JPH0561096A - Exposure controller for camera - Google Patents

Abstract

PURPOSE:To easily hold an optimum exposure value by changing one of exposure factors so that the optimum exposure value based on a photometric value may be held while a manual shifting means is operated at the time of photographing under a manual exposure mode. CONSTITUTION:A CPU 41 is provided with functions such as a priority exposure factor changing means, an exposure value holding means and a manual shifting means, etc., in addition to a basic photographing function such as the function of calculating and deciding the exposure factor(stop value and shutter speed). And when the manual shifting means is operated under the manual exposure mode, the exposure factor is set based on an object brightness which is measured by a photometry means, and when the manual shifting means is in operating under the manual exposure mode, an exposure value calculating means makes the photometry means to continue the photometry, and furthermore, an optimum exposure value calculating action by the exposure value calculating means is kept to continue based on the photometric value by the photometry means. And when the operation of the manual shifting means is turned off, the final calculation result by the exposure value calculating means is held.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an exposure control device for a camera having a plurality of exposure modes including a manual exposure mode and an automatic exposure mode.

[0002]

2. Description of the Related Art Recent cameras have 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, in recent cameras, the number of exposure modes equipped is increasing, and the modes other than the exposure mode such as the continuous shooting mode are also increasing. For this reason, the switching of these modes is generally performed by a combination of a plurality of switches.

However, a general photographer rarely frequently switches among a large number of exposure modes to use. In other words, it uses only a few specific modes. Therefore, the switching by the conventional combination switch operation is complicated and cumbersome, and there is a situation in which 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, it is not possible to set the aperture value or the shutter speed outside this relationship by the photographer's intention.
In the conventional program shift mode, both the aperture value and the shutter speed are changed at the same time by the switch operation in the program exposure mode, and only one of them cannot be changed. Therefore, in the conventional camera, when only one of the aperture value and the shutter speed is desired to be changed in the program exposure mode, it is necessary to switch from the program exposure mode to the aperture priority exposure mode or the shutter speed priority exposure mode, and the operation is troublesome.

In the conventional manual exposure mode, the photographer sets an appropriate shutter speed and aperture value by measuring whether or not the exposure is proper with an exposure meter provided in the field of view of the finder. In other words, since the exposure factors are all set by the photographer himself, it was possible to take more artistic or artistic photography that is more in line 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 manual zooming is performed, the adjustment operation of the photographer may not catch up. In such a case, it is convenient if the exposure factor is temporarily and automatically set to an appropriate value.

However, in the conventional camera, since the exposure mode changing operation between the manual exposure mode and the automatic exposure mode must be performed by two or more normal switch operations, it cannot be changed quickly. It was annoying.

[0009]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the awareness of the problems of the above-mentioned conventional exposure control apparatus. In the manual exposure mode, one of the exposure factors is changed by a simple operation during the operation. An object of the present invention is to provide an exposure control device for a camera that is automatically set to maintain an appropriate exposure value.

[0010]

SUMMARY OF THE INVENTION To achieve this object, the present invention relates to a first and a second manual for independently setting a photometric means for photometrically measuring a subject brightness and a shutter speed and an aperture value as a pair of exposure factors. Setting means; an automatic exposure mode for automatically setting at least one of the pair of exposure factors according to the subject brightness by the photometric means, and the pair of manually set by the first and second manual setting means. Manual exposure mode in which the exposure is performed by the exposure factor, and exposure value calculation for continuing the photometry by the photometry means while the manual shift means is being operated, and for continuing the proper exposure value setting operation based on the photometry value of the photometry means Means and are provided.

According to this structure, when the manual shift means is operated during shooting in the manual exposure mode, the appropriate exposure factor based on the photometric value is automatically set continuously during that time.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. 1 is a top view showing an 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. 3 is a front view of the camera body.

A shutter button 15 is provided on the 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 arranged on the rear side (photographer side) of the shutter button 15, and Av (AV) is set on the rear surface (photographer side surface) of the grip portion 13.
An electronic dial 19 is provided. The Tv electronic dial 17 and the Av electronic dial 19 are rotary dials that are rotatable in the left and right directions, and the details thereof will be described later, but by rotating them, the shutter speed Tv, the aperture value Av, and the exposure mode can be changed. The electronic dials 17 and 19 form 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 on the right side of the clear button 23. The clear button 23 constitutes a part of the clear switch means.

When the photographer holds the camera body 11 in a normal photographing mode, the electronic dials 17 and 19, the clear button 23, and the hold button 25 can be operated with the index finger or thumb without holding the camera body 11. It is configured to operate.

On the upper surface of the camera body 11, an exposure correction / ISO lever 27 and an exposure mode / drive lever 29, which are slidable in two opposite directions from the neutral position on the left side of the pentaprism section, and the right side of the pentaprism section. A main switch 31 that is slidable in three positions is provided.

The cartridge storage room 33 of the camera body 11
Inside, DX pin DX that touches the DX code printed on the surface of the film cartridge and reads the data.
1 to DX6 are provided. These DX pins DX1 to DX
Reference numeral 6 reads the data by touching a portion of the DX code that represents the ISO sensitivity Sv.

Further, the mount 35 of the camera body 11 has a group of mount pins (CONT, RES / Fmin3, SI / Fmin2, Fmax1, A / M, Fmax) for communicating with the taking lens.
2, ^- SCK ^- / Fmin1) is provided. Through the electrical connection between each of these pins and the corresponding mount pin provided on the mount (not shown) of the taking lens, the camera body 11 can detect the minimum F number Fmin (open F number) and the maximum F number from the taking lens. Lens data such as Fmax is read, and further communication with a control means (ROM or CPU) mounted on the taking lens is performed to read lens data such as focal length f and lens type. In the present specification, symbols such as " ^- " and " ^- " sandwiched between " ^- " mean so-called active low or inverted signals.

Next, the outline of the circuit configuration of the control system of this camera system will be described with reference to FIG. The camera body 11 includes a CPU 41 and an IP as control means.
Equipped with U43. The CPU 41 calculates the exposure factor (aperture value Av and shutter speed Tv), performs a decision function, an exposure control function, a calculation relating to automatic focus adjustment, a basic photographing function such as a control function, a mode compulsory changing means, and an exposure mode return. It also has a function as a unit, a priority exposure factor changing unit, a specific exposure mode in-exposure mode forced changing unit, a limit value setting unit, an exposure value holding unit, a manual shift unit, and a set mode switching unit.

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 CPU 41 power on (power hold) and off It also has a function as a regulator, a set mode, a function as a memory means for storing the shutter speed Tv and the like. In addition, IPU43
, Switch information input judgment, various mode display, CPU4
1, a ROM 43a storing a program for communicating with the photographing lens 1, a communication with the photographing lens, various set modes,
A RAM 43b for temporarily storing various data such as a shutter speed and an aperture value, and an E2PROM 43c for retaining the number of films, ISO sensitivity and the like even after the power of the camera is turned off are provided.

The IPU 43 has a photographing lens 65.
Lens communication with the camera lens 65 to input lens information such as maximum F-number Fmax, minimum F-number Fmin, and focal length f from the taking lens 65, and exchange data relating to photographing with each other via the CPU 41 and the bus. And controls various operations and displays relating to shooting.

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 a digital value (BV, BV) corresponding to the apex value by the AD converter 51. Converted to CP from ports P30-P37
Input to U41.

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

The CPU 41 operates the AD converter 51 at a predetermined time to input the levels of the ports P30 to 37, reads the subject brightness signal and the aperture value signal set by the taking lens 65, and converts them into corresponding apex values. To do. The port P40 is an input switching control port for the logarithmic compression voltage amplified by the amplifier 49 and the diaphragm voltage by the diaphragm potentiometer 53.

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

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

The release magnet RL releases the lock of the mechanical shutter lock mechanism to start the release operation,
The front curtain magnet ES1 and the rear curtain magnet ES2 lock and release the shutter mechanism (shutter curtain) without the mechanical locking mechanism to control the travel of the shutter curtain, and the diaphragm magnet EE controls the diaphragm of the taking lens. Stop the squeezing operation of the squeezing mechanism. Turn on these magnets
/ OFF is controlled by the CPU 41 via the magnet drive circuit 61.

The EE pulse counter 63, after the release,
E linked with the focusing mechanism linked to the mirror up operation
An E pulse is generated and output to the port PDD 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. , Hold the aperture at its aperture value Av.

Further, mount pins (A / M, CONT, RES / Fmin3, SI / Fmin2, Fma) are attached 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
Takes a taking lens 65 through these ports PL0 to PL6.
The lens data such as the open F-number Fmin, the maximum F-number Fmax, and the focal length f is read by communicating with the camera.

Further, the taking lens 65 is provided with a lens auto / manual switch 67 which is linked to the aperture ring 12 and which discriminates 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 the port PL0 to know whether it is lens auto or lens manual. Note that lens auto is an automatic aperture that is stopped down by the aperture mechanism of the camera body up to the aperture value set on the camera body, and lens manual is the manual aperture that is set on the shooting lens side. That is. In the description of this embodiment, the lens auto is also called a "body set".

Input ports PC0 to PC2, PB0 of the IPU 43
The main switch SWMAIN, the photometric switch SWS, the release switch SWR, the exposure mode switch SWMODE, the drive switch SWDRIVE, the exposure correction switch SW ± EF, the ISO sensitivity setting switch SWISO,
Clear switch SWCL and hold switch SWHOLD
Are connected.

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

The IPU 43 knows the ON / OFF state of each switch SW by inputting the level of each input port PC, PB, and executes the processing according to that state. IPU4
A Tv electronic dial 17 is connected to the pair of three input ports PA0 and PA1, and an 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 known click stop rotation structures. That is, for example, at the click stop position, the pair of ports PA0 and PA1 are in a floating state, and from this position, the electronic dials 17 and 19 are connected.
When is rotated to the left or right, one of the pair of ports drops to “L” level first, then both drop to “L” level, and then “L” level first, depending on the direction of rotation. The structure that returns to the floating state first falls. Since the order of 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 viewfinder display member 71
Are connected. This LCD display panel 69 is an IP
Under the control of U43, the exposure mode, the shutter speed Tv, the aperture value Av, the information related to shooting such as the number of shots, the drive mode, and various conditions (ISO sensitivity information, exposure correction ± EF information, etc.) are displayed. The in-finder display member 71 includes display elements 71a and 71b for identifying the shutter speed Tv, aperture value Av, under, over, and proper 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 a flow chart. The shutter speed Tv, aperture value Av, subject brightness Bv, and other values used in the following arithmetic processing are all values for apex arithmetic.

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

When the photometric switch SWS is turned on while the main switch SWMAIN is turned on, power is supplied to the CPU 41 and this flow chart is entered. CPU41
First initializes each port P in step (hereinafter abbreviated as “S”) 11, and further R in S12.
Initialize AM41b. 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 communicates with the IPU 43 and receives data such as the set photographing exposure mode and exposure factor from the IPU 43 (S16). Then, the CPU 41 calculates the exposure factor by executing the exposure calculation according to the rule of the selected photographing 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 to execute S1.
Exposure factor (shutter speed T
v and aperture value data is sent to the IPU 43 (S1
9).

When the exposure factor is obtained, the process proceeds to S20 to check whether the release switch SWR is ON, and if it is ON, release process (exposure, exposure,
(Processing such as film winding) is executed (S21), and when the power is off, the process returns to S13 and the processes of S13 to S20 are repeated while the power is held.

"Communication processing with IPU" The CPU 41
Communication is performed with the PU 43 in order to exchange various data. The communication will be described with reference to the timing chart shown in FIG. 6 and the command example 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 will be performed. I
When the PU 43 monitors 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 is 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 the reception of the command, R
The CPU 41 is informed that the reception has been completed by deactivating the EADY terminal. Then, CPU41 of ^- SCK
^The data corresponding to the received command is output to the DATA terminal or the data is received from the CPU 41 in synchronization with the clock signal sent from the -terminal.

When the transmission and reception of the required data are completed by the above communication processing, the IPU 43 lowers the READY terminal level. CPU41 which received this is CE
The terminal level is lowered and CPU communication is terminated by IPU43.
Let me know. When the IPU 43 monitors that the CE terminal level has dropped, it activates the READY terminal and
PU communication is ended.

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

In this AE processing, first, the DX code relating to the ISO speed is converted into an apex value (film speed Sv) (S50). The DX code relating to ISO sensitivity is composed of 5 bits, and in this embodiment, DX pins (DX4, DX3, DX2, DX5, DX) contacting each code are connected.
This is read by 5 bits of 6). Here, the upper 3 bits (DX4, DX3, DX2) of the DX code form an integer part, and the lower 2 bits (DX5, DX6) form a decimal part. Then, the decimal part is, for example, "01", "1".
If it is "1", the apex value is converted into 0/3, if it is "10", the apex value is converted into 1/3, and if it is "00", it is converted into an apex value 2/3 and added to the integer part. For example, in the ISO100 DX code, the integer part is "101" and the decimal part is "01".
The integer part has an apex value of 5, and the decimal part has an apex value of 0. Therefore, it is converted into Sv = 5.

Next, the subject brightness Bv is calculated by the formula BVD = Bv +
7 、 (BVD = BV + 7), subject brightness for calculation B suitable for calculation
Convert to VD (S51). Further, the film sensitivity Sv and the exposure correction value Xv (XV) are respectively expressed by the formula SVD = Sv
-1, (SVD = SV-1), XVD = 4-Xv, and (XVD = 4-XV) are converted into calculation sensitivity SVD (SVD) and calculation exposure correction value XVD (XVD) suitable for calculation. S52).

The above processing is performed by the exposure factor for calculation (BVD, S
VD, XVD) values are prevented from becoming negative, and the accuracy of each exposure factor is adjusted to 1/8 Ev steps, and the apex operation of addition and subtraction is facilitated without considering the accuracy of the operation. is there. Since Sv and Xv have an accuracy of 1 / 3Ev, they cannot be accurately converted into 1 / 8Ev steps. Therefore, 1 / 3Ev is converted to 3 / 8Ev by rounding.
Perform processing for approximating v to 2 / 3Ev to 5 / 8Ev.

Then, the photometric correction amount MND based on the variation of the open F number is calculated (S53). This photometric 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, for example, the change of the open F number (change of the lens brightness) due to zooming. This is a unique value. The photometric correction amount MND is input from the photographing lens by IPU-lens communication, which will be described later, and is input from the IPU 43 to S16.
Is transferred to the CPU 41 by the CPU-IPU communication of
It is used in the PU 41.

Next, the calculation brightness BVD and the calculation sensitivity S
The calculation exposure value LVD (LVD) is calculated by the following formula 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, preparation for 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 properly set, 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 set to the maximum value 22.
AVDT, TV set to 5 to convert the calculation aperture value AVD and the calculation shutter speed TVD into values 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 changed to either or both of the calculation shutter speed TVMIN and the calculation minimum aperture value AVDMIN.

"Exposure calculation subroutine" In this embodiment,
As the exposure mode, a normal program (Prog) that automatically sets the shutter speed and aperture value based on the photometric results
ram) Automatic exposure mode, which automatically sets the aperture value from the manually set shutter speed and photometric result Lens-auto shutter speed priority (EE LA) Automatic exposure mode, automatically sets the shutter speed from the manually set aperture value and photometric result Aperture priority to be set (ES LA) Auto exposure mode, 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) with valve exposure mode.

Further, in the present embodiment, a limited program (Program LIMT) automatic exposure mode and a hyper program (Hyper Program) as a specific program exposure mode are used.
It has an automatic exposure mode, a lens shutter 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 flow charts shown in FIGS. “Hyper Program” The hyper program exposure mode of this embodiment is an exposure mode in which the mode can be freely changed between the program mode, the EE automatic exposure mode, and the ES automatic exposure mode. That is, by operating the electronic dials 17 and 19 and the clear button 23, the exposure mode can be freely changed among the 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 processing other than the switching of the exposure mode is the same for 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 its program diagram. Here, first, the relationship between the calculation TVD (TVD) value corresponding to the Tv value and the calculation AVD (AVD) value 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 4/8) 4 (Av) / 8) = TVD + AVD Further, here, Ev = Bv + Sv-Xv + MND TVD = Tv + 5 4/8 (1) AvD = Av + 4 4/8 (2). Therefore, according to the equations (1) and (2), Tv-T
The relational expressions of VD and Av-AVD are obtained. Here, the constants 5 4/8 and 4 4/8 are added to TVD and AVD, respectively, but it is only necessary to add these constants to a value of 10. In the present embodiment, it has been decided that the values are almost the same. The Tv-TVD correspondence table and the Av-AVD correspondence table obtained by the above equations are shown in Table 2 and Table 3, respectively.

[Table 2]

[Table 3]

In this program exposure mode, first, S
Calculate the optimum calculation shutter speed TVD by the calculation exposure value LVD calculated in 54 and the following program calculation formula, TVD = 3/8 LVD +4 6/8, and based on this, calculate the optimum calculation aperture value AVD. Ask (S61-S
78). The above equation can be obtained by substituting Tv = 3/8 Ev + 3 (the basic equation of the program line) for TVD = Tv + 5 4/8 and AVD = Av + 4 4/8. The optimum calculation shutter speed TVD and the optimum calculation aperture value AVD are
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 range of the aperture capacity of the taking lens (the maximum aperture value AVDMAX (AVDMAX for calculation) ) And the minimum aperture value AVDMIN (AVDMIN) for calculation), the optimum values are held, and the EE pulse number PN that holds the aperture of the taking lens at the optimum aperture value Av at the time of release is calculated. (S62, S64 to S66, S68, S69, S
72). The maximum shutter speed TVDMAX here means the highest shutter speed, and the minimum aperture value AVDMIN means the maximum aperture value.

Maximum and minimum shutter speed TVMAX (TVMAX),
TVMIN (TVMIN) is a value specific to the camera body 11,
In this embodiment, TVMAX = 13 (1/8000 seconds), TVM
IN = -5 (30 seconds). Therefore, the maximum for arithmetic,
The minimum shutter speeds TVDMAX and TVDMIN are calculated by the formula TVD = Tv
By +5 4/8, it can be 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 previously stored 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 for calculation AVDMAX,
AVDMIN is a value represented by the maximum and minimum aperture values AVMAX and AVMIN, which are peculiar to the taking lens, and the equation, AVD = Av + 4 4/8, and AvDMAX = AVMAX + 4 4/8 AvDMIN = AVMIN + 4 4/8. Maximum and minimum aperture value AVMA
X and AVMIN are input by the lens communication of S35 in the lens communication, and the calculated maximum and minimum aperture values AVDMAX and AVDMIN are stored in predetermined addresses of the internal RAM 41b of the CPU 41.

When the subject is too bright or too dark, the proper exposure factor does not fall on the program line, and therefore the following processing is performed.

(When too bright) Shutter speed T for calculation
When VD is larger 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 optimal calculation aperture value AVD is within the aperture capacity 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 maximum aperture value AVDMAX for calculation, and the optimum shutter speed TVD for calculation is calculated again (S65 to S68). When the recalculated calculation shutter speed TVD is higher than the calculation maximum shutter speed TVDMAX, proper exposure cannot be obtained no matter how the calculation shutter speed TVD and the calculation aperture value AVD are combined. Since it is out of the range, Ev that identifies that it is out of the interlocking range
The outside bit is set to "1" and the calculation shutter speed TVD is changed to the calculation maximum shutter speed TVDMAX, and then the EE pulse number PN is obtained (S69 to S72).
If the recalculated calculation shutter speed TVD is within the shutter performance range, proper exposure is possible.
The processing of S71 is skipped, and the EE pulse number PN is obtained based on the optimum calculation aperture value AVD (S69, S72).

When the Ev external bit is set, the shutter speed display (maximum shutter speed TVMAX) and aperture display (maximum aperture value AVMAX) of 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 minimum calculation aperture value AvDMIN, the calculation aperture value AvD is changed to the minimum calculation aperture value AVDMIN, and then the optimum calculation shutter speed TVD is set. When the values are re-obtained, these values are held when they are within the shutter capability range, and the EE pulse number PN is set to 0 because the diaphragm is open (S73 to S75, S78).

If the optimum calculation shutter speed TVD is smaller than the calculation minimum shutter speed TDVMIN, underexposure occurs, so the Ev external bit is set to "1" and the calculation shutter speed TVD is set to the calculation minimum shutter speed. After setting TDVMIN, the EE pulse number PN is set to 0 (S75 to S78).

After the above processing is completed, the aperture value for calculation A
VD and shutter speed TVD for calculation are set to IPU4
Aperture value for transfer AVT (AVT) to facilitate the process in 3
, 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 the data of 1/2 Ev step. That is, CPU4
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
Now, since these values are used only for display, 1/2 Ev
This is because the accuracy of steps is sufficient. In Tables 2 and 3 above,
An example of display divisions corresponding to TVD and AVD is shown.

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

[Limited Program Exposure Mode] FIG. 1
1 is the minimum and maximum shutter speed TVD1 for calculation by the photographer.
(TVD1), TVD2 (TVD2) and the minimum and maximum aperture values AVD1 (AVD1), AVD2 (AVD2) for calculation are shown in the subroutine of the limited program (automatic exposure) exposure mode. The flow of this subroutine is the same as the subroutine of the program exposure mode, but the minimum and maximum aperture values AVDMIN (AVDMIN) and AVMAX (AVDMAX) for calculation are replaced by the minimum and maximum aperture values AVD1 and AVD2, respectively (S8).
5, S93, S86, S87), 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 this limited program exposure mode is as shown in FIG.

The minimum and maximum shutter speeds T for these calculations
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 the 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 hypershutter priority (EE) automatic exposure mode, and the alternate long and short dash line in FIG. 10 is a diagram thereof. The basic process regarding the exposure factor calculation in the hyper shutter priority automatic exposure mode is common to the process 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 which is forcibly changed when the Tv electronic dial 17 is operated while the hyper program exposure mode is selected. The hyper EE automatic exposure mode is returned to the hyper program exposure mode by turning on the clear button 23 or turning off the power supply, 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 1/2 Ev step data, and the calculation shutter speed TVD
1/8 Ev Perform digit alignment on step data. Next, the 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 optimum calculation aperture value AVD is out of the aperture ability range, that is, when the subject is too bright or too dark, the following processing is performed. (When it 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, but this change results in overexposure. After setting the Av continuous bit for identifying that the value Av is out of interlocking, the EE pulse number PN is set (S103, S106 to S110). Av outside
When the bit is set, the aperture value display element of the LCD display panel 69 flashes Av "22" to indicate that it is overexposed.

(When it is too dark) If the optimum calculation aperture value AVD is smaller than the minimum calculation aperture value AvDMIN, 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). With the above processing, FIG.
The diagram indicated by the one-dot chain line at 0 is obtained.

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 (AVDT, TVDT), and the processing is ended. (S11
1, S112).

[Hyper ES Automatic Exposure Mode] The first embodiment of the lens auto hyper aperture priority (ES) automatic exposure mode will be described based on 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 the same as the processing of the conventional ES automatic exposure mode of lens auto (body set).

The hyper ES automatic exposure mode in this embodiment is an ES automatic exposure mode which is forcibly changed by operating the Av electronic dial 19 when the hyper program exposure mode is selected. In addition, the hyper ES automatic exposure mode is returned to the hyper program exposure mode by turning on the clear button 23, turning the power off / off, and the like, and the hyper EE automatic exposure mode is set to T.
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 the calculation aperture value AVD (AVD) (S131). Here, the relationship between the transfer aperture value AVT and the calculation aperture value AVD is AVD = AVT. The transfer aperture is 1/2 Ev
This is the step data, and the digit is aligned with the 1/8 Ev step data of AVD, which is the aperture value for calculation, simultaneously with the 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 performance range, the above values are held and the EE pulse number PN is calculated based on the calculation aperture value AVD (S133,
S134, S138-S140).

When the optimum calculation shutter speed TVD is out of the shutter capability range, that is, when the subject is too bright or too dark, the following processing is performed. (When it is too bright) If the optimum calculation shutter speed TVD is higher than the maximum calculation shutter speed TVDMAX, the calculation shutter speed TVD is changed to the maximum calculation shutter speed TVDMAX, but this change results in overexposure. After setting the Tv outside bit that identifies that the speed Tv is out of the shutter capability, the EE pulse number PN is set (S133, S136 to S140).

(When it is too dark) If the optimum calculation shutter speed TVD is smaller than the calculation minimum shutter speed TVDMIN, the calculation shutter speed TVD is changed to the calculation minimum shutter speed TVDMIN, but this change causes underexposure. Therefore, after the Tv external bit is set, the EE pulse number PN is set to 0 (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).
Through the above processing, the diagram shown by the broken line in FIG. 10 is obtained.

[Second Hyper EE / ES Automatic Exposure Mode] The second hyper EE / ES automatic exposure mode in the present embodiment is the priority when the overexposure or the underexposure is obtained only by changing the non-priority exposure factor. This mode changes the exposure factor. In the hyper EE and ES automatic exposure modes described above, the aperture value or the shutter speed that has been set preferentially is not changed when the subject is too bright or dark, whereas the second hyper EE and ES in the present embodiment are not changed.
The automatic exposure mode is a mode in which the priority exposure factor is changed when overexposure or underexposure is caused only by changing the non-priority exposure factor.

In the second hyper EE and ES automatic exposure mode, when the over-exposure or under-exposure occurs with the shutter speed or aperture value set as the priority, the shutter speed or aperture value set by the priority is set as the proper exposure. The direction is changed to (see FIG. 15 and FIG. 18). The processing operation of the second hyper EE automatic exposure mode will be described based on the flowchart shown in FIG. 14, and the processing operation of the second hyper ES automatic exposure mode will be described based on the flowchart shown in FIG.

In the second hyper EE automatic exposure mode, first, by operating the Tv electronic dial 17, the set shutter speed TVT stored in the IPU 43 is read and converted into the calculation shutter speed TVD, and this value TVD and the calculation exposure are calculated. The optimum calculation aperture value AVD is calculated with the value LVD (S121, S12).
2). If the optimal 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 subject is too bright and the optimum aperture value for calculation AVD
Is larger than the maximum aperture value AVDMAX for calculation, the optimum aperture value AVD for calculation is changed to the maximum aperture value AVDMAX for calculation, and then S132 is entered (S123 to S125, S127). The subject is too dark and the optimum calculation aperture value AVD is the minimum calculation aperture value A.
When it is smaller than VDMIN, this optimum aperture value for calculation A
After changing VD to the minimum aperture value for calculation AVDMIN, the process proceeds to S132 (S123, S125 to S127).

When S132 of the hyper ES automatic exposure mode (aperture priority automatic exposure mode) is entered, the calculation shutter speed TVD is recalculated and the shutter speed changing process is performed.

By the above processing, the solid line in FIG.
Since the diagrams indicated by the one-dot chain line and the two-dot chain line are obtained, the proper exposure range is expanded. It also works in shutter-priority automatic exposure mode within a certain range,
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 the aperture value for operation AVD, and this value and the exposure value for operation are calculated. The optimum calculation shutter speed TVD is calculated based on LVD (S151, S
152). If the optimal calculation shutter speed TVD is within the shutter performance range, the value is held and the process enters S102 of the hyper EE automatic exposure mode (FIG. 13) (S1
53, S155, S157).

When the subject is too bright and the optimum calculation shutter speed TVD is higher than the maximum calculation shutter speed TVDMAX, the optimum calculation shutter speed TVD is changed to the maximum calculation shutter speed TVDMAX and then the shutter priority automatic exposure mode is set. S102 (S153 to S155,
S157).

When the subject is too dark and the optimum calculation shutter speed TVD is smaller than the calculation minimum shutter speed TVDMIN, the optimum calculation shutter speed TVD is changed to the calculation minimum shutter speed TVDMIN, and then step S102 is entered (S1).
53, S155-S157). When S102 is entered, the aperture value for calculation AVD is calculated again, and the aperture value is changed (S103 to S112).

By 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 expanded. It should be noted that this can be considered as a kind of program automatic exposure mode that functions in the aperture priority automatic exposure mode within a certain range.

The first and second hyper EE and hyper ES automatic exposure modes described above have been described as being separate, but they can be implemented in the same camera. That is, E2 included in the IPU 43
2 bits in the exposure mode data of the PROM 43c may be associated with the first / second method in the hyper EE and hyper ES automatic exposure modes. These data are
Transferred to the CPU 41 by IPU communication, hyper EE,
If the above two bits are judged after the hyper ES is judged, the first or second hyper EE or hyper ES automatic exposure mode can be switched.

[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 the operation on the camera body 11 side, will be described with reference to the flowchart shown in FIG.

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

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

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 into the calculation aperture value AVD and the calculation shutter speed TVD, respectively, and the process proceeds to S167. (S161 to S163).

At step S167, the exposure value (AVD + TVD) based on the calculation aperture value AVD equal to these set values and the calculation shutter speed TVD equal to the set value, and the proper calculation exposure value LVD based on the actual photometry are calculated from The exposure error ΔEv is calculated by the following formula. ΔEv = LVD- (AVD + TVD)

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

When the exposure error ΔEv is larger than the permissible value, the exposure display element 71 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.
Set only the fixed point LED under bit to turn on (S168, S170, S172). In this embodiment, the allowable value of the exposure error ΔEv is less than ± 3/8 Ev, but this value can be set arbitrarily, and the values on the over side and the under side may be different. Further, the latitude of the loaded film may be read from the DX code and this may be set as the allowable value.

Then, based on the calculation aperture value AVD, EE
The number of pulses PN is calculated (S173, S174, S17
5), calculation aperture value AVD and calculation shutter speed TVD
To the transfer aperture value AVT and the transfer shutter speed TVT, respectively, and the process ends (S176, S17).
7).

As a result of 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 become appropriate values according to the photometric value (subject brightness Bv) in the program exposure mode. Since it is changed, you can quickly and manually set the proper exposure value with a simple operation. In addition, in the present embodiment, while the clear button 23 is turned on, the configuration is such that the proper exposure factor is continuously calculated.
The proper exposure factor may be 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 or not the clear button 23 has changed from off to on.

[Second LA Hyper Manual Exposure Mode] In the above processing, when the clear button 23 is turned on, Tv and A measured by the program automatic exposure mode are measured.
In the example, the value is changed to the v value, but only one of the exposure factors (shutter speed Tv or aperture value Av) may be changed to an appropriate value. Further, since it is in the manual exposure mode, it is possible to set the value to the Tv and Av series values even if it is not the proper exposure value Ev. Here, since the step of the apex value set by the calculation of the CPU 41 is smaller than the step of the manually settable apex value with the values of the Tv and Av series, the calculated apex value can be manually set by the apex. A value rounded to the value step.

Whether the proper value setting or the series value setting is performed is determined by the E2PROM 43.
It is determined by 1 bit in the hyper manual select flag of c. In the present embodiment, as shown in FIG.
If the bit is “0”, it is a series value setting, and if it is “1”, it is an appropriate value setting. Also, the type of automatic exposure mode is determined by the 1st bit and the 2nd bit of the 2nd bit in the flag. Note that this bit may be set at the time of shipment of the camera or may be set or changed by the photographer.

FIG. 24 is a flow chart showing a combination of an example in which at least one of the above exposure factors is changed to an appropriate value and an example in which the appropriateness / series is changed by using the data of the hyper manual select flag of the E2PROM 43c in the IPU 43. Although the data of the E2PROM 43c is stored in the RAM 43b of the IPU 43 during operation, 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 process proceeds to S603 (S60
1). In S603, Tv and Av for LA hyper manual based on the hyper manual select flag data
Check the change mode of. Here, bits 1 and 2 of the hyper manual select flag data correspond. If the value of 2 bits is "0", the process proceeds to the program automatic exposure mode process (S605), if it is "1", the process proceeds to LA aperture priority automatic exposure mode process (S607), and if it is "2", the LA shutter priority automatic exposure mode If it is "3", the exposure mode process is not performed and the process proceeds to S61.
Go 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 series / property
Check the bit (S611). If this value is "0", it goes to the series value setting process (S613), and if it is "1", it is an appropriate value process, so the process directly goes to the Manual-1 subroutine. Since the appropriate value process is the same as that in the first embodiment, the process in the case of a series value will be described. S605, S60
7. Performing AVTD and TVTD processes after the processes of S609 and S609 means that the proper values for calculation TVD, A
Despite obtaining VD, the display shutter speed TVT and the aperture value AVT calculated based on these values (S60
5, the final TVDT and AVDT processes in the subroutines of S607 and S609), the shutter speed for calculation TVD (S613) and the aperture value for calculation AVD (S61) are calculated again.
This is equivalent to recalculating 5). By this processing, the calculated proper shutter speed TVD and aperture value AVD which have been obtained once are converted into the calculation series shutter speed TVD and aperture value AVD. The processing after S167 is exactly the same as that of the first embodiment.

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

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

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

When the clear button 23 is not turned on, the transfer shutter speed TVT (1/2 Ev step value) sent from the IPU 43 is directly converted into the calculation shutter speed TVD and the process proceeds to S185 (S181). ,
S182).

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

At S185, the calculation aperture value AVVRD (AVVRD) is calculated from the AD conversion value AVA / D of the aperture value Av set by the aperture ring of the taking lens 65 and the adjustment value AVADJ (AVADJ) peculiar to the camera body 11. calculate. Then, based on these values, the exposure error ΔEv is calculated by the equation ΔEv = LVD−TVD−AVVRD−MND (S186).

If this exposure error ΔEv is within the allowable range, the fixed point LED over bit and under bit are set, if it is larger than the allowable value, the fixed point LED over bit is set, and if it is smaller than the allowable value, the fixed point LED under bit is set.
Set (S187 ~ S191). And the EE pulse number 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 is terminated (S192, S193). The EE pulse number PN is set to the maximum value so that the aperture mechanism of the camera body 11 is driven completely to the aperture stop position so that the aperture value set by the aperture ring of the taking lens 65 is surely stopped down. This is because.

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

[LM Aperture Priority Automatic Exposure Mode] Next, the lens manual aperture priority (ES) exposure mode in which the aperture is set by the aperture ring of the taking 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 taking lens 65 and the adjustment value AVADJ specific 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). Then, if the calculation shutter speed TVD is within the shutter performance 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, after changing to this (S203, S20)
4) If it is smaller than the minimum shutter speed TVMIN for calculation, change it to this (S203, S205, S20).
6), after setting Ev external bit, EE pulse number PN
Is set to the maximum value (S207 to S208).

Finally, the shutter speed for calculation TVD is set to IPU.
The transfer shutter speed TVT is transferred to S43, and the process ends (S209).

[LA, LM Bulb Exposure Mode] Next, the bulb exposure mode will be described with reference to the flow charts shown in FIGS. In the case of lens exposure bulb exposure mode, first, Av electronic dial 19
The transfer aperture value AVT set by is read by the CPU-IPU communication and converted into the calculation aperture value AVD (S2).
11). Then, the EE corresponding to this calculation aperture value AVD
The number of pulses PN is calculated and set (S212, S21
3) Then, the fixed point LED under bit and over bit are reset, the arithmetic aperture value AVD is converted again to the transfer aperture value AVT, and then the processing 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 lens manual bulb exposure mode, as shown in FIG. 23, the EE pulse number PN is set to the maximum value to enable the aperture to be set to the aperture value set by the aperture ring of the taking lens. The fixed point LED under bit and over bit are reset and the processing ends.

"IPU Main Routine" Above is CPU4
The processing of No. 1 was described, but the processing of the IPU 43 will be described next. First, the main operation of the IPU 43 will be described with reference to the flowchart shown in FIG. Note that the internal RAM 43b of the IPU 43 has been sent by manually setting the aperture value Av and the shutter speed Tv, the display aperture value Av and the shutter speed Tv, the selected exposure mode, communication with the CPU 41, and lens communication. 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 when the battery is turned on, the IPU-MAIN of FIG. 26 is executed. First IPU43
Initializes the port and the RAM 43b, and initializes various modes (S220 to S222).
Next, the initial exposure mode is set. This is I
It is decided based on the state of the port PL0 of the PU 43. In the lens auto mode, the hyper program exposure mode is set, and in the lens manual mode, the aperture priority automatic exposure mode is set.

Next, the intermittent process by the 32 ms timer is repeated (S223 to S229-2). The IPU 43 executes the following process in this intermittent process. When the 32ms timer times out, input the switch input, that is, the levels of the switch input ports PC0 to PB5 in order,
When the voltage has fallen to the “L” level (when it 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. The lens data is written and the lens data is input to the IPU 43 by lens communication (S223 to S225). If the time is not up, jump to S228 (S223,
S228).

Next, it is checked whether or not the main switch SWMAIN is turned on, and if it is turned off, Hyp
Clear the -Tv flag and the Hyp-Av flag,
Turn off power hold (turn off main power 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 the photometric switch SWS is turned on, it is considered that the photographing operation has started or is in progress. Therefore, after starting the photometric timer and turning on the power hold to operate the CPU 41, S2
28, but (S226, S227-1, S227-
2, S228), if the photometric switch SWS is not turned on, skip the photometric timer start and power hold-on processing and proceed to S228 (S226, S22).
7-1, S228).

In step S228, information such as aperture value (F) and shutter speed (S-1) information used for shooting in the selected shooting mode is displayed on the LCD panel 69 and the viewfinder display unit 7.
Display in 1. Then, it is checked whether or not the photometric timer has timed out. If the time has expired, the power hold is turned off. If the time has not expired, the process directly returns to S223 (S229-1, S229-
2, S223).

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

"Communication Processing with Lens" Regarding the subroutine relating to communication with the lens CPU in S225,
This will be described with reference to FIG. First, the IPU43 is a pin CO
Mount pin information (open F number Fmin, maximum F number Fmax) by dropping NT to "L" level (logic "0")
And the auto / manual (A / M) information) (S31, S32). The previous application by the applicant (Japanese Patent Laid-Open No.
63-184719), 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 It forms the maximum F-number Fmax information. Further, an A / M switch SWA / M is connected to the pin A / M, and 1-bit aperture auto / manual information is formed by turning the A / M switch SWA / M ON / OFF.

The CPU 41 sets the pin CONT to logical "1".
Depending on whether the pin CONT level is set to "1" by reversing it to ("H" level), whether the auto AF lens KAF is attached or not attached and whether the lens is not attached or not Is determined (S33,
S34). The lenses that can be identified in this embodiment are a manual lens K without a mount pin, and an automatic lens KA with a mount pin but no lens ROM.
, Auto A with mount pin and lens ROM
There are three types of F lens KAF.

If the pin CONT is "1", the taking lens 6
The lens communication is executed with the camera 5 and the lens data is input (S34, S35). And mount pin Fmax1
If the levels of ~ 2 and Fmin1 to 3 are all "1" and the 5-bit lens type bit is "1 1 1 1 1", it is considered that the lens ROM has failed, so no lens NoLens bit is set. Set and return (S3
6, S37, S38). Mount pins Fmax1 to Fmax2,
Even if only one level of Fmin1 to Fmin3 is "0", the lens type input through 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).

Lens manual and pin Fmax
If the levels of 1 and 2 are "1 1" and the levels of the pins Fmin1 to 3 are "1 1 1", the taking lens is not mounted, so the lensless NoLens bit is set and the process returns (S
43, S44).

Lens manual and pin Fmax
If the levels of 1 and 2 are "0 0" and the levels of the pins Fmin1 to 3 are "0 0 0", it is the manual lens K, so the manual lens KLens bit is set and the process returns (S).
45, S46).

If the pins Fmax1 and max2 and the pins Fmin1 to min3 are not all "1" or "0", the auto lens KALens set in the lens manual is set, so the auto lens KAlens bit is set and the process returns (S41, S).
43, S45, S42).

By the above processing, the IPU can be used for determining the lens type, various lens information, and lens auto / manual.
It is set in the memory 43 and is further transferred to the CPU 41.

FIG. 28 shows a subroutine of the switch input processing 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 subroutine are shown)
The processing is executed in the process (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 dialing process] FIGS.
The flowchart of the subroutine regarding the electronic dial processing of S227 and S228 is shown. This subroutine is interrupted when the Tv, Av electronic dials 17, 19 are rotated in either direction and any of the ports PA0, A1, A2, A3 becomes "0".
, Av Dial change bit is set (S271, S28
1).

When the Tv electronic dial 17 is rotated, a detection process of the direction in which the Tv electronic dial 17 is rotated is executed (S272). That is, when the Tv electronic dial 17 is rotated clockwise, the port PA0 is first set to "0".
Since the port PA1 remains "1", the right rotation bit is set, and when it is rotated counterclockwise, the port PA1 will be "0" first.
Since 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-S284).
These electronic dial change bit and right rotation bit are used in later Av and Tv electronic dial set processing, exposure mode selection processing and the like.

[Tv, Av electronic dial set] Next,
The processing of the IPU 43 when the electronic dials 17 and 19 are rotated while the specific exposure mode is selected will be described with reference to the subroutines shown in FIGS. 31 and 32. The specific exposure mode in this embodiment is a program, limited program, hyper program, EE automatic, lens automatic ES automatic or manual exposure mode. Further, in the present embodiment, the shutter ability of the camera body is 30 seconds to 1/8000 seconds (T
v = −5 Tv to +13 Tv), and the aperture capacity is the open F number Fmin read from the taking lens.
The range is from (= Avmin) to the maximum F number Fmax (= Avmax), and for the sake of simplification 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. If it is "0", the process directly returns. If it is "1", it is checked whether the right rotation bit is set (S401, S40).
2). If the clockwise rotation bit is set (Tv electronic dial 19 is rotated clockwise), the shutter speed Tv is added in 1 / 2Tv units until the maximum shutter speed Tvmax is reached (S4).
02, S403, S404). If the right rotation bit is reset (Tv electronic dial 17 is rotated left), the shutter speed Tv is halved until it reaches the minimum shutter speed Tvmin.
Subtract in Tv units (S402, S405, S40
6). Then, the Tv dial change bit is cleared, and T
v Reset the right rotation bit and return (S40
7).

On the other hand, in the Av dial check,
If the Av electronic dial 19 is rotated to the right, aperture value A
v is added in units of 1/2 Av (until the maximum aperture value Avmax is reached) (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 set to 1/2 A.
Subtract by v (until the minimum aperture value Avmin) (S
411, S412, S415, S416). And A
The v dial change bit is cleared, the Av rotation bit is reset, and the process returns (S418).

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

[Mode Shift Process] The mode shift process is a process of changing the IPU mode relating to the exposure mode to the CPU mode. That is, this is a process of changing the IPU mode to the CPU mode when the IPU 43 has the IPU mode NO. To be used in the IPU 43 and the CPU mode NO. Table 4 shows the relationship between the IPU mode NO. And the CPU mode NO.

[Table 4]

This mode shift processing will be described with reference to the flowchart shown in FIG. IPU43
Checks whether the lens aperture mode is automatic or manual, and if it is manual, sets the CPU mode to the lens manual mode and returns (S62).
1, S623). 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 8 and the process returns. When the hyper Tv flag is set, the CPU mode is set to "8" and the process returns (S621, S625, S62).
7). When the hyper Av flag is set, the CPU mode is set to "7" and the process 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 32 ms timer intermittent process (when the exposure mode switch SWMODE is turned on).
Then, it is processed as one subroutine in the SW-IN processing (S224). And changing the exposure mode
This is performed by operating the Tv electronic dial 17 while the exposure mode / drive lever 29 is slid to the MODE side. The exposure mode numbers and the corresponding exposure modes are
As shown in Table 4 above. This mode-in process will be described in more detail with reference to the flowcharts shown in FIGS. 34A and 34B. It should be noted that Hyper EE and Hyper ES do not have independent mode No. but have the same exposure mode No. (14) as Hyper Program, Hyp-Tv,
It is identified by the Hyp-Av flag.

The photographing lens in this embodiment has an auto / manual switch SWA / M by rotating the lens aperture ring. However, when the auto / manual switch SWA / M is manual, the aperture is set to the lens. Set by the side. Therefore, when it is determined that the lens is manual in S241, the process proceeds to S242, and the exposure mode is set 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.
Select from 0). The initial state is LM
It is the aperture priority automatic exposure mode (exposure mode NO. 2).

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

When the Tv electronic dial 17 is rotated counterclockwise (when the clockwise rotation bit is "0"), the exposure mode is set to L.
M throttle priority → LM hyper manual → LM valve → L
It cyclically changes one by one in descending order of M aperture priority, resets the Tv dial change bit, and then jumps to a check subroutine (S241 to S247, S251).

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

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

"Check Subroutine" In the check subroutine, as shown in FIG. 34, when any of the NOLensbit, the hyper Av flag and the hyper Tv flag is set, the hyper Av flag and the hyper Tv flag are lowered and then the mode display processing is performed. And then return. The Hyper Tv flag and Hyper Av flag are
It is an alternative to the AE mode. That is, instead of putting 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, during hyper EE, the hyper program (NO.14) in the AE mode type and the hyper Tv flag are set, and during hyper ES, the AE
The hyper program (NO.14) and the hyper Av flag in the mode type are set. On the contrary, Hyper E
To return from the E or hyper ES mode to the hyper program mode, the hyper Av flag or the hyper Tv flag may be reset. With this check subroutine, the hyper Av flag and hyper Tv flag are always reset in the case of lens manual, so when the auto / manual switch SWA / M is switched from manual to auto, or the taking lens is once removed. When reattached, the exposure mode is initialized to the hyper program exposure mode.

When the taking lens is an auto lens and therefore the auto / manual switch SWA / M is switched to auto, the exposure mode switch SW
The exposure mode is set as follows: PROGRAM → HYPER PROGRAM → LIMITED PROGRAM → …… → LA valve → when the MODE is on and the Tv electronic dial 17 is rotated counterclockwise.
The program is cyclically changed one by one in the order of program →, and the display processing is performed (S241, S251 to S257, S264). When the Tv electronic dial 17 is rotated to the right, the exposure mode is cyclically changed one by one in the ascending order opposite to the above, and the display processing is performed (S258 to S260, S264).

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

When the clear button 23 is turned on, when the exposure mode is hyper EE or hyper ES, these are initialized to the hyper program mode, and in other exposure modes, the mode is maintained as it is.
That is, since the Hyper Tv flag or the Hyper Av flag is set in the Hyper EE or Hyper ES automatic exposure mode, these are reset (S).
261, S263). As a result, 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 hyper EE and hyper ES automatic exposure modes are selected by operating the electronic dials 17 and 19 while the hyper program exposure mode is selected. That is, when the electronic dials 17 and 19 are rotated while the hyper program is selected, the hyper Av flag or the hyper Tv flag is set, and the hyper EE or hyper ES automatic exposure mode can be forcibly changed. When the hyper EE or hyper ES automatic exposure mode is selected, it is possible to forcibly change to the hyper ES or hyper EE automatic exposure mode by operating the electronic dials 17 and 19. Further, by turning on the clear button 23, the hyper EE / hyper ES automatic exposure mode can be forcibly changed to the hyper program exposure mode. The above-mentioned forced change display is executed in the exposure mode display processing described later.

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

Here, the aperture auto and manual information (A / M terminal) that can be switched by the aperture ring of the taking lens are
For example, when the mode is auto (“0”), the exposure mode is determined by the 3 bits for lens auto mode and the Hyp-Tv, Av flags, and when the mode is manual (“1”), the exposure mode is determined by 2 bits for the lens manual mode. To do. Then, it is sent to the CPU 41 as 4-bit exposure mode data which is a combination of the auto and manual exposure modes. The correspondence relationship 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 the present embodiment means that the exposure value Ev is locked when the hold button 25 is pressed once, and the exposure value Ev is pressed when the hold button 25 is pressed twice.
Unlock the. That is, every time the hold button 25 is turned on and off, the exposure value Ev is locked and released repeatedly. In this memory lock process, for example, 3 bits in the memory lock flag data in the RAM 43b are used. As shown in FIG. 38, 1 bit is the ML mode flag (hold bit), 1 bit is the current hold switch data, and the remaining 1 bit is the old hold switch data. All of these data are cleared in the initial state.

Regarding the memory lock process of 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 each 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 put 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”). Although the hold switch 25 is a normally open self-reset type, the processing time of the microcomputer is usually very short. Therefore, while the photographer is turning on the hold switch 25, this memory lock processing subroutine is executed a plurality of times. Let's pass.

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

In S651, it is checked whether or not the ML mode flag is set. If it is set, the ML mode flag is cleared, and if it 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 is set. Hold switch 2
Since it is set when 5 is turned on, S6
The program proceeds to step 59, where it is cleared when it is turned off, so the procedure directly proceeds to the ML mode display processing.

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

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

When the mounted lens is automatic, S
In step S302, the following display processing is performed. [Hyper-program exposure mode] Although the hyper-program exposure mode is set, the electronic dial 17, 1
When none of 9 is operated, "HY P" indicating the hyper program exposure mode, initial value "Tv 8oo" of shutter speed Tv (1/8000 seconds), aperture value A
The initial value of v "Av 5.6" (F5.6) and the number of shots "22" (22) are displayed on the LCD panel 69 in the manner shown in FIG. 42B, and the initial shutter speed Tv and aperture value Av are set. Display unit 71 for each value
Is displayed on the screen (S302 to S308).

Then, the IPU 43, on condition that the CPU 41 is in the power hold state, calculates the optimum shutter speed Tv (transfer shutter speed TVT) calculated by the CPU 41 in the hyper program exposure subroutine and the optimum aperture value Av (transfer aperture value). AVT) read and RAM43b
After setting (memory) at a predetermined address of, 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 viewfinder display unit 71 depending on the power hold condition.

When the Tv electronic dial 17 is being operated (when the Tv dial change bit is "1"), the hyper Tv flag is set, the hyper Av flag is set down, and the hyper EE automatic exposure mode is selected (S303). , S31
1). Then, the shutter speed Tv is changed according to the operation of the Tv electronic dial 17, and the changed value is set in a predetermined address of the RAM 43b to indicate that the hyper EE automatic exposure mode is set, the set shutter speed Tv, and the like.
LCD panel 69 and viewfinder display unit 71
Are displayed in the manner shown in FIG. 42G (S312, S313). The initial value of the set aperture value Av Av is a value calculated in the hyper program exposure mode or the hyper EE exposure mode. In addition, a 3/4 circle surrounding the display "Tv" on the LCD panel 69, an acute-angled triangular arrow pointing to the left and right arranged above it, and an underline of the display "4oo" on the viewfinder display unit 71 are Tv. It is displayed that the shutter speed Tv can be changed by rotating the electronic dial 17.

Further, on condition that the CPU 41 is in the power hold state, the CPU 41 reads the optimum aperture value Av calculated by the hyper EE automatic exposure subroutine (receives it at the time of communication), sets it in the RAM 43b, 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 is being operated (when the Av dial change bit is "1"), the hyper Av flag is set and the hyper Tv flag is lowered to select the hyper ES automatic exposure mode ( 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.
42b, the hyper ES automatic exposure mode and the set aperture value Av are displayed on the LCD panel 69 or the like.
It is displayed in the manner shown in 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. In addition, a 3/4 circle surrounding the display "Av" on the LCD panel 69 and an arrow below the circle, and the display unit 7 in the finder.
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 in power hold, the CPU 41 reads the optimum shutter speed Tv calculated by the hyper ES automatic exposure subroutine, sets the value in the RAM 43b, and displays it on the LCD panel 69 or the like (S319, S320). ).

The IPU 43 uses the electronic dial 17,
Even if none of 19 is operated, if 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 optimum transfer shutter speed TVT and aperture value A
The VT is set in the RAM 43b and displayed on the LCD panel 69 or the like, but the aperture value Av or the shutter speed Tv is not changed (S303 to S305, S313 to S313).
315 or S303 to S306, S319 to S320).

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

Further, when the clear button 23 is turned on, the hyper EE automatic exposure mode or the hyper ES automatic exposure mode is changed to the hyper program exposure mode, and the hyper electronic E is turned by operating the Av electronic dial 19.
The E automatic exposure mode can be changed to the hyper ES automatic exposure mode, and the Tv electronic dial 17 can be rotated to change the hyper ES automatic exposure mode to the hyper EE automatic exposure mode. As described above, in this embodiment, when the hyper program exposure mode is selected, by operating the electronic dials 17 and 19 or the clear button 23, the diagram shown by the solid line, the alternate long and short dash line and the broken line in FIG. 10 can be easily obtained.

As already described in the explanation of the flow charts of FIGS. 33 and 34, the hyper Tv
, Av flags, when the clear button 23 is turned on (S261 to S263), when the hyper program exposure mode is selected in the mode selection process, when the main switch SWMAIN is turned off, and when the taking lens is removed. When it is released and then returned to the original state, it is initialized to the hyper program automatic exposure mode.

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

[Limited Program Exposure Mode] In the limited program exposure mode of the present embodiment, the photographer sets the upper and lower limits of the shutter speed and the aperture value, which change along the program diagram, by 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 25. When the limited program exposure mode is selected, a message to that effect is displayed on the LCD panel 69 by lighting 3/4 yen surrounding "Av" and "Tv" in the display mode of FIG. 40C (S461, S46).
2).

When the clear switch SWCL is turned on, the limit shutter speeds TV1, TV2 and the limit aperture values AV1, AV2 are initialized (S463-1, S4).
63-2). The initial values of the limit shutter speed and the limit aperture value in this embodiment in the limited program exposure mode are the lower limit shutter speed TV1 = TVMIN = 3.
0 (seconds), 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 battery is loaded and the limited program exposure mode is first selected, but when the clear switch SWCL is off, the limit shutter speeds TV1, AV2 are set.
And limit aperture values AV1 and AV2 without initializing the values,
Proceed to check 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 turned on, or when the photometering switch SWS is turned off and the power is held, the process proceeds to S485 without doing anything (S464, S4).
65-1). Metering switch SWS is turned off and CP
When the power hold of U41 is turned off, the limit value is changed 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 RA
After setting to M43b and displaying on the LCD panel 69 or the like, the process returns, and if the power is not held, the process returns without doing anything (S486).

The limit value changing process after S465-2 is executed as follows. First, Tv electronic dial 1
When 7 is operated, the limit shutter speed Tv is increased / decreased according to the operation status of the Tv electronic dial 17.
The display is lowered, 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 and
Set TV2. That is, if the ON operation of the hold button 25 is the first or odd number of times, 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 time or the even number of times, 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 is not turned on, nothing is changed (S467, S485).

On the other hand, when the Av electronic dial 19 is turned on, the limit aperture value changing process is performed in the same manner as the limit shutter speed Tv changing process. That is, according to the rotation direction of the Av electronic dial 19, the aperture value A
The up / down processing and display of v and the setting processing to the RAM 43b are performed (S475, S476). When the hold button 25 is turned on, the hold button 25 is turned on for the first or odd times (ML mode flag =
In the case of 1), the Av value set data is changed to the lower limit aperture value Av1, and at the second time or even number of times (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 limit shutter speeds TV1, TV2,
When the change processing of the limit aperture values AV1, AV2, etc. is completed, the CPU 41 reads the optimum shutter speed Tv and the optimum aperture value Av calculated in the limited program exposure mode on condition that the CPU 41 is in power hold, and the RAM 43b. Set to (S485, S4
86). The value set in this way is displayed on the LCD panel 6
It is displayed on 9th grade. 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 the upper and lower limit shutter speed and aperture value.
7, skip the processing of S477, the electronic dial 17, 1
The above limit value can be changed every time 9 is operated.

[LA ES automatic exposure mode] Body set aperture priority (ES) automatic exposure mode (Lens Auto E
When the (S automatic exposure mode) is selected, the fact is displayed on the LCD panel 69 in the manner shown in FIG. 42D (S).
301, S302, S321, S461, S331-S
333). When the Av electronic dial 19 is rotationally operated, the aperture value Av that has been raised or lowered according to the operation is set in the RAM 43b as the set aperture value Av and displayed on the LCD panel or the like, and the CPU 41 is power-held. At the same time, 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 it in the RAM 43b, and further displays it on the LCD panel 69 or the like (S334).
~ S338).

[LA EE automatic exposure mode] When the shutter priority (EE) automatic exposure mode is selected, that effect and the initial value (1/8000 seconds) of the shutter speed Tv are
It is displayed on the LCD panel 69 or the like in the manner shown in FIG. 42C (S301, S302, S321, S331, S341).
~ S343). When the Tv electronic dial 17 is rotationally operated, the shutter speed Tv that has been raised or lowered according to the rotational operation is set in the RAM 43b as the set shutter speed Tv and displayed on the LCD panel 69 or the like, and the CUP 41 holds the power. If the shutter speed TVT set in the shutter speed priority automatic exposure mode is sent to the CPU 41,
41 reads the optimum transfer aperture value AVT calculated in 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 manner shown in FIG. 42C (S3
44-S348).

[Hyper manual exposure mode] In the hyper manual exposure mode of this embodiment, the clear button 2 is used.
By the operation of 3, the shutter speed Tv and / or the aperture value Av is a mode in which an effect equivalent to that 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 LCD panel 6 indicates this fact.
9 and the like 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 up and down in response to the rotating operation of the electronic dials 17 and 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 rotationally operated, the shutter speed Tv or aperture value Av that has been raised or lowered according to the rotation is set, and if the power is held, the CPU 41 is set in the manual exposure mode. The selected shutter speed TVT and aperture value AVT are sent out, the CPU 41 reads the fixed point LED bit calculated by the body set manual exposure subroutine, and sets it in the RAM 43a.
Lighting control of a and 71b is performed (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 mode 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 according to this rotation is set to RA.
It is set in M43b and displayed on the LCD panel 69 or the like (S363 to S365).

As described above, the shutter priority of the body set is given,
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" together with a 3/4 circle and a triangle mark, and the in-viewfinder display unit 71 has a shutter speed T.
Since an underline is displayed below the display of v or the aperture value Av, it can be visually and easily 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 in-viewfinder display unit 71
Since the display element 71c ("*") is turned on, it can be surely understood that the memory is locked.

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

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

Further, if the CPU 41 is in the power hold state, the shutter speed Tv TVT and the aperture value AVT selected in the manual exposure mode are sent to the CPU 41, and the CPU 41 reads the fixed point LED bit set in the LA manual exposure subroutine. The exposure display elements 71a and 71b are set in the RAM 43b and lighting control is performed (S377, S378). In FIG. 43A, (a) indicates that the exposure is proper, (b) indicates that it is overexposed, and (c) indicates that it is underexposed.

[LM manual ES automatic exposure mode]
When the lens manual aperture priority (ES) automatic exposure mode is selected, the fact is displayed 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 power hold, the CPU 41 reads the shutter speed TVT calculated in the ES manual exposure subroutine of the lens manual and RA
It is set in M43b, displayed on the LCD panel 69, etc. and returned (S384 to S385).

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

[EV Check Subroutine] The EV check of this embodiment is operated when the hold switch 25 is turned on to lock the proper exposure value at that time, and then when the electronic dials 17 and 19 are rotated. One exposure factor (shutter speed or aperture value) is raised or lowered according to the operation, while the other exposure factor (aperture value or shutter speed) is lowered or raised so that the locked exposure value does not change. is there. In the EV check subroutine in S352, the hold button 25
Electronic dial 1 provided that is turned on.
Each time 7 and 19 are rotated by one step, the shutter speed TV and the aperture value AV are increased / decreased in units of 1/2 TV and 1/2 AV. Regarding the operation of this EV check subroutine,
This will be described in more detail with reference to FIG.

The hold bit corresponding to ON / OFF of the switch linked to the hold button 25 is RA of the IPU 43.
M43b is provided. First, if this hold bit is "0", the hold button 25 has not been turned on, so the shutter speed TV and aperture value AV that have already been set are set and the process returns (S421, 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 leftward by one step (or more) (Tv change bit is "0"), the shutter speed TV is TV = -5 (30).
Seconds) or the aperture value AV is the maximum aperture value AVMAX
Until the shutter speed becomes, 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). Even when the AV electronic dial 19 is rotated to the right, the same processing as above is performed (S42).
2, S428, S429, S424 to S427).

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

By the above processing, by manually setting the proper shutter speed TV and aperture value AV and then turning on the hold button 25 once, any one of
The exposure value EV is set by operating the individual electronic dials 17 and 19.
With the shutter speed kept constant, the shutter speed TV and aperture value A
Both V can be changed at the same time. For example, in the hyper manual mode, assume that the shutter speed is 1/125 second and the aperture value F8.0 is the proper exposure value. When the hold button 25 is turned on in this state, the memory is locked first. Next, for example, by rotating the Tv electronic dial 17 in two steps, the shutter speed is changed to 1/60 seconds and the aperture is changed to F11 while the exposure value is fixed. This is clear from the fact that when the Tv dial is operated in the normal hyper manual exposure mode, only the shutter speed value changes and the exposure level changes. Further, this mode is released by turning on the hold button 25 once more.

"Second Exposure Mode Display Processing" 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 in the hyper program exposure mode, the electronic dials 17, 1
The exposure mode does not change unless 9 is rotated for two steps or more.

When the hyper program is selected in the lens auto mode, neither of the electronic dials 17 and 19 is rotated, and both the hyper TV and AV flags are down, the hyper program exposure mode. Therefore, the hyper TV flag and the hyper AV flag are cleared to set the hyper program exposure mode, and the LCD panel 69 and the in-viewfinder display unit 71 are displayed as shown in FIG. 42B (S501).
~ S508). Then, the transfer calculation shutter speed TVT and the transfer aperture value AVT calculated by the CPU 41 are input on condition that the CPU 41 is in the power hold state, and R
Set it in AM43b and return (S509, S510).

When the hyper EE automatic exposure mode is selected, the hyper TV flag is set, so the flow proceeds from S505 to S514, and from S514 to S518, S311 to S518.
The same processing as S315 is performed. On the other hand, when the Hyper ES automatic exposure mode is selected, the Hyper AV flag is set, so the process proceeds from S506 to S524, and from S524 to S524.
In S528, the same processing as 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 processes of the TV dial check and the AV dial check subroutines are performed. The TV / AV dial check subroutine is a process in which the exposure mode is not changed unless the TV / AV electronic dials 17 and 19 rotate in the same direction by two steps or more.

When the TV electronic dial 17 or the AV electronic dial 19 rotates by one step, or when it rotates by one step and then rotates by one step in the opposite direction, the process proceeds to S505 (S503, S511, S505 or S503, S
504, S521, S505).

When the TV electronic dial 17 is rotated in the same direction by two steps, the process proceeds from S511 to S512. Here, since the Hyper EE automatic exposure mode is not yet selected when the Hyper TV flag is set down, only the change to the Hyper EE automatic exposure mode is possible and the shutter speed T
Clear the TV dial change flag to disable V change and proceed to S514 (S512, S513, S514). When the Hyper TV flag is set, Hyper E is already
E Since the automatic exposure mode is selected, the process proceeds directly to S514 so that the shutter speed TV can be changed (S512,
S514).

On the other hand, the AV electronic dial 19 is set to 2 in the same direction.
After rotating by steps, 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 it is only possible to change to the Hyper ES automatic exposure mode.
Clear the AV dial change flag to disable V change and then 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, so the process proceeds directly to S524 so that the aperture value AV can be changed (S5
21, S522, S524).

The TV / AV dial check subroutine of S511 and S521 will be described in more detail with reference to FIGS. 45 and 46. In the TV dial check subroutine, it is first checked whether the TV dummy flag is set (S551). Since it is not standing for 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, when the direction of rotation of the TV electronic dial 17 is the same as the previous time (first time), the current and old TV
Since the contents of the dial direction flag 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,
When the direction of rotation of the TV electronic dial 17 is different from that of the first time, the contents of the current TV dial direction flag are different. Therefore, the TV dial dummy flag is lowered, and the current TV dial direction flag is inserted in the old TV dial direction flag. And proceed to S505 (S551, S553, S554).

In the AV dial check subroutine,
First, it is checked whether the AV dummy flag is set (S561). Since it is not standing for 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 direction of rotation of the AV electronic dial 17 is the same as at the time of the first time, since the contents of the old AV dial direction flag are the same, the AV dial dummy flag is set and the TV dial dummy flag is lowered. Proceed to S524 (S563, S565). On the other hand, at the time of the second processing, when the rotation direction of the AV electronic dial 17 is different from that at the first processing, the contents of the old AV dial direction flag are different at present, so the AV dial dummy flag is lowered and Put the AV dial direction flag into the old AV dial direction flag and proceed 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 steps or more. On the contrary, the exposure mode does not change. The electronic dials 17 and 19
It is also possible to adopt a configuration in which the mode is not forcibly changed when is continuously rotated in a short time.

As described above, in this embodiment, when the hyper program exposure mode is selected, the electronic dial 1
By simply rotating 7 and 19, the shutter speed TV or the aperture value AV corresponding to each rotating operation direction 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 automatic exposure mode, e-dial 1
Since the shutter speed or the aperture value can be changed by the operations of 7 and 19, when the photographer's intention cannot be sufficiently expressed in the program exposure mode, the automatic exposure mode that easily expresses the photographer's intention can be easily changed. be able to.

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

As described above, in the present embodiment, two automatic exposure modes are provided, which are the normal program exposure mode and the hyper program exposure mode in which the exposure can be changed to the automatic exposure mode in which the exposure factor has priority by operating only the electronic dials 17 and 19. ,
The present invention may have a configuration in which only the hyper program exposure mode is provided, or a configuration in which more than one type of program exposure mode is provided.

As described above, according to this embodiment, when the clear button 23 is turned on in the manual exposure mode, the shutter speed and the aperture value are calculated in the program exposure mode when the body is set. Can be set to an appropriate value. Moreover, while the clear button 23 is turned on, photometry is continued and the proper value is maintained. Further, when the clear button 23 is turned on in the manual exposure mode of the lens set, the shutter speed is changed to an appropriate value based on the subject brightness,
In addition, metering is continued and the proper exposure value is always maintained.

[0213]

As described above, according to the present invention, when the manual shift means is operated during shooting in the manual exposure mode, one of the exposure factors is always based on the photometric value while the manual shift means is operated. Since the change is made so as to hold the proper exposure value, it becomes possible to easily hold the proper exposure value in the manual exposure mode. Moreover, when the manual shift mechanism is released, the initial manual exposure mode is restored, so if you want to temporarily leave the manual exposure mode, or if you want to quickly set an exposure factor that gives the correct exposure value, or temporarily This is convenient when you want to maintain a proper exposure value.

[Brief description of drawings]

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

FIG. 2 is a rear view of the 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 the CPU.

FIG. 6 is a timing chart regarding CPU-IPU communication.

FIG. 7 is a flowchart regarding an automatic exposure mode.

FIG. 8 is a flowchart regarding error processing.

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

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

FIG. 11 is a flow chart of an embodiment of a limited program exposure mode of the present invention.

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

FIG. 13 is a flowchart of an embodiment of a hypershutter speed priority automatic exposure mode of the present invention.

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

FIG. 15 is a diagram showing an embodiment of the hypershutter speed priority automatic exposure mode of FIGS. 13 and 14;

FIG. 16 is a flow chart of an embodiment of a 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.

FIG. 19 is a flowchart regarding an embodiment of a hyper aperture priority automatic exposure mode of the present invention.

FIG. 20 is a flowchart regarding an LA manual exposure mode.

FIG. 21 is a flowchart showing an LM manual exposure mode.

FIG. 22 is a flowchart regarding an LA valve exposure mode.

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

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

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

FIG. 26 is a flowchart showing the main operation of the IPU.

FIG. 27 is a flowchart regarding communication between the IPU and the taking lens.

FIG. 28 is a flowchart relating to switch input processing.

FIG. 29 is a flowchart of Tv electronic dial processing.

FIG. 30 is a flowchart of Av electronic dialing processing.

FIG. 31 is a flowchart of processing for changing the aperture value Av using an Av electronic dial.

FIG. 32 is a flowchart relating to shutter speed changing processing by the Tv electronic dial.

FIG. 33 is a flowchart relating to mode shift processing.

34A],

FIG. 34B is a flowchart relating to exposure mode selection processing.

FIG. 35 is a flowchart of check processing.

[Fig. 36] Fig. 36 is a diagram illustrating a configuration example of data in a RAM in an IPU.

FIG. 37 is a flowchart of a memory lock process.

FIG. 38 is a diagram showing a configuration example of a memory lock flag in the RAM of the IPU.

FIG. 39A]

FIG. 39B]

FIG. 39C]

39D]

FIG. 39E]

FIG. 39F],

[FIG. 39G] FIG.

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

FIG. 40 is a flowchart relating to Ev check processing of the present embodiment.

FIG. 41A],

FIG. 41B]

FIG. 41C],

41D],

FIG. 41E]

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

42A] FIG.

42B]

42C] FIG.

42D]

FIG. 42E]

42F]

42G] FIG.

[Fig. 42H] Fig. 42H is a diagram showing a display manner of different exposure modes of the LCD panel and the in-finder display unit.

FIG. 43A]

FIG. 43B]

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

FIG. 44A]

FIG. 39N is a flowchart relating to the second example of the display processing relating to 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 viewfinder display unit

Front page continued (72) Inventor Toshiyuki Kitazawa 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Kogaku Kogyo Co., Ltd. (72) Inventor Takayuki Izumi 2 36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Kogaku Industrial Co., Ltd. (72) Inventor Masato Yamamoto 2-36 Maeno-cho, Itabashi-ku, Tokyo Asahi Kogaku Co., Ltd. (72) Inventor Toshinoma Yamanaka 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Kogaku Industrial Co., Ltd. (72) Inventor Takenao Shishikura 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Gakkou Industrial Co., Ltd. (72) Akio Takahashi 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Kogaku Industry Co., Ltd.

Claims (2)

[Claims] 1. A photometric means for measuring subject brightness; first and second manual setting means for independently setting a shutter speed and an aperture value as a pair of exposure factors; at least one of the pair of exposure factors An automatic exposure mode in which one is automatically set and exposed according to the subject brightness by the photometric means; and a manual exposure mode in which one is exposed by the pair of exposure factors manually set by the first and second manual setting means. And a manual shift means for setting the exposure factor set by the first and / or second manual setting means based on the subject brightness measured by the photometric means when operated in the manual exposure mode. While the manual shift means is being operated, the photometry by the photometry means is continued, and An exposure control device for a camera, comprising: exposure value calculation means for continuing the proper exposure value calculation operation based on the photometric value of the photometry means. 2. The exposure of a camera according to claim 1, wherein in the manual exposure mode, when the operation of the manual shift means is turned off, the final calculation result of the exposure value calculation means is held. Control device.