JP2000194049A - Camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera system by which the battery of an accessory device can be checked by the operation of an operation member arranged at a camera body side on a condition that the accessory device obtained by loading the battery is attached to the camera body and the checked result of the battery can be confirmed at the camera body side. SOLUTION: This camera system is constituted so that not only the battery 19 loaded in the camera body 1 but also the battery 35 loaded in the accessory device can be checked by using the operation member such as the power source switch 20 arranged at the body 1 side on the condition that the accessory device such as an interchangeable lens 2 is attached to the camera body 1. Besides, the checked result can be displayed at the display part 16 of the body 1 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera system having a battery check function for checking the remaining battery capacity of a detachable interchangeable lens having a built-in battery on a camera body side.

[0002]

2. Description of the Related Art In general, there are known cameras such as single-lens reflex cameras to which various types of photographing lens barrels (interchangeable lenses) can be mounted. In addition to the interchangeable lens, there are many accessory devices that can be attached to a camera to function, such as a strobe device for emitting auxiliary light and a winder device for feeding a film at high speed for continuous photographing.

[0003] In these accessory devices, a battery is separately provided from the camera drive battery in order to suppress the consumption of the battery of the camera and to prevent the camera from being enlarged due to an increase in the capacity of the battery. May be loaded.

In the case of an interchangeable lens, for example,
There is also a type incorporating a battery as disclosed in JP-A-64816. In this interchangeable lens, the remaining capacity check of the loaded battery (battery check) is provided in the interchangeable lens and is performed by operating a battery check operation member independent of the camera body side, and the result is checked. A warning is issued using a warning display circuit, a sounding circuit, and the like in the interchangeable lens. In other accessory devices, the battery check may be performed separately from the camera.

On the other hand, the battery check of the battery loaded in the camera body is performed by operating a battery check operation member provided in the camera body, and the result is checked using a battery check warning unit in the camera body. Warning is given by warning sound and display.

[0006]

When using a camera equipped with an accessory device into which a battery is mounted as described above, when checking the battery, if the camera is attached to the camera body, the camera body side The battery check on the accessory device and the battery check on the accessory device side must be operated separately to check each display section at different locations, which is time-consuming and particularly troublesome to perform during shooting. Had become.

Accordingly, the present invention enables a battery check of an accessory device by operating an operation member on the camera body side in a state where an accessory device loaded with a battery is mounted on a camera body. It is an object to provide a camera system that can be confirmed on the side.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an accessory device in which batteries are individually loaded;
In a camera system including a camera body to which the accessory device can be connected, the camera body transmits a battery check command for instructing the connected accessory device to execute a battery check operation, and the battery A camera system comprising: display means for displaying a battery check operation result sent from the accessory device in response to a check command.

Further, the display means displays the battery check result of the body itself and the battery check result of the accessory device independently of each other, and the display means displays the battery check result of the body itself. The battery check result of the accessory device is displayed as a common display member.

In the camera system having the above-described configuration, the battery check of the battery loaded in the accessory device is performed by using the operation member on the camera body side with the accessory device mounted on the camera body. The result of the battery check is displayed on the camera body.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In describing the camera system of the present invention, an interchangeable lens (zoom lens) will be described as an example of an accessory device to be mounted.

FIG. 1 shows an example of the appearance of a camera system according to an embodiment of the present invention.

This camera system includes a camera body 1
And an interchangeable lens 2 detachable from the camera body 1.

The outer surface of the lens barrel 3 of the interchangeable lens 2 has a TELE switch 4 for moving the photographing lens to perform zooming on the telephoto (TELE) side, and a WIDE switch for performing zooming on the wide-angle (WIDE) side. 5, a preview switch 6 for performing a preview, and an AF lock switch 7 for performing an AF lock. Further, inside the lens barrel 3, a battery 35 for driving a motor for moving a member provided in the lens barrel, a photographing lens, and the like is mounted.

A power switch 20 and a release switch (1R switch, 2R
Switch) and the liquid crystal display panel 1
6a, and a lens mount 9 for mounting the interchangeable lens 2 is provided on the front. A battery 19 for driving the camera is mounted inside the camera body 1.

Next, FIG. 2 shows a circuit configuration of the camera body 1 and the interchangeable lens 2 and will be described.

First, the configuration of the camera body 1 will be described.

In the camera body 1, a microcomputer (BCPU) 11 for controlling the entire sequence of the camera system is arranged.

The BCPU 11 has an exposure control circuit 12 for controlling exposure of a body such as a shutter (not shown).
And a photometric circuit 13 provided in a not-shown finder section.
1RW switch 14 for turning on the first stroke of the release operation to perform distance measurement and photometry, and 2R switch 1 for turning on and performing the exposure in the second stroke of the release operation
5 are provided.

A display unit 16 including a liquid crystal display panel (LCD) 16a for displaying a set photographing mode and a warning mark, and a BCPU 11 are provided in the camera body 1.
And a display driver unit 17 for driving the display unit 16 under the control of.

The BCPU 11 further includes a camera body 1
A battery 19 loaded therein and a power switch 20 for supplying power from the battery 19 to the camera by turning on the battery 19 are provided. Further, when the remaining capacity of the battery 19 is checked, that is, a battery check is performed. Occasionally, a dummy load 1 in the body that takes out a load current from the battery 19
8 are provided.

Also, by dividing the voltage VEB of the battery 19,
Voltage dividing resistors 21 and 22 for outputting to the BCPU 11;
A DC / DC converter 23 for obtaining a voltage VCCB obtained by boosting the voltage VEB of the battery 19 is provided. Voltage V
EB is used as a power supply voltage of a drive system inside the camera body 1, and the voltage VCCB is used as a power supply voltage of a control circuit system such as the BCPU 11.

Further, the BCPU 11 has an automatic exposure (A
F) section 24 and a film winding / rewinding mechanism section 25 are provided. The camera body 1 is provided with a communication mount contact 26 on the lens mount 9 of the camera body 1 for mounting an interchangeable lens. ing.

Next, the circuit configuration of the interchangeable lens 2 will be described.

The interchangeable lens 2 has a microcomputer (LC) for controlling the entire sequence in the lens barrel 3.
PU) 31 is provided. Then, a Z motor 32 for moving a photographing lens (not shown) for driving zooming, a zoom drive circuit 33 for driving and controlling the Z motor 32 under the control of the LCPU 31, a driving amount for zooming (focal length of the lens) ) And a zoom encoder 34 for monitoring the

A battery 35 is removably mounted in the lens barrel 3. The output voltage VEL of the battery 35 is applied to the voltage dividing resistors 36 and 37 via the switch section 38, where the voltage is divided and output to the LCPU 31. And DC / DC
A converter 39 is provided to obtain a boosted output VCCL in which the output voltage VEL of the battery 35 is boosted. The output voltage VEL is used as a power supply voltage of a drive system inside the interchangeable lens 2, and the boosted voltage VCCL is
It is used as a power supply voltage for a control circuit system such as

Further, an in-lens dummy load 40 for taking out a load current from the battery 35 when performing a battery check described later is connected to the LCPU 31.

An LD (lens / lens) for driving a focusing mechanism for focusing the taking lens of the interchangeable lens 2 is used.
Drive) motor 41 and L
LD motor drive circuit 42 for driving D motor 41
And an LD encoder 43 for monitoring the drive amount of the LD motor 41. An aperture mechanism 44 and a stepping motor 45 for driving the aperture mechanism 44
And the stepping motor 45 under the control of the LCPU 31.
Motor driving circuit 46 for driving control of
Are provided.

The interchangeable lens 2 has a mount for mounting and fixing to the camera body 1, and the mount has a mount contact 47 electrically connected to the mount contact 26 at the time of mounting. Is provided.

A communication signal communicated between the BCPU 11 and the LCPU 21 via the mount contact 26 provided on the camera body 1 and the mount contact 47 provided on the interchangeable lens 2 will be described.

In this embodiment, the mounting contacts 26 and 47
Signal lines that are connected via the NETL signal line (communication request signal), the LINTB signal line (communication request signal), the SCLK signal line (synchronous clock signal), the SDATA signal line (data signal), and the GND signal line (ground) ).

Among these signal lines, the BINTL signal line communicates a BINTL signal, which is a communication request output from the BCPU 11 to the LCPU 31, and
A LINTB signal, which is a communication request output from the LCPU 31 to the BCPU 11, is communicated to the B signal line.

An SCLK signal serving as a synchronous clock for data communication is transmitted to the SCLK signal line. That is, when communication is performed from the BCPU 11 to the LCPU 31, the CLK signal is output from the BCPU 11 to the LCPU 31. Conversely, when communicating from the LCPU 31 to the BCPU 11, the LCPU 31
Outputs a CLK signal to the BCPU 11. In the communication standby state, the BCPU 11 and the LCPU 31
Are set as output ports.
Each outputs an L level.

The SDATA signal is a data signal line for communication. When performing communication from the BCPU 11 to the LCPU 31, the BCPU 11
For 1, the DATA signal is output. But LCP
When communication is performed from the U31 to the BCPU 11, L
The CPU 31 outputs a DATA signal to the BCPU 11. In the communication standby state, the BCPU 11 and LC
Both SDATA terminals of the PU 31 are set as output ports, and both output L level.

The communication from the BCPU 11 to the LCPU 31 will be described with reference to the timing chart shown in FIG.

Here, an example is shown in which 8-bit command data is transmitted once. Of course, depending on the type of communication, 8-bit data may be transmitted a plurality of times. At time T1, the BCPU 11 lowers the BINTL signal, and makes a communication request from the BCPU 11 to the LCPU 31.

Next, at time T2, the LCPU 31
The LINTB signal falls and responds to the communication request, and then at time T3, the LCPU 31
Start the NTB signal.

Then, from time T4 to time T5, the BCPU
Reference numeral 11 outputs the SDATA signal and the SCLK signal at the timings shown in the figure, performs 8-bit data communication, and transmits command data. At the subsequent time T6, the BINTL signal rises, and a series of communication ends.

FIG. 4 also shows the LCPU 31 to the BCPU
11 shows a timing chart shown in the communication with respect to FIG. In this communication, the above-described BCPU 11
The communication performed with the CPU 31 and the CPU are exchanged at the same timing, and the detailed description is omitted here.

The control sequence of the LCPU 31 in the interchangeable lens 2 will be described with reference to the flowchart shown in FIG.

First, when a battery is loaded in the interchangeable lens 2, power is supplied to the LCPU 31 to turn it on, and the internal memory is initialized (step S1).

Next, it is determined whether or not the interchangeable lens 2 is mounted on the camera body 1 (step S2). As described above, in the communication standby state, the BCPU 11 and the LCP
The SCLK terminal and the SDATA terminal of U31 are both set as output ports, and each output L level.

In the determination of step S2, the SCLK terminal and the SDATA terminal of the LCPU 31 are set to the state of the input terminal with the pull-up resistor, and the SCLK signal line and the SCLK terminal are set.
The level of the DATA signal line is determined. The determination is
If the level is L level, the interchangeable lens 2 is assumed to be mounted on the camera body 1, and if the level is H level, the SCLK signal line and the SDATA signal line are in an open state, that is, the interchangeable lens 2 is not mounted. .

In step S2, the interchangeable lens 2
If is not mounted on the camera body 1 (NO), a subroutine "body non-mounting process" described later is performed, and the process returns to step S2. However, if the interchangeable lens 2 is mounted on the camera body 1 (YES), the camera body 1
It is determined whether or not there is a communication request signal (step S
3).

If the BINTL signal line is at the L level, it is determined that there is a communication request (YES), communication with the camera body 1 is performed, and command data and control data are input from the camera body 1 (step S5). But BINT
If the L signal line is at the H level, it is determined that there is no communication request (NO), and the process returns to step S2.

Next, it is determined whether or not the command data from the camera body is "manual operation enable" (step S6). If the determination is "manual operation enable" (YES), a subroutine "manual operation enable" sequence is performed (step S7), and the process returns to step S5. However, if it is not “manual operation enable” (NO), it is determined whether or not the command data from the camera body 1 is “AV narrowing” (step S8).

If the discrimination is AV narrowing down (YE
S) Since the "step-down number data" is transmitted as control data following the command data from the camera body, the stepping motor drive circuit 46 drives the stepping motor 45 in accordance with the data.
The aperture is narrowed down by the aperture mechanism 44 (step S9).

Next, communication with the camera body 1 is performed,
After transmitting the command data indicating “AV narrowing down” to the camera body 1 (step S10), the above-described step S10 is performed.
Return to 2. However, if it is not AV narrowing down in step S9 (NO), the command from the camera body 1
It is determined whether or not the data is "AV release" (step S11).

In this determination, if "AV release" (YES), the stepping motor drive circuit 46 drives the stepping motor 45, and the aperture mechanism 44 opens the aperture (step S12). Next, communication with the camera body 1 is performed, and command data indicating “AV release end” is transmitted to the camera body 1 (step S1).
3), and return to step S2.

However, in the determination in step S11, "AV
If it is not "open" (NO), it is determined whether or not the command data from the camera body 1 is "LD drive" (step S13). If the command data is “LD drive” (YES), “LD drive amount” and “LD drive direction” are transmitted as control data following the command data from the camera body 1. Then, the LD motor 41 is driven by the LD motor drive circuit 42 according to the data, and the photographing lens is focused by the focusing mechanism (step S15).

Thereafter, communication with the camera body 1 is performed,
Command data indicating "LD drive end" is transmitted to the camera body 1 (step S16), and thereafter, the process returns to step S2.

However, if the command data is not "LD drive" in the determination in step S14, (N
O), it is determined whether or not the command data from the camera body 1 is "read focal length" (step S1).
7). If the command data is “read focal length” (YES), the zoom encoder 33
Then, the value of the zoom encoder is read (step S1).
8) The focal length is calculated from the value of the zoom encoder 33 (step S19). Communication with the camera body 1 is performed, and "focal length data" is transmitted to the camera body 1 (step S20), and thereafter, the process returns to step S2.

However, when the command data is not "focal length read" in the determination in step S17 (N
O), it is determined whether or not the command data from the camera body 1 is "lens parameter reading" (step S21). If “read lens parameters in this determination” (YES), the ID number (identification number) of interchangeable lens 2 stored in LCPU 31 is transmitted to camera body 1 (step S22).

Next, the parameters of the interchangeable lens 2 stored in the LCPU 31 are transmitted to the camera body 1 (step S23), and thereafter, the process returns to step S2. The parameters of the interchangeable lens 2 include an open aperture value,
This is the number of steps down, the focal length variable range, and the like.

However, if it is determined in step S21 that the command data is not "lens parameter reading" (NO), it is determined whether or not the command data from the camera body 1 is "lens battery BC". Is determined (step S24). By this determination, “Battery B in lens B
If "C" (YES), a battery check of the battery 35 loaded in the interchangeable lens 2 is performed (step S2).
5). A routine for checking the battery 35 loaded in the interchangeable lens 2 will be described later.

Thereafter, communication with the camera body 1 is performed,
The “battery check result” obtained in step S25 is transmitted to the camera body 1 (step S26),
The process returns to step S2. However, the above step S24
Is not "Battery in Lens BC" (N
O), returning to step S2.

Next, the battery check of the battery loaded in the interchangeable lens in step S25 shown in FIG. 5 will be described with reference to the flowchart shown in FIG.

First, the in-lens dummy load 40 is set to the operating state, and a setting is made so that a predetermined load current flows from the battery 35 (step S31). Next, the 10 mSEC timer is operated (step S32), and the switch unit 38 is turned on (step S33). And the voltage VE
The voltage obtained by dividing L is input to the A / D conversion terminal of the LCPU 31 to perform A / D conversion (step S34).

Next, after the switch unit 38 is turned off (step S35), the dummy load 40 in the lens is turned off.
The state is changed to the F state (step S36).

Next, the battery of the battery 35 is checked, that is, the level of the battery voltage is determined. First, an A / D conversion value obtained by converting the divided voltage is compared with a predetermined first voltage level BC1 (step S37), and the A / D conversion value is higher than the first voltage level BC1. If (YE
S), the state of the battery is considered to be in a good state, an OK determination is made (step S38), and the routine returns.

However, when the A / D converted value is lower than the first voltage level BC1 (NO), a predetermined second voltage level BC lower than the first voltage level BC1 is set.
2 is compared with the A / D converted value (step S39).

In this comparison, if the A / D converted value is higher than the second voltage level BC2 (YES), it is regarded as a warning level, and a warning is determined (step S4).
0), return. However, when the A / D conversion value is lower than the second voltage level BC2 (NO), the battery is regarded as unusable, and an NG determination is made (step S4).
1) Return.

Here, the interchangeable lens 2 in the present embodiment
The function of each operation member provided on the interchangeable lens 2 is different between a state in which the operation member is mounted on the camera body 1 and a case in which the operation member is not mounted on the camera body 1 (a single interchangeable lens).

Table 1 below shows a list of the functions of these operating members.

[0066]

[Table 1]

Next, the subroutine "manual operation enable" shown in step S7 in FIG. 5 will be described in detail with reference to the flowchart shown in FIG.

First, ON / OFF of the TELE switch 4
The state is determined (step S50). If the state is ON (YES), the Z motor 32 is driven by the zoom drive circuit 34 based on the control of the LCPU 31 to start the TELE drive (zooming to the TELE side) (step S50). S5
1).

Thereafter, the zoom encoder value output from the zoom encoder 33 is monitored, and it is determined from the value whether or not the zooming mechanism is in contact with the TELE end (step S52). If the zooming mechanism has hit the TELE end in this determination (YES),
The Z motor 32 is decelerated by applying a short brake (Z motor short circuit) (step S53), and the Z motor 32 is turned off (non-operating) (step S5).
4).

Next, ON / OFF of the TELE switch 4
The state is monitored (step S55), and the apparatus waits until the TELE switch 4 is turned off (YES), and turns off.
If the state is reached (NO), a step S68 to be described later is performed.
Move to

In the determination in step S52,
If the zooming mechanism has not contacted the TELE end (NO), it is determined whether or not the TELE switch is ON (step S56). If the TELE switch is ON (YES), the process returns to step S52. If the TELE switch is OFF (NO), Z
Short brake to motor 32 (Z motor short circuit)
To reduce the speed (step S57).
Is set to the OFF (non-operation) state (step S58), and the routine goes to the next step S68.

In the determination in step S50,
When the TELE switch 4 is in the OFF state (NO),
The ON / OFF state of the WIDE switch 5 is determined (step S59). If it is ON in this determination (YE
S), based on the control of the LCPU 31, the zoom drive circuit 3
4 to drive the Z motor 32 to perform WIDE drive (WI
Zooming to the DE side) is started (step S60).

Next, by monitoring the zoom encoder value output from the zoom encoder 33, it is determined whether or not the zooming mechanism is in contact with the WIDE end (step S61). In this determination, the zooming mechanism sets the WI
If it hits the DE end (YES), a short brake (Z motor short circuit) is applied to the Z motor 32 to decelerate (step S62), and the Z motor 32 is turned off (non-operation).
The state is set (step S63). Thereafter, the ON / OFF state of the WIDE switch 5 is monitored (step S6).
4) Wait until the WIDE switch 5 is turned off (YES), and if it is turned off (NO), A
The ON / OFF state of the FL switch is determined (step S68).

However, if the zooming mechanism is not in contact with the WIDE end in step 61 (N
O), it is determined whether or not the WIDE switch 5 is ON (step S65). If the WIDE switch 5 is ON (YES), the process returns to step S61 and the WIDE is performed.
If the switch 5 is OFF (NO), the Z motor 32
Then, the motor is decelerated by applying a short brake (Z motor short circuit) (step S66), and the Z motor 32 is turned off (non-operating) (step S67).
Go to 68.

In the determination in step S68, AF
The ON / OFF state of the L switch 7 is determined. If the ON state is ON (YES), communication with the camera body 1 is performed.
An “AFL command” is transmitted to the camera body 1 (step S69). Here, in the camera body 1, "AF
L command ”, and performs AF lock processing.
Details will be described later.

In the determination in step S68,
If the AFL switch 7 is OFF (NO), or after transmitting the “AFL command” in step S69, the ON / OFF state of the PV switch 6 is determined. Communication with the camera body, and transmits a "PV start command" to the camera body (step S71). This "PV start command"
The camera body 1 that has received the message performs play view processing, which will be described later in detail.

Then, the ON / OFF state of the PV switch 6 is monitored (step S72), and the process waits until the PV switch 6 is turned off (NO).
S), communication with the camera body 1 is performed, and a “PV end command” is transmitted to the camera body 1 (step S7).
3). Thereafter, the process proceeds to step S74. At this time, the camera body 1 receives the “PV end command” and ends the play view processing.

However, if it is determined in step S70 that the PV switch 6 is in the OFF state (N
O), it is determined whether there is a communication request signal from the camera body 1 (step S74). This process is equivalent to the process of step S3 shown in FIG.

If there is a communication request signal in this determination (Y
ES), return. However, if there is no communication request signal (NO), it is determined whether or not the interchangeable lens 2 is mounted on the camera body 1 (step S74). This determination is the same as the processing in step S2 shown in FIG. 5 described above. In this determination, if the interchangeable lens 2 is attached to the camera body 1 (YES), the process returns to step S50, and if not (NO), the process proceeds to step S4 in the flowchart shown in FIG.

Next, the subroutine "body non-mounting process" of step S4 shown in FIG. 5 will be described in detail with reference to the flowchart shown in FIG.

Here, in the processing of the steps shown in FIG. 8, those equivalent to the processing of the above-described steps of FIG. 7 are denoted by the same reference numerals, and the description thereof will be omitted, and only the characteristic parts will be described. .

Steps S50 to S6 shown in FIG.
7 up to step S50 shown in FIG.
The same processing is performed up to 67.

In this subroutine, step S5
5, when the TELE switch 4 is turned off, when the Z motor 32 is turned off in step S58, when the WIDE switch 5 is turned off in step S64, or when the Z motor 32 is turned off in step S67.
Are turned off, step S8 is performed.
1 to determine the ON / OFF state of the AFL switch 7 (step S81).
S), “AFL switch processing” is performed (step S8)
2).

However, if the AFL switch 7 is in the OFF state (NO), or after the above-mentioned "AFL switch processing", the ON / OFF state of the PV switch 6 is determined (step S83). If there is (YE
S), “PV switch processing” is performed (step S8)
4) Return. If the PV switch 6 is in the OFF state (NO), the process returns. This “PV switch process” will be described in detail with reference to the flowchart shown in FIG.

Next, the subroutine "AFL switch processing" in step S82 shown in FIG. 8 will be described in detail with reference to the flowchart shown in FIG.

The processing from step S91 to step S108 is performed while the AFL switch 7 is depressed and the TELE
The processing performed when either the switch 4 or the WIDE switch 5 is pressed is shown.

First, ON / OFF of the TELE switch 4
The state is determined (step S91). If the state is ON (YES), the LD motor 41 is driven by the LD motor drive circuit 42 based on the control of the LCPU 31 to drive the LD in the infinite direction (in the direction in which the in-focus side is focused). LD motor 4
1 is started) (step S92).

Next, the LD encoder value output from the LD encoder 43 is monitored, and it is determined from the value whether or not the LD mechanism has reached the infinite end (step S9).
3) If the LD mechanism is in contact with the infinite end in this determination (YES), a short brake (LD motor short circuit) is applied to the LD motor 411 to decelerate (step S).
94), the LD motor 41 is turned off (non-operating) (step S95).

Next, ON / OFF of the TELE switch 4
The state is monitored (step S96), and the process waits until the TELE switch 4 is turned off (YES), and if it is turned off (NO), returns.

However, in the determination in step S93,
If the LD mechanism does not touch the infinite end (N
O), the ON / OFF state of the TELE switch 4 is determined, and if it is ON (YES), the above step S93 is performed.
And if the TELE switch 4 is in the OFF state (N
O), short brake (LD
(Motor short circuit) and decelerate (step S98)
The LD motor 41 is turned off (non-operating) (step S99), and the process returns.

In the determination in step S91, TEL
If the E switch 4 is in the OFF state (NO), then the ON / OFF state of the WIDE switch 5 is determined (step S100). If the determination is ON (YES), the LD motor 41 is driven by the LD motor drive circuit 42 based on the control of the LCPU 31 to drive the LD in the near direction (to move the LD motor 4 in the direction in which the focus is on the closest side).
1 is started) (step S101).

Then, the LD encoder value output from the LD encoder 43 is monitored, and based on the value, the LD encoder
It is determined whether the mechanism is in contact with the near end (step S102). Here, when the LD mechanism is in contact with the near end (YES), the LD motor 41 is decelerated by applying a short brake (LD motor short circuit) (step S103), and the LD motor 41 is turned off (step S103). (Inoperative) state (step S104). Next, WIDE
Monitor the ON / OFF state of the switch 5 (step S
105), waits until the WIDE switch 5 is turned off (YES), and if it is turned off (N
O), return.

If it is determined in step S102 that the LD mechanism is not in contact with the closest end (N
O), the ON / OFF state of the WIDE switch 5 is determined (step S106).

If it is determined that the WIDE switch 5 is ON (YES), the flow returns to step S102. But W
When the IDE switch 5 is in the OFF state (NO), L
The D motor 41 is decelerated by applying a short brake (LD motor short circuit) (step S107), and the LD motor 115 is turned off (non-operating) (step S108), and the process returns.

If it is determined in step S100 that the WIDE switch 5 is OFF (NO), the ON / OFF state of the PV switch 6 is determined (step S109). Here, the PV switch 6 is
If the state is N (YES), "battery BC in lens (calculation of battery loaded in interchangeable lens 2 when camera body 1 is not mounted)" is performed (step S110). That is, when the AFL switch 7 and the PV switch 6 are pressed at the same time, “battery BC in the lens (camera body not mounted)” is performed. The subroutine of "battery in lens BC (no camera body attached)" will be described in detail with reference to FIG.

In step S109, the PV
If the switch 6 is in the OFF state (NO), a 2SEC timer (not shown) (a timer for counting 2 seconds) is reset and started (step S111). Then A
The ON / OFF state of the FL switch 7 is determined (step S112).

If the AFL switch 7 is ON (YES), it is determined whether the 2SEC timer has timed out (step S113). Until the time is up (NO), the above-mentioned step S112 is performed. Back to
If the time is up (YES), "LD motor
Infinite reset "is performed (step S114). That is, the LD motor 41 is driven to a position where infinity is achieved. That is, the "LD motor / infinite reset" is performed only when the AFL switch 7 is continuously pressed for 2 seconds or more.

However, if it is determined in step S112 that the AFL switch 7 is in the OFF state (NO),
To return.

Next, with reference to the flowchart shown in FIG. 10, the subroutine "P" of step S84 shown in FIG.
The “W switch process” will be described in detail.

First, ON / OFF of the TELE switch 4
The state is determined (step S121). If the aperture is ON (YES), it is determined whether the aperture is the minimum aperture (step S122). If the aperture is the minimum aperture (YE).
S), return, if not the minimum aperture (NO),
The aperture is narrowed down by one step (step S12
3) Return. In the interchangeable lens according to the present embodiment, the minimum step of the aperture is 0.5 EV (corresponding to a variation in which the amount of light transmitted through the aperture changes by 1 / √2).
Therefore, it is narrowed down by 0.5 EV.

In step S121, TE
When the LE switch 4 is in the OFF state (NO), WI
The ON / OFF state of the DE switch 5 is determined (step S124).

If the WIDE switch 5 is ON (YES), it is determined whether or not the aperture is an open aperture (step S125). If the aperture is an open aperture (YE)
S), and return. However, if the aperture is not open (N
O), the aperture is opened by one step (0.5 EV) (step S126), and the process returns.

If it is determined in step S124 that the WIDE switch 5 is OFF, (N
O), the ON / OFF state of the AFL switch 7 is determined (step S127).
S), a subroutine "battery in lens BC (camera body not mounted)" described later is performed (step S128), and the process returns. This “battery in lens BC (no camera body attached)” is executed when the AFL switch 7 and the PV switch 6 are simultaneously pressed.

However, in the determination in step S127,
If it is in the OFF state (NO), the 2SEC timer (timer for counting 2 seconds) is reset and started (step S129).

Thereafter, the ON / OFF state of the PV switch 6 is determined (step S130), and if it is ON (YES), it is determined whether or not the 2SEC timer has timed out (step S131). If it is in the state (NO), the process returns.

In step S131, if the time has not elapsed yet (NO), the process returns to step S130 to continue counting, and if the time has elapsed (Y
ES), it is determined whether or not the aperture is the minimum aperture (step S132). If the aperture is at the minimum aperture (YES), the aperture is driven until it is opened (step S133), and the process returns. However, if the aperture is not at the minimum aperture (NO), the aperture is driven until the aperture reaches the minimum aperture state (step S1).
34) Return.

Next, the subroutine "battery in lens BC (no camera body mounted)" will be described in detail with reference to the flowchart shown in FIG.

First, the in-lens dummy load 40 is set in the operating state so that a predetermined load current flows from the battery (step S141). Then, after operating the 10 mSEC timer (step S143), the switch unit 38 is turned on (step S143). According to the ON state of the switch section 38, the voltage obtained by dividing VEL is input to the A / D conversion terminal of the LCPU 31, and the voltage is A / D converted (step S144).

After that, the switch unit 38 is turned off (step S145), and the dummy load 40 is turned off (step S146).

Next, the battery voltage is evaluated. First, the A / D conversion value is compared with a predetermined first voltage level BC1 (step S147). If the A / D conversion value is higher (YES), the state of the battery is changed. It is determined that the state is good and the level is OK, and N = 3 is set (step S148).

However, in step S147, A
If the / D conversion value is lower than the first voltage level BC1 (NO), the value is compared with a second voltage level BC2 set lower than the first voltage level BC1 (step S1).
49).

In this comparison, if the A / D conversion value is higher than the second voltage level BC2 (YES), it is determined that the current level is the warning level, and N is set to N = 1 (step S).
150). However, when the A / D conversion value is the second voltage level B
If it is lower than C2 (NO), the battery is
It is determined that the state is the G level state, and the mode shifts to the stop mode (step S151).

Next, after N is set to 1 or 3,
Loop counter L = 0 is set (step S152),
The aperture is driven down until the aperture reaches the minimum aperture state (step S153). Thereafter, the diaphragm is driven until it is opened (step S154), and the loop counter L
Is added to (step S155).

Next, L and N are compared (step S15).
6) If L = N (YES), return; otherwise, return to step S153.

Here, with reference to the flowcharts shown in FIGS. 12, 13 and 14, the above-mentioned step S14 will be described.
The “camera body operation sequence” process from step 7 to step S156 will be described in detail.

In this process, the OK level, the warning level, and the NG level are determined based on the result of the battery check, and the aperture operation is performed based on the result. That is,
At the time of the OK level, the operation of opening the aperture, the minimum aperture, and the opening of the aperture is performed for three cycles. At the time of the warning level, the operation of the aperture is performed for one cycle. At the time of the NG level, the aperture operation is not performed, and all the operations are set to the operation locked state.

In this embodiment, the power switch 20 provided on the camera body functions as a switch for starting a battery check.
Is turned on, power is supplied to the BCPU 11, and the internal memory is first initialized (step S161). The BC of the battery 19 loaded in the camera body 1
(Battery check) is performed (step S162).
The battery BC in the camera body will be described with reference to FIG.

A result of the battery BC in the camera body is displayed on the display unit 16 (step S163).

Here, FIG. 16 shows an example of a display mode of the display section 16 and will be described.

The display section 16 has a liquid crystal display (LCD) 16a as shown. "Battery BC in the body"
BC result of OK level, warning level or NG
Determined to be one of the levels. In the case of the OK level, each determination result is represented by a mark as shown in FIG. 16A, and a “B” mark 51 on the camera body 1 side.
And the “L” mark 52 on the interchangeable lens 2 side are lit and displayed.

The warning level is indicated by a mark as shown in FIG. 16B, and “B” on the camera body 1 side.
Mark 53 and an “L” mark 54 on the interchangeable lens 2 side
And are respectively lit and displayed.

When the NG level is further determined, FIG.
The camera body 1 is represented by a mark as shown in FIG.
The “B” mark 55 on the side and the “L” mark 56 on the interchangeable lens 2 side are blinkingly displayed. This blinking display is for making the user stand out. The LCD 16a is provided with a display area 57 for indicating a shooting mode other than the battery check.

In step S163, after displaying the determination result, communication with the interchangeable lens 2 is performed, and the ID number (identification number) of the interchangeable lens 2 stored in the LCPU 31 inside the interchangeable lens 2 is received ( Step S16
4) Further, communication with the interchangeable lens 2 is performed, and the LCPU
The parameters of the interchangeable lens 2 stored in the inside of the camera 31 are received (step S165). The parameters of the interchangeable lens 2 include an open aperture value, the number of steps down, a variable focal length range, and the like.

Next, it is determined whether or not the communication in steps S164 and S165 has succeeded (step S16).
6) If the communication is successful (YES), it is considered that the interchangeable lens 2 is correctly mounted on the camera body 1, and
The camera body 1 communicates with the interchangeable lens 2 to perform “battery BC in the lens (battery check)” (step S167), and the camera body 1 receives the BC result from the interchangeable lens 2.

The details of this communication are described in step S25 in FIG.
And the processing in step S26, the description here is omitted. However, if the communication has failed in the determination in step S166 (NO), it is determined that the interchangeable lens 2 is not mounted, and the process returns to step S164.

Next, "lens BC display 1" is performed (step S168). That is, the result of “battery in lens BC (battery check)” is displayed as shown in FIG. 16 described above.

After the display, the battery 19 or 35 of either the camera body 1 or the interchangeable lens 2 becomes NG according to the result of the “battery BC in the body” in step S162 and the result of “battery BC in the lens” in step S167. It is determined whether or not the camera is at the NG level (step S169). If it is determined that the camera is at the NG level (YES), the camera cannot operate.
The 0SEC timer is operated (step S170), and the mode shifts to the stop mode (step S171). This operation is not displayed at all on the display unit 16 in the stop mode. Therefore, the timer is operated and when the batteries 19 and 35 of the camera body 1 and the interchangeable lens 2 are at the NG level, the NG of the corresponding battery is NG. This is for displaying the display only for about 60 seconds.

Next, in the determination in step S169, if the batteries 19 and 35 are not at the NG level (NO), the ON / OFF state of the 1R switch 14 is determined (step S169).
172).

If the 1R switch 14 is in the OFF state (NO), communication with the interchangeable lens 2 is performed and a command of “manual operation enable” is communicated (step S173). As a result, manual operation such as zooming can be performed on the interchangeable lens 2 side. Then, it is determined whether or not the command communication is successful (step S1).
74) If the communication fails (NO), the interchangeable lens 2
Is determined not to be mounted on the camera body 1, and the flow returns to step S164.

However, if this communication is successful, (Y
ES), it is determined whether an “AFL command” transmitted from the interchangeable lens 2 has been received (step S175).
If it can be received (YES), the AFL flag [← 1] is set (step S176). After the AFL flag is set, or when the “AFL command” is not received (NO), “P
It is determined whether or not the “V start command” has been transmitted (step S177). If the “PV start command” has been transmitted (YES), this is received, communication with the interchangeable lens 2 is performed, and “lens focus” is performed. Distance reading "(step S
178).

Thereafter, photometry is performed by the photometry circuit 13, and
Exposure calculation is performed based on the photometric result and other information (ISO sensitivity, lens focal length information, shooting mode information, and the like) (step S179). As a result of the exposure calculation, the aperture value (AV value) and the shutter time (TV
Value).

Next, communication with the interchangeable lens 2 is performed, and “AV narrowing down” is executed according to the obtained aperture value (step S180), and it is monitored whether a “PV end command” has been transmitted from the interchangeable lens 2 (step S180). Step S181),
Wait until the "PV end command" is transmitted (N
O), if it has been transmitted (YES), it is received and communicated with the interchangeable lens 2 to perform "AV release" (step S182), and returns to step S172. Similarly, in the determination of step 177, the interchangeable lens 2
If the “PV start command” is not transmitted from (NO), the process returns to step S172.

If it is determined in step S172 that the 1R switch 14 is in the OFF state (NO),
"Battery BC in body" is performed (step S183), and the same processing as in step S162 is performed.

Next, "body BC display 2" is performed (step S184). This display is not displayed on the display unit 13 at the OK level or the warning level.
However, only at the NG level, FIG.
Is flashed.

Next, communication with the interchangeable lens 2 is performed, and the same “battery in lens BC” as in step S167 is performed (step S185). "Lens BC display 2" is performed on the result (step S186). However, unlike the above step S168, the BC result of the "battery BC in the lens" is not displayed on the display unit 13 at the time of the OK level or the warning level, and is displayed on the display unit 13 only at the time of the NG level. The blinking of the mark 56 in (c) is performed.

After the display, the battery 19 or 35 of either the camera body 1 or the interchangeable lens 2 is determined based on the result of the “battery BC in the body” in step S183 and the result of “battery BC in the lens” in step S185. It is determined whether or not the level is NG (step S188). If the level is determined to be NG (YES), the 60SEC timer is operated as in step S170 (step S18).
9), and shift to the stop mode (step S19)
0).

This stop mode is performed in step S1.
This is equivalent to the process of 71.

Then, in the above step S188,
If the batteries 19 and 35 are not at the NG level (YES), communication with the interchangeable lens 2 is performed, and “reading of lens focal length” is performed.
Is performed (step S191). Thereafter, photometry is performed by the photometry circuit 13, and the photometry result and other information (IS
Exposure calculation is performed based on O sensitivity, lens focal length information, shooting mode information, and the like (step S192). As a result of the exposure calculation, an aperture value (AV value) to be controlled and a shutter speed (TV value) to be controlled are determined.

Next, it is determined whether or not the AFL flag has been set, that is, whether it is "1" or "0" (step S193).
When the FL flag is 0, the distance is measured using the AF unit 24, and the lens driving amount is calculated from the result of the distance measurement (step S194). Then, communication with the interchangeable lens 2 is performed, and “LD driving” is performed according to the obtained lens driving amount (step S195), and then the N / OFF state of the 2R switch 15 is determined (step S19).
6).

However, if the AFL flag is 1 in the determination in step S193, since the “AFL lock command” has been received from the interchangeable lens 2, A
The process moves to step S196 to enter the F lock state.

In the determination in step S196, 2
If the R switch 15 is in the OFF state (NO), the ON / OFF state of the 1R switch 14 is determined (step S1).
97) If the 1R switch 14 is ON (YE
S), returning to step S196, the 2R switch 15 is
Wait for N state, but 1R switch 14
If it is in the FF state (NO), the process returns to step S172.

In step S196, 2R
If the switch 15 is ON (YES), communication with the interchangeable lens 2 is performed, and “AV narrowing” is performed according to the aperture value obtained in step S192 (step S19).
8) Then, according to the shutter time similarly obtained,
Exposure is performed by driving a shutter (not shown) (step S199).

After exposure, communication with the interchangeable lens 2 is performed,
The “AV release” is performed (step S200), the film winding / rewinding mechanism 25 is driven to wind the film by one frame (step S201), and the AFL flag is reset (step S202).
Return to 72.

The in-body battery BD in step S162 in FIG. 12 will be described with reference to the flowchart shown in FIG.

First, the body dummy load 18 is set to the operating state (step S211) so that a predetermined load current flows from the battery 19. And the timer 10ms
The EC is operated (step S212), and the voltage obtained by dividing VEB is input to the A / D conversion terminal of the BCPU 11,
A / D conversion is performed to obtain an A / D conversion value (step S
213).

Thereafter, the dummy load 18 in the body is turned off.
The state is set to the F state (step S214), and the voltage of the battery 19 is evaluated.

First, the obtained A / D converted value is compared with a preset first voltage level BC11 (step S21).
5) If the A / D conversion value is higher than the first voltage level BC11 (YES), the state of the battery is good, and it is determined that the battery is at the OK level (step S216).

However, if the A / D converted value is lower than the first voltage level BC11 (NO), the A / D
The converted value is compared with a second voltage level BC22 set lower than the first voltage level BC11 (step S2).
17).

If the A / D conversion value is lower than the second voltage level BC22 (NO), the battery is determined to be in the unusable state and the NG level is determined (step S218). . If the A / D converted value is higher than the second voltage level BC22 (YES), it is determined that it is at the warning level (step S219).

After the OK level determination, the warning level determination, and the NG level determination, the process returns.

In the present embodiment, the start of each battery check of the battery loaded in the camera body and the battery loaded in the interchangeable lens is performed in conjunction with the operation of the power switch provided on the camera body. Alternatively, another operation member may be substituted or a battery check switch may be separately provided.

According to the present embodiment, the battery check of the battery in the interchangeable lens can be performed using the operation member on the camera body side with the interchangeable lens mounted on the camera body. The result of the battery check can be displayed on the camera body side.

Therefore, an operation member for performing a battery check and a display portion for displaying the result are not required on the interchangeable lens, and cost reduction can be realized.
Also, for the photographer, the battery check of the battery in the interchangeable lens is not troublesome and can be displayed at the same display location by operating one operation member, so that the checking operation can be easily performed even during the photographing. It can be carried out.

In this embodiment, an interchangeable lens is used as an example of an accessory device mounted on a camera. However, the present invention is not limited to this, and any accessory device mounted on the camera and driven by a power supply can be used. It can be easily applied to accessory devices.

Although the above embodiments have been described, the present invention includes the following inventions.

(1) A battery check command for outputting a command signal to the interchangeable lens in order to perform a battery check of the battery inside the interchangeable lens in a camera body to which an interchangeable lens containing a battery can be attached. A camera body comprising output means is provided.

(2) A camera body to which an interchangeable lens with a built-in battery can be attached, wherein the battery check result of the battery inside the interchangeable lens is received from the interchangeable lens by the receiving means and the receiving means. And a display means for displaying a battery check result.

(3) A battery check command output for outputting a command signal to the interchangeable lens in order to perform a battery check of the battery inside the interchangeable lens in a camera body to which an interchangeable lens containing a battery can be attached. A camera body comprising: means for receiving a battery check result of a battery inside the interchangeable lens from the interchangeable lens; and display means for displaying the battery check result received by the receiving means. I will provide a.

(4) An interchangeable lens characterized by comprising a battery, battery check means for checking the battery of the battery, and transmission means for transmitting the output of the battery check means to the camera body. .

[0160]

As described above in detail, according to the present invention, it is possible to check the battery of the accessory device by operating the operation member on the camera body side in a state where the accessory device loaded with the battery is mounted on the camera body. Thus, it is possible to provide a camera system in which the result of the battery check can be confirmed on the camera body side.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of an external configuration of an embodiment according to a camera system according to the present invention.

FIG. 2 is a diagram illustrating a circuit configuration of a camera body and an interchangeable lens according to the embodiment.

FIG. 3 is a timing chart for explaining communication performed from a BCPU to an LCPU shown in FIG. 2;

FIG. 4 is a timing chart for explaining communication performed from the LCPU to the BCPU shown in FIG. 2;

FIG. 5 is a flowchart illustrating a control sequence of an LCPU provided in the interchangeable lens.

6 is a flowchart for explaining a battery check of a battery loaded in the interchangeable lens shown in FIG.

FIG. 7 is a flowchart for explaining a subroutine “manual operation enable” shown in FIG. 5;

FIG. 8 is a flowchart for explaining a subroutine “body non-mounting process” shown in FIG. 5;

FIG. 9 is a flowchart illustrating a subroutine “AFL switch processing” shown in FIG. 8;

FIG. 10 is a flowchart illustrating a subroutine “PW switch process” shown in FIG. 8;

FIG. 11 shows a subroutine “battery B in lens” shown in FIG.
C (camera body not mounted) ".

FIG. 12 is a flowchart illustrating a “camera body operation sequence” process illustrated in FIG. 11;

FIG. 13 is a flowchart for describing the “operation sequence of the camera body” process following the flowchart shown in FIG. 12;

FIG. 14 is a flowchart for describing the “operation sequence of the camera body” process following the flowchart shown in FIG. 12;

FIG. 15 is a flowchart for explaining a battery BC in a body shown in FIG. 12;

FIG. 16 is a diagram illustrating an example of a display mode on a display unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera body 2 ... Interchangeable lens 3 ... Barrel 4 ... TELE switch 5 ... WIDE switch 6 ... Preview switch 7 ... AF lock switch 11 ... Microcomputer (BCPU) 12 ... Exposure control time 13 ... Photometry circuit 14 ... 1RW switch 15 ... 2R switch 16 ... display unit 17 ... display driver unit 18 ... body dummy load 19, 35 ... battery 20 ... power switch 21, 22, 36, 37 ... voltage dividing resistor 23, 39 ... DC / DC converter 24 ... automatic exposure (AF) section 25 ... Film winding / rewinding mechanism section 26, 47 ... Mount contact 31 ... Microcomputer (LCPU) 32 ... Z motor 33 ... Zoom drive circuit 34 ... Zoom encoder 40 ... Dummy load in lens 41 ... LD (lens)・ Drive) Motor 42 ... LD motor drive circuit 43 ... LD encoder 44 ... Throttle mechanism 45 ... Stepping motor 46 ... Stepping motor drive circuit

Claims (3)

[Claims] 1. A camera system comprising an accessory device in which batteries are individually loaded and a camera body to which the accessory device can be connected, wherein the camera body executes a battery check operation on the connected accessory device. A camera system comprising: transmitting means for transmitting a battery check command for instructing the battery check command; and display means for displaying a battery check operation result transmitted from the accessory device in response to the battery check command. 2. The camera system according to claim 1, wherein the display unit displays a battery check result of the body itself and a battery check result of the accessory device independently of each other. 3. The camera according to claim 1, wherein a battery check result of the body itself and a battery check result of the accessory device are displayed on the display means as a common display member. system.