JP3164623B2 - 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.

[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 number of exposure modes equipped in a camera has been increased, and modes other than the exposure mode such as a continuous shooting mode are also increasing. For this reason, a configuration in which these modes are 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, only a few specific modes are used. For this reason, switching by the conventional combination switch operation is complicated and cumbersome, and in some cases, the mode intended by the photographer cannot be easily set.

In the conventional program exposure mode,
Since the aperture value and the shutter speed are automatically determined in a fixed relationship, the aperture value or the shutter speed outside this relationship cannot be set by the photographer's intention.
In the conventional program shift mode, in the program exposure mode, both the aperture value and the shutter speed change simultaneously by a switch operation, and only one of them can not be changed. Therefore, in the conventional camera, when only one of the aperture value and the shutter speed is to be changed in the program exposure mode, the operation has to be switched from the program exposure mode to the aperture priority exposure mode or the shutter speed priority exposure mode, which is troublesome.

In the conventional manual exposure mode, an exposure meter provided in the viewfinder field of view measures whether or not the exposure is proper, and the photographer sets an appropriate shutter speed and aperture value. In other words, since all the exposure factors are set by the photographer, more artistic or more sophisticated photographing can be performed in accordance with the photographer's intention.

However, it is very troublesome for general users to adjust both the shutter speed and the aperture value one by one. In particular, when the brightness of the subject changes rapidly depending on the composition, or when performing zooming manually, the adjustment operation of the photographer may not be able to keep up. Further, the operation of changing the exposure mode between the manual exposure mode and the automatic exposure mode must be performed by two or more switch operations, which is troublesome.

[0008]

SUMMARY OF THE INVENTION The present invention has been made based on the awareness of the problems of the above-described conventional exposure control device. In a manual exposure mode, one or both of the exposure factors can be changed to an automatic exposure mode or a program exposure mode by a simple operation. It is an object of the present invention to provide a camera exposure control device which is changed to a value obtained by the following.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, an exposure control apparatus for a camera according to the present invention comprises:
Manual setting of shutter speed, manual setting of shutter speed provided on the camera body, manual setting of aperture value, manual setting of aperture value provided on the camera body and the taking lens, and a pair of exposure factors, A manual exposure mode for exposing according to the shutter speed and aperture value set by the shutter speed manual setting means and the aperture value manual setting means, and a photometric value of the photometric means and the shutter speed manual setting means or the aperture value manual setting means. An automatic exposure mode for calculating and exposing the other exposure factor according to the set value of one exposure factor, and a program for calculating and exposing the pair of exposure factors according to the photometric value of the photometric means. Exposure mode and manual exposure mode Set mode switching means for switching between a lens set mode in which an aperture value is set by an aperture value manual setting means on the taking lens, and a body set mode in which the aperture value is set by manual aperture value setting means on the camera body; and the manual exposure mode In the above, when the lens set mode is set by the set mode switching means, the shutter speed set by the shutter speed manual setting means is changed to a value calculated by the automatic exposure mode, and And a manual shift means for changing the pair of exposure factors to a value calculated in the program exposure mode or changing only one of the exposure factors to a value calculated in the automatic exposure mode when the set mode is set. It is characterized by the following (claim 1). The manual shutter speed setting means and the manual aperture value setting means on the camera body side can be constituted by an electronic dial, and the manual aperture value setting means on the lens side can be constituted by an aperture ring of the lens. (Claim 2).

Further, the manual shift means is provided with an operation means which is turned on and off, and when the operation means is turned on, the above-mentioned change processing is executed, and the operation means is switched from on to off. Thereafter, the exposure factor set by the change processing performed while the operation means is on may be used as it is (claim 3).

[0011]

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 slidable in two opposite directions from the neutral position are provided 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, on the mount 35 of the camera body 11, mount pins (CONT, RES / Fmin3, SI / Fmin2, Fmax1, A / M, Fmax)
2, ^- SCK ^- / Fmin1) is provided. Through an electrical connection between each of these pins and a corresponding mount pin provided on a mount (not shown) of the photographing lens, the camera body 11 moves the photographing lens from a minimum F number Fmin (open F number) and a maximum F number. The lens data such as Fmax is read, and communication is performed with control means (ROM or CPU) mounted on the photographing lens to read lens data such as the focal length f and the 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,
The camera is provided with a RAM 43b for temporarily storing various data such as a shutter speed and an aperture value, and an E2PROM 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 converted into digital values (BV, BV) corresponding to the apex value by the AD converter 51. Converted and converted from ports P30-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.

The ports P10 to P14 of the CPU 41 have DX
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.

Furthermore, mount pins (A / M, CONT, RES / Fmin3, SI / Fmin2, Fma) are connected to the ports PL0 to PL6 of the IPU 43.
^{x1, 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
Is a photographing lens 65 through these ports PL0 to PL6.
And lens data such as the open F number Fmin, the maximum F number Fmax, and the focal length f are read.

Further, the photographing lens 65 is provided with a lens auto / manual changeover switch 67 for interlocking with the aperture ring 12 for discriminating whether the aperture is automatic or manual. 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 SWEF and ISO
The sensitivity setting switch SWISO is linked with the exposure compensation / ISO lever 27. The clear switch SWCL is the clear button 23
, And the hold switch SWHOLD is a normally open switch that is interlocked with the hold button 25.

The IPU 43 knows the ON / OFF state of each switch SW by inputting the level of each input port PC, 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 shooting such as an exposure mode, a shutter speed Tv, an aperture value Av, and the number of shots, a drive mode, and various conditions (such as ISO sensitivity information and exposure correction EF information) are displayed. The display member 71 in the viewfinder 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 main circuit configuration of the camera system has been described above. 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 to receive 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 step 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
Communication is performed with the PU 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, CPU 41, IPU 43 each CE terminal, READY terminal, ^- SCK ^- terminal and DAT
It has an A terminal, and these corresponding terminals are respectively 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 is, and to monitor the interrupt enable, ^- SCK
^- it outputs the clock to the terminal, and outputs the command to the DATA terminal. When the IPU 43 completes receiving the command, the IPU 43
The EADY terminal is lowered and started to notify the CPU 41 that the reception is completed. Then, CPU41 of ^- SCK
^- in synchronism with the 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 BVD = 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 SVD = Sv.
-1, (SVD = SV-1), XVD = 4-Xv, and (XVD = 4-XV) are converted into a calculation sensitivity SVD (SVD) and a calculation exposure correction value XVD (XVD) suitable for calculation ( S52).

The above processing is performed by calculating exposure factors (BVD, S
VD, XVD) to prevent the values from becoming negative and to adjust the accuracy of each exposure factor to 1/8 Ev steps to facilitate the apex calculation of addition and subtraction without considering the calculation accuracy. is there. Since Sv and Xv have an accuracy of 1/3 Ev, they cannot be accurately converted into 1/8 Ev steps. Therefore, rounding is performed to reduce 1/3 Ev to 3/8 Ev.
v is subjected to a process of approximating 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 BVD and the calculation sensitivity S
The calculation exposure value LVD (LVD) is calculated by the following equation based on the VD, the calculation exposure correction value XVD, and the photometric correction amount MND (S54). LVD = BVD + SVD + XVD + 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 TVD and the calculation aperture value AVD are changed to the calculation maximum shutter speed TVMAX and the calculation maximum aperture value AVDMAX, respectively, and the EE pulse number PNo is changed to the maximum value 22.
5 to convert the aperture value for calculation AVD and the shutter speed for calculation TVD 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 TVD and the calculation aperture value AVD may be configured such that both or one of them is changed to the calculation minimum shutter speed TVMIN or the calculation minimum aperture value AVDMIN.

"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 the TVD (TVD) value for calculation corresponding to the Tv value and the AVD (AVD) value for calculation corresponding to the Av value is obtained by the following modification based on the equation of S54. LVD = BVD + SVD + XVD + MND = (Bv + 7) + (Sv-1) + (4-Xv) + MND = (Bv + Sv-Xv + MND) + 10 = Ev + 10 = Tv + Av + 10 = (Tv + 5 + 4/4) + (Av) / 8) = TVD + AVD Here, Ev = Bv + Sv-Xv + MND TVD = Tv + 5 4/8 (1) AVD = 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, constants 5 4/8 and 4/4/8 are added to TVD and AVD, respectively, but they 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 TVD is calculated by the calculation exposure value LVD calculated in step 54 and a predetermined program calculation expression below, TVD = 3/8 LVD + 4 6/8, and based on this, the optimum calculation aperture value AVD is calculated. Find (S61-S
78). The above equation can be obtained by substituting TVD = Tv + 5 4/8 and AVD = Av + 4 4/8 into Tv = 3/8 Ev + 3 (formula of the program line). The optimal calculation shutter speed TVD and the optimal calculation aperture value AVD
Within the shutter capacity range of the camera body 11 (between the maximum shutter speed TVDMAX (TVDMAX) for calculation and the minimum shutter speed TVDMIN (TVDMIN) for calculation) and within the aperture capability range of the taking lens (maximum aperture value AVDMAX (AVDMAX ) And the minimum aperture value for calculation AVDMIN (AVDMIN)), these optimal values are held, and the number of EE pulses PN for holding the aperture of the photographing lens at the optimal aperture value Av upon release is calculated. (S62, S64 to S66, S68, S69, S
72). Here, the maximum shutter speed TVDMAX means the highest shutter speed, and the minimum aperture value AVDMIN means the open aperture value.

The maximum and minimum shutter speeds TVMAX (TVMAX),
TVMIN (TVMIN) is a value unique to the camera body 11,
In this embodiment, TVMAX = 13 (1/8000 second), TVM
IN = −5 (30 seconds). Therefore, the maximum for arithmetic,
The minimum shutter speeds TVDMAX and TVDMIN are given by the equation TVD = Tv
By +5 4/8, it is expressed as TVDMAX = TVMAX + 5 4/8 = 18 4/8 TVDMIN = TVMIN + 5 4/8 = 0/4/8. These calculation shutter speeds TVDMA
X and TVDMIN are stored in advance in the internal ROM 41a of the CPU 41, and are stored at predetermined addresses in the RAM 41b during processing.

Further, the maximum and minimum aperture values AVDMAX,
AVDMIN is a value represented by the following formulas: AVD = AVMAX + 4 4/8, and AVDMIN = AVMIN + 4 4/8, where AVD = Av + 4 4/8, and the maximum and minimum aperture values AVMAX and AvMIN, which are values specific to the taking lens. Maximum and minimum aperture value AMVA
X and AVMIN are input by the lens communication of S35 in the lens communication, and the calculated maximum and minimum aperture values for calculation AVDMAX and AVDMIN are stored in predetermined addresses of the internal RAM 41b of the CPU 41.

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
When 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 (S65, S66, S68, S7).
2).

When the optimum calculation aperture value AVD is larger than the maximum calculation aperture value AVDMAX, the optimum calculation aperture value AVD
Is changed to the calculation maximum aperture value AVDMAX, and then the optimum calculation shutter speed TVD is calculated again (S65 to S68). If the recalculated calculation shutter speed TVD is higher than the calculation maximum shutter speed TVDMAX, a proper exposure cannot be obtained regardless of how the calculation shutter speed TVD and the calculation aperture value AVD are combined. It is out of the range, so Ev identifying that it is out of the interlocking range
The external bit is set to "1" and the arithmetic shutter speed TVD is changed to the arithmetic maximum shutter speed TVDMAX, and then the EE pulse number PN is obtained (S69 to S72).
When the recalculated calculation shutter speed TVD is within the shutter capability range, proper exposure is possible.
By skipping the process of S71, the EE pulse number PN is obtained based on the optimum calculation aperture value AVD (S69, S72).

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

(When it is too dark) When the optimum calculation aperture value AVD is smaller than the calculation minimum aperture value AVDMIN, the calculation aperture value AVD is changed to the calculation minimum aperture value AVDMIN, and then the optimum calculation shutter speed TVD is set. If the value is within the range of the shutter capacity, 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 operation shutter speed TVD is smaller than the operation minimum shutter speed T DVMIN, underexposure occurs. Therefore, the Ev external bit is set to “1” and the operation shutter speed TVD is set to the operation minimum shutter speed T DVMIN. After setting to TDVMIN, 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 shutter speed for calculation TVD are set to IPU4
Aperture value for transfer AVT (AVT) to facilitate processing in 3
Is converted to the transfer shutter speed TVT (TVT) (S7
9, S80). Calculation aperture value AVD and transfer aperture value AVT,
And calculation shutter speed TVD and transfer shutter speed T
The relationship with VT is as follows. TVT = TVD + 10 4/8 AVT = AVD Note that the transfer shutter speed TVT and the transfer aperture value AVT
Is data of 1/2 Ev step. That is, the CPU 4
When sending from 1 to the IPU 43, the value calculated in the 1/8 Ev step is rounded to the 1/2 Ev step. IPU43
Then, since these values are used only for display, 1/2 Ev
This is because the step accuracy is sufficient. In Tables 2 and 3 above,
The example of the display division corresponding to TVD and AVD is shown.

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 speed TVD1 for calculation.
(TVD1), TVD2 (TVD2), and the minimum and maximum aperture values for calculation, AVD1 (AVD1) and AVD2 (AVD2), are shown in the subroutine of the limited program (auto 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 AVDMIN (AVDMIN) and AVMAX (AVDMAX) are replaced with the set minimum and maximum aperture values AVD1 and AVD2, respectively (S8).
5, S93, S86, S87), except that the calculation minimum and maximum shutter speeds TVDMIN (TVDMIN) and TVDMAX (TVDMAX) are replaced with the set minimum and maximum shutter speeds TVD1 and TVD2, 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 for calculation, AVD1, AVD2
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 TVT (TVT) transferred from the IPU 43 by communication is read and converted into the calculation shutter speed TVD (TVD) (S10).
1). Here, the relationship between the transfer shutter speed TVT and the calculation shutter speed TVD is as follows. TVD = TVT-10 4/8 Note that the transfer shutter speed is data of 1/2 Ev step, and the calculation shutter speed TVD is used at the same time as the calculation.
1/8 Ev Performs digit alignment on step data. Next, an optimum calculation aperture value AVD is calculated from 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, S104, 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. (When the aperture value is too bright) If the optimum calculation aperture value AVD is larger than the maximum calculation aperture value AVDMAX, the calculation aperture value AVD is changed to the maximum calculation aperture value AVDMAX. However, this change results in overexposure. An EE pulse number PN is set after setting the Av non-link bit for identifying that the value Av is out of synchronization (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.

If the optimum calculation aperture value AVD is smaller than the minimum calculation aperture value AVDMIN (when it is too dark), the calculation aperture value AVD is changed to the minimum calculation aperture value AVDMIN, but this change results in underexposure. Therefore, after setting the Av external bit, 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 AVD and the shutter speed for calculation TVD are converted into the aperture value for transfer AVT and the shutter speed for transfer TVT, respectively, and the (AVDT, TVDT) process is completed. (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 AVT (AVT) transferred from the IPU 43 by communication is read and converted into an aperture value for calculation AVD (AVD) (S131). Here, the relationship between the transfer aperture value AVT and the calculation aperture value AVD is AVD = AVT. The aperture value for transfer is 1/2 Ev
Digit alignment is performed on 1/8 Ev step data of AVD, which is step data and is an aperture value for calculation at the same time as calculation. Next, the optimum calculation shutter speed TVD is calculated from this value and the calculation exposure value LVD (S132).

If the optimum calculation shutter speed TVD is within the shutter capability range, the above values are held and the EE pulse number PN is calculated based on the calculation aperture value AVD (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. If the optimum calculation shutter speed TVD is higher than the calculation maximum shutter speed TVDMAX (when the image is too bright), the calculation shutter speed TVD is changed to the calculation maximum shutter speed TVDMAX. After setting the Tv external bit for identifying that the speed Tv is outside the shutter capability, the EE pulse number PN is set (S133, S136 to S140).

(When it is too dark) If the optimal calculation shutter speed TVD is smaller than the minimum calculation shutter speed TVDMIN, the calculation shutter speed TVD is changed to the minimum calculation shutter speed TVDMIN. Therefore, the number of EE pulses PN is set to 0 after setting the Tv extra bit (S133 to S135, S137, S138 to S14)
0).

When the setting of the EE pulse number PN is completed, the calculation aperture value AVD and the calculation shutter speed TVD are converted into the transfer aperture value AVT and the transfer shutter speed TVT, respectively, and the calculation of the exposure factor is completed. (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, the set shutter speed TVT stored in the IPU 43 is read by operating the Tv electronic dial 17, and is converted into a calculation shutter speed TVD. The aperture value AVD for optimal calculation is calculated with the value LVD (S121, S12
2). If the optimum calculation aperture value AVD is within the aperture capability range, the process directly enters S132 of the hyper ES automatic exposure mode (FIG. 16) (S123, S125, S127).

The aperture value for optimal calculation AVD when the subject is too bright
Is larger than the calculation maximum aperture value AVDMAX, the optimum calculation aperture value AVD is changed to the calculation maximum aperture value AVDMAX, and then the process proceeds to S132 (S123 to S125, S127). The subject is too dark and the optimal aperture value for calculation AVD is the minimum aperture value for calculation A
When it is smaller than VDMIN, the aperture value A
After changing VD to the minimum aperture value for calculation AVDMIN, 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 AVT stored in the IPU 43 is read and converted into a calculation aperture value AVD. The shutter speed TVD for optimum calculation is calculated based on the LVD (S151, S
152). If the optimal calculation shutter speed TVD is within the shutter capacity 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 TVD is higher than the maximum calculation shutter speed TVDMAX, the optimal calculation shutter speed TVD is changed to the maximum calculation shutter speed TVDMAX before the shutter priority automatic exposure mode. (S153 to S155,
S157).

If the subject is too dark and the optimum calculation shutter speed TVD is lower than the minimum calculation shutter speed TVDMIN, the optimum calculation shutter speed TVD is changed to the minimum calculation shutter speed TVDMIN before the operation proceeds to S102 (S1).
53, S155 to S157). In S102, the aperture value for calculation AVD 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, E2 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 TVD and the calculation aperture value AVD 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 AVT and the set shutter speed TVT sent from the IPU 43 are converted and set as they are in the calculation aperture value AVD and the calculation shutter speed TVD, respectively, and the flow proceeds to S167. (S161 to S163).

In S167, the exposure value (AVD + TVD) based on the calculation aperture value AVD equal to the set value and the calculation shutter speed TVD equal to the set value, and the appropriate calculation exposure value LVD based on the actual photometry are calculated from The exposure error ΔEv is calculated by the following equation. ΔEv = LVD- (AVD + TVD)

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 AVD.
The number of pulses PN is obtained (S173, S174, S17
5) Calculation aperture value AVD and calculation shutter speed TVD
Is converted to the transfer aperture value AVT and the transfer shutter speed TVT, respectively, and the process 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] The above-described processing is performed when the clear button 23 is turned on, and Tv, A measured in the program automatic exposure mode.
Although the example is changed to the v value, a configuration in which only one of the exposure factors (shutter speed Tv or aperture value Av) is changed to an appropriate value may be used. Further, since the exposure mode is the manual exposure mode, it is possible to set Tv and Av series values even if the exposure value is not the proper exposure value Ev. Here, the Tv and Av series values are the apex value steps set by the calculation of the CPU 41 smaller than the manually settable apex value steps, so that the calculated apex values can be set manually. The value rounded to the value step.

The E2PROM 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 exposure factors is changed to an appropriate value using the data of the hyper manual select flag of the E2PROM 43c in the IPU 43 and an example of an appropriate / sequence change. The data in the E2PROM 43c is stored in the RAM 43b of the IPU 43 during operation, but the same data is stored in the CPU 4 by 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, calculation aperture value AVD and display shutter speed TVT,
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 calculation appropriate values TVD, A
Although the VD is obtained, the values of the display shutter speed TVT and the aperture value AVT calculated based on these values (S60
5, the shutter speed for calculation TVD (S613) and the aperture value for calculation AVD (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 calculated proper shutter speed TVD and aperture value AVD once obtained are converted into the calculation sequence shutter speed TVD and aperture value AVD. 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.

[Hyper-Manual Exposure Mode of LM] Next, the flowchart shown in FIG. 20 will be described for the 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. It will be described with reference to 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 TVT (a value of a 1/2 Ev step) sent from the IPU 43 is directly converted into the calculation shutter speed TVD, 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 AVVRD (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 AVADJ (AVADJ) unique to the camera body 11. calculate. Then, based on these values, the exposure error .DELTA.Ev is calculated by the following equation: .DELTA.Ev = LVD-TVD-AVVRD-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
N is set to the maximum value (255 in this embodiment), the calculation shutter speed TVD is converted to the transfer shutter speed TVT, and the exposure factor setting process ends (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 AVVRD 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 AVADJ unique to the camera body 11 (S201). ). Further, based on these values, the calculation shutter speed TVD is calculated by the equation TVD = LVD-AVVRD-MND (S20).
2). 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 TVD is higher than the calculation maximum shutter speed TVMAX, change it to this (S203, S20
4) If the shutter speed is smaller than the minimum shutter speed for calculation TVMIN, 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 TVD is set to IPU
Then, the process is converted to the transfer shutter speed TVT to be transferred to S43, and the process ends (S209).

[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
Is read by the CPU-IPU communication and converted into the aperture value for calculation AVD (S2).
11). The EE corresponding to the calculation aperture value AVD
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 calculation aperture value AVD is again converted to the transfer aperture value AVT, and the process is terminated (S215, S216). When the calculation aperture value AVD is equal to the calculation minimum aperture value AVDMIN, 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. Photographing information such as the transfer aperture value AVT, the transfer shutter speed TVT, 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.

"Communication process with lens" The subroutine relating to communication with the lens CPU in S225 will be described.
This will be described with reference to FIG. First, the IPU 43
NT is lowered to the “L” level (logic “0”), and the mount pin information (open F number Fmin, maximum F number Fmax)
And auto / manual (A / M) information) (S31, S32). The applicant's earlier application (Japanese Unexamined Patent Application Publication
63-184719), the pin RES / Fmin3, SI /
Fmin2, Fmax1, Fmax2 and ^- SCK ^- / Fmin1 the pins of the photographing lens in contact with the be connected transistors, the combination of level changes by ON / OFF of each transistor, the open F number Fmin and 2 bits of 3 bits Of the maximum F-number Fmax. Further, an A / M switch SWA / M is connected to the pin A / M, and 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. 29 and 30 show flowcharts of subroutines relating to electronic dial processing. This subroutine is executed by generating an interrupt when the Tv and Av electronic dials 17 and 19 are rotated in either direction and any of the ports PA0, A1, A2 and A3 becomes "0". First, the respective Tv and Av dial change bits are set (S271, S281).

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 have the same exposure mode number (14) as the Hyper program.
It is identified by the Hyp-Av flag.

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.
When any one of the Lensbit, the Hyper Av flag, and the Hyper Tv flag is set, the mode display process is performed after the Hyper Av flag and the Hyper Tv flag are lowered, and the routine returns. The hyper Tv flag and the hyper Av flag are alternatives 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 S647 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,
9 are not operated, the hyper program exposure mode is indicated as "HYP", the shutter speed Tv is initially set to "Tv 8oo" (1/8000 second), and the aperture value is set to A.
The initial value “Av 5.6” (F5.6) of v 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. Each value is displayed in the viewfinder display unit 71
(S302 to S308).

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

When the Tv electronic dial 17 is 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 in accordance with the operation of the Tv electronic dial 17, and the changed value is set to a predetermined address of the RAM 43b, so that the hyper-EE automatic exposure mode and the set shutter speed Tv are set to L.
The information is displayed on the CD panel 69 and the display unit 71 in the viewfinder in the manner shown in FIG. 42G (S312, S313). The initial value of the set shutter speed Tv is a value calculated in the hyper program exposure mode or the hyper EE exposure mode. The display “Tv” on the LCD panel 69
A 3/4 circle surrounding the circle and an arrow of a right-angled acute triangle disposed above the circle and an underline of "4oo" displayed on the display unit 71 in the finder are indicated by a shutter speed Tv by rotating the Tv electronic dial 17. Is displayed that can be changed.

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. Calculated optimal transfer shutter speed TVT, 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. In this embodiment, the exposure factor is changed at the same time as the exposure mode is changed. However, when the exposure mode is switched to another exposure mode, the optimal shutter speed or the optimal shutter speed calculated in the exposure mode before switching is set. The optimal aperture value Av may be the initial value of the exposure factor that can be manually set in the exposure mode after the switching, and the exposure factor may be changed by operating the next dial.

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 already described in the description of the flowcharts of FIGS. 33 to 35, the above-described hyper Tv,
The Av flag is set when the clear button 23 is turned on (S261 to S263), when the hyper program exposure mode is selected in the mode selection processing, and when the main switch S is pressed.
It is released when WMAIN is turned off and when the taking lens is detached, and is then initialized to the hyper-program automatic exposure mode when it is returned to its original state.

[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, the 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 ON, the limit shutter speeds TV1, TV2 and the limit aperture values AV1, AV2 are initialized (S463-1, S4).
63-2). Note that the initial values of the limit shutter speed and the limit aperture value in the present embodiment in the limited program exposure mode are lower limit shutter speed TV1 = TVMIN = 3.
0 (second), upper limit shutter speed TV2 = TVMAX = 1/8000
(Seconds) and lower limit aperture value AV1 = AVMIN, upper limit aperture value AV2
= AVMAX. These initial values are set when the limited program exposure mode is first selected after the battery is loaded. However, when the clear switch SWCL is turned off, the limit shutter speeds TV1 and TV2 are set.
And without resetting the values of the limit aperture values AV1 and AV2,
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, on condition that the hold button 25 is turned on, the upper and lower shutter speeds TV1, TV1,
Set TV2. That is, if the ON operation of the hold button 25 is the first or odd-numbered operation, the ML mode flag is set, so the Tv value set data is changed to the lower limit shutter speed TV1 (S467 to S47).
0) If it is the second or even number, the Tv value set data is changed to the upper limit shutter speed TV2, and the process proceeds to S485 (S467, S468, S469, S472). If the hold button 25 has not been 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 AV1, and in the case of the second or even number (ML mode flag = 0), the Av value set data is changed to the upper limit aperture value AV2, and the process proceeds to S485. S478, S479, S48
2).

The above-described limit shutter speeds TV1, TV2,
When the changing process of the limit aperture values AV1, AV2, etc. 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, and 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 sets LC
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 TVT and the aperture value AVT are sent out, and the CPU 41 reads the fixed-point LED bit calculated by the manual exposure subroutine of the body set, sets the bit in the RAM 43a, and sets the exposure display element 71
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 hyper manual exposure mode is selected, the effect is displayed on the LCD panel 69 in the manner shown in FIG. 43A (S301, S371 to S373). If the Tv electronic dial 17 is 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 the LCD panel 69 is set.
Etc. (S374 to S376).

Further, if the CPU 41 is held in power, the CPU 41 sends the shutter speed Tv TVT and the aperture value AVT selected in the manual exposure mode to the CPU 41, and reads the fixed point LED bit set in the LA manual exposure subroutine. It is set in the RAM 43b and lighting control of the exposure display elements 71a and 71b is performed (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 TVT 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).

[Ev Check Subroutine] The Ev check in this embodiment locks the appropriate exposure value at the time when the hold switch 25 is turned on, and is operated when the electronic dials 17 and 19 are rotated thereafter. The other exposure factor (aperture value or shutter speed) is increased / decreased in response to the operation while the other exposure factor (aperture value or shutter speed) is decreased / increased so that the locked exposure value does not change. is there. In the EV check subroutine in S352, the hold button 25
Is turned on, provided that the e-dial 1
The shutter speed TV and the aperture value AV are increased and decreased in units of 1/2 TV and 1/2 AV each time the rotation of the shutters 7 and 19 is performed by one step. Regarding the operation of this EV 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. First, if the hold bit is "0", since the hold button 25 has not been turned on, the shutter speed TV and the aperture value AV which have already been set are set and the process returns (S421,
S437). When the hold bit is "1", that is, when the hold button 25 is turned on, the following processing is performed.

When the TV electronic dial 17 is rotated one step (or more) to the left (when the TV change bit is "0"), the shutter speed TV becomes TV = -5 (30
Seconds) or the aperture value AV is the maximum aperture value AVMAX
, The shutter speed TV is subtracted in 1/2 TV units, and the aperture value AV is added in 1/2 AV 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).

When the TV electronic dial 17 is rotated to the right, the shutter speed TV becomes TV = 13 (1/800).
0 seconds) or the aperture value AV is the minimum aperture value AVMI
Until N, the shutter speed TV is added in 1/2 TV units, and the aperture value AV is subtracted in 1/2 AV units (S42).
2, S423, S430 to S433). Even when the AV electronic dial 19 is rotated to the left, the same addition and subtraction processing is performed as described above (S422, S428 to S43).
3). Then, the shutter speed TV and the aperture value AV thus added and subtracted are set in the RAM 43b, and the TV and AV dial change bits are reset, respectively, and the process returns (S434 to S437).

According to the above processing, by manually setting the appropriate shutter speed TV and the aperture value AV and then turning on the hold button 25 once, the operation of one of the electronic dials 17 and 19 causes the exposure value to be set. While keeping EV constant, both the shutter speed TV and the aperture value AV can be changed simultaneously. For example, assume that in the hyper manual mode, the shutter speed is 1/125 second and the aperture F8.0 is an appropriate exposure value. By turning on the hold button 25 in this state, the memory is locked first. Next, for example, by rotating the Tv electronic dial 17 in two steps, the shutter speed changes to 1/60 second and the aperture changes 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 shutter speed changes to change the exposure level.
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.

When the hyper program is selected in the lens auto mode, when neither the electronic dials 17 and 19 are rotated and both the hyper TV and the AV flags are down, the hyper program exposure mode is set. Therefore, the hyper program exposure mode is set by clearing the hyper TV flag and the hyper AV flag, and the display on the LCD panel 69 and the display unit 71 in the finder is changed to the mode shown in FIG. 42B (S501).
To S508). Then, on condition that the CPU 41 is held in power, the transfer calculation shutter speed TVT and the transfer aperture value AVT calculated by the CPU 41 are input, and R
It sets to AM43b and returns (S509, S510).

When the hyper EE automatic exposure mode is selected, the process proceeds from S505 to S514 since the hyper TV flag is set, and proceeds from S311 to S518 in S514 to S518.
The same processing as in S315 is performed. On the other hand, when the hyper ES automatic exposure mode is selected, since the hyper AV flag is set, the process proceeds from S506 to S524, and
In S528, the same processing as in S316 to S320 is performed.

When the TV electronic dial 17 or the AV electronic dial 19 is rotated, that is, when the TV change bit or the AV change bit is "1", the TV dial check and the AV dial check subroutines are performed. The TV and AV dial check subroutine is a process in which the exposure mode is not changed unless the TV and AV electronic dials 17 and 19 are turned in two or more steps in the same direction.

When the TV electronic dial 17 or the AV electronic dial 19 is rotated by one step, or when rotated by one step in the opposite direction after rotating by one step, the process proceeds to S505 (S503, S511, S505 or S503, S
504, S521, S505).

When the TV electronic dial 17 is rotated by two steps in the same direction, the process proceeds from S511 to S512. Here, when the hyper TV flag is down, since the hyper EE automatic exposure mode has not been selected yet, only the change to the hyper EE automatic exposure mode is possible, and the shutter speed T
After the TV dial change flag is cleared to disable the change of V, the process proceeds to S514 (S512, S513, S514). When the Hyper TV flag is on, Hyper E is already
E Since the automatic exposure mode is selected, the process directly proceeds to S514 to enable the change of the shutter speed TV (S512,
S514).

On the other hand, the AV electronic dial 19 is
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
In order to disable the change of V, clear the AV dial change flag and proceed to S524 (S521, S522, S523, S52
Four). When the hyper-AV 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 AV to be changed (S5).
21, S522, S524).

The TV and AV dial check subroutines of S511 and S521 will be described in more detail with reference to FIGS. In the TV dial check subroutine, first, it is checked whether or not the TV dummy flag is set (S551). Since the first time, the TV dummy flag is set, the current TV dial direction flag is set in the old TV dial direction flag, and the process returns to S505 (S552). At the second time, if the rotation direction of the TV electronic dial 17 is the same as the previous (first time), the current TV
Since the contents of the dial direction flags are the same, the TV dial dummy flag is set, the AV dial dummy flag is lowered, and the process proceeds to S512 (S553, S555). On the other hand, at the second time,
If the direction of rotation of the TV electronic dial 17 is different from the first time, the contents of the current and old TV dial direction flags are different, so the TV dial dummy flag is lowered and the current TV dial direction flag is inserted into the old TV dial direction flag. To S505 (S551, S553, S554).

In the AV dial check subroutine,
First, it is checked whether the AV dummy flag is set (S561). Since the first time, the AV dummy flag is set, the current AV dial direction flag is set in the old AV dial direction flag, and the process returns to S505 (S562). At the second time and when the rotation direction of the AV electronic dial 17 is the same as that at the first time, since the contents of the old AV dial direction flag are equal, the AV dial dummy flag is set, and the TV dial dummy flag is lowered. Proceed to S524 (S563, S565). On the other hand, in the second processing, if the rotation direction of the AV electronic dial 17 is different from that in the first processing, the contents of the old AV dial direction flag are different. The AV dial direction flag is set in the old AV dial direction flag, and the process proceeds to S505 (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
By simply rotating the shutters 7 and 19, the shutter speed TV or the aperture value AV according to the respective rotating operation directions can be changed up or down, or the shutter speed priority automatic exposure mode or the aperture priority automatic exposure mode can be changed. . 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, according to the present embodiment, when the clear button 23 is turned on in the manual exposure mode of the lens auto mode, the shutter speed and the aperture value manually set by operating the electronic dials 17 and 19 correspond to the photometric value. Since the value is changed to an appropriate value, substantially the same effect as switching to the program exposure mode by operating the clear button 23 can be obtained.

When the clear button 23 is turned on in the manual exposure mode of the lens manual, T
Since the shutter speed manually set by the V electronic dial 17 is changed to the shutter speed based on the photometric value, substantially the same effect as switching to the aperture priority exposure mode by the clear button 23 is obtained.

Furthermore, in this embodiment, when the clear button 23 is turned off, the original manual exposure mode is restored, so that the operability is very good.

In the present invention, in the manual exposure mode of the lens auto, one of the shutter speed and the aperture value may be changed to an appropriate value according to the brightness of the subject by turning on the clear button 23. .

[0215]

As described above, according to the present invention, when the manual shift means is operated in the manual exposure mode, the shutter speed is changed to a value corresponding to the photometry result in the case of the lens manual, and the manual operation is performed in the case of the lens automatic. Since one or both of the set exposure factors are changed according to the photometric result, the operation of the manual shift means allows the user to easily change from the manual exposure mode to the automatic exposure mode or the program exposure mode, or vice versa, depending on the set mode. Can be changed.

[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 relating to a second embodiment of the 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 processing for changing a shutter speed Tv by the Tv electronic dial.

FIG. 32 is a flowchart relating to a process of changing the aperture value Av using the Av e-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 Inside the Industrial Co., Ltd. (72) Inventor Takenao Shishikura 2-36-9 Maeno-cho, Itabashi-ku, Tokyo (56) References JP-A-63-123028 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 7/00 101 G03B 7/08

Claims (3)

(57) [Claims] 1. A photometric device for measuring subject brightness, a shutter speed manual setting device provided on a camera body for manually setting a shutter speed, and a shutter speed manual setting device provided on a camera body and a photographing lens, respectively. Aperture value manual setting means, as a pair of exposure factors, a manual exposure mode in which exposure is performed by the shutter speed and aperture value set by the shutter speed manual setting means and the aperture value manual setting means, and a photometric value of the photometric means. An automatic exposure mode for calculating and exposing the other exposure factor according to the value of one of the exposure factors set by the shutter speed manual setting unit or the aperture value manual setting unit; Exposure calculated and calculated according to the photometric value of the means In the manual exposure mode, a set for switching between the lens set mode in which the aperture value is set by the aperture value manual setting means on the photographing lens side and the body set mode in which the aperture value is set by the camera body side manual aperture value setting means. A mode switching unit, wherein in the manual exposure mode, when the lens set mode is set by the set mode switching unit, the shutter speed set by the shutter speed manual setting unit is a value calculated by the automatic exposure mode. On the other hand, when the body set mode is set, the pair of exposure factors is changed to a value calculated in the program exposure mode, or only one of the exposure factors is changed to a value calculated in the automatic exposure mode. With manual shift means and Exposure control device for a camera, characterized in that. 2. The shutter speed manual setting means and the camera body side aperture value manual setting means are electronic dials, and the lens side manual aperture value setting means is a lens aperture ring. Exposure control device for a camera according to claim 1. 3. The manual shift means includes an operation means that is turned on and off. When the operation means is turned on, the change processing is executed, and after the operation means is switched from on to off, 2. The camera exposure control apparatus according to claim 1, wherein an exposure factor set by a change process performed while the operation unit is on is used.