JP3140521B2 - Camera exposure control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure control device for a camera having a plurality of exposure modes such as a program exposure mode.

[0002]

2. Description of the Related Art Recent cameras are provided with a plurality of exposure modes, and a photographer can select a desired exposure mode from these exposure modes by operating a switch or the like.

However, recently, the types of exposure modes have increased, and modes other than the exposure mode, such as a continuous shooting mode, have also increased. For this reason, a mode in which the mode is switched by a combination operation of a plurality of switches is generally used.

However, ordinary photographers rarely frequently switch between a large number of exposure modes. That is, typically only a few specific exposure modes are used. Therefore, switching by the conventional combination switch operation is complicated and cumbersome, and the mode intended by the photographer may not be easily set.

Further, in the conventional program exposure mode, the shutter speed and the aperture value are automatically determined in a fixed relationship (combination), so that the shutter speed and the aperture value outside the relationship are set by the photographer's intention. I couldn't. Further, in the conventional program shift mode, in the program exposure mode, both the aperture value and the shutter speed are simultaneously changed by operating a switch, and only one of them can not be changed.

Therefore, in the conventional camera, when it is desired to change only the shutter speed or the aperture value in the program exposure mode, the exposure mode must be changed from the program to the shutter speed priority or the aperture priority automatic exposure mode or the like. However, this exposure mode switching operation was troublesome.

[0007]

SUMMARY OF THE INVENTION The present invention has been made based on the awareness of the problems of the above-mentioned conventional exposure control apparatus. In a program exposure mode, there is provided a camera capable of changing a combination of a shutter speed and an aperture value with a simple operation. An object of the present invention is to provide an exposure control device.

[0008]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention comprises a photometric means for measuring the brightness of a subject; and a shutter speed and an aperture value as a pair of exposure factors each having a first precision.
Finer than the pair of exposed Factor first precision increments; first and second manual setting means and the setting in steps of
A program exposure mode that is automatically set in accordance with the photometric value of the photometric means at a second accuracy step ; one of the pair of exposure factors can be set by the corresponding manual setting means, and the other is set by the corresponding manual setting means. An automatic exposure mode that is automatically set according to the photometric value of the photometric means; and wherein the first or second manual
Manual that was operated when the file setting means was operated
The above-mentioned automatic setting that allows manual setting of the exposure factor corresponding to the setting means
Exposure mode forced change means forcibly changing to dynamic exposure mode
And the program exposure by the above-mentioned exposure mode compulsory change means.
When the camera is forcibly changed from the automatic exposure mode to the automatic exposure mode
Is set to one of the exposures set in the program exposure mode.
Exposure factor setting means for holding the exposure factor.
The factor setting means is provided by the forcible exposure mode changing means.
Forced change from the above program exposure mode to automatic exposure mode
If the setting has been changed, the manual setting
Program exposure mode before change in determinable exposure factor
Enter the value of the second precision step set in the first precision step.
The value of the first precision step rounded to the value
Set by manual setting of automatic exposure mode after changing the control
It is characterized by setting possible exposure factors .

According to this configuration, in the specific program exposure mode, one exposure factor is set to the second accuracy step set in the program exposure mode by a simple operation.
Is rounded to the first precision increment that can be set manually
And then manually set the first precision increment
Since the other exposure factor can be forcibly changed to the automatic exposure mode in which the other exposure factor is automatically set according to the photometric value, the same effect as changing the combination of exposure factors in the program exposure mode can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on illustrated embodiments. FIG. 1 is a top view showing the appearance of an embodiment of a single-lens reflex camera body equipped with an exposure control device of the present invention, FIG. 2 is a rear view showing a DX code reading section of the camera body, and FIG.
FIG. 2 is a front view of the camera body.

A shutter button 15 is provided at a front portion (subject side) of the upper surface of the grip portion 13 of the camera body 11. A Tv (TV) electronic dial 17 is provided behind the shutter button 15 (photographer side), and on the back of the grip portion 13 (photographer side), an Av (AV)
An electronic dial 19 is provided. The Tv electronic dial 17 and the Av electronic dial 19 are rotatable dials rotatable in the left-right direction. The rotation thereof can change the shutter speed Tv, the aperture value Av, and the exposure mode, as will be described in detail later. Note that these electronic dials 17 and 19 constitute a part of the first and second manual setting means or the shutter speed and aperture value manual setting means.

A clear button 23 is provided near the Av electronic dial 19 on the upper rear surface of the camera body 11.
Further, a hold button 25 is provided to the right of the clear button 23. Note that the clear button 23 constitutes a part of the clear switch means.

The electronic dials 17, 19, the clear button 23, and the hold button 25 are operated by the index finger or thumb without holding the camera body 11 when the photographer holds the camera body 11 in a normal shooting mode. It is configured to be operable.

On the upper surface of the camera body 11, an exposure correction / ISO lever 27 and an exposure mode / drive lever 29 which can be slid in two opposite directions from the neutral position on the left side of the pentaprism section, and the right side of the pentaprism section. Are provided with a main switch 31 slidable to three positions.

The patrone storage room 33 of the camera body 11
Inside is a DX pin DX that reads the data by touching the DX code printed on the surface of the film cartridge.
1 to DX6 are provided. These DX pins DX1 to DX
Numeral 6 contacts the portion of the DX code representing the ISO sensitivity Sv to read the data.

Further, a mount pin group (CONT, RES / Fmin3, SI / Fmi) for performing communication or the like with the photographing lens is mounted on the mount 35 of the camera body 11.
n2, Fmax1, A / M, Fmax2, - SCK - /
Fmin1). Each of these pins,
The camera body 1 is electrically connected to a corresponding mount pin provided on a mount (not shown) of the taking lens.
1 is the minimum F number Fmin (open F
No.) and lens data such as the maximum F-number Fmax, and communicates with control means (ROM or CPU) mounted on the taking lens to read lens data such as focal length f and lens type. Note that in this specification, symbols, signs, and the like sandwiched between “ ⁻ ” and “ ⁻ ” mean a so-called active low or inverted signal.

Next, an outline of a circuit configuration of a control system of the camera system will be described with reference to FIG. The camera body 11 has a CPU 41 and an IP
U43 is provided. The CPU 41 calculates and determines exposure factors (aperture value Av and shutter speed Tv), a basic photographing function such as a function for controlling an exposure, a function for controlling an automatic focus, and a control function. Means, priority exposure factor changing means, exposure mode forcibly changing means within a specific exposure mode, limit value setting means, exposure value holding means, manual shift means, and set mode switching means.

On the other hand, the IPU 43 has a shutter button 1
5, input interface of switches such as Tv electronic dial 17, Av electronic dial 19, various exposure mode setting means, display related control means, various exposure mode setting means, and power supply of CPU 41 on (power hold) and off. It also has a function as a memory device for storing a function as a regulator, a set mode, a shutter speed Tv, and the like. In addition, IPU43
Indicates switch information input determination, various mode displays, CPU4
ROM 43a for storing a program for performing communication with the camera 1 and communication with the photographing lens, various set modes,
A RAM 43b for temporarily storing various data such as a shutter speed and an aperture value, and an E ² PROM 43c for holding the number of films, ISO sensitivity and the like even after the power of the camera is turned off.

The IPU 43 includes a photographing lens 65.
And lens information such as the maximum F-number Fmax, the minimum F-number Fmin and the focal length f from the photographing lens 65, and further exchanges data concerning photographing with the CPU 41 via the bus. To control various operations and display related to photographing.

The output of the photometric element (light receiving element) 45 is logarithmically compressed by the operational amplifier 47 and the diode D1, amplified by the amplifier 49, and digitally converted (B _V , BV) corresponding to the apex value by the AD converter 51. And converted from ports P30 to P37 to CP
It is input to U41.

The A / D converter 51 is further connected to a diaphragm volume 53. Aperture volume 53
Works in conjunction with an aperture ring (not shown) of the taking lens 65, and outputs an aperture value corresponding to the rotational position of the aperture ring as an aperture voltage. This aperture voltage is converted into a digital value corresponding to the aperture value Av by the AD converter 51, and is input to the CPU 41 from the ports P30 to P37.

The CPU 41 activates the A / D converter 51 at a predetermined time, inputs the levels of the ports P30 to P37, reads the subject luminance signal and the aperture value signal set by the photographing lens 65, and converts them into the corresponding apex value. I do. The port P40 is a control port for input switching between the logarithmic compression voltage amplified by the amplifier 49 and the diaphragm voltage by the diaphragm volume 53.

DX P is connected to ports P 10 -P 14 of CPU 41.
Pins DX2 to DX6 are connected. The CPU 41 checks the levels of these ports P10 to P14 at a predetermined time and reads the ISO sensitivity SV (SV). And the CPU 41
Stores the input data such as the aperture value Av, the subject brightness Bv, and the ISO sensitivity Sv at a predetermined address of the RAM 41b.

The wind motor 55 winds and rewinds the film, and the mirror motor 57 raises and lowers the mirror. The operations of these motors 55 and 57 are controlled by the CPU 41 via the motor drive circuit 59.

The release magnet RL releases the mechanical shutter locking mechanism and starts the release operation.
The front curtain magnet ES1 and the rear curtain magnet ES2 lock and release the shutter mechanism (shutter curtain) from which the mechanical locking mechanism has been removed to control the travel of the shutter curtain. The narrowing-down operation of the narrowing-down mechanism for narrowing down is stopped. ON these magnets
/ OFF is controlled by the CPU 41 via the magnet drive circuit 61.

After the release, the EE pulse counter 63
E linked to the aperture mechanism linked to the mirror-up operation
An E pulse is generated and output to the port P DD of the CPU 41. The CPU 41 counts the change in the port PDD level, and when the count value reaches a value corresponding to the set aperture value Av, turns on the aperture magnet EE via the magnet drive circuit 61 to stop the aperture mechanism. , The aperture is held at the aperture value Av.

Further, ports PL0 to PL of IPU 43
6 has mount pins (A / M, CONT, RES / Fm
in3, SI / Fmin2, Fmax1, Fmax2,
^- SCK - ^/ Fmin1) is connected and are electrically connected to the imaging lens 65 through these mounting pin group (its memory means or control means). IPU43
Communicates with the photographing lens 65 via these ports PL0 to PL6 to open F-number Fmi
The lens data such as n, maximum F number Fmax, and focal length f are read.

Further, the photographing lens 65 is provided with a lens auto / manual switch 67 for discriminating whether the aperture is automatic or manual, in conjunction with the aperture ring 12. The lens auto / manual switch 67 is connected to the input port PL0 of the IPU 43 via the mount pin A / M. The IPU 43 inputs the level of this port PL0 and knows whether it is a lens auto or a lens manual. Note that the lens auto is an auto aperture that is stopped down by an aperture mechanism of the camera body up to an aperture value set in the camera body, and the lens manual is a manual aperture in which the aperture value is set on the shooting lens side. That is. In the description of the present embodiment, lens auto is also referred to as “body set”.

The input ports PC0 to PC2, PB0 of the IPU 43
To PB5 include a main switch SWMAIN, a photometric switch SWS, a release switch SWR, an exposure mode switch SWMODE, a drive switch SWDRIVE, an exposure compensation switch SW ± EF, an ISO sensitivity setting switch SWISO,
Clear switch SWCL and hold switch SWHOLD
Is connected.

The main switch SWMAIN is interlocked with the main switch lever 31, the photometering switch SWS and the release switch SWR are normally open switches interlocked with the shutter button 15, and the photometering switch SWS is turned on when the shutter button 15 is half-pressed. The full-press turns on the release switch SWR. The exposure mode switch SWMODE and the drive switch SWDRIVE are linked with the exposure mode / drive lever 29, and the exposure compensation switches SW ± EF and IS
O The sensitivity setting switch SWISO is the exposure compensation / ISO lever 2
Works with 7. Clear switch SWCL is clear button 2
3 and hold switch SWHOLD hold button 25
It is a normally open switch that works with each other.

The IPU 43 knows the ON / OFF state of each switch SW by inputting the level of each of the input ports PC and PB, and executes a process according to the state. IPU4
The Tv electronic dial 17 is connected to the pair of input ports PA0 and PA1, and the Av electronic dial 19 is connected to the other pair of input ports PA2 and PA3. The Tv electronic dial 17 and the Av electronic dial 19 have a well-known click stop rotation structure. That is, for example, at the click stop position, the pair of ports PA0 and PA1 are in a floating state.
Turns left or right, depending on the direction of rotation, one of the pair of ports first falls to the “L” level, then both fall to the “L” level, and then the “L” level first. Is the structure that returns to the floating state first. Since the order of the level changes of these ports PA0, PA1 or PA2, PA3 differs depending on the rotation direction, the IPU 43
The direction of rotation is identified by the order of this change.

The control port group PLCD of the IPU 43 has L
CD display panel 69 and finder display member 71
Is connected. This LCD display panel 69 has an IP
Under the control of U43, information relating to photographing such as an exposure mode, a shutter speed Tv, an aperture value Av, the number of photographed images, a drive mode, and various conditions (ISO sensitivity information, exposure correction ± EF information, etc.) are displayed. The display member 71 in the finder includes a shutter speed Tv, an aperture value Av, display elements 71a and 71b for identifying under, over, and an appropriate exposure value, and an element 71c for indicating that the memory is locked.

The above is the main circuit configuration of the camera system. Next, the operation of the present invention will be described in more detail with reference to flowcharts. The values such as the shutter speed Tv, the aperture value Av, and the subject brightness Bv used in the following calculation processing are all values for apex calculation.

[Main Processing of CPU] First, the CPU 41
Will be described with reference to the flowchart shown in FIG. This operation is executed by the CPU 41 based on a program stored in the ROM 41a.

When the photometering switch SWS is turned on while the main switch SWMAIN is turned on, power is supplied to the CPU 41 and the flow enters this flowchart. CPU 41
First, in step (hereinafter abbreviated as “S”) 11, each port P is initialized, and in S12, R
The AM 41b is initialized. Then, the DX code (ISO sensitivity Sv), the subject brightness Bv, and the aperture value Av are input (S13, S14, S15).

Next, the CPU 41 executes communication with the IPU 43 and receives data such as the set photographing exposure mode and exposure factor from the IPU 43 (S16). Then, the CPU 41 calculates an exposure factor by executing an exposure calculation according to the rule of the selected shooting exposure mode based on the ISO sensitivity Sv and the subject brightness Bv (S18). Then C
The PU 41 executes communication with the IPU 43 and executes S1.
8 (exposure factor (shutter speed T)
v and aperture value) data to the IPU 43 (S1).
9).

When the exposure factor is determined, the process proceeds to S20 to check whether the release switch SWR is ON. If the release switch SWR is ON, the release process (exposure,
When the power is off, the process returns to S13 to repeat the above processes S13 to S20.

[Communication Processing with IPU] The CPU 41 communicates with the IPU 43 to exchange various data. The communication will be described with reference to the timing chart shown in FIG. 6 and the command examples shown in Table 1. Although not shown, the CPU 41, I
PU43 each CE terminals, READY ^terminal, - SC
K ^- have a terminal and DATA terminal, these corresponding terminals are connected.

[Table 1]

First, the CPU 41 raises the level of the terminal CE to notify the IPU 43 that communication is to be performed. I
When monitoring that the terminal CE has changed to the “H” level, the PU 43 lowers and then raises the level of the READY terminal to notify the CPU 41 that the interrupt has been permitted. CPU41, when a monitor the interrupt enable, ^-
SCK ^- outputs the clock to the terminal, the command DATA
Output to terminal.

When the reception of the command is completed, the IPU 43 lowers and starts the READY terminal to notify the CPU 41 that the reception has been completed. And the CPU 41
Bruno ^- SCK ^- in synchronization with which the incoming clock signal transmitted from the terminal, whether to output the data corresponding to the received command to the DATA terminal, or receives data from the CPU 41.

When the transmission and reception of necessary data are completed by the above communication processing, the IPU 43 lowers the READY terminal level. The CPU 41 that received this CE
The terminal level is lowered, and the CPU communication is terminated by the IPU 43.
Inform When monitoring that the CE terminal level has dropped, the IPU 43 raises the READY terminal to
The PU communication ends.

[AE Subroutine] Next, the processing of the exposure calculation (AE (automatic exposure mode)) subroutine in S18 will be described with reference to the flowchart shown in FIG.

In the AE process, first, a DX code relating to ISO sensitivity is converted into an apex value (film sensitivity Sv) (S50). The DX code relating to the ISO sensitivity is composed of 5 bits, and in this embodiment, the DX pins (DX4, DX3, DX2, DX5, DX5) that come into contact with each code.
This is read by the 5 bits of 6). Here, the upper three bits (DX4, DX3, DX2) of the DX code constitute an integer part, and the lower two bits (DX5, DX6) constitute a decimal part. The decimal part is, for example, “01”, “1”
If it is "1", it is converted to an apex value of 0/3, if it is "10", it is converted to an apex value of 1/3, and if it is "00", it is converted to an apex value of 2/3 and added to the integer part. For example, in the DX code of ISO100, the integer part is "101" and the decimal part is "01".
The integer part is converted to an apex value of 5 and the decimal part is converted to an apex value of 0, thus Sv = 5.

Next, the subject brightness Bv is calculated by the formula B _VD = Bv +
7, the calculation subject brightness B suitable for calculation by (BVD = BV + 7)
_It is converted to _VD (S51). Further, the film sensitivity Sv and the exposure correction value Xv (XV) are respectively calculated by the equation S _VD = Sv.
−1, (SVD = SV-1), X _VD = 4−Xv, (XVD = 4−XV), the calculation sensitivity S _VD (SVD) and the calculation exposure correction value X _VD (XVD) are suitable for the calculation. Conversion is performed (S52).

The above processing prevents the values of the exposure factors for calculation (brightness B _VD , S _VD , X _VD ) from becoming negative,
The precision increment of each exposure factor is set to 1/8 Ev step to facilitate the apex calculation without considering the calculation accuracy. Since Sv and Xv are in increments of 1/3 step, exactly 1/8 step (second
Since the value cannot be converted to a value of (precision step) , rounding is performed to approximate 1/3 Ev to 3/8 Ev and 2/3 Ev to 5/8 Ev.

Then, a photometric correction amount MND based on the change of the open F-number is calculated (S53). This metering correction amount M
ND is a correction value for correcting the subject brightness Bv in order to keep the exposure amount given to the film surface constant irrespective of a change in the open F-number due to zooming (a change in the brightness of the lens). It is a unique value. The photometric correction amount MND is input from the photographing lens by IPU-lens communication described later, and is transmitted from the IPU 43 to S16.
Is transferred to the CPU 41 by the CPU-IPU communication of
Used in the PU 41.

Next, the calculation luminance B _VD , the calculation sensitivity S
_{Based on VD} , the exposure correction value for calculation X _VD and the photometric correction amount MND, the exposure value for calculation L _VD (LVD) is calculated by the following equation (S54). L _VD = B _VD + S _VD + X _VD + MND With the above processing, the preparation for the exposure calculation is completed.

Next, the CPU 41 checks which exposure mode is selected, and calls an exposure factor calculation subroutine based on the selected exposure mode (S55-).
1 to S55-n, S56-1 to S56-n). Then, the aperture value Av and the shutter speed Tv are calculated according to the algorithm of the selected exposure mode, and the process returns. If the exposure mode is not set properly, error processing is performed (S57).

"Error processing" In the error processing of S57,
The calculation shutter speed T _VD and the calculation aperture value A _VD are changed to the calculation maximum shutter speed T _VMAX and the calculation maximum aperture value A _VDMAX , _respectively , and the EE pulse number PNo is changed to the maximum value of 22.
AVDT, TV for converting the aperture value for calculation A _VD and the shutter speed T _VD for calculation to a value for IPU transmission
DT processing (details will be described later) is performed, and the process returns (see FIG. 8). The calculation shutter speed T _VD and the calculation aperture value A _VD may be configured such that both or one of _them is changed to the calculation minimum shutter speed T _VMIN or the calculation minimum aperture value A _VDMIN .

"Exposure calculation subroutine" In this embodiment,
A normal program (Prog) that automatically sets the shutter speed and aperture value based on the photometry result as the exposure mode
ram) Automatic exposure mode, automatic setting of aperture value from manually set shutter speed and metering result Lens auto shutter speed priority (EE LA) automatic exposure mode, automatic shutter speed from manually set aperture value and metering result Aperture priority (ES LA) auto exposure mode to set, manual (Manual
LA) exposure mode and bulb (Bulb LA) exposure mode, lens manual aperture priority (ES LM) automatic exposure mode, manual (Manual LM) exposure mode and (Bu
lb LM) bulb exposure mode.

Further, in the present embodiment, a hyper program (Hyper Program) as a limited program (Program LIMT) automatic exposure mode and a specific program exposure mode is used.
It has an automatic exposure mode, a lens auto hyper shutter speed priority (Hyper EE) automatic exposure mode, and a hyper aperture priority (Hyper ES) automatic exposure mode.

Next, the exposure factor calculation processing in each of the above exposure modes will be described with reference to the flowcharts shown in FIGS. "Hyperprogram" The hyperprogram exposure mode of the present embodiment is an exposure mode in which the mode can be freely changed between the program, EE automatic and ES automatic exposure modes. That is, by operating the electronic dials 17 and 19 and the clear button 23, the exposure mode can be freely changed among three types of specific exposure modes of the hyper program exposure mode, the hyper EE automatic exposure mode, and the hyper ES automatic exposure mode. The processes other than the switching of the exposure mode are the same as those of the hyper program and the normal program mode.

FIG. 9 is a flowchart relating to the hyper program exposure mode and the normal program exposure mode, and FIG. 10 is a program diagram thereof. Here, first, the relationship between A _VD (AVD) values for operation corresponding to the T _VD (TVD) values and the Av value for operation corresponding to the Tv value, based on the formula of S54, obtained by the following modifications . _{L VD = B VD + S VD} + X VD + MND = (Bv +7) + (Sv -1) + (4-Xv) + MND = (Bv + Sv -Xv + MND) +10 = Ev +10 = Tv + Av +10 = (Tv +5 4 / 8) + (Av + 4 4/8) = T _VD + A _VD Also, here, Ev = Bv + Sv−Xv + MND T _VD = Tv + 5 4/8 (1) A _VD = Av + 4 4/8. (2) Therefore, Tv−T is obtained by the equations (1) and (2).
The relational expression of _VD and Av- _AVD is obtained. Here, the constants 5 4/8 and 44/8 are added to T _VD and A _VD , respectively, but these may be any value as long as they add up to 10. In this embodiment, the values are determined so as to be substantially the same. Table 2 shows the Tv- _TVD correspondence table obtained by the above equation, and Table 3 shows the Av- _AVD correspondence table.

[Table 2]

[Table 3]

In the program exposure mode, first, S
The optimum calculation shutter speed T _VD is calculated from the calculation exposure value L _VD calculated in step 54 and a predetermined program calculation formula below, T _VD = 3/8 L _VD +4 6/8. Find the aperture value A _VD (S61 to S
78). The above equation can be obtained by substituting T _VD = Tv +5 4/8 and A _VD = Av +4 4/8 into Tv = 3/8 Ev +3 (formula based on the program line). The shutter speed T _VD for optimum calculation and the aperture value A _VD for optimum calculation are
Within the shutter capacity range of the camera body 11 (between the calculation maximum shutter speed T _VDMAX (TVDMAX) and the calculation minimum shutter speed T _VDMIN (TVDMIN)), and within the aperture capability range of the photographing lens (the calculation maximum aperture value A _The number of EE pulses that holds the optimum aperture value when it is between _VDMAX (AVDMAX) and the minimum aperture value for calculation A _VDMIN (AVDMIN), and holds the aperture of the taking lens at the optimal aperture value Av at the time of release. PN is calculated (S62, S64 to S66, S68, S69, S
72). Note the maximum shutter speed T _VDMAX here means the fastest shutter speed, the minimum diaphragm value A _{VDMI N} means open aperture value.

The maximum and minimum shutter speeds T _VMAX (TVMAX),
T _VMIN (TVMIN) is a value unique to the camera body 11,
In this embodiment, T _VMAX = 13 (1/8000 second), T
_VMIN = −5 (30 seconds). Therefore, the maximum and minimum shutter speeds T _VDMAX and T _VDMIN for the calculation are given by the equation T _VD =
The Tv +5 4/8, expressed as _{T VDMAX = T VMAX +5 4/8 =} 18 4/8 T VDMIN = T VMIN +5 4/8 = 0 4/8. These calculation shutter speeds T
_VDMAX and _TVDMIN are stored in the internal ROM 41 of the CPU 41 in advance.
a and is stored at a predetermined address of the RAM 41b during processing.

The maximum and minimum aperture _values A _VDMAX ,
A _VDMIN is _obtained from the maximum and minimum aperture values A _VMAX and A _VMIN which are values specific to the photographing lens and the equation, A _VD = Av +4 4/8. A _VDMAX = A _VMAX +4 4/8 A _VDMIN = A _VMIN +4 4 This is the value represented by / 8. The maximum and minimum aperture values A _VMAX and A _VMIN are inputted by the lens communication of S35 in the lens communication, and the calculated maximum and minimum aperture _values A _VDMAX and A _VDMIN for the calculation are _stored in the internal RAM 41 of the CPU 41.
b is stored at a predetermined address.

If the subject is too bright or too dark, the following processing is performed because the appropriate exposure factor does not fall on the program line.

(When too bright) Calculation shutter speed T
_{If VD} is greater than the maximum shutter speed _TVDMAX for calculation, the shutter speed _TVD for calculation is changed to the maximum shutter speed _TVDMAX for calculation, and then the optimum aperture value _AVD for calculation is obtained (S62 to S64). When the optimum calculation aperture value _AVD is within the aperture capability range, the EE pulse number PN is obtained based on the value (S
65, S66, S68, S72).

When the optimum calculation aperture value A _VD is larger than the maximum calculation aperture value A _VDMAX , the optimum calculation aperture value A _VD
Is changed to the calculation maximum aperture value A _VDMAX , and then the optimum calculation shutter speed T _VD is calculated again (S65 to S68). When the recalculated calculation shutter speed T _VD is greater than the calculation maximum shutter speed T _VDMAX , an appropriate exposure can be obtained regardless of the combination of the calculation shutter speed T _VD and the calculation aperture value A _VD. No, it is out of the so-called interlocking range.
While set in the communication out bit "1", obtains the EE pulse number PN Change the calculation shutter speed T _VD in the calculation the maximum shutter speed T _VDMAX (S69~S72).
When the recalculated calculation shutter speed _TVD is within the shutter capability range, proper exposure is possible.
The process of S71 is skipped, and the EE pulse number PN is obtained based on the optimal calculation aperture value _AVD (S69, S72).

When the Ev extra bit is set, the shutter speed display (maximum shutter speed T _VMAX ) and aperture display (maximum aperture value A _VMAX ) on the LCD display panel 69 shown in FIG. 41A blink.

When the aperture value A _VD for optimal calculation is smaller than the minimum aperture value A _VDMIN for calculation (when it is too dark), the aperture value A _VD for calculation is changed to the minimum aperture value A _VDMIN for calculation and then The shutter speed T _VD is calculated again. When the shutter speed T _VD is within the shutter capability range, these values are held, and the EE pulse number PN is set to 0 because the aperture is open (S73 to S75, S78).

If the optimal calculation shutter speed T _VD is smaller than the minimum calculation shutter speed T _DVMIN, underexposure occurs. Therefore, the Ev non-consecutive bit is set to “1” and the calculation shutter speed T _VD is set to “1”. After setting the minimum shutter speed T _DVMIN , the EE pulse number PN is set to 0 (S75 to S78).

When the above processing is completed, the aperture value for calculation A
_VD and the calculation shutter speed T _VD are set to IP
Aperture value A _VT for transfer to facilitate processing in U43
(AVT), it is converted to the transfer shutter speed T _VT (TVT) (S79, S80). The relationship between the calculation aperture value A _VD and the transfer aperture value A _VT , and the relationship between the calculation shutter speed T _VD and the transfer shutter speed T _VT are as follows. T _VT = T _VD +10 4/8 A _VT = A _V D The transfer shutter speed T _VT and the transfer aperture value A
_VT is data of 1 / 2Ev step (first precision step) . That is, when the data is sent from the CPU 41 to the IPU 43, the value calculated in the 1/8 Ev step (second precision step) is rounded to the 1/2 Ev step. In the IPU 43, since these values are used only for display, an accuracy of 1/2 Ev step is sufficient. Tables 2 and 3 above show examples of display categories corresponding to _TVD and _AVD .

With the above processing, the program exposure mode processing is completed, and a program line (diagram) shown by a solid line in FIG. 10 is obtained.

[Limited Program Exposure Mode] FIG.
1, the photographer sets the minimum and maximum shutter speeds T for calculation.
_{VD1 (TVD1), T VD2 (} TVD2) and calculating the minimum, maximum aperture A _VD1 (AVD1), can be set A _VD2 (AVD2), there is shown a subroutine Limited program (automatic exposure) exposure mode. The flow of this subroutine is the same as that of the program exposure mode subroutine, _except that the calculation minimum and maximum aperture _values A _VDMIN (AVDMIN) and A _VMAX (AVDMAX) are replaced with the set minimum and maximum aperture values A _VD1 and A _VD2 , respectively. (S8
5, S93, S86, S87), _except that the calculation minimum and maximum shutter speeds T _VDMIN (TVDMIN) and T _VDMAX (TVDMAX) are replaced with the set minimum and maximum shutter speeds T _VD1 and T _VD2 , respectively (S95, S97). , S82, S83, S
89, S91). The program diagram of the limited program exposure mode is as shown in FIG.

These minimum and maximum shutter speeds T for calculation are
_VD1 , _TVD2 and minimum and maximum aperture values A _VD1 , A _VD2 for calculation
Is set by turning on the hold button 25 and rotating the TV electronic dial 17 and Av electronic dial 19 when the limited program exposure mode is selected. The setting operation is shown in the flowcharts of FIGS. 39C and 39D described later.

[Hyper EE Automatic Exposure Mode] FIG.
Is a flowchart showing the first embodiment of the hyper shutter priority (EE) automatic exposure mode, and the dashed line in FIG. 10 is a diagram thereof. The basic processing related to the exposure factor calculation in the hyper shutter priority automatic exposure mode is the same as the processing in the normal lens auto shutter priority automatic exposure mode.

The hyper EE automatic exposure mode in this embodiment is an EE automatic exposure mode that is forcibly changed when the Tv electronic dial 17 is operated in a state where the hyper program exposure mode is selected. Further, the mode is returned from the hyper EE automatic exposure mode to the hyper program exposure mode by turning on the clear button 23, turning off the power, or the like, and the hyper ES automatic exposure mode is forcibly changed by rotating the Av electronic dial 19. .

Here, first, the set shutter speed T _VT (TVT) transferred from the IPU 43 by communication is read and converted into the calculation shutter speed T _VD (TVD) (S1).
01). Here, the relationship between the transfer shutter speed _TVT and the calculation shutter speed _TVD is as follows. T _VD = T _VT -10 4/8 Note that the transfer shutter speed is 1/2 Ev step (first
1/8 Ev steps (second accuracy step) of _TVD , which is the operation shutter speed, at the same time as the calculation.
Perform digit matching the (rounded) in only) data. Next, the optimum aperture value A _VD for calculation is calculated using the calculation shutter speed _TVD and the calculation exposure value _LVD (S102). If the optimum calculation aperture value _AVD is within the aperture capability range, the value is held and the EE pulse number PN is calculated (S103, S1).
04, S108-S110).

When the optimal calculation aperture value _AVD is out of the aperture capability range, that is, when the subject is too bright or too dark, the following processing is performed. If the optimal aperture value A _VD is larger than the maximum aperture value A _VDMAX for calculation (when it is too bright), the aperture value A _VD for calculation is changed to the maximum aperture value A _VDMAX for calculation, but this change results in overexposure. Therefore, after setting the Av external bit for identifying that the appropriate aperture value Av is out of the interlock, the EE pulse number PN is set (S103, S106 to S110). Av
When the bit is set, the aperture value display element of the LCD display panel 69 blinks at Av "22" to indicate that overexposure has occurred.

(When it is too dark) If the optimum calculation aperture value A _VD is smaller than the minimum calculation aperture value A _VDMIN , the calculation aperture value A _VD is changed to the minimum calculation aperture value A _VDMIN. Since underexposure occurs, the Av external bit is set, and then the EE pulse number PN is set to 0 (S103).
~ S105, S107, S108, S110). By the above processing, FIG.
A diagram indicated by a chain line at 0 is obtained.

When the setting of the number PN of EE pulses is completed, the aperture value for calculation A _VD and the shutter speed for calculation T _VD are converted into the aperture value for transfer A _VT and the shutter speed for transfer T _VT , respectively (AVDT, TVDT). End the processing (S11
1, S112).

[Hyper ES Automatic Exposure Mode] The first embodiment of the lens aperture hyper aperture priority (ES) automatic exposure mode will be described with reference to the flowchart shown in FIG. 16 and the diagram shown by the broken line in FIG. . The basic processing of the hyper ES automatic exposure mode is common to the processing of the conventional lens automatic (body set) ES automatic exposure mode.

The hyper ES automatic exposure mode in this embodiment is an ES automatic exposure mode that is forcibly changed by operating the Av electronic dial 19 when the hyper program exposure mode is selected. Also, the operation returns from the hyper ES automatic exposure mode to the hyper program exposure mode by turning on the clear button 23, turning off the power, or the like.
v It is forcibly changed by rotating the electronic dial 19.

Here, first, the set aperture value A _VT (AVT) transferred from the IPU 43 by communication is read and converted to the calculation aperture value A _VD (AVD) (S13).
1). Here, the transfer aperture value A _VT and the calculation aperture value A
Relationship with _{VD is} a _A VD ₌ A _VT. The aperture value for transfer is data of 1/2 Ev step, and at the same time as the calculation, it is 1/8 Ev step (2nd Ev) of _AVD which is the aperture value for calculation .
Performing the digit alignment to the accuracy of increments) data. Next, this value and the exposure value for calculation _LVD are used to calculate the optimal calculation shutter speed T.
_{The VD} is calculated (S132).

If the optimum calculation shutter speed T _VD is within the shutter capability range, the above values are retained and the EE pulse number PN is calculated based on the calculation aperture value A _VD (S133, S133).
S134, S138 to S140).

When the optimal calculation shutter speed _TVD is out of the shutter capability range, that is, when the subject is too bright or too dark, the following processing is performed. (When too bright) The optimum calculating shutter speed T _VD changes the greater if the calculating shutter speed T _VD than calculating the maximum shutter speed T _VDMAX in the calculation the maximum shutter speed T _VDMAX, the over-exposed by this change Therefore, the EE pulse number PN is set after setting the Tv external bit for identifying that the appropriate shutter speed Tv is outside the shutter capability (S133, S136 to S140).

(When it is too dark) If the optimal calculation shutter speed T _VD is smaller than the minimum calculation shutter speed T _VDMIN , the calculation shutter speed T _VD is changed to the minimum calculation shutter speed T _VDMIN. Since underexposure occurs, the Tv non-consecutive bit is set, and then the EE pulse number PN is set to 0 (S133 to S135, S137, S138 to S14).
0).

When the setting of the number PN of EE pulses is completed, the aperture value for calculation A _VD and the shutter speed T _VD for calculation are converted into the aperture value for transfer A _VT and the shutter speed for transfer T _VT , respectively, and the exposure factor The calculation ends (S141, S142).
By the above processing, a diagram shown by a broken line in FIG. 10 is obtained.

[Second Hyper EE, ES Automatic Exposure Mode] The second hyper EE, ES automatic exposure mode in this embodiment is different from the second hyper EE, ES automatic exposure mode in that when only the change of the non-priority exposure factor results in overexposure or underexposure, priority is given. This is a mode for changing the exposure factor. In the above-described hyper EE / ES automatic exposure mode, the aperture value or the shutter speed that has been set preferentially is not changed even if the subject is too bright or too dark, whereas the second hyper EE / ES in this embodiment is not changed.
The automatic exposure mode is a mode in which the priority exposure factor is changed when overexposure or underexposure occurs only by changing the non-priority exposure factor.

In the second hyper EE / ES automatic exposure mode, when overexposure or underexposure is performed with the shutter speed or aperture value set as a priority, the shutter speed or aperture value set as a priority is set to an appropriate exposure. (See FIGS. 15 and 18). The processing operation of the second hyper EE automatic exposure mode will be described based on the flowchart shown in FIG. 14, and the processing operation of the second hyper ES automatic exposure mode will be described based on the flowchart shown in FIG.

In the second hyper EE automatic exposure mode, first, by operating the Tv electronic dial 17, the set shutter speed T _VT stored in the IPU 43 is read, converted into a calculation shutter speed T _VD , and this value T _VD and The optimum calculation aperture value A _VD is calculated with the calculation exposure value L _VD (S121, S12
2). If the optimum calculation aperture value _AVD is within the aperture capability range, the process directly enters S132 in the hyper ES automatic exposure mode (FIG. 16) (S123, S125, S127).

Aperture value A _VD for optimal calculation because subject is too bright
Is larger than the maximum aperture value A _VDMAX for calculation, the optimum aperture value A _VD for calculation is changed to the maximum aperture value A _VDMAX for calculation, and the process proceeds to S132 (S123 to S125, S127). When the subject is too dark, the optimum aperture value for calculation A _VD is the minimum aperture value for calculation A
_{When the value} is smaller than _VDMIN , the aperture value A for optimal calculation
_After changing _VD to the minimum aperture value for calculation A _VDMIN , the _{process proceeds} to S132 (S123, S125 to S127).

When the process enters S132 in the hyper ES automatic exposure mode (aperture priority automatic exposure mode), the calculation shutter speed _TVD is calculated again, and the shutter speed is changed.

By the above processing, the solid line in FIG.
Since the diagrams shown by the one-dot chain line and the two-dot chain line are obtained, the proper exposure range is widened. This also works within a certain range in shutter priority auto exposure mode,
It can be considered as a kind of program automatic exposure mode.

In the second hyper-ES automatic exposure mode, first, by operating the Av electronic dial 19, the set aperture value A _VT stored in the IPU 43 is read and converted into an aperture value A _VD for calculation. An optimal calculation shutter speed T _VD is calculated based on the exposure value L _VD (S151, S
152). If the optimal calculation shutter speed _TVD is within the shutter capability range, the value is held and the process proceeds to S102 of the hyper EE automatic exposure mode (FIG. 13) (S1).
53, S155, S157).

If the subject is too bright and the optimal calculation shutter speed T _VD is _higher than the maximum calculation shutter speed T _VDMAX , the optimal calculation shutter speed T _VD is changed to the maximum calculation shutter speed T _VDMAX before the shutter operation. Enter the priority automatic exposure mode S102 (S153 to S155,
S157).

If the subject is too dark and the optimal calculation shutter speed T _VD is smaller than the minimum calculation shutter speed T _{VD MIN} , the optimum calculation shutter speed T _VD is changed to the minimum calculation shutter speed T _VDMIN , and then S102 is performed. Enter (S1
53, S155 to S157). In S102, the aperture value for calculation A _VD is calculated again, and the aperture value is changed (S103 to S112).

With the above processing, the solid line in FIG.
The diagrams shown by the one-dot chain line and the two-dot chain line are obtained, and the proper exposure range is widened. It should be noted that this can be considered as a kind of programmed automatic exposure mode that functions in the aperture priority automatic exposure mode within a certain range.

Although the first and second hyper EE and hyper ES automatic exposure modes described above have been described as being separate from each other, they can be implemented by the same camera. That is, E ² included in IPU 43
Two bits in the exposure mode data of the PROM 43c may be associated with the first / second method in the hyper EE or hyper ES automatic exposure mode. These data are transferred to the CPU-
The data is transferred to the CPU 41 by IPU communication, and hyper EE,
If the above two bits are determined after the determination of the hyper ES, it is possible to switch between the first or second hyper EE and the hyper ES automatic exposure mode.

[LA Hyper Manual Exposure Mode]
The hyper manual exposure mode of the body set, in which both the shutter speed and the aperture value can be manually set by operating the camera body 11, will be described with reference to the flowchart shown in FIG.

The hyper manual exposure mode of the lens auto in the present embodiment is a manual exposure mode in which the photographer normally sets an exposure factor by operating the electronic dials 17 and 19, but when the clear button 23 is turned on. When the switch is on, an appropriate exposure factor is calculated according to the subject brightness Bv by an algorithm equivalent to the program exposure mode. When the switch is turned off, the calculated exposure factor is replaced with a manually set exposure factor. is there.

In the LA hyper manual exposure mode, the TV electronic dial 17 and the Av electronic dial 19
With this operation, both the shutter speed Tv and the aperture value Av can be set. Further, by turning on the clear button 23, the same effect as when switching to the program automatic exposure mode can be obtained. The set shutter speed Tv and aperture value Av are stored in the RAM 43 of the IPU 43.
The memory is stored at a predetermined address b, and is further displayed on the LCD panel 69 and the finder display unit 71 provided in the finder visual field.

In the LA hyper manual exposure mode, when the clear button 23 is turned on,
The calculation shutter speed T _VD and the calculation aperture value A _VD are calculated in the program exposure mode, and the process proceeds to S167 (S1).
64). On the other hand, if the clear button 23 has not been turned on, the set aperture value A _VT and the set shutter speed T _VT sent from the IPU 43 are converted and set as they are as the aperture value A _VD for computation and the shutter speed T _VD for computation, respectively. Then, the process proceeds to S167 (S161 to S163).

In S167, an exposure value (A _VD + T _VD ) based on the calculation aperture value A _VD equal to the set value and the calculation shutter speed T _VD equal to the set value, and an appropriate calculation exposure value based on the actual photometry. From the value L _VD , the exposure error ΔEv is calculated by the following equation. ΔEv = L _VD − (A _VD + T _VD )

The exposure error ΔEv is within the allowable range (−3/8 <
If ΔEv <+3/8, the fixed-point LED over bit and the under bit are both set, and both the pair of exposure display elements 71a and 71b (see FIG. 42E) of the display unit 71 in the finder are turned on (S168). , S170,
S171).

When the exposure error ΔEv is larger than the allowable value, the exposure display element 71 of the information for displaying the overexposure is displayed.
Only the fixed-point LED over bit for turning on a is set (S168, S169), and when it is smaller than the allowable value, the lower exposure display element 71b for displaying underexposure.
Only the fixed point LED under bit for turning on is set (S168, S170, S172). In this embodiment, the allowable value of the exposure error ΔEv is set to less than ± 3/8 Ev. However, this value can be set arbitrarily, and the values of the over side and the under side may be different. Alternatively, the latitude of the loaded film may be read from the DX code and set as an allowable value.

Then, EE is calculated based on the aperture value for calculation A _VD.
The number of pulses PN is obtained (S173, S174, S17
5) Calculation aperture value A _VD and calculation shutter speed T _VD
Is converted to the transfer aperture value A _VT and the transfer shutter speed T _VT , respectively, and the processing is terminated (S176, S17).
7).

With the above processing, when the clear button 23 is turned on in the hyper manual exposure mode, both the shutter speed Tv and the aperture value Av are set to appropriate values according to the photometry value (subject brightness Bv) in the program exposure mode. Since it is changed, the appropriate exposure value can be manually set quickly with a simple operation. In this embodiment, while the clear button 23 is turned on, the proper exposure factor is continuously calculated.
The configuration may be such that the proper exposure factor is calculated and set in the RAM 41b only when 3 is switched from off to on.
In this case, S161 may be changed to a process of checking whether the clear button 23 has changed from off to on.

[Second LA Hyper Manual Exposure Mode] In the above-described processing, when the clear button 23 is turned on, the Tv and Av values measured in the program automatic exposure mode are changed. (Shutter speed Tv or aperture value Av) may be changed to an appropriate value. Further, since the exposure mode is the manual exposure mode, it is possible to set the values to the Tv and Av series even if the exposure value is not the proper exposure value Ev. Here, the values of the Tv and Av series are CP
Apex value step set by U41 operation
Since the (second precision increment) is smaller than the manually settable apex value step (first precision increment) , the calculated apex value is rounded to a manually settable apex value step. .

The E ² PROM 43 determines whether to set an appropriate value or a series value.
It is determined by one bit in the hyper manual select flag of c. In the present embodiment, as shown in FIG.
If the bit is “0”, the sequence value is set, and if the bit is “1”, the appropriate value is set. The type of the automatic exposure mode is determined by the first and second bits in the flag. This bit may be set at the time of shipment from the camera or may be set or changed by the photographer.

FIG. 24 is a flowchart showing a combination of an example in which at least one of the above-mentioned exposure factors is changed to an appropriate value using the data of the hyper manual select flag of the E ² PROM 43c in the IPU 43 and an example of an appropriate / sequence change. Was. The data in the E ² PROM 43 c is stored in the RAM 43 b of the IPU 43 during operation, but the same data is stored in the CPU 4 through CPU-IPU communication.
1 is also stored in the RAM 41b.

The on / off state of the clear button 23 is checked, and if it is on, the flow proceeds to S603 (S60).
1). In S603, Tv, Av at the time of LA hyper manual by the hyper manual select flag data.
Examine the change mode of. Here, bits 1 and 2 of the hyper manual select flag data correspond. If the value of these two bits is "0", the process proceeds to program automatic exposure mode processing (S605), if "1", the process proceeds to LA aperture priority automatic exposure mode processing (S607), and if "2", the LA shutter priority automatic exposure mode. Proceeding to the processing (S609), if "3", the exposure mode processing is not performed and S61 is performed.
Proceed to 1. By these processes, the calculation shutter speed T
_VD , aperture value for calculation A _VD and shutter speed for display T _VT ,
The display aperture value _AVT is stored in the RAM 41b in the CPU 41.

Next, select flag data sequence / property
The bit is checked (S611). If the value is "0", the process proceeds to the series value setting process (S613). If the value is "1", the process proceeds to the Manual-1 subroutine as it is a proper value process. Since the appropriate value processing is the same as in the first embodiment, the processing in the case of a series value will be described. S605, S60
7, that the processing of AVTD and TVTD is performed after the processing of S609 means that the proper values for calculation T _VD , A
_{Although the VD} is obtained, the values of the display shutter speed T _VT and the aperture value A _VT calculated based on these values (S60
5, the shutter speed T _VD for calculation (S613) and the aperture value A _VD for calculation (S61) based on the last TVDT and AVDT processing in the subroutines of S607 and S609.
This corresponds to recalculating 5). By this processing, the calculation appropriate shutter speed T _VD and aperture value A _VD once obtained are converted into the calculation sequence shutter speed T _VD and aperture value A _VD . The processing after S167 is exactly the same as in the first embodiment.

According to the above second embodiment, the following 6
It is possible to select the type of LA hyper manual exposure mode. Exposure control based on the proper shutter speed Tv and aperture value Av obtained in the program automatic exposure mode by pressing the clear button 23 (first embodiment). By pressing the clear button 23, a series (rounding) shutter speed T obtained in the program automatic exposure mode
Exposure control by v and aperture value Av. Exposure control by the appropriate aperture value Av obtained in the shutter speed priority automatic exposure mode by pressing the clear button 23. By pressing the clear button 23, a series (rounded) aperture value A obtained in the shutter speed priority automatic exposure mode
Exposure control by v. Exposure control by the appropriate shutter speed Tv obtained in the aperture priority automatic exposure mode by pressing the clear button 23. By pressing the clear button 23, a series (rounding) shutter speed Tv obtained in the aperture priority automatic exposure mode
Exposure control.

[LM Hyper Manual Exposure Mode]
Next, a lens manual hyper manual exposure mode in which the shutter speed is set by the camera body 11 and the aperture value is set by the photographing lens 65 will be described with reference to the flowchart shown in FIG.

In the LM hyper manual exposure mode of this embodiment, the shutter speed Tv is normally set manually by operating the Tv electronic dial 17, but the shutter speed Tv is operated by turning on the clear button 23 (clear switch SWCL). Is automatically set (changed) to an appropriate value according to the subject brightness Bv.

If the clear button 23 has not been turned on, the transfer shutter speed T _VT (a value of a 1/2 Ev step) sent from the IPU 43 is directly converted into the calculation shutter speed T _VD , and the flow advances to S185. (S181,
S182).

On the other hand, when the clear button 23 is turned on, based on the aperture value Av set by the aperture ring of the photographing lens 65 input via the aperture volume 53 and the A / D converter 51, described later. The shutter speed Tv is calculated in the lens manual aperture priority (ES) automatic exposure mode (S181, S183). Then, similarly to the case of the LA hyper manual exposure mode, it is checked whether the sequence value is set or the appropriate value is set (S18).
4). Then, if the sequence value is set, the process proceeds to S182, and if the appropriate value is set, the process proceeds to S185. The reason why the TVDT processing (S182) is performed in the case of setting the series value is the same as in the case of the LA hyper manual exposure mode.

In step S185, the aperture value for calculation A _VVRD (AVVRD) is calculated based on the AD conversion value AVA / D of the aperture value Av set by the aperture ring of the photographing lens 65 and the adjustment value A _VADJ (AVADJ) unique to the camera body 11. ) Is calculated. Then, based on these values, the exposure error ΔEv is calculated by the equation: ΔEv = L _VD −T _VD −A _VVRD −MND (S186).

If the exposure error ΔEv is within the allowable range, the fixed-point LED over bit and the under-bit are set. If the exposure error ΔEv is larger than the allowable value, the fixed-point LED over bit is set.
Is set (S187 to S191). And the number of EE pulses P
Set to the maximum value N (255 in the present embodiment), and terminates the exposure factor setting process by converting the operation for shutter speed T _VD to the transfer the shutter speed T _VT (S192, S193). The reason why the EE pulse number PN is set to the maximum value is that the aperture mechanism of the camera body 11 is completely driven to the aperture stop position so that the aperture is set to the aperture value set by the aperture ring of the photographing lens 65 without fail. That's why.

As described above, in the LM hyper manual exposure mode, when the clear button 23 is turned on, the shutter speed Tv is set to an appropriate value obtained in the aperture-priority automatic exposure mode or a value of a rounded series. , You can quickly set the appropriate exposure manually.

[LM Aperture Priority Automatic Exposure Mode] Next, the aperture priority (ES) exposure mode of the lens manual for setting the aperture with the aperture ring of the photographing lens 65 will be described with reference to the flowchart shown in FIG.

Here, the calculation aperture value A _VVRD is calculated from the AD conversion value AVA / D value of the aperture value Av set by the aperture ring of the photographing lens 65 and the adjustment value A _VADJ unique to the camera body 11. (S201). Further, the calculation shutter speed T _VD is calculated by the equation T _VD = L _VD −A _VVRD −MND based on these values (S20).
2). Then, if the calculation shutter speed _TVD is within the shutter capability range, the EE pulse number PN is set to the maximum value as it is (S203, S205, S208). If the calculation shutter speed T _VD is higher than the calculation maximum shutter speed T _VMAX , change it to this (S203, S20
4) _If it is smaller than the minimum shutter speed for calculation T _VMIN , change to this (S203, S205, S20)
6), the number of EE pulses PN after setting Ev
Is set to the maximum value (S207 to S208).

Finally, the calculation shutter speed T _{VD is set} to the IPU value.
The processing is terminated after conversion to the transfer shutter speed T _VT to be transferred to S 43 (S 209).

[LA, LM Valve Exposure Mode] Next, the valve exposure mode will be described with reference to the flowcharts shown in FIGS. In the case of the lens auto valve exposure mode, first, the Av e-dial 19
The transfer aperture A _VT that is set into a calculating diaphragm value A _VD read by CPU-IPU communication by (S2
11). The EE corresponding to the aperture value for calculation A _VD
The number of pulses PN is calculated and set (S212, S21
3) The fixed point LED under bit and over bit are reset, and the aperture value for calculation A _VD is converted again to the aperture value for transfer A _VT , and the process is terminated (S215, S216). When the calculation aperture value A _VD is equal to the calculation minimum aperture value A _VDMIN , the EE pulse number PN is set to 0 (S2).
12, S214).

In the case of the lens manual valve exposure mode, as shown in FIG. 23, the EE pulse number PN is set to the maximum value, and the aperture can be narrowed down to the aperture value set by the aperture ring of the photographing lens. Reset the fixed point LED under bit and over bit and end the process.

[IPU Main Routine]
Next, the process of the IPU 43 will be described. First, the main operation of the IPU 43 will be described with reference to the flowchart shown in FIG. Note that the manually set aperture value Av and shutter speed Tv, the display aperture value Av and shutter speed Tv, the selected exposure mode, the communication with the CPU 41, and the lens communication are sent to the internal RAM 43b of the IPU 43. Shooting information such as the transfer aperture value A _VT , the transfer shutter speed T _VT , the maximum F number FNo, and the minimum number FNo are stored in different addresses.

The IPU 43 always operates while the battery of the camera is inserted, and executes the IPU-MAIN of FIG. 26 when the battery is turned on. First, IPU43
Initializes the port and the RAM 43b and initializes various modes (S220 to S222).
Next, an initial mode of the exposure mode is set. This is
The mode is determined based on the state of the port PL0 of the PU 43. In the case of the lens auto, the hyper program exposure mode is set, and in the case of the lens manual, the aperture priority automatic exposure mode is set.

Next, the intermittent processing by the 32 ms timer is repeated (S223 to S229-2). The IPU 43 performs the following processing in the intermittent processing. When the 32 ms timer expires, the switch input, that is, the levels of the switch input ports PC0 to PB5 are sequentially input,
When the switch falls to the “L” level (when the switch is on), input processing and lens type determination corresponding to the switch are executed, and information such as the mode and lens type set by these switches is stored in the RAM 43b. Writing and lens data are input to the IPU 43 by lens communication (S223 to S225). If the time is not up, the process jumps to S228 (S223,
S228).

Next, it is checked whether or not the main switch SWMAIN is turned on.
Clear the -Tv flag and the Hyp-Av flag,
Turn off the power hold (turn off the main power supply of CPU41)
) To clear the ML mode flag (hold bit) and return to S223 (S226, S226-2, S22)
9-2). If the main switch SWMAIN is on,
It is checked whether or not the photometric switch SWS is turned on. If it is turned on, it is considered that the photographing operation has started or is in operation.
28 (S226, S227-1, S227-
2. If the photometric switch SWS is not turned on, the photometric timer start and the power hold on process are skipped and the process proceeds to S228 (S226, S22).
7-1, S228).

In step S228, the aperture value (F), shutter speed (S ^-1 ) information and the like used for the selected photographing mode photographing are displayed on the LCD panel 69 and in the viewfinder display unit 7.
1 is displayed. Then, it is checked whether or not the time of the photometry timer has expired. If the time has expired, the power hold is turned off. If the time has not expired, the process returns to S223 (S229-1, S229-).
2, S223).

During the intermittent timer processing, C
When a communication interrupt is received from the PU 41, the communication processing is executed, and when the electronic dials 17 and 19 are rotated, the electronic dial setting processing is executed. The main switch S
These interrupts do not occur when WMAIN is turned off.

[Process for Communication with Lens] The subroutine for communication with the lens CPU in S225 will be described with reference to FIG. First, IP
U43 sets the pin CONT to the “L” level (logic “0”)
Mount pin information (open F number Fmi
n, maximum F-number Fmax and auto / manual (A / M) information). (S31, S32). Note that a prior application filed by the present applicant (JP-A-63-18471)
No. 9), the pin RES / Fmin3, S
I / Fmin2, Fmax1, Fmax2 and ^- SC
Transistors are connected to the pins of the taking lens that come into contact with K ⁻ / Fmin1, and ON / O of each transistor is
The combination of levels changed by the FF forms the 3-bit open F-number Fmin and the 2-bit maximum F-number Fmax information. Further, an A / M switch SWA / M is connected to the pin A / M.
1-bit aperture auto / manual information is formed by ON / OFF of the A / M switch SWA / M.

The CPU 41 sets the pin CONT to logic “1”.
(“H” level), and depending on whether the level of the pin CONT is “1”, whether the auto AF lens KAF is mounted or not, and whether the other lens is Is determined (S33,
S34). The lenses that can be identified in this embodiment are a manual lens K without a mount pin and an auto lens KA with a mount pin but no lens ROM.
A equipped with a camera, mount pins and lens ROM
There are three types of F lens KAF.

If the pin CONT is “1”, the photographing lens 6
The lens communication is executed between the camera and the camera 5 and lens data is input (S34, S35). And mount pin Fmax1
If all the levels of Fmin1 to Fmin1 to Fmin3 are "1" and the lens type bit of 5 bits is "1 1 1 1 1", it is considered that the lens ROM has failed. Set and return (S3
6, S37, S38). Mounting pins Fmax1 to Fmax2,
Even if one of the levels of Fmin1 to Fmin3 is “0”, and the lens type input through the lens communication is the auto AF lens K
If it is AF, the auto AF lens KAFLens bit is set and the process returns (S36, S39, S40).

If none of the above, it is checked whether the lens is automatic or the lens is manual. If the lens is automatic, the automatic lens KALens bit is set and the process returns (S34 to S36, S39, S41, S42).

A lens manual and a pin Fmax
If the levels of 1 and 2 are “1 1” and the levels of the pins Fmin 1 to Fmin 3 are “1 1 1”, since no photographing lens is mounted, the no lens NoLens bit is set and the process returns (S
43, S44).

A lens manual and a pin Fmax
If the levels of 1 and 2 are “0 0” and the levels of the pins Fmin 1 to Fmin 3 are “0 0 0”, it is a manual lens K, so the manual lens KLens bit is set and the process returns (S
45, S46).

If the pins Fmax1, max2 and the pins Fmin1 to Fmin3 are not all "1" or "0", the auto lens is set to the lens manual and the auto lens KAlens bit is set, and the process returns (S41, S41).
43, S45, S42).

By the above processing, the type of the lens, various kinds of lens information, and the distinction between the lens auto / manual are determined by the IPU.
The data is set in the memory 43 and further transferred to the CPU 41.

FIG. 28 shows a subroutine of the switch input process in S224. Drive switch SW
When any of DRIVE, ISO sensitivity setting switch SWISO, exposure compensation switch SW ± EF and exposure mode switch SWMODE is turned on, the corresponding subroutine (only mode shift and MODE IN subroutines are shown)
The processing is executed in the processing (S231 to S233).
When these input processes are completed, the mode shift process, the mode IN process, and the memory lock process are executed, and the process returns (S234 to S236). The mode shift subroutine, MODE IN subroutine, and memory lock subroutine will be described later.

[Electronic Dial Processing] FIGS.
The flowchart of the subroutine regarding the electronic dial processing of S227 and S228 is shown. This subroutine is interrupted when the Tv, Av electronic dials 17, 19 are rotated in either direction and any of the ports PA0, A1, A2, A3 becomes "0".
, Av dial change bit (S271, S28)
1).

When the Tv electronic dial 17 is rotated, a process for detecting in which direction the Tv electronic dial 17 is rotated is executed (S272). That is, when the Tv electronic dial 17 is rotated clockwise, first, the port PA0 is set to "0".
(The port PA1 remains "1".) The right rotation bit is set. When the port PA1 is rotated left, first the port PA1 becomes "0".
(The port PA0 remains "1".) The right rotation bit is reset and the process returns (S273, S27).
4).

Similarly, when the Av electronic dial 19 is rotated, the Av dial change bit is set, and the right rotation bit is set and reset (S282 to S284).
These electronic dial change bits and right rotation bits are used in the subsequent Av and Tv electronic dial set processing, exposure mode selection processing, and the like.

[Tv, Av Electronic Dial Set]
The processing of the IPU 43 when the electronic dials 17 and 19 are rotated when a specific exposure mode is selected will be described with reference to subroutines shown in FIGS. The specific exposure mode in this embodiment is a program, limited program, hyper program, EE automatic, lens automatic ES automatic and manual exposure mode. Further, in the present embodiment, the shutter capacity of the camera body is 30 to 1/8000 second (T
v = −5 Tv to +13 Tv), and the aperture capability is determined by the open F-number Fmin read from the taking lens.
(= Avmin) to the maximum F number Fmax (= Avmax). For simplicity of description, it is assumed that the manual setting accuracy is set to 1/2 Ev for both Tv and Av.

In the TV dial set, first, TV
The dial change bit is checked, and if "0", the process returns as it is. If "1", it is checked whether the right rotation bit is set (S401, S40).
2). If the right rotation bit is set (Tv electronic dial 19 is rotated right), the shutter speed Tv is added in units of 1/2 Tv until the maximum shutter speed Tvmax is reached (S4).
02, S403, and S404). If the right rotation bit is reset (Tv electronic dial 17 is rotated left), the shutter speed Tv is reduced by half until the minimum shutter speed Tvmin is reached.
Tv is subtracted (S402, S405, S40)
6). Then, the Tv dial change bit is cleared and T
v Reset right rotation bit and return (S40
7).

On the other hand, in the Av dial check,
Av If the electronic dial 19 is rotated right, the aperture value A
v is added in units of 1/2 Av (until the maximum aperture value becomes Avmax) (S411 to S414). Then, the Av dial change bit is cleared, the Av right rotation bit is reset, and the process returns (S418). On the other hand, if the Av electronic dial 19 is rotated counterclockwise, the aperture value Av is reduced to 1/2 A
Subtract in v units (until the minimum aperture value becomes Avmin) (S
411, S412, S415, S416). And A
v Clear the dial change bit, reset the Av rotation bit, and return (S418).

[Selection of Exposure Mode] Next, the operation of selecting the exposure mode will be described with reference to the subroutine shown in FIG. 33 and FIGS. 34A and 34B. Note that this exposure mode change operation is executed by the IPU 43 based on a program stored in the internal ROM 43a of the IPU 43.

[Mode Shift Process] The mode shift process is a process for changing the IPU mode relating to the exposure mode to the CPU mode. That is, this is a process for changing the IPU mode to the CPU mode when the CPU 41 has the IPU mode number used in the IPU 43 and the CPU mode number used in the CPU 41. Table 4 shows the relationship between the IPU mode number and the CPU mode number.

[Table 4]

The mode shift processing will be described with reference to the flowchart shown in FIG. IPU43
Checks whether the lens aperture mode is auto or manual, and if manual, sets the CPU mode to the lens manual mode and returns (S62)
1, S623). With lens auto and Hyper Tv
When both the flag and the hyper Av flag are cleared, the CPU mode is added to the lens auto mode by adding 8, and the process returns. When the hyper Tv flag is set, the CPU mode is set to "8" and the routine returns (S621, S625, S62).
7). If the hyper Av flag is set, the CPU mode is set to "7" and the routine returns (S621, S625, S629, S631).

[Mode-in processing] Mode-in processing (S2
35) is when the exposure mode / drive lever 29 is slid to the MODE side in the intermittent processing of the 32 ms timer (when the exposure mode switch SWMODE is turned on).
Then, it is processed as one subroutine in the SW-IN process (S224). And changing the exposure mode
The exposure mode / operation is performed by operating the Tv electronic dial 17 in a state where the drive lever 29 is slid to the MODE side. The exposure mode corresponding to the exposure mode number is
This is as shown in Table 4 above. This mode-in processing will be described in more detail with reference to the flowcharts shown in FIGS. 34A and 34B. Note that Hyper EE and Hyper ES do not have an independent mode number, but the same exposure mode number (14) as the Hyper program,
, Hyp-Av flags.

The photographing lens in this embodiment has an auto / manual changeover switch SWA / M by rotating the aperture ring of the lens. When the auto / manual changeover switch SWA / M is set to manual, the aperture is set to the lens. Set on the side. Therefore, if it is determined in S241 that the lens is manual, the flow advances to S242 to set the exposure mode to the LM aperture priority (ES) automatic exposure mode (exposure mode).
NO.2), LM hyper manual exposure mode (exposure mode NO.1), LM bulb exposure mode (exposure mode NO.1)
0) is selected from the three types. The initial state is LM
This is the aperture priority automatic exposure mode (exposure mode No. 2).

In S242, it is checked whether or not the mode switch SWMODE is turned on.
Check whether the electronic dial 17 has been rotated (whether the Tv dial change bit is set) and
If it has not changed, reset the Tv dial change bit and proceed to the check subroutine. If it has changed, whether it is clockwise rotation (whether the clockwise rotation bit is set)
Is checked (S243, S244, S251).

When the Tv electronic dial 17 is rotated to the left (when the right rotation bit is “0”), the exposure mode is set to L.
M aperture priority → LM hyper manual → LM valve → L
The circulation is changed one by one in the descending order of M aperture priority, the Tv dial change bit is reset, and then the routine jumps to the check subroutine (S241 to S247, S251).

When the Tv electronic dial 17 is rotated right (when the right rotation bit is "1"), the exposure mode is circulated one by one in the ascending order reverse to the above, and the Tv dial change bit is reset. To the check subroutine (S244, S248 to S251).

When the exposure mode switch SWMODE is turned off or the Tv electronic dial 17 is not operated (when the Tv dial change bit is "0"),
Without changing the exposure mode, reset the Tv dial change bit and jump to the check subroutine (S242, S
243, S251).

"Check subroutine" In the check subroutine, as shown in FIG. 34, when any of the NOLensbit, the hyper Av flag, and the hyper Tv flag is set, the mode display processing is performed after the hyper Av flag and the hyper Tv flag are lowered. And return. What are the Hyper Tv flag and Hyper Av flag?
It is an alternative to the AE mode. That is, instead of including the hyper EE and the hyper ES in the AE mode type, the method is identified by the hyper Tv flag and the hyper Av flag.

Therefore, in the case of the hyper EE, the hyper program (NO. 14) in the AE mode type and the hyper Tv flag are set, and in the case of the hyper ES, the AE mode is set.
The hyper program (NO. 14) in the mode type and the hyper Av flag are set. Conversely, hyper E
E. To return from the hyper ES mode to the hyper program mode, the hyper Av flag or the hyper Tv flag may be reset. This check subroutine always resets the hyper-Av flag and the hyper-Tv flag in the case of a lens manual. Therefore, when the auto / manual switch SWA / M is switched from manual to auto, or when the taking lens is once removed. When re-mounted, the exposure mode is initialized to the hyper-program exposure mode.

When the photographing lens is an auto lens and the auto / manual switch SWA / M is set to auto, the exposure mode switch SW
Under the condition that MODE is turned on and the Tv electronic dial 17 is rotated counterclockwise, the exposure mode is changed from program → hyper program → limited program →... → LA valve →
The program is cyclically changed one by one in the order of the program →, and display processing is performed (S241, S251 to S257, S264). When the Tv electronic dial 17 is rotated clockwise, the exposure mode is changed one by one in the ascending order reverse to the above, and display processing is performed (S258 to S260, S264).

On the other hand, when either the exposure mode switch SWMODE or the Tv electronic dial 17 is turned off in the lens auto mode, the above-described exposure mode selection processing is not performed (S241, S251 to S253, S261). If the clear button 23 has not been turned on (the clear switch SWCL has not been turned on), the current exposure mode is displayed (S261,
S264).

When the clear button 23 is turned on, the exposure mode is initialized to the hyper program mode when the exposure mode is the hyper EE or hyper ES, and the mode is maintained as it is in the other exposure modes.
That is, in the hyper EE or hyper ES automatic exposure mode, since the hyper Tv flag or the hyper Av flag is set, these are reset (S
261, S263). Thus, when the photographer presses the clear button 23, the mode returns to the hyper program exposure mode in the hyper EE or hyper ES exposure mode.

In the above exposure mode selection processing, it is not possible to directly select the hyper EE or hyper ES automatic exposure mode. The selection of the hyper EE or hyper ES automatic exposure mode is performed by operating the electronic dials 17 and 19 in a state where the hyper program exposure mode is selected. That is, if the electronic dials 17 and 19 are rotated while the hyper program is selected, the hyper Av flag or the hyper Tv flag is raised, and the mode can be forcibly changed to the hyper EE or hyper ES automatic exposure mode. When the hyper EE or hyper ES automatic exposure mode is selected, the electronic dial 17 or 19 can be forcibly changed to the hyper ES or hyper EE automatic exposure mode. Further, by turning on the clear button 23, it is possible to forcibly change from the hyper EE or hyper ES automatic exposure mode to the hyper program exposure mode. The above-described forced change display is executed in an exposure mode display process described later.

In the above-described embodiments, a series of numbers are given to the exposure modes in the lens auto mode and the lens manual mode in order to simplify the description and processing. However, actually, in the IPU 43, the exposure mode is stored as separate data for the lens auto mode and for the lens manual mode. Further, a lens auto / manual (A / M), a Hyp-Tv flag and a Hyp-Av flag are assigned to this memory. The contents are shown in FIG.

Here, the aperture auto and manual information (A / M terminal) switched by the aperture ring of the photographing lens are:
For example, when the mode is auto ("0"), the exposure mode is determined by the three bits for the lens auto mode and the Hyp-Tv and Av flags, and when the mode is manual ("1"), the exposure mode is determined by the two bits for the lens manual mode. I do. Then, the CPU 41 sends it to the CPU 41 as 4-bit exposure mode data including the auto and manual exposure modes. The correspondence between the exposure mode (IPU mode) in the IPU and the exposure mode (CPU mode) for the CPU is as shown in Table 4.

[Memory Lock Processing] The memory lock of this embodiment means that the exposure value Ev is locked when the hold button 25 is pressed once, and the exposure value Ev is held when the hold button 25 is pressed twice.
Unlock the lock. That is, the lock and release of the exposure value Ev are repeated each time the hold button 25 is turned on and off. In this memory lock processing, for example, three bits in the memory lock flag data in the RAM 43b are used. As shown in FIG. 38, one bit is the ML mode flag (hold bit), one bit is the current hold switch data, and the other one bit is the old hold switch data. These data are all cleared in the initial state.

Regarding the memory lock processing in S236,
This will be described in more detail with reference to the flowchart shown in FIG. In this process, the ML mode flag is set and reset every time the hold switch 25 is turned on and off. First, the current hold switch data is moved to the old hold switch data, and the hold switch 25 is turned on / off.
The state is entered in the current hold switch data (S641,
S643). That is, if the hold switch 25 is turned on, it is set ("1"), and if it is turned off, it is reset ("0"). Note that the hold switch 25 is a normally-open self-return type, but the processing time of the microcomputer is usually very short. Therefore, while the photographer turns on the hold switch 25, this memory lock processing subroutine is executed a plurality of times. It shall pass.

Next, the state of the current hold switch data is checked (S645). When the hold switch 25 is turned off, it is reset, and the process proceeds to the memory lock display process. When the hold switch 25 is turned on, it is set, so the flow advances to S651 to check the old hold switch data.
When the hold switch 25 is turned on and the process is performed for the first time, or when the hold switch 25 is turned off and the process is performed for the second time or later, the process is reset. Therefore, the process proceeds to S651. Since it is set at the time of the first processing after being turned off, S
Proceed to 649.

In S651, it is checked whether the ML mode flag is set. If the ML mode flag is set, the ML mode flag is cleared. If the ML mode flag is cleared, the ML mode flag is set (S655, S6).
53). When the ML mode flag is set, the currently set exposure value Ev is stored (locked), the power hold flag is set for 5 seconds, and the process proceeds to the ML display process (S655, S657, S659). When the ML mode display flag is cleared, the process directly proceeds to the ML display process (S651, S653).

In S649, it is checked whether the ML mode flag has been set. Hold switch 2
When S5 is on, it is set, so S6
The process proceeds to 59, and when it is turned off, it is cleared and the process directly proceeds to the ML mode display process.

In the ML display process, first, the "*" mark display flag is cleared, and if the ML mode flag is reset, the process returns as it is; if the ML mode flag is set, "*" is displayed.
Return after setting the mark display flag (S6)
63, S665).

[Exposure Mode Display, Mode and Setting Value Change Processing] The display examples of the LCD panel 69 and the finder display unit 71 are shown in FIGS. 41A to 41F and FIG.
A to FIG. 42F and FIGS. 43A to 43C show side by side. FIG. 41A shows an LCD.
All display elements (liquid crystal segments) constituting the display of characters, codes, figures, etc. on the panel 69 and the display unit 71 in the viewfinder are shown. FIG. 41B shows a display mode when the main switch SWMAIN is turned off. In other figures, various display modes of the present embodiment are shown. The relationship between the exposure mode display processing in S264 and the above display will be described with reference to the flowcharts shown in FIGS. 39A to 39D. This processing is performed based on a program stored in the internal ROM 43a of the IPU 43.
This is executed by the PU 43.

When the attached lens is auto, S
Proceeding from S301 to S302, the following display processing is performed. [Hyper-program exposure mode] Although the hyper-program exposure mode is set,
When none 9 is not operated, that is the hyper program exposure mode "H _Y P", the initial value of the shutter speed Tv "Tv 8Ooo" (1/8000 sec), the aperture value Av
The initial value "Av 5.6" (F5.6) and the number of shots "22" (22) are displayed on the LCD panel 69 in the manner shown in FIG. 42B, and the initial values of the shutter speed Tv and the aperture value Av are displayed. In the viewfinder display unit 71
(S302 to S308).

The IPU 43 sets the optimum shutter speed Tv (transfer shutter speed T _VT ) calculated by the CPU 41 in the hyper program exposure subroutine and the optimum aperture value Av (transfer aperture) on condition that the CPU 41 is held in power. The value A _VT ) is read and the RAM 43b is read.
After setting (memory) at a predetermined address, the process returns (S309, S310). The transfer shutter speed T _VT and the aperture value A _VT stored in the RAM 43b are displayed on the LCD panel 69 and the display unit 71 in the finder according to the condition of the power hold.

When the Tv electronic dial 17 has been operated (when the Tv dial change bit is "1"), the hyper Tv flag is set, the hyper Av flag is lowered, and the hyper EE automatic exposure mode is selected (S303). , S31
1). Then, the shutter speed Tv is changed according to the operation of the Tv electronic dial 17, and the changed value is set to a predetermined address of the RAM 43b.
LCD panel 69 and display unit 71 in viewfinder
Is displayed in the manner shown in FIG. 42G (S312, S313). The initial value of the set aperture value Av Av is a value calculated in the hyper program exposure mode or the hyper EE exposure mode. Further, a 3/4 circle surrounding the display “Tv” on the LCD panel 69 and an arrow of a right-angled acute triangle disposed above the circle and an underline of the display “ 4ooo ” of the display unit 71 in the finder are indicated by Tv. The display indicates that the shutter speed Tv can be changed by rotating the electronic dial 17.

Further, provided that the CPU 41 is held in power, the CPU 41 reads the optimal aperture value Av calculated in the hyper EE automatic exposure subroutine, sets it in the RAM 43b (received during communication), and displays it on the LCD panel 69 or the like. And return (S314, S315).

On the other hand, when the Av electronic dial 19 has been operated (when the Av dial change bit is "1"), the hyper Av flag is set, the hyper Tv flag is lowered, and the hyper ES automatic exposure mode is selected ( S30
4, S316). Then, the aperture value Av is changed according to the rotation direction of the Av electronic dial 19, and the changed value is stored in the RAM.
43b, and the fact that the mode is the hyper ES automatic exposure mode and the set aperture value Av are displayed on the LCD panel 69 or the like in FIG.
H (S317, S318). The initial value of the set aperture value Av is a value calculated in the hyper program exposure mode or the hyper EE exposure mode. Also, a 3/4 circle surrounding the display "Av" on the LCD panel 69 and the arrow below it, and the display unit 7 in the viewfinder.
The underline of the display “ 8.o ” of 1 indicates that the aperture value Av can be changed by rotating the Av electronic dial 19.

Further, if the CPU 41 is held in power, the CPU 41 reads the optimal shutter speed Tv calculated by the hyper ES automatic exposure subroutine, sets the value in the RAM 43b, and displays the value on the LCD panel 69 or the like (S319, S320). ).

[0169] The IPU 43 is provided with the electronic dial 17,
Even if none of the buttons 19 is operated, when the hyper EE or ES automatic exposure mode is selected (when the hyper Tv or Av flag is already set), the CPU 41 executes the hyper ES or EE automatic exposure subroutine. The calculated optimal transfer shutter speed T _VT and aperture value A
_{The VT} is set in the RAM 43b and displayed on the LCD panel 69 or the like, but the aperture value Av or the shutter speed Tv is not changed (S303 to S305, S313 to S).
315 or S303-S306, S319-S320).

With the above processing, the photographer can change the mode to the hyper EE automatic exposure mode and select the shutter speed Tv by rotating the Tv electronic dial 17 when the hyper program exposure mode is selected. By rotating the electronic dial 19, it is possible to change to the hyper ES automatic exposure mode and select the aperture value Av. Further, in this embodiment, at the time of switching to another exposure mode, the optimum shutter speed or the optimum aperture value Av calculated in the exposure mode before switching is set.
Is the initial value of the exposure factor that can be manually set in the exposure mode after switching, and the exposure factor is changed by operating the next dial. However, the exposure factor is changed at the same time as the exposure mode is changed. It may be.

Further, when the clear button 23 is turned on, the mode is changed from the hyper EE automatic exposure mode or the hyper ES automatic exposure mode to the hyper program exposure mode.
A change from the E automatic exposure mode to the hyper ES automatic exposure mode, and a change from the hyper ES automatic exposure mode to the hyper EE automatic exposure mode can be performed by rotating the Tv electronic dial 17. As described above, in this embodiment, when the hyper program exposure mode is selected, the operation of the electronic dials 17 and 19 or the clear button 23 can easily obtain the diagrams shown by the solid line, the dashed line, and the broken line in FIG.

As described in the flowcharts of FIGS. 33 and 34, the hyper Tv
, Av flag when the clear button 23 is turned on (S261 to S263), when the hyper program exposure mode is selected in the mode selection processing, when the main switch SWMAIN is turned off, and when the taking lens is removed. , And when the camera is returned to the original state, it is initialized to the hyper-program automatic exposure mode.

[Program Exposure Mode] When the normal program exposure mode is selected, "P" indicating that it is a program is displayed on the LCD panel 69 (S30).
1, S302, S321 to S323). Furthermore, CPU
When the power supply 41 is held, the CPU 41
Reads the communication data corresponding to the optimum shutter speed Tv and the optimum aperture value Av calculated in the program exposure subroutine and sets them in the RAM 43b.
42A and the like (S324, S32
5).

[Limited Program Exposure Mode] In the limited program exposure mode of this embodiment, the shutter speed and the upper and lower limits of the aperture value changing along the program diagram are set by the photographer using the electronic dials 17 and 19 and the hold switch. This is a type of program exposure mode that can be changed by the operation of step S25. When the limited program exposure mode is selected, this fact is displayed on the LCD panel 69 by lighting a 3/4 circle surrounding "Av" and "Tv" in the display mode of FIG. 41C (S461, S46).
2).

When the clear switch SWCL is turned on, the limit shutter speeds T _V1 and T _V2 and the limit aperture values A _V1 and A _V2 are initialized (S463-1, S4).
63-2). Note that the initial values of the limit shutter speed and the limit aperture value in this embodiment in the limited program exposure mode are the lower limit shutter speed T _V1 = T _VMIN = 3.
0 (second), upper limit shutter speed T _V2 = T _VMAX = 1/8000
(Seconds) and lower limit aperture value A _V1 = A _VMIN , upper limit aperture value A _V2
= A _VMAX . These initial values are set when the limited program exposure mode is first selected after the battery is loaded. When the clear switch SWCL is turned off, the limit shutter speeds T _V1 and A _{V2 are set.}
And without _resetting the values of the limit aperture values A _V1 and A _V2 ,
The process proceeds to the check of the photometric switch SWS (S464). That is, the limit value set by the photographer by the following operation is initialized by turning on the clear button 23 (clear switch SWCL).

When the photometric switch SWS is ON or when the power is held even when the photometric switch SWS is OFF, the process proceeds to S485 without doing anything (S464, S4).
65-1). The photometric switch SWS is turned off and the CP
When the power hold of U41 is off, the process of changing the limit value is performed, and the process proceeds to S485 (S46).
5-1, S465-2, S466 to S486). S48
In step 5, it is checked whether or not the CPU 41 is in power hold.
1 reads the optimum shutter speed Tv and the optimum aperture value Av calculated in the limited program exposure mode and
M43b is set and displayed on the LCD panel 69 or the like, and the process returns. If power is not held, the process returns without doing anything (S486).

The limit value change processing after S465-2 is executed as follows. First, TV electronic dial 1
7 is operated, the limit shutter speed Tv is increased / decreased in accordance with the operation status of the Tv electronic dial 17.
It goes down, and the display and the setting process to the RAM 43b are performed (S465-2, S466).

Then, provided that the hold button 25 is turned on, the upper and lower shutter speeds T _V1 ,
Perform a set of T _V2. That is, if the ON operation of the hold button 25 is first or odd number of times, since the ML mode flag is set, and change the Tv value set data to the lower limit shutter speed T _V1 (S467~S47
0), if the second or even-numbered, the process proceeds to S485 to change the Tv value set data to the upper limit shutter speed _{T V2 (S467, S468, S469} , S472). If the hold button 25 is not turned on, nothing is changed (S467, S485).

On the other hand, when the Av electronic dial 19 is turned on, the process of changing the limit aperture value is performed in the same manner as the process of changing the limit shutter speed Tv. That is, the aperture value A is determined according to the rotation direction of the Av electronic dial 19.
The processing of up-down and display of v and the processing of setting it in the RAM 43b are performed (S475, S476). Then, when the hold button 25 is turned on, it is the first or odd-numbered (ML mode flag =
In the case of 1), the Av value set data is changed to the lower limit aperture value A _V1, and in the second or even number (ML mode flag = 0), the Av value set data is changed to the upper limit aperture value A _V2 and the process proceeds to S485. Go on (S478, S479, S48
2).

The above limit shutter speeds T _V1 , T _V2 ,
When the processing for changing the limit aperture values A _V1 and A _V2 is completed, the CPU 41 reads the optimal shutter speed Tv and the optimal aperture value Av calculated in the limited program exposure mode on condition that the CPU 41 is held in power. Is set in the RAM 43b (S485, S4
86). The value set in this way is displayed on the LCD panel 6
9 and so on. In the limited program exposure mode, when the hold switch 25 is turned on,
The shutter speed and aperture value set by the photographer are changed to upper and lower shutter speeds and aperture values.
7. If the processing of S477 is skipped, the electronic dial 17, 1
It is possible to adopt a configuration in which the above-mentioned limit value changes each time the user operates No. 9.

[LA ES automatic exposure mode] Aperture priority (ES) automatic exposure mode (lens auto E
When the (S automatic exposure mode) is selected, the effect is displayed on the LCD panel 69 in the mode shown in FIG. 42D (S
301, S302, S321, S461, S331-S
333). When the Av electronic dial 19 is being rotated, the aperture value Av that has been raised or lowered in accordance with the operation is set as the set aperture value Av in the RAM 43b and displayed on the LCD panel or the like, and the CPU 41 is held in power. Sometimes, the IPU 43 sends out the aperture value _AVT set in the aperture priority automatic exposure mode,
The CPU 41 reads the optimum shutter speed Tv calculated in the LA aperture priority exposure subroutine, sets the read shutter speed Tv in the RAM 43b, and displays it on the LCD panel 69 or the like (S334).
To S338).

[LA EE Automatic Exposure Mode] When the shutter priority (EE) automatic exposure mode is selected, the effect and the initial value (1/8000 second) of the shutter speed Tv are set as follows.
It is displayed on the LCD panel 69 or the like in the mode shown in FIG. 42C (S301, S302, S321, S331, S341).
To S343). When the Tv electronic dial 17 is being rotated, the shutter speed Tv that has been raised or lowered in response to the rotation is set as the set shutter speed Tv in the RAM 43b and displayed on the LCD panel 69 or the like. When the shutter speed _TVT set in the shutter speed priority automatic exposure mode is sent to the CPU 41,
41 reads the optimal transfer aperture value _AVT calculated by the EE automatic exposure subroutine, sets it in the RAM 43b, and
It is displayed on the D panel 69 or the like in the mode shown in FIG. 42C (S3
44-S348).

[Hyper Manual Exposure Mode] In the hyper manual exposure mode of this embodiment, the clear button 2
By the operation of No. 3, the same effect as when the shutter speed Tv and / or the aperture value Av are calculated in the program exposure mode, the EE automatic exposure mode, or the ES automatic exposure mode is obtained.

When the hyper-manual exposure mode of the body set is selected, the fact is indicated on the LCD panel 6.
9 etc. in the manner shown in FIG. 42E (S301, S3
02, S321, S461, S331, S341, S3
79-S351). Then, the Ev check subroutine is executed, and the shutter speed Tv and the aperture value Av, which are increased or decreased according to the rotation operation of the electronic dials 17, 19, are executed.
Is set in the RAM 43b and displayed on the LCD panel 69 or the like (S352).

Further, if the electronic dials 17 and 19 are rotated, the shutter speed Tv or the aperture value Av which is increased or decreased according to the rotation is set, and if the power is held, the CPU 41 is set to the manual exposure mode. The selected shutter speed T _VT and the aperture value A _VT are sent out, and the CPU 41 reads the fixed-point LED bit calculated in the manual exposure subroutine of the body set and sets it in the RAM 43a.
a and 71b are controlled (S353 to S36).
0).

[LA Valve Exposure Mode] When the valve exposure mode of the body set is selected, the fact is displayed on the LCD panel 69 in the manner shown in FIG. 42F (S
301, S302, S321, S461, S331, S
341, S349, S361, S362). And A
v When the electronic dial 19 is being rotated, the aperture value Av that has been raised or lowered in accordance with the rotation is determined by RA.
It is set to M43b and displayed on the LCD panel 69 or the like (S363 to S365).

As described above, the shutter of the body set has priority.
In the aperture priority, manual and bulb exposure modes, the photographer can set the shutter speed Tv and the aperture value Av by rotating the electronic dials 17 and 19. In such a case, the LCD panel 69 displays “Tv” or “Av” and a 3/4 circle and a triangular mark, and the finder display unit 71 displays the shutter speed T.
Since an underline is displayed below the display of v or the aperture value Av, it can be easily visually confirmed that the shutter speed Tv or the aperture value Av can be set by operating the electronic dials 17 and 19. Further, when the hold button 25 is turned on, the display unit 71 in the viewfinder is turned on.
Since the display element 71c (“*”) is turned on, it is possible to surely know that the memory is locked.

(In the case of a lens manual) The exposure mode display in the case of a lens manual in which the aperture is set on the photographic lens side is processed by the IPU 43 as follows.

[LM Hyper Manual Exposure Mode]
When the manual exposure mode is selected, the fact is displayed on the LCD panel 69 in a manner shown in FIG. 43A (S301, S371 to S373). If the Tv electronic dial 17 has been rotated, the shutter speed Tv that has been raised or lowered according to the operation direction is set in the RAM 43b as the set shutter speed Tv, and displayed on the LCD panel 69 or the like (S374 to S376).

Further, if the CPU 41 is held in power, the shutter speed Tv T _VT and the aperture value A _VT selected in the manual exposure mode are sent to the CPU 41, and the fixed point LED bit set by the CPU 41 in the LA manual exposure subroutine is sent to the CPU 41. The reading is set in the RAM 43b, and the lighting of the exposure display elements 71a and 71b is controlled (S377, S378). In FIG. 43A, (a) shows that the exposure is proper, (b) shows that the exposure is over, and (c) shows that the exposure is under.

[LM Manual ES Automatic Exposure Mode]
When the aperture priority (ES) automatic exposure mode of the lens manual is selected, the fact is indicated on the LCD panel 69.
It is displayed in the mode shown in FIG. 43B (S301, S381 to S383).
When the CPU 41 is in the power hold state, the CPU 41 reads the shutter speed T _VT calculated in the ES automatic exposure subroutine of the lens manual and sets the RA.
M43b is set and displayed on the LCD panel 69 or the like, and the process returns (S384 to S385).

[LM Bulb Exposure Mode] When the bulb exposure mode of the lens set is selected, the shutter speed Tv is set on the bulb, and the effect is set on the LCD panel 6.
9 is displayed in the mode shown in FIG. 43C (S301, S371, S3
81, S391, S392).

[0193] [E _V check subroutine] Ev check of this embodiment locks the proper exposure value of the time when the hold switch 25 is turned on, then, when the electronic dial 17 and 19 were operated to rotate the operation A process of raising or lowering the exposure factor (shutter speed or aperture value) of one of which is performed in accordance with the operation, while lowering or increasing the other exposure factor (aperture value or shutter speed) so that the locked exposure value does not change. It is. In the E _V check subroutine in S352, the hold button 25
Is turned on, provided that the e-dial 1
7,19 is each time rotated by one step, to increase or decrease the shutter speed T _V and the aperture value A _V at _{1/2 T V, 1/2 A} V units. The operation of the E _V check subroutine,
This will be described in more detail with reference to FIG.

The hold bit corresponding to the on / off of the switch linked to the hold button 25 is the RA of the IPU 43.
M43b is provided. First, if the hold bit is "0", the hold button 25 is because it is not turned on, the process returns by setting the shutter speed T _V and the diaphragm value A _V is already set (S421,
S437). When the hold bit is "1", that is, when the hold button 25 is turned on, the following processing is performed.

[0195] T _V electronic dial 17 is one step (or more) to the left when it is rotated (Tv change bit is "0"), the shutter speed T _V is T _V = -5 (30
Seconds) or the aperture value A _V is the maximum aperture value A _VMAX
In until subtracts the shutter speed T _V at 1/2 T _V units, and adds the aperture A _V in 1 / 2A _V units (S42
2 to S427). When the _AV electronic dial 19 is rotated rightward, the same processing as described above is performed (S42).
2, S428, S429, S424-S427).

[0196] When T _V electronic dial 17 has been rotated to the right direction, the shutter speed T _V is T _V = 13 (1/800
0 seconds) or the aperture value A _V is the minimum aperture value A
Until _VMIN, by adding the shutter speed T _V at 1/2 T _V units, and subtracts the aperture A _V at 1/2 A _V units (S4
22, S423, S430 to S433). Even when A _V electronic dial 19 has been rotated to the left, the same subtraction processing as described above (S422, S428~S43
3). Then, the shutter speed T _V and the aperture value A _V thus added and subtracted are set in the RAM 43b, and the T _V and A _V dial change bits are reset, respectively, and the process returns (S434 to S437).

According to the above-described processing, by manually setting the appropriate shutter speed T _V and the aperture value A _V and then turning on the hold button 25 once, any one of the
By operating the electronic dials 17 and 19, the exposure value E _V
The keeping constant, the shutter speed T _V and the diaphragm value A
_V can be changed simultaneously. For example, in the hyper manual mode, it is assumed that the shutter speed is 1/125 second and the aperture F8.0 is an appropriate exposure value. When the hold button 25 is turned on in this state, the memory is locked first. Next, for example, by rotating the Tv electronic dial 17 in two steps, the shutter speed is changed to 1/60 second and the aperture is changed to F11 while the exposure value is fixed. This is clearly different from the normal hyper-manual exposure mode in which, when the Tv dial is operated, only the value of the shutter speed changes and the exposure level changes. The release of this mode is performed by turning on the hold button 25 once more.

[Second Exposure Mode Display Process] Next, the second exposure mode display operation will be described with reference to FIG. The difference from the first exposure mode display operation is that the electronic dials 17, 1 and
The exposure mode does not change unless the user rotates the camera 9 more than two steps.

[0199] When the lens auto Hyper program is selected, the hyper program when none of the electronic dial 17 and 19 is not operated to rotate, and Hyper-T _V, none of the A _V flag is off since exposure mode, set the hyper program exposure mode by clearing the hyper T _V flag and the hyper a _V flag, the display of the LCD panel 69 and the viewfinder display unit 71, to the embodiment shown in FIG. 42B (S501
To S508). Then, on condition that the CPU 41 is held in power, the transfer calculation shutter speed T _VT and the transfer aperture value A _VT calculated by the CPU 41 are input, and R
It sets to AM43b and returns (S509, S510).

[0200] When the hyper EE automatic exposure mode is selected, the process proceeds from S505 so hyper T _V flag is set in S514, S311 in S514～S518 ~
The same processing as in S315 is performed. On the other hand, since it is set Hyper A _V flag when the hyper-ES automatic exposure mode is selected, the process proceeds from S506 to S524, S524～
In S528, the same processing as in S316 to S320 is performed.

[0201] When T _V electronic dial 17 or A _V electronic dial 19, is rotated operated, i.e. when T _V change bit or A _V change bit is "1", T _V dial check, A _V dial check subroutine Perform processing. T _V, A _V dial check subroutine is processing T _V, is A _V electronic dial 17 and 19 does not change the exposure mode and does not rotate two steps or more in the same direction.

[0202] When T _V electronic dial 17 or A _V electronic dial 19 is rotated one step, or when rotated one step in the opposite direction after rotating by one step, the process proceeds to S505 (S503, S511, S505, or S503,
S504, S521, S505).

[0203] When T _V electronic dial 17 is rotated two steps in the same direction, the process proceeds from S511 to S512. Since still hyper EE automatic exposure mode is not selected when the hyper T _V flag is down, to allow only the changes to the hyper-EE automatic exposure mode, shutter speed T
Advance to clear the T _V dial change flag in order to disable the change of _V in S514 (S512, S513, S514) . Already hyper-E when the hyper-T _V flag is set
Since E automatic exposure mode is selected, the process directly proceeds to S514 to permit the change of the shutter speed T _V (S512,
S514).

[0204] On the other hand, A _V electronic dial 19 is 2 in the same direction
After rotating by the step, the process proceeds from S521 to S522. here,
When the hyper _AV flag is down, the hyper ES automatic exposure mode has not been selected yet, so that only the change to the hyper ES automatic exposure mode is possible, and the aperture value A
The process proceeds to S524 to clear the A _V dial change flag in order to disable the change of _{V (S521, S522, S523,} S52
Four). When the hyper A _V flag is set, the hyper ES automatic exposure mode has already been selected, and the process directly proceeds to S524 to enable the aperture value A _V to be changed (S5).
21, S522, S524).

[0205] S511, S521 of T _V, the A _V dialing check subroutine, with reference to FIGS. 45 and 46 will be described in more detail. In the T _V dial check subroutine, first of all T _V dummy flag is to check whether the stand (S551). Since the first time, it does not stand, make a T _V dummy flag, and returns to S505 to put the current T _V dial direction flag in the old T _V dial direction flag (S552). At the time of the second time, when the direction of rotation of the last time (the first time) T _V electronic dial 17 of the same, the current, old T _V
Since the contents of the dial direction flag is equal sets a T _V dial dummy flag, the process proceeds to S512 to lower the A _V dial dummy flag (S553, S555). On the other hand, at the second time,
When the direction of rotation of the T _V electronic dial 17 is different between when the first time, the current, the contents of the old T _V dial direction flag is different, T _V dial down the dummy flag, the current T _V dial direction flag the old T _V The process goes to S505 after setting the dial direction flag (S551, S553, S554).

[0206] In the A _V dial check subroutine,
First A _V dummy flag is to check whether the stand (S561). Since the first time, it does not stand, made a A _V dummy flag, and returns to S505 to put the current A _V dial direction flag in the old A _V dial direction flag (S562). When the second time, and when the rotational direction when the first and A _V electronic dial 17 are the same, current, making a A _V dial dummy flag the contents of the old A _V dial direction flag is equal, T _V dial dummy After lowering the flag, proceed to S524 (S563, S565). On the other hand, when the second process, when it is different from the rotational direction of A _V electronic dial 17 in the case of first time, now, the contents of the old A _V dial direction flag are different, the A _V dial dummy flag down, and the process proceeds to S505 to put the current a _V dial direction flag in the old a _V dial direction flag (S561, S563, S564).

As described above, according to the second display subroutine, the exposure mode does not change unless the electronic dials 17 and 19 are rotated by two or more steps. On the contrary, the exposure mode does not change. The electronic dials 17, 19
In the case where is continuously rotated in a short time, a configuration may be adopted in which the mode is not forcibly changed.

As described above, in this embodiment, when the hyper program exposure mode is selected, the electronic dial 1
The shutter speed T _V or the aperture value A _V corresponding to the respective rotation operation directions is changed up or down only by rotating the rotation of the shutters 7 and 19, or the shutter speed priority automatic exposure mode or the aperture priority automatic exposure mode is changed. Can be. After changing to the automatic exposure mode, the e-dial 1
Since the shutter speed or aperture value can be changed by the operations of steps 7 and 19, when the photographer's intention cannot be sufficiently expressed in the program exposure mode, the automatic exposure mode is changed to easily express the photographer's intention more easily. be able to.

Further, if the clear button 23 is turned on after the forced change to the automatic exposure mode, the display returns to the initial hyper program exposure mode. This is convenient when it is desired to temporarily select the automatic exposure mode in which the exposure factor is prioritized. .

In the present embodiment, two automatic exposure modes are provided, a normal program exposure mode and a hyper program exposure mode in which the exposure factor priority automatic exposure mode can be changed by operating the electronic dials 17 and 19 alone. ,
The present invention may be configured to provide only the hyper-program exposure mode, or may be configured to provide more types of program exposure modes.

As described above, in this embodiment, when the electronic dials 17 and 19 are operated in the hyper program exposure mode, one of the shutter speed and the aperture value which can be manually set is set in the program exposure mode at the time of operation. The shutter speed or aperture-priority automatic exposure mode is changed to the shutter speed or aperture priority automatic exposure mode, and the other aperture value or shutter speed changes according to the subject brightness. This is equivalent to changing the combination of shutter speed and aperture value in the program exposure mode. The effect of is obtained.

Further, if the clear button 23 is turned on after the above-mentioned forced change of the exposure mode, the program returns to the program exposure mode easily. Therefore, the same effect as that obtained by temporarily changing the combination of the exposure factors in the program exposure mode can be obtained. Can be When the accuracy that can be manually set and the accuracy that can be automatically set are different, the shutter speed or the aperture value corresponding to the operated electronic dials 17 and 19 are changed.
It is possible to adopt a configuration in which the rounded value is held by rounding to a value of manually settable accuracy. Further, a configuration may be adopted in which the value is changed to a value larger or smaller by a predetermined value than the value determined in the program exposure mode and held.

[0213]

As described above, according to the present invention, in the program exposure mode, one of the exposure factors is set to the second precision time set in the program exposure mode by a simple operation.
Round Mino value to the value of the first accuracy increments possible manual setting
In the programmed exposure mode, since the other exposure factor changes automatically according to the photometric value,
It is possible to easily change the combination of the shutter speed and the aperture value without performing a normal exposure mode switching operation.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a single-lens reflex camera to which the present invention is applied.

FIG. 2 is a rear view of a main part of the embodiment.

FIG. 3 is a front view of a main part of the embodiment.

FIG. 4 is a block diagram showing a circuit configuration of the embodiment.

FIG. 5 is a flowchart relating to a main operation of a CPU.

FIG. 6 is a timing chart related to CPU-IPU communication.

FIG. 7 is a flowchart relating to an automatic exposure mode.

FIG. 8 is a flowchart relating to error processing.

FIG. 9 is a flowchart of an embodiment relating to a hyper program exposure mode of the present invention.

FIG. 10 is a diagram of the hyper program exposure mode.

FIG. 11 is a flowchart relating to an embodiment of the limited program exposure mode of the present invention.

FIG. 12 is a diagram of the limited program exposure mode.

FIG. 13 is a flowchart relating to an embodiment of a hyper shutter speed priority automatic exposure mode of the present invention.

FIG. 14 is a flowchart relating to a second embodiment of the hyper shutter speed priority exposure mode.

FIG. 15 is a diagram relating to an embodiment of the hyper shutter speed priority automatic exposure mode shown in FIGS. 13 and 14;

FIG. 16 is a flowchart relating to an embodiment of the hyper-aperture priority automatic exposure mode of the present invention.

FIG. 17 is a flowchart relating to a second embodiment of the hyper aperture priority automatic exposure mode.

FIG. 18 is a diagram of the hyper aperture priority automatic exposure mode shown in FIGS. 16 and 17;

FIG. 19 is a flowchart relating to the embodiment of the hyper-aperture priority automatic exposure mode of the present invention.

FIG. 20 is a flowchart relating to an LA manual exposure mode.

FIG. 21 is a flowchart relating to an LM manual exposure mode.

FIG. 22 is a flowchart relating to an LA valve exposure mode.

FIG. 23 is a flowchart relating to an LM valve mode.

FIG. 24 is a flowchart related to an LA hyper manual exposure mode.

FIG. 25 is a diagram illustrating an example of a hyper per manual select flag.

FIG. 26 is a flowchart related to a main operation of the IPU.

FIG. 27 is a flowchart relating to communication between the IPU and the photographing lens.

FIG. 28 is a flowchart related to a switch input process.

FIG. 29 is a flowchart related to a Tv electronic dial process.

FIG. 30 is a flowchart relating to an Av electronic dial process.

FIG. 31 is a flowchart relating to a process of changing the aperture value Av by the Av electronic dial.

FIG. 32 is a flowchart relating to a shutter speed changing process by the TV electronic dial.

FIG. 33 is a flowchart related to a mode shift process.

FIG. 34A,

FIG. 34B is a flowchart related to an exposure mode selection process.

FIG. 35 is a flowchart related to a check process.

FIG. 36 is a diagram illustrating a configuration example of data in a RAM in the IPU.

FIG. 37 is a flowchart related to a memory lock process.

FIG. 38 is a diagram illustrating a configuration example of a memory lock flag in a RAM of an IPU.

FIG. 39A,

FIG. 39B,

FIG. 39C,

FIG. 39D,

FIG. 39E;

FIG. 39F,

FIG. 39G,

FIG. 39H is a flowchart relating to the embodiment of the display processing of the present invention.

FIG. 40 is a flowchart related to an Ev check process of the embodiment.

FIG. 41A,

FIG. 41B,

FIG. 41C,

FIG. 41D,

FIG. 41E,

FIG. 41F is a diagram showing a different initial display mode of the LCD panel and the display unit in the finder.

FIG. 42A,

FIG. 42B,

FIG. 42C,

FIG. 42D,

FIG. 42E,

FIG. 42F,

FIG. 42G,

FIG. 42H is a diagram showing a display mode of the LCD panel and the display unit in the finder in different exposure modes.

FIG. 43A,

FIG. 43B,

FIG. 43C is a diagram showing a display mode of different exposure modes in the lens manual of the LCD panel and the display unit in the viewfinder.

FIG. 44A,

FIG. 44B is a flowchart concerning a second example of the display processing for the hyper program shown in FIG. 39A.

FIG. 45 is a subroutine relating to a second TV dial check operation.

FIG. 46 is a subroutine relating to a second Av dial check operation.

[Explanation of symbols]

 11 Camera Body 17 Tv Electronic Dial 19 Av Electronic Dial 23 Clear Button 25 Hold Button 41 CPU 41a ROM 41b RAM 43 IPU 43a ROM 43b RAM 45 Shooting Lens 69 LCD Panel 71 Display Unit in Viewfinder

Continued on the front page (72) Inventor Toshiyuki Kitazawa 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Optical Industry Co., Ltd. (72) Inventor Takayuki Izumi 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Kogaku (72) Inventor Masato Yamamoto 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Optical Industry Co., Ltd. (72) Inventor Toshimasa Yamanaka 2-36-9, Maeno-cho, Itabashi-ku, Tokyo Asahi Optical Within Kogyo Co., Ltd. (72) Inventor Takeshi Shishikura 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Optical Co., Ltd. (72) Inventor Akio Takahashi 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Kogaku (56) References JP-A-56-121020 (JP, A) JP-A-2-139527 (JP, A) JP-A-60-37532 (JP, A) JP-A-2-21433 (JP, A) , A) JP-A-58-63922 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 7/00 101 G03B 7/08 101

Claims (5)

(57) [Claims] A first and a second manual setting means for independently setting a shutter speed and an aperture value as a pair of exposure factors at a first precision step ; Exposure factor of the second finer than the first precision step
A program exposure mode for automatically setting the photometric means in accordance with the photometric value of the photometric means in increments of; and allowing one of the pair of exposure factors to be set by the corresponding manual setting means and the other being the photometric means An automatic exposure mode that is automatically set according to the photometric value of; and an exposure factor corresponding to the operated manual setting means when the first or second manual setting means is operated in the program exposure mode. An exposure mode forcibly changing means for forcibly changing to the automatic exposure mode which can be manually set; and when the automatic exposure mode is forcibly changed from the program exposure mode to the automatic exposure mode by the exposure mode forcible changing means, the exposure mode is set in the program exposure mode. and an exposure factor setting means for holding an exposure factor of one; provided with said exposure factor setting means, the Out forced mode change means
From the above program exposure mode to automatic exposure mode
If it is forcibly changed, the above manual setting means
Program exposure before change in manually set exposure factor
Enter the value of the second precision step set in the output mode.
The value of the first precision step rounded to the value of the step and rounded
Manual setting of automatic exposure mode after forced change
A camera exposure control device, wherein the exposure factor is set to a value that can be set in (1) . 2. The exposure control device for a camera according to claim 1, wherein said first and second manual setting means include:
An exposure control device for a camera, comprising an electronic dial for independently setting the shutter speed and the aperture value. 3. An exposure control device for a camera according to claim 1, wherein
From the above program exposure mode to automatic exposure mode
Is changed to the first or second
Change the exposure factor corresponding to the manual setting
The exposure factor value set in the program exposure mode is
Rounded to the precision increment of 1 and kept as the set exposure factor
Then, when the manual setting means is operated,
Setting Exposure factor of the camera to increase or decrease set at the first precision increments
Exposure control device. 4. An exposure control device for a camera according to claim 1, wherein
From the above program exposure mode to automatic exposure mode
Is changed to the first or second
Change the exposure factor corresponding to the manual setting
The exposure factor value set in the program exposure mode is
Rounded to a precision step of 1 and further rounded to the rounded value
Set a value that is added or subtracted by the first precision increment
Hold as exposure factor, then manually set as above
When the is operated, the exposure factor is set according to the operation.
An exposure control device for a camera that can be set to increase or decrease in increments of 1. 5. A camera according to claim 1, wherein
Camera is a table that displays the value of the pair of exposure factors set above.
Indicating means, and the control means displays on the display means.
As the display data to be displayed, the value of the second precision step is circled.
To generate the value of the first precision step,
Exposure control of the camera that displays the value of the degree increment on the display means
Control device.