted to the camera body as a signal to warn of battery replacement, and the process returns to # 502. on the other hand,
If the detection voltage is high, the process proceeds to # 523, where "0" is transmitted to the camera body as a signal indicating that the battery capacity is sufficient, and # 50 is transmitted.
Return to 2.

Hereinafter, the lens operation flow from # 507 to # 516 is the same as that in FIG. 5 described in the first embodiment, and the same reference numerals are given and the description is omitted.

Next, the operation flow of the camera control circuit 239 of the camera microcomputer 240 will be described. Camera control circuit 2
Since the main flow of 39 is the same as that of FIG. 6 described in the first embodiment, the description is omitted. However, # 403
Since only the battery check operation is different, description will be made with reference to FIG.

FIG. 10 is a control flow chart showing the battery check operation of # 403 in FIG. First, #
At 460, a control signal is output to the main mirror drive circuit 209, and the main mirror drive motor 208 is driven in reverse rotation to apply a load to the battery 223. In # 461, the control waits for 1 ms as a time for stabilizing the voltage drop of the battery. Then, in # 462, the analog input of the battery 223 is A / D converted and the voltage value is detected. In step # 463, the main mirror driving motor 208 is stopped.

Next, at step # 464, the lens microcomputer 320
To the lens battery check command, and then #
At 465, the detected voltage value detected at # 462 is transmitted.
Then, in # 466, the comparison result is received from the lens microcomputer 320. When the comparison result received from the lens is “0”, it means that the battery capacity is sufficient, and when the comparison result is “1”, it means that the battery replacement is in a warning state.

At # 467, it is determined whether or not the comparison result received from the lens is "1". Here, if "1", a warning is issued to the camera operator, and the process proceeds to # 470,
If not, proceed to the next step. In step # 469, the check voltage value VB stored in the check voltage VB storage circuit 225 is compared with the detected voltage value. At this time, if it is determined that the detected voltage value is lower than the check voltage value VB, a warning is issued to the camera operator and the process proceeds to step # 470. Otherwise, the process proceeds to the next step. In # 468, the LCD display circuit 220
4a is displayed on the external LCD 222 to inform the camera operator that the battery capacity is sufficient, and the process returns to the main flow.

At step # 470, a control signal is output to the LCD display circuit 220, and the display shown in FIG. 4C is displayed on the external LCD 222 to warn the camera operator that the battery capacity is insufficient and it is time to replace the battery. I do. When this warning display is performed, a standby command is transmitted to the lens microcomputer 320 in # 471 to set the lens microcomputer 320 to the low power consumption mode in order to simultaneously control the camera to prohibit the shooting operation. The camera microcomputer 240 is set to the low power consumption mode, and waits for battery replacement.

As described above, in the second embodiment of the present invention, the interchangeable lens is compared with the check voltage value VL for ensuring that all functions of the interchangeable lens operate normally and the detected voltage value received from the camera. The check voltage value VB or the detected voltage value VL is compared on the camera body side with the check voltage value VB that ensures that all functions of the camera body operate normally.
When it is determined that the detected voltage value is lower, the camera operator is warned that it is time to replace the battery, thereby preventing malfunction of the camera and the interchangeable lens and wasteful replacement of the battery. Explained what can be done. Also,
Also in the second embodiment, the check voltage values VB and VL are not limited to one each, and by preparing a plurality of them, it becomes possible to appropriately show the situation regarding the battery capacity to the camera operator. . For example, it is possible to pay attention to a decrease in battery capacity in advance before a warning display for sudden battery replacement is displayed. Furthermore, if the number of stored check voltages is increased, the capacity of the battery can be displayed in a bar graph.

[0080]

As described above, according to the interchangeable lens type camera systems of the first and third aspects of the present invention, the interchangeable check voltage value VB which guarantees that all functions of the camera body operate normally is used. Since the check voltage value VL, which ensures that all functions of the lens operate normally, and the detected voltage value of the battery are compared, it is possible to appropriately show the situation regarding the battery capacity to the camera operator. This has the effect of preventing malfunctions of the camera and the interchangeable lens, and eliminating battery waste and effectively utilizing the battery.

According to the interchangeable lens of the second aspect of the present invention, the check voltage value VL for ensuring that all functions of the interchangeable lens operate normally is communicated to the camera body. Since the check voltage value VB, which ensures that all the functions of the camera can operate normally, the check voltage value VL obtained from the interchangeable lens, and the detected voltage value of the battery can be compared with each other, the condition of the battery capacity is notified to the camera operator. Can be appropriately indicated, the malfunction of the camera and the interchangeable lens can be prevented, and the battery can be effectively used without waste.

Further, according to the interchangeable lens of the fourth aspect of the present invention, the check voltage value VL for ensuring that all functions of the interchangeable lens operate normally and the detected voltage value of the battery received from the camera body are compared. Since the comparison result is transmitted to the camera body, the camera body
B and the detected voltage value of the voltage detecting means, and it is possible to appropriately show the status regarding the battery capacity to the camera operator based on the comparison result and the comparison result received from the interchangeable lens. This has the effect of preventing the lens from malfunctioning, and effectively utilizing the battery without wasting the battery.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention.

FIG. 2 is a block diagram in which the present invention is applied to a single-lens reflex camera system.

FIG. 3 is a block diagram of an interchangeable lens to which the present invention is applied.

FIG. 4 is an explanatory diagram of an LCD display used for a battery check of the present invention.

FIG. 5 is a flowchart illustrating lens control of the interchangeable lens according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating camera control of a camera body according to the first and second embodiments of the present invention.

FIG. 7 is a flowchart illustrating a battery check operation according to the first embodiment of the present invention.

FIG. 8 is a flowchart illustrating a modified battery check operation according to the first embodiment of the present invention.

FIG. 9 is a flowchart illustrating lens control of an interchangeable lens according to a second embodiment of the present invention.

FIG. 10 is a flowchart illustrating a battery check operation according to a second embodiment of the present invention.

[Explanation of symbols]

 200 Camera body 220 LCD display circuit 223 Battery 225 Check voltage VB storage circuit (second storage means) 226 Voltage detection circuit (voltage detection means) 239 Camera control circuit (camera control means) 240 Camera microcomputer 300 Interchangeable lens 305 Electrical contact 317 Check Voltage VL storage circuit (first storage means) 319 Lens control circuit (lens control means) 320 Lens microcomputer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 17/18 G03B 17/18 C

Claims (4)

[Claims] 1. A camera system comprising: an interchangeable lens; and a camera body having a plurality of electrical contacts between the lens and the camera, communicating various information through the contacts, and supplying power from the camera to the lens. The first side has first storage means for storing a value relating to a check voltage for ensuring that all functions of the interchangeable lens operate normally, and lens control means for controlling the lens. Second storage means for storing a value relating to a check voltage for guaranteeing operation of the camera, voltage detection means for detecting a power supply voltage, and camera control means for controlling a camera, wherein the lens control means comprises: Send the value related to the check voltage of the storage means to the camera body,
The camera control unit compares the voltage value detected by the voltage detection unit with a value relating to the voltage of the first storage unit and a value relating to the voltage of the second storage unit of the camera body received from the interchangeable lens, respectively. An interchangeable lens camera system comprising a display unit for displaying a situation based on the comparison result. 2. A camera body capable of exchanging lenses, having a plurality of electrical contacts between the lens and the camera, communicating various information through the contacts, and supplying power from the camera to the lens. Second storage means for storing a value relating to a check voltage which guarantees that the operation is performed in a normal operation;
A voltage detection unit for detecting a power supply voltage; and a camera control unit for controlling a camera. The camera control unit relates to a voltage value detected by the voltage detection unit and a voltage of the first storage unit received from the interchangeable lens. Comparing the value and the value relating to the voltage of the second storage means of the camera body, respectively,
An interchangeable lens attached to a camera body having a display means for displaying a situation based on the comparison result, wherein a value relating to a check voltage for ensuring that all functions of the interchangeable lens operate normally is stored. 1 storage means, an electrical contact comprising a terminal provided for communicating with the camera body, a terminal receiving power supply from the camera body, and a value relating to a check voltage of the first storage means in the camera body. An interchangeable lens comprising control means for transmitting to an interchangeable lens. 3. An interchangeable lens in a camera system comprising: an interchangeable lens; and a camera body having a plurality of electrical contacts between the lens and the camera and communicating various information through the contacts and supplying power from the camera to the lens. The first side has first storage means for storing a value relating to a check voltage for ensuring that all functions of the interchangeable lens operate normally, and lens control means for controlling the lens. Second storage means for storing a value relating to a check voltage for guaranteeing operation of the camera, voltage detection means for detecting a power supply voltage, and camera control means for controlling a camera, wherein the lens control means is provided from a camera body. Receiving a detection voltage value of the voltage detection means, comparing a value relating to a check voltage of the first storage means with the detection voltage value, and Transmitting to the camera body, the camera control means transmits the detected voltage value detected by the voltage detecting means to the interchangeable lens, receives the comparison result from the interchangeable lens,
Display means for comparing a value relating to the voltage of the second storage means with a detected voltage value of the voltage detection means, and displaying a situation based on the comparison result and the comparison result received from the interchangeable lens. Interchangeable lens camera system. 4. A camera body capable of exchanging lenses, having a plurality of electrical contacts between the lens and the camera, communicating various kinds of information and supplying power from the camera to the lens through the contacts. Second storage means for storing a value relating to a check voltage which guarantees that the operation is performed in a normal operation;
A voltage detection unit that detects a power supply voltage; and a camera control unit that controls a camera, wherein the camera control unit transmits a detection voltage value detected by the voltage detection unit to an interchangeable lens, and outputs a comparison result from the interchangeable lens. A camera body having display means for receiving and comparing a value related to the voltage of the second storage means with a detected voltage value of the voltage detection means, and displaying a situation based on the comparison result and the comparison result received from the interchangeable lens; A first storage means for storing a value relating to a check voltage for ensuring that all functions of the interchangeable lens operate normally, and a terminal provided for communicating with the camera body. And an electrical contact comprising a terminal receiving power supply from the camera body,
Control means for receiving a detection voltage value of the voltage detection means from a camera body, comparing a value related to a check voltage of the first storage means with the detection voltage value, and transmitting a comparison result to the camera body. Interchangeable lens to feature.