JPS6258488B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camera, and more particularly to a shutter speed selection circuit for selecting a shutter speed for flash photography of a camera.

In flash photography using a camera with a focal plane shutter, the flash time of the electronic flash device (hereinafter referred to as a strobe) is very short, so the shutter speed set is the strobe synchronized shutter speed or a slower shutter speed. It has to be speed.

Conventionally, the shutter speed has been manually set, but in such cases, the setting may sometimes be forgotten, and proper photographs may not be taken.

Therefore, by applying a signal from the autoflash flash side to the camera side to automatically set the shutter speed during flash photography to the strobe synchronized shutter speed, for example 1/60 second or 1/90 second, it is possible to always take proper flash photography. A system has been proposed that allows this.

However, this method has the disadvantage that a backlit subject located next to a window will be underexposed because the light adjustment operation by the auto-adjustable strobe responds to the intensity of light from the window.

The purpose of the present invention is to solve the drawbacks of the above-mentioned conventional devices,
It is an object of the present invention to provide a camera that can prevent slit-like improper exposure caused by forgetting to set the shutter speed during flash photography, and can also properly expose a subject in a backlit state.

The present invention will be explained in detail below using the drawings.

FIG. 1-A shows an outline of the configuration of the present invention, and FIG. 1-B is a flowchart thereof.
In order to make it easier to understand, the following explanation will refer to Section 1-B.
The flowchart shown in the figure will be explained with further supplementary explanations.

In FIGS. 1-A and 1-B, when an electric signal indicating a semi-automatic mode is supplied from the strobe, the first generating means generates a semi-automatic strobe photographing mode signal in response to the signal. When the mode signal is generated, the camera enters the semi-automatic mode, and the strobe synchronized shutter speed data from the second generation means is
TSYN is read into the A register. Then, the manual shutter speed data DTTV from the third generating means is subtracted from the data TSYN by the A register, and a comparison is made to see which one is larger. This comparison is performed by detecting the carry of the A register, and when DTTV>TSYN, the manually set data DTTV is transferred to the shutter seconds storage register via the gate means, while
When DTTV<TSYN, data TSYN, which is data relating to the shutter speed necessary for the focal plane shutter to fully open, is transferred to the shutter seconds storage register via the gate means and stored therein. Further, when the shutter speed priority AE photography mode is in effect and the semi-automatic strobe photography mode signal is not generated from the first generating means, the manual shutter speed signal DTTV (in the shutter speed priority AE photography mode) outputs the gate means. It is stored in the shutter second time storage register via the shutter speed.

Therefore, when the shutter is released in the subsequent sequence, if the manually set shutter speed is intentionally set to a low speed due to backlight conditions, etc., data DTTV will be released in semi-automatic strobe shooting mode.
Shutter speed control based on this is executed by the shutter speed control means. On the other hand, even if the shutter speed is manually set to a higher speed than the strobe synchronized shutter speed due to the photographer's carelessness, the shutter speed control will still be controlled by the data corresponding to the strobe synchronized shutter speed.
It is executed based on TSYN, and full shutter opening is guaranteed.

In addition, in the daylight photography mode state where the semi-automatic flash photography mode signal does not exist, the data
Shutter speed control based on DTTV is performed.

Next, FIG. 1 shows an example of a strobe that is applied to the camera system of this embodiment.
is a front view, b is a rear view, and c is a bottom view. This strobe has a well-known automatic light adjustment function, but is also unique in that it has an information exchange function with a camera device.

In the figure, reference numeral 102 is a light emitting unit that emits a flash of light up to the limit of the light emitting ability of this strobe. Further, reference numeral 104 denotes a light detection unit that detects reflected flash from the subject in order to dim the flash of the light emitting unit 102. The automatic light adjustment method applied to this strobe is such that when taking a photo, the strobe is emitted and the light emitting unit 102 emits light toward the subject, and at the same time, the light detecting unit 104 detects the reflected light from the subject. The purpose is to provide an appropriate amount of exposure to the film surface by photometry and stopping the light emission from the light emitting section 102 when the total amount of reflected light reaches a predetermined value. In addition, in order to perform such automatic light adjustment,
The sensitivity of the film to be used and the aperture value of the photographic lens must be given in advance as setting information, and a film sensitivity setting dial 106 and an aperture value setting dial 108 are provided for this purpose. Depending on the rotation of the dial 106, the dial 106
The film's ASA sensitivity display 120 appears in the window 118 provided above, and the desired ASA sensitivity display 120 is indicated by the indicator 1 provided on the dial 106.
By setting the value to 22, the film sensitivity setting is completed.

132 is a power switch, and charging of the capacitor is started by turning on this switch.
The bottom of the strobe shoe 134 is equipped with a synchronization contact 138, a control signal contact 140, and a data signal contact 142.
2, are electrically connected to the control terminal 54 and the data terminal 56, respectively. Furthermore, each part of the shoe 134 is provided with a ground terminal 144, which is grounded to the accessory shoe body when the strobe is attached.

When taking pictures using strobe light, the shutter speed at which a camera equipped with a focal plane shutter can perform exposure in synchronization with the strobe light emission is called strobe synchronization shutter speed.
TSYN is generally on the slow side, less than 1/60th of a second or 1/125th of a second, but it is common to make a mistake in setting this when operating the camera, and when setting the shutter speed for flash photography. Doing so may impede its operability, and some countermeasures have been required. On the other hand, the strobe used in this embodiment is not a passive system that simply issues a warning in case of erroneous operation;
An active method is used in which the shutter speed required for flash photography is controlled from the flash side. Prior to shooting using strobe light,
There was a fully automatic system that automatically turned off the shutter at the strobe synchronized shutter speed TSYN no matter what shutter speed was set on the camera, and the shutter speed on the camera was set to a higher speed than the strobe synchronized shutter speed TSYN. A semi-automatic method can be considered in which the shutter is automatically turned off at the strobe synchronized shutter speed TSYN only when the camera is in use, and in the shutter speed range smaller than this strobe synchronized shutter speed TSYN, the shutter is turned off at the shutter speed set on the camera device side. However, in this embodiment, a fully automatic method or a semi-automatic method is appropriately selected and adopted. The switch 146 provided on the back of the strobe body is used to select between the fully automatic method and the semi-automatic method.

Note that the signal for determining the switching position of the changeover switch 146 is given as a signal containing two pieces of information from the control contact 140 to the control terminal 54 of the accessory shoe, along with a signal indicating that charging of the strobe is completed. This means that when a voltage is applied from the control terminal 54 on the camera side to the control contact 140 on the strobe side, the current value flowing through the changeover switch 14
This is possible by setting it differently depending on the switching position of 6. Furthermore, each of these two pieces of information is
It will be given to the camera side according to the AND condition with the information indicating that the strobe has completed charging.
Therefore, when the strobe is not fully charged, no signal is transmitted to the camera side. Now, if a signal indicating that strobe charging is completed is given as the first information, it will be captured by the camera as a signal indicating full automatic mode, and a charging completion signal will be given as the second information. If this occurs, it will be captured by the camera as a signal indicating semi-automatic mode. Depending on the first or second information signal from the control terminal 54, this camera enters the strobe photography mode, and the shutter speed is the strobe synchronized shutter speed, or the manually set second is the strobe synchronized shutter speed. In the case of a slower speed, a manually set time (in the case of semi-automatic mode) lower than the synchronized shutter speed is selected, and at the same time, data on the aperture value or full light emission is taken in from the data terminal 56.

This data terminal 56 has an aperture setting dial 1.
The information set by 08 is given as an analog value. In other words, in the automatic light control mode, as mentioned earlier, information about the aperture value of the lens is essential, and although this was configured to be set on the strobe side, this setting value can also be directly set on the camera side. In order to generate the aperture control signal, a transmission system is required. For this purpose, a data contact 142 is provided on the strobe side, and a data terminal 56 is provided on the camera body side. Now, when a charging completion signal is input to the camera side, the camera takes in analog information regarding the aperture value from the data terminal 56, and performs aperture control according to that information.

The operation of this strobe will be explained in more detail with reference to FIG. In the figure, reference numeral 342 is the automatic light adjustment type strobe unit explained using Fig. 1, which controls the amount of light emitted according to the light reflected from the subject.The element for controlling the amount of light is the film sensitivity. Film sensitivity information from the setting dial 106 and aperture value information from the aperture setting dial 108 are used. The configuration of the strobe unit 342 is well known, so a detailed explanation will be omitted, but in order for the strobe unit 342 to emit strobe light, a discharging capacitor (not shown) must be charged to a required voltage. Must be.
When the capacitor is fully charged, the strobe unit 342 becomes capable of emitting light.
4, a signal indicating completion of charging of the discharging capacitor is output. This signal is introduced into the current circuit 346, and at this time, the current circuit 346 selects a first current amount signal as a fully automatic charge completion signal and a second current amount signal as a semi-automatic charge completion signal, depending on the state of the changeover switch 146. It becomes possible to receive the two current amount signals from the control contact 140. Note that when the first current amount or the second current amount can flow from the control terminal 54 to the control contact 140, the camera detects this and automatically switches to strobe photography mode. However, there is an unillustrated device built into the camera body.
Instead of the analog information from the TTL side optical system, the circuit switches to a circuit that converts the analog information from the data terminal 56 into digital data and takes it in. As mentioned earlier,
When the camera switches to strobe photography mode in response to the first current amount (fully automatic charging completion signal), the shutter speed is automatically controlled to 1/60th of a second, no matter what shutter speed is set on the camera body. In addition, when the camera switches to strobe photography mode based on the second current amount (semi-automatic charging completion signal), if the shutter speed is set to 1/60th of a second or more on the camera body side, For a limited time, it will be automatically controlled to 1/60th of a second. On the other hand, the data terminal 56 transmits data regarding the aperture value set by the aperture setting dial 108 on the strobe side from the data contact 142 to the aperture setting dial 108.
It receives analog information through a level setter 348 that is directly connected to the level setter 348. This analog information is A
-D conversion is carried out and taken into the camera side as digital information, and used as data for aperture control.

In a camera that has entered strobe shooting mode by receiving a fully automatic or semi-automatic charging completion signal from the strobe side, when the shutter release is performed, the shutter movement of the camera body is transmitted to the strobe unit 342 through the synchronization contacts 52 and 138. A flash command is given in synchronization with the strobe light.
The unit 342 operates automatically, while the camera side performs shutter release at a shutter speed of 1/60th of a second or less (in the case of semi-automatic mode), and also adjusts the aperture according to the aperture value set on the flash side. Take control.

In the following explanation, the signal indicating the completion of fully automatic charging including the first current amount detected through the control terminal 54 will be referred to as the CSA1 signal, and the signal indicating the completion of semi-automatic charging including the second amount of current will be referred to as the CSA1 signal. CSA2 signal,
In addition, these two signals indicating that charging is complete are also displayed.
Collectively called CSA signals. Also, the data regarding the aperture value input through the data terminal 56 is sent to the VSA.
Collectively called signals.

Next, the functional configuration of the mechanical parts of the camera used with the strobe device shown in FIG. 2 will be explained using the schematic configuration diagram of FIG. 3.

The output analog signal of the TTL photometry means 378 is transmitted through the signal switching circuit 380 of the input control section 360.
The data is supplied to the -D converter 382, converted into digital data, and then taken into the system. Note that the signal switching circuit 380 is connected to other means than the TTL photometry means 378, that is, the strobe device 38.
This is provided in order to share the A-D converter 382 when converting the analog data from 4 to a digital value.

A simple block diagram of the strobe device 384 is shown in FIG. 2. When the strobe device 384 is attached to the camera body, the data contact 142, control contact 140, and synchronization contact 138 of the strobe device 384 are connected to the camera. It contacts each of the data terminal 56, control terminal 54, and synchronization contact 52 provided on the accessory shoe of the body. In this state, when the power switch 132 (FIG. 1) of the strobe device 384 is turned on, data VSA regarding the aperture value set by the aperture setting dial 108 is input from the data contact 142 through the data terminal 56, and the data is inputted to the input control unit. 360 signal switching circuit 380. In this state, if charging for strobe light emission is not completed in the strobe device 384, the signal CSA indicating charging completion is not input, and therefore, the input of the data VSA is regulated by the signal switching circuit 380. becomes. When charging of the strobe device 384 is completed, the control terminal 54 is connected to the control contact 140 on the strobe device 384 side.
Through this, current can flow into the current detection circuit 386. That is, from the strobe device 384 to the control contact 1
40, a signal indicating completion of charging through the control terminal 54;
CSA is input in the form of a negative current signal, and this signal
CSA is the current detector 3 provided in the input control section 360
86.

When current flows out from the control terminal 54, this current detector 386 gives a control signal to the signal switching circuit 380, and converts the analog signal input from the terminal 56 to A instead of the analog signal from the TTL photometry means 378. -D converter 382, and a function of detecting the magnitude of the current and determining a control signal included in the amount of current. Therefore, when the signal CSA indicating the completion of charging is inputted from the strobe device 384, the signal switching circuit 380 inputs data VSA regarding the aperture value inputted as an analog value from the terminal 56 to the A-D converter 382. Therefore, the data VSA regarding the aperture value is converted into digital data and then taken into the system. On the other hand, the current detector 386 detects the CSA signal and sends a charging completion signal to set the system to strobe photography mode.
In addition to outputting CGUP, the changeover switch 146
(Fig. 1), a current circuit 346 (second
(Figure), two levels of current amount are selectively applied. According to the current amount of the CSA signal, the current detector 386 determines whether this strobe photography mode is fully automatic or semi-automatic, and when it is fully automatic, it outputs the fully automatic signal FAT. Output. Therefore, the input of the charging completion signal CGUP, which is the output of the current detector 386, and the fully automatic signal
Depending on the presence or absence of FAT, the system operates in fully automatic or semi-automatic strobe photography mode.

In addition, a strobe device 384 for strobe photography
The light emission trigger is performed by a synchro switch 388 provided on the mechanism part 358 (FIG. 3), but the strobe device 384 is triggered by a synchronizer contact 13.
8 and 52 to the switch 388. As is well known, in the case of a two-curtain focal plane shutter, the synchro switch 388 is turned on by a member 390 that detects when the front curtain has finished running.

This synchro switch 388 synchronizes not only the strobe device 384 attached to the accessory shoe of the camera body but also other general strobe or flash devices to configure the camera system of this embodiment. For this purpose, it is also connected to the X contact 64.

The data and condition setting signals taken into the input control section 360 as described above are transferred to the central control section 362 via the input bus line 370 after being appropriately time-aligned.

The central control section 362 takes in various setting data and setting conditions from the mechanism section 358.
This central control section 362 is connected to the timing line 39.
The timing pulse is output through 4,
In synchronization with this timing pulse, data SV ¹ related to film sensitivity SV, data AVo (gray code) related to the maximum aperture value AVo of the photographic lens device, and information indicating that the aperture of the photographic lens device is set on the lens device side are obtained. signal MNAL indicating that the photographing lens device is stopped down, data regarding the set aperture value AV or shutter speed TV, signal ASLC indicating that this data is related to the aperture value AV, photographing lens device. It takes in a signal such as AMAX that indicates what the minimum aperture value is.

In this central control section 362, various calculation controls are performed, and data signals for controlling each exposure control mechanism of the camera mechanism section 358 and data signals for display are outputted via an output bus line 374. 364.

This output control unit 364 performs shutter/release control to start the operation of the camera device, aperture control to control the aperture value of the lens device to a set or calculated aperture, and shutter speed to control the shutter speed to a set or calculated speed. It has various control functions such as speed control and display control for displaying necessary information, and includes a shutter release means 396, an aperture control means 398, a shutter speed control means 400, a digital display means 402, and a blinking function provided in the mechanism part 358. A control signal for display means 404 is output. On the other hand, this output control section 364 detects various setting conditions and operating states of the mechanical section 358, and also takes in those signals.
Release switch SW2 First curtain run start switch
Through SCTST, the SELF signal indicating that the self-timer is set, the shutter release SR signal to start the camera operation after the shutter release, and the front curtain of the two-curtain running type focal plane shutter are running. CTST indicating what was done
A signal is applied. Furthermore, the output control section 364
It also takes in the FPC signal obtained by converting the distance traveled by the AE lever 94 from the AE charge position into pulses.

The explanatory diagram in FIG. 7 is a diagram illustrating the relationship between each photographing mode based on the TTL photometry and external photometry described above and the calculation routines corresponding thereto.

FIG. 7 shows the state of the mode selector 38 (not shown) provided on the camera, the state of the aperture setting ring 8 (not shown) of the lens (not shown), and the state of the aperture setting ring 8 (not shown) provided on the camera, and the aperture lever 64A (not shown) provided on the camera. The photographing modes and four calculation routines used by this camera system are shown in relation to the state of (see) and differences in photometry methods.

On the other hand, as previously mentioned, this camera system has a function that works in close cooperation with an auto-flash type strobe, but next we will consider the case where this strobe device 384 is applied to photography. Try. After the strobe device 384 is attached to the accessory shoe of the camera device body and electrically connected to the body, the strobe device 384 is in a state where it can emit light, that is, when charging for light emission is completed. , the camera device switches to strobe photography mode.

At this time, various shooting modes can be adopted depending on how to set each condition of the camera and strobe device, but the calculations performed within the camera device in this strobe shooting mode can be roughly divided into four routines: These correspond to fully automatic, automatic light control, automatic mode, semi-automatic, automatic light control, automatic mode, fully automatic, full power flash, manual mode, and semi-automatic, full power flash, manual mode, but are mainly related to the present invention. Explains semi-automatic, automatic dimming, and automatic modes,
Explanation of the remaining modes will be omitted.

In the case of semi-automatic/automatic light control/automatic mode, the strobe device 384 is in a state where it can automatically control light emission according to the aperture value and film sensitivity set by the aperture setting dial 108 and film sensitivity setting dial 106. On the other hand, the camera side is provided with analog signal data VSA corresponding to the aperture value set by the aperture setting dial 108, and is also provided with a charging completion signal CSA. This charging completion signal CSA includes a control signal that depends on the amount of current for fully automatic and semi-automatic modes, but in semi-automatic mode, as explained earlier, this charging completion signal CSA includes a control signal for semi-automatic mode. , and the camera mode is set to give priority to shutter speed, which will be described in detail later.

In this case, first set the flash synchronization shutter speed TSYN on the camera body and dial 3 on the camera body.
Shutter speed TV set at 4 (see Figure 3)
A comparison operation is performed to determine which one is larger. As a result of this comparison calculation, the shutter speed on the lower speed side is set as the shutter speed TV for control.

Next, digitally converted aperture value data is imported from the strobe device 384 to the camera side.
Subtraction of constant CST2 corresponding to bias from VSA
Perform VSA-CST2=AV to derive control data AV regarding the aperture input from the strobe side. Furthermore, the aperture value AV obtained in this way
is the aperture setting dial 1 on the strobe device 384 side.
08, but sometimes this calculation result exceeds the limit of the aperture value that can be controlled by the lens, and in such cases, the photographer is notified of this to prevent erroneous operation. There is a need to. To this end, this camera system performs a comparison calculation to determine whether the aperture value AV set on the strobe device 384 side is less than the maximum aperture value AMAX that can be controlled by the lens and greater than the minimum aperture value AVo. If, as a result of such comparison operation, the aperture value
If AV exceeds the maximum aperture value AMAX or minimum aperture value AVo, the limit value AMAX or AVo
The aperture value AV set on the strobe device 384 side
Instead, the aperture value AV is used for control, but it goes without saying that at the same time an operation is performed to notify the photographer of this fact.

Next, the open aperture value AVo of the photographing lens is subtracted from the aperture value data AV for control as AV-AVo=AVs, and the number of aperture stages AVs for aperture control is calculated.

The operation of the camera and strobe device 384 in this semi-automatic/automatic light control/automatic mode has already been described above.

FIG. 4 shows more specifically the input control section 360, central control section 362, and output control section 364 in FIG.

This system is basically a clock pulse CP
It is controlled by the central control unit 3.
Also provided at 62 is a clock pulse generator 542.

This clock pulse CP is introduced into a system pulse generator 544, which clock pulse
Generating system pulses based on CP. System pulse is counter pulse CT1~
It consists of CT4 and timing pulses TB0 to TB7, etc.

The timing pulses TB1 to TB6 obtained from the system pulse generator 544 are applied to the driver circuit 54.
6, and timing pulses 1 to 6 are output from this driver circuit 546. These timing pulses 1 to 6 are applied to the digital display means 402 through a timing line 394 as digit pulses for dynamically driving the digital display means 402, and are also applied to the film sensitivity input mechanism 518, the open aperture value, MNAL, and the like.
SPDW signal setting input mechanism 522, AV/TV and
ASLC setting mechanism 528, maximum aperture setting mechanism 536
A timing pulse for data acquisition is provided to each of the mechanisms through a timing line 394.

520 is a set circuit for converting data input with 1/3 stop precision into data with 1/8 step precision, and the open aperture value/MNAL/SPDW setting mechanism 522 is configured to convert data AVo related to the open aperture value AVo of the lens. (Gray code) is extracted sequentially from the most significant digits.

For the open aperture value data AVo, data AVo (gray code) corresponding to the gray code is input from the open aperture value/MNAL/SPDW setting mechanism 522 sequentially from the upper digits in synchronization with timing pulses 3 to 6. .

Since the information inputted from the setting mechanism 522 also includes the MNAL signal and the SPDW signal, it is necessary to separate only the data AVo (gray code) related to the open aperture value AVo. The signal separation circuit 524 serves as the key to this purpose.
This signal separation circuit 524 is a timing pulse
Open aperture value AVo input in synchronization with 3 to 6
This separates the data AVo (Gray code) based on timing pulses, and the data AVo separated by this signal separation circuit 524
(Gray code) is converted into open aperture value data AVo through the next Gray code/binary code converter 526.

The maximum aperture value AVo of the photographic lens used above has a close relationship with the bending error AVc during wide-open metering, and when performing calculations for exposure control using wide-open metering, it is necessary to take this bending error AVc into account. be. This bending error AVc is the maximum aperture AVo of the shooting lens used.
However, in the system of this embodiment, corresponding bending error data AVc is prepared in advance for each open aperture value AVo that is considered to be input. The configuration is such that the bending error data AVc corresponding to the open aperture value AVo is selected and imported. The bending error data AVc is stored in the fixed data ROM 528, and is appropriately selected according to the input aperture value AVo, and is calculated from the timing pulse TB0.
This data is output sequentially from the lower digits as 1/8 step precision data synchronized with TB3.

The TV/AV/ASLC setting mechanism 528 also outputs the ASLC signal in synchronization with timing pulse 1 and the shutter speed TV or aperture value AV set by the dial 34 in synchronization with timing pulses 2 to 6, respectively. It can be taken out. The data from the setting mechanism 528 is the shutter speed TV.
There is no distinction between whether it corresponds to the aperture value AV or the aperture value AV. However, if this data is imported as shutter speed TV,
Whether the aperture value has been taken in is determined based on the aforementioned aperture setting signal ASLC, which is taken in synchronization with the 1 timing pulse. Note that the data is used together with the aperture setting signal ASLC.
The signal separation circuit 532 separates the data TV and AV which are taken in from the AV/TV/ASLC setting mechanism 528 and are taken in in synchronization with timing pulses 2 to 6 from among the output signals of the setting mechanism 528. It is. The data separated by the signal separation circuit 532 can be used as is as data AV related to the aperture value, but in order to use this data as data related to the shutter speed TV, it is necessary to double the data. This is because the minimum unit for setting the aperture value AV using the setting dial 34 (see Figure 3) on the camera is 1/2 stop, whereas the minimum unit for setting the shutter speed TV through the dial 34 is 1/2 stop. Since it is a single-stage shutter speed, the shutter speed TV is multiplied by 1/2 and set after matching the minimum unit of data with the aperture value AV, and later when this data is used as the shutter speed, it is configured to be doubled. are being taken. A doubling circuit 530 is used to achieve this purpose, and the data is
Data regarding the shutter speed is output through the doubler circuit 530 as data TV.

The maximum aperture value setting mechanism 536 does not generate the maximum aperture value data AMAX by itself, but selects and outputs the required maximum aperture value data AMAX from among a large number of fixed data stored in the fixed data ROM 534. It is something that makes you That is,
Data input from the maximum aperture value setting mechanism 536 in synchronization with timing pulses TB1 to TB6
AMAX' corresponds to six timing pulses TB1 to TB6 for each F number F11, F16, F22, F32, F45, F46 of the actual maximum aperture value AMAX, and therefore the maximum aperture value setting mechanism From 536,
After inputting and accumulating data serially into the serial input/parallel output register 538, and looking at which bit of the register 538 is outputting "1", the maximum aperture value AMAX of the photographic lens used can be determined.
It turns out whether it is F11, F16, F22, F32, F45, or F64. Therefore, the parallel output of the register 538 is led to the fixed data ROM 534, and when a signal specifying the maximum aperture value AMAX is input from the instruction ROM 504 (described later) to the fixed data ROM 534, the signal specified by the register 538 is input. This outputs the maximum aperture value AMAX.

In addition, the maximum aperture value AMAX is fixed data ROM5.
A specific configuration for deriving from .34 will be described in detail later.

On the other hand, the MNAL signal and SPDW signal input from the aperture value/MNAL/SPDW setting mechanism 522 in synchronization with the timing pulses TB1 and TB2 are introduced into the condition signal storage circuit 548, and both signals are inputted based on the timing pulse. It is stored after being separated. As a result, the MNAL or SPDW signal can be obtained from the condition signal storage circuit 548.

Also, input from the TV/AV/ASLC setting mechanism 528 in synchronization with the timing pulse TB1.
The ASLC signal is introduced into the condition signal storage circuit 548 where it is separated and stored based on timing pulses. As a result, the condition signal storage circuit 54
From 8 you can get ASLC signals or signals.

On the other hand, the condition signal storage circuit 548 stores timing pulses TB2 to TB6 in the signal classification circuit 532.
This is to determine when the valve mode is selected by the dial 34. That is, in this system, the valve mode is when all bits of the data set by the dial 34 are "0", and therefore, only "0" signals are generated during the predetermined timing pulses TB2 to TB6. If only one input is input, the valve mode is determined by detecting this fact. That is,
The condition signal storage circuit 548 has the function of detecting and storing when there is no "1" output from the output end of the signal discriminating circuit 532 during the predetermined timing pulses TB2 to TB6. This storage signal is output from the condition signal storage circuit 548 as a BLB signal indicating that the shutter speed is in bulb mode, or the opposite signal.

From the condition signal storage circuit 548, the mechanism section 3
Depending on the settings of various conditions in 58,
MNAL signal, signal, BLB signal, signal,
SPDW signal, signal, ASLC signal, signal will be output.

On the other hand, various data, condition setting signals, state determination signals, etc. are also input from the mechanism section 358 to the input control section 360.

The analog output from the TTL photometry means 378 or the analog signal input from the aforementioned terminal 56 is
The signal is selectively input to the A-D converter through the signal switching circuit 380 controlled by the current detector 386, and this A-D converter includes the reference level generating means 550 and the A-D conversion control circuit 552. , integrator 5
54, integrator control means 555, comparator 556, counter 558, flip-flop 560, 56
2, a buffer register 564.

This A-D converter is a well-known A-D converter commonly called a dual lamp A-D converter.
Since it is a converter, its explanation will be omitted here.

Note that the operating state of this A-D converter must always be detected by the system, and a logic circuit 566 is provided for this purpose. This logic circuit 566 takes in the output signals of the comparator 556 and flip-flops 560 and 562, and the input analog data is input to the integrator 554.
INT signal indicating that integration is in progress, A-D
ADCE signal indicates that the conversion has been completed and it is possible to transfer and read the A-D conversion data, and indicates that the input analog data is too large as a result of A-D conversion and the counter 558 has overflowed.
Output ADOF signal.

As described above, the analog data introduced from the mechanism section 358 to the input control section 360 is stored in the buffer register 564 as digital conversion data DD.
are sequentially transferred from the lower digits to the input bus line 370 as digital data synchronized with the timing pulses TB0 to TB7 through the signal switching circuit 568 based on the command from the logic circuit 566, and sent to the central control unit 362. will be forwarded to.

On the other hand, the INT output from the logic circuit 566
The signal is synchronized with timing pulse TB7, and the ADCE signal is synchronized with timing pulse TB6.
bus line 3 as a signal synchronized to
It will be put on the 66.

The terminal 54 of the mechanism part 358 receives the above-mentioned strobe charge completion signal CSA and the external photometry adapter.
A signal such as OLM indicating the mode is input, but
As mentioned earlier, these signals are transmitted to the current detector 3.
86, the CGUP signal indicates whether or not charging of the strobe is completed, the FAT signal indicates that the shutter speed is fully automatic when shooting with a strobe, and the OLM signal indicates that an external metering adapter is applied. be done. These signals are further processed by encoder 570
It is converted into two signals CU and AO. This CU
and AO signal means that when the CU signal is “0”, the system will perform exposure control based on photometry data, and at this time, if the AO signal is “0”, TTL photometry shooting will be performed. This will instruct the mode, and if it is "1", it will instruct the external photometry shooting mode. Also, when the CU signal is "1", it instructs the system to enter strobe photography mode, and at this time, if the AO signal is "0", it instructs the shutter speed to be controlled semi-automatically, and when it is "1", it instructs the system to perform flash photography mode. If so, it instructs the shutter speed to be controlled fully automatically. These signals CU and AO are applied to terminals a and b of multiplexer 572, respectively.

The multiplexer 572 has input terminals a~
f, and is configured to convert the input signal from the input terminal into a serial signal that is output in synchronization with the timing pulses TB1 to TB6. c, d, e of this multiplexer 572
Each terminal has an AE lock signal AELK,
AE charge signal AECG, winding completion signal
WNUP is applied to the f terminal of the logic circuit 5.
Signal indicating AD conversion overflow from 66
ADOF is given. As a result, this multiplexer 572 outputs timing pulses TB1~
ADOF signal, AELK in synchronization with each of TB6
signal, AECG signal, WNUP signal, AO signal, and CU signal will be output, and this serial signal will be output from the signal switching circuit 568 as the timing pulse TB1.
~Synchronized with TB6, sequential input bus line 370
and transferred to the central control unit 362.

Note that this signal switching circuit 568 is controlled based on a command from the logic circuit 566, and is activated when the A-D conversion of the input analog data is completed and the transfer of the A-D converted data becomes possible. At this point, the output of the buffer register 564 is transferred to the input bus.
line 370; in other conditions, the serial output signal of multiplexer 572 is applied to input bus line 370.

As described above, the analog data and various conditions or state determination signals taken into the input control section 360 from the mechanism section 358 are transferred to the input bus line 3.
70, signals ADCE and INT signals that are applied to the central control unit 362 and indicate the status of A/D conversion are placed on a bus line 366.

Here, we will return to the central control unit 362 and continue the explanation.

In the central control unit 362, bus line 3
66 is connected to an input bus selector 578. The input bus selector 578 detects the ADCE signal input to the bus line 366 in synchronization with the timing pulse TB6 and determines that the signal coming on the input bus line 370 is a condition signal A. -D conversion data DD is determined, and a signal instructing processing of the input signal from the input bus line 370 is output.

On the other hand, the input bus line 370 is connected to a condition register 574 and a signal switching circuit 576 of the central control unit 362, and the signal switching circuit 576 is normally connected to the D register 516 for storing AD conversion data. It acts as a circulation circuit.

The condition register 574 inputs the ADOF signal, AELK signal, AECG signal,
Timing the WNUP signal, AO signal, and CU signal
The data is captured and stored in accordance with pulses TB1 to TB6.

Further, the signal switching circuit 576 normally circulates the contents DR of the D register 516, but when a signal instructing data fetching is input from the input bus selector 578, the input bus
A-D conversion data DD on line 370
is captured and stored according to timing pulses TB0 to TB7.

Therefore, the condition register 574 and the D register 516 are constantly iteratively updated via the input bus line 370 to provide new set conditions or operating conditions and A
-D conversion data DD is inputted and stored, and in particular, the acquisition cycle of the AD conversion data is the same as the AD conversion cycle of the AD converter.
Note that the signal switching circuit 576 receives the AELK signal input from the condition register 574, and when this AELK signal is input, even if a signal instructing data acquisition is input from the input bus selector 578, , the data DR in the D register 516 continues to be circulated, and no new AD conversion data is taken in. This camera system performs AE lock through this configuration.

As mentioned above, the central control unit 3 receives the condition signal from the input bus line 370 and the A-D conversion data DD.
A more detailed explanation of the configuration for importing data into 62 will be given below.

Now, the input control unit 360 completes the A-D conversion,
The signal ADCE indicating this is a timing pulse.
When placed on bus line 366 in synchronization with TB6, the input bus line 370 has a timing signal at the next word time after the ADCE signal is output.
A-D conversion data in synchronization with pulses TB0 to TB7
As already mentioned, the DD is output sequentially from the lower digits, but for that reason, the central control unit 36
The second side was also synchronized with timing pulse TB6.
At the next word time after detecting the ADCE signal, the input bus line 370 is loaded into the D register 516 in synchronization with timing pulses TB0 to TB7.
You can accumulate DD. Note that during word times other than the above, the input control unit 360 inputs the input bus
On line 370 are various signals that, based on timing pulses, route the signal on input bus line 370 to condition register 5.
You can import it into 74.

Therefore, the input bus selector 578 takes in the signal on the bus line 366, detects that the ADCE signal is input at the timing of TB6, and selects the A from the input bus line 370 for the next one word time.
It is sufficient to adopt a configuration that instructs the import of -D conversion data.

Now, in FIG. 4, 500 is an arithmetic circuit that performs a required operation between data AR of A register 510 and data specified by data selector 502 according to an operation instruction from instruction ROM 504. It is configured to be executed. In addition,
The arithmetic instructions output from the instruction ROM 504 at this time include a plurality of arithmetic control routines, and one arithmetic control routine is selectively executed depending on each photographing mode.

The arithmetic circuit 500 cooperates with auxiliary registers such as a B register 512 and a C register 514 in addition to the A register 510. Furthermore, 506 is a gate for circulating the data BR of the B register 512 and writing data AR from the A register 510, and 508 is a gate for circulating the data CR of the C register 514 and writing the data AR from the A register 510. This is a gate for writing data AR.

The data selector 502 includes a, b, c,
One of the data input from the nine terminals d, e, f, g, h, i is input to the above instruction.
It is configured so that it is selectively applied to the arithmetic circuit 500 according to instructions from the ROM 504.

The data selector 502 receives film sensitivity data DTSV from terminal a, open aperture value data DTAO from terminal b, bending error data DTAC from terminal c, and shutter speed data from terminal d.
DTTV and aperture value data DTAV are input from the e terminal.

Further, from the terminal f of the data selector 502, an instruction is selected from among some fixed data stored in the fixed data ROM 534.
Data specified by the ROM 504 is loaded.

All bits of the data stored in the fixed data ROM 534 are "0".
CSTC, representing CSTO and other specific data;
CSTD, CSTF where all bits of CSTE data are "1", data representing the minimum shutter speed that can be controlled by the camera TMIN, data representing the maximum shutter speed that can be controlled by the camera body
TMAX, TSYN indicating the shutter speed that can be synchronized with the strobe for flash photography, constant CST1 for calculation, maximum aperture value AMAX of the photographing lens device 2 using CST2, etc., but these data are stored in the instruction ROM 504. is selectively applied to the terminal f of the data selector 502 based on the command.

In addition, the data regarding the maximum aperture value AMAX
A plurality of aperture values are stored in the fixed data ROM 534, and these aperture values are appropriately selected and output based on data AMAX regarding the maximum aperture value taken into the camera body from the lens.

By the way, the fixed data written in the fixed data RDM534 includes constants for various calculations, mechanical constraints due to lenses and camera bodies, etc.
For example, it relates to the upper and lower limits of the shutter speed, and is appropriately set depending on the performance of the lens and camera body, the calculation method, or the data setting and limiting method.

Furthermore, the terminal g of the data selector 502,
The contents of the D register 516, B register 512, and C register 514, DD, BR, and CR, are selectively taken in from h and i, respectively.

Note that the terminals a~ of the data selector 502
The instruction ROM 5 determines which terminal from which to import data to the arithmetic circuit.
The data selected by the data selector 502 are all introduced into the arithmetic circuit 500.

The arithmetic circuit 500 executes the instruction
According to instructions from ROM 504, A register 5
10, the data selected by the data selector 502 is taken in, and the required operation is performed between the data AR of the A register 510 and the data selected by the data selector 502. and stores the result in the A register 510, or when a carry or borrow occurs as a result of the operation, the carry flip-flop 540
or set the contents of the A register 510.
It performs arithmetic control operations such as exchanging AR with the content BR of the B register 512 or the content CR of the C register 514.

Now, the instruction ROM 504 that provides arithmetic control instructions to the arithmetic circuit 500 will be explained.

The instruction ROM 504 provided in the central control unit 362 includes eight arithmetic control routines, and these eight routines are output from the SPDW signal and ASLC signal output from the condition signal storage circuit 548 as well as from the condition register 574. A.O.
The selection depends on the state of the signal and the CU signal. According to the states of the SPDW signal, ASLC signal, AO signal, and CU signal, the instruction ROM 5
The program selector 580 determines the arithmetic control routine of 04.

The instruction ROM 504 is configured to execute routines selected and set by the program selector 580 and output control signals to the system. ,program·
This is a counter 582. The program counter 582 has a latch 584 at its inhibit terminal.
However, this latch 584 prevents the program counter 582 from starting unless the first A/D conversion is completed and some A/D conversion data DD is obtained. The program counter 582 is provided to regulate the counting operation of the program counter 582, and as soon as the first ADCE signal is detected by the input bus selector 578, the regulation is released and the counting operation of the program counter 582 is started.

The program counter 582 is configured to count up by one for each timing pulse TB0, and in this system, the instruction is counted up by one for each timing pulse TB0 to TB7. Shion ROM5
One step of arithmetic control operation according to step 04 is performed.

Thereafter, the program counter 582 repeatedly performs counting operations, and outputs a signal indicating this every time the counting operation progresses to a certain step. This signal is the instruction
This signal indicates that the ROM 504 has finished the arithmetic control of one routine, and this signal is sent to the logic circuit 598.
given to. This signal is given a time element by the logic circuit 598, and one is a CALE signal that is put on the bus line 366 in synchronization with the timing pulse TB5 to indicate that the operation has finished, and the other is a CALE signal that is put on the bus line 366 in synchronization with the timing pulse TB5. It is output from the next timing pulse TB0 after the CALE signal is output, and is output as an RSND signal for carrying transfer data on the output bus line 374.

596 is an output logic circuit for placing time-controlled data and signals on the output bus line 374.

The output code of the instruction ROM 504 has a meaning as shown in the code explanatory diagram of FIG.

Now, the instruction code will be explained.

In other words, OP7 determines whether this instruction is related to calculation or data exchange. When OP7 is "0", it commands calculation, and when it is "1", it commands data exchange. It is a command.

When OP7 is “0”, that is, when a calculation command is issued,
OP6 commands the content of the operation; when OP6 is "0", it commands addition, and when it is "1", it commands subtraction.

In addition, at this time, OP5 instructs processing of the calculation result. When OP5 is "0", the calculation result is not recorded in the A register 510, and when OP5 is "1", the calculation result is stored in the A register 510. A command is given to record in the register 510.

Conversely, when OP7 is "1", that is, a data exchange command is issued, OP6 commands the conditions for data exchange, and when OP6 is "0", it is invalid when the carry flip-flop 540 is in the reset state. , and when OP6 is "1", it is valid when the carry flip-flop 540 is in the reset state.

At this time, OP5 also commands the data exchange conditions; when OP5 is "0", it is invalid when the carry flip-flop 540 is in the reset state, and when OP5 is "1", it is invalid. , is valid when the carry flip-flop 540 is in the set state.

If we consider the above matters individually,
When OP7 is “0”, OP6 is “0”, and OR5 is “0”, the contents AR of A register 510 and the data specified by the operand code are added, and the result is stored in A register. Since no data is written to 510, nothing is done after all. In the following explanation, we will refer to this command.
It is called NOOP.

When OP7 is “0”, OP6 is “0” and OP5 is “1”, the contents AR of A register 510 and the data specified by the operand code are added and the result is stored in A register. 510, which is a so-called addition command. In the following explanation, this command will be referred to as ADD.

When OP7 is “0”, OP6 is “1”, and OP5 is “0”, the data specified by the operand code is subtracted from the contents AR of A register 510, and the result is stored in A register 510. is not written, but this operation is to check whether the carry flip-flop 540 is set or not, rather than the result of the operation.
After all, the contents of the A register 510 are compared with the data specified by the operand code. In the following explanation, this command will be referred to as LT.

When OP7 is “0”, OP6 is “1”, and OP5 is “1”, the data specified by the operand code is subtracted from the contents AR of the A register 510, and the result is stored in the A register. 510, which is a so-called subtraction command. In the following explanation, this command will be referred to as SUB.

When OP7 is "1", OP6 is "0", and OP5 is "0", the carry flip-flop 540 resets the data specified by the contents AR of the A register 510 and the operand code. Whether it is set or set, the command is invalid, and ultimately the command is to do nothing. In the following explanation, we will refer to this command.
It is called NOOP2.

When OP7 is "1", OP6 is "0", and OP5 is "1", the carry flip-flop 540 resets the data specified by the contents AR of the A register 510 and the operand code. This instructs that it is invalid when it is set, but is valid when it is set.In the end, it commands that data be exchanged only when the carry flip-flop 540 is set. It is something that In the following explanation, this command will be referred to as SWC.

When OP7 is "1", OP6 is "1", and OP5 is "0", the data specified by the contents AR of the A register 510 and the operand code are exchanged, and the carry flip-flop 540 is reset. When the carry flip-flop 540 is reset, it is valid, but when it is set, it is invalid.In the end, data exchange is performed only when the carry flip-flop 540 is reset. It is something that is being commanded.

In the following explanation, this command will be referred to as SWN.

When OP7 is "1", OP6 is "1", and OP5 is "1", the carry flip-flop 540 resets the content AR of the A register 510 and the data exchange commanded by the operand code. This command is valid whether the carry flip-flop 540 is set or not, and ultimately commands data exchange to be performed regardless of the state of the carry flip-flop 540. In the following explanation, this command will be referred to as SWU.

In the case of the data exchange described above, if the operand of the partner with which data is exchanged with the A register 510 is the B register 512 or the C register 514, the contents AR of the A register 510 can be written to the operand. If is fixed data or setting data, the contents of A register 510
It is not possible to write AR to an operand. Therefore, in this case, the operand data is unilaterally written to the A register 510 rather than data exchange, which is a so-called data read operation, but in the present embodiment system, there is no particular distinction between data exchange commands and data read commands. This data exchange instruction acts as a data exchange instruction only when the operand is a register, and acts as a data read instruction when the operand is other than a register.

As mentioned above, this instruction ROM
504 has the eight instruction systems described above.

Next, the operand code will be explained.

OP4 distinguishes whether the operand is fixed data or variable data. When OP4 is "0", the operand is fixed data and is specified by OP3 to OP0 from the fixed data ROM 534. This specifies the fixed data to be used. Further, when OP4 is "0", the operand is variable data and specifies the variable data input from each input terminal a to i of the data selector 502.

When OP4 is “0”, that is, regarding fixed data, the data specified by OP3 to OP0 is
When OP3, OP2, OP1, OP0 are “0000”, all bits are “0” and CST0 data is “0010”, “11100000”
CSTC data of “0100”, “11010000”
When CSTD data is “0110”, “00011111”
When CSTE data is “0111”, all bits are “1”
CSTF data and also OP3, OP2, OP1,
When OP0 is "1000", the lowest shutter speed that can be controlled by the camera body is TMIN; when OP0 is "1001", it is the highest shutter speed that can not be controlled by the camera body.
TMA, maximum aperture value AMA that can be controlled by the lens when "1010", strobe synchronized shutter speed TSYN controlled by the camera body when "1011", first constant CST1 for calculation when "1100", "1101" ” is each data of the second constant CST2 for the calculation.

When OP4 is “1”, that is, regarding variable data, the data specified by OP3 to OP0 is
When OP3, OP2, OP1, and OP0 are “1000”, the contents DR of the D register 516, that is, DTDR, which is AD conversion data DD, are “1001”, DTSV, and when “1010”, the contents are DR.
DTTV, “1011” DTAV, “1100”
DTAO, DTAC when it is "1101", DTBR which is the content BR of the B register when it is "1110", and DTCR which is the content CR of the C register when it is "1111".

A comparison diagram of the address of the instruction ROM 504, instructions, and operand codes is shown in FIG.
As shown in FIG. In order to make it easier to understand the present invention, this comparison diagram does not show the entire routine of the camera, but the routine that is particularly related to the present invention. This routine is used when the aperture value is set and the shutter speed on the camera is semi-automatically controlled at the same time (see Figure 6), and is used when the shutter speed is prioritized and the aperture is not stopped down when not in flash photography mode. Only the routine (see FIG. 8; this routine corresponds to the third routine shown in FIG. 7) is shown.

FIG. 4 will be explained again.

Overflows that occur as a result of A-D conversion, overflows that occur as a result of adding various data to photometric data, and when the aperture value or shutter speed obtained as a result of calculation exceed the control limit value. Logic circuit 586 generates a signal for blinking the aperture value display or shutter speed display on display 402.

A logic circuit 586 receives the output of the carry flip-flop 540 and the output of the program selector 580, and selects the output of the carry flip-flop 540 at a particular address specified by the program selector 580. A signal is issued to cause the shutter speed or aperture value displayed on the digital display 402 to blink.

The flashing shutter speed signal TVFL output from the logic circuit 586 is temporarily stored in the flip-flop 588 and then sent to the multiplexer 594.
The aperture blinking signal AVF is once stored in a flip-flop 590 and then applied to a multiplexer 594.

Note that this logic circuit 586 includes a logic circuit 59
8, and depending on the RSND signal, the flip-flops 588, 590
will be reset.

The logic circuit 592 also receives inputs of the MNAL signal, signal, BLB signal, SPDW signal, signal, and ASLC signal from the condition signal storage circuit 548, and simultaneously receives the signal, WNUP signal, and CU signal from the condition register 574. Receiving input. This logic circuit 592 discriminates the various signals according to a certain logic, and outputs the signals to the output control section 3.
A display control signal for the digital display 402 and a control signal for the output control section 364 for the digital display 402 are generated.

From this ethical circuit 592, a WNUP signal indicating that the film winding is completed, a warning signal "EEEEEE", an operation error display command signal EDSP,
Bulb display “buLb” display command signal BDSP, when in strobe shooting mode, “EF” display command signal EFDS indicates that strobe charging is complete, indicates that the lens aperture needs to be set manually A display command signal MDSP of "M" is output.

Next, the output control section 364 will be explained.

The output control section 364 has two main functions. One has a display control function and the other has an exposure control function.

This output control section 364 includes a central control section 362.
Various condition signals and various data are input from the output bus line 374. Since these signals and data are input under temporal control, in order to know what kind of signal or data is input to the output bus line 374, it is necessary to check the signal or data. Output bus line 374
I need to know the time it will be posted.

A synchronization circuit 660 receiving a signal input from bus line 366 is provided to obtain this time.

Various signals and data on the output bus line 366 are separated based on temporal judgment based on the output from the synchronization circuit 660 and timing pulses TB0 to TB7 as described above, and the output control section These functions will be incorporated into the corresponding functional parts of H.364.

The various signals in the output bus line 374 are:
The timing pulses TB0-TB7 are separated by a conventional demultiplexer 610 and stored in an output control register 622.

On the other hand, the data on the output bus line 374, such as shutter speed TV, aperture value AV, and control aperture number AVs, are handled differently depending on whether they are data for controlling each mechanism of the camera or data for display. .

Now, to explain the acquisition of data for display, there are two types of data in the output bus line 374 that are used for display: shutter speed data TV and aperture value data AV. These signals are
It is rounded off through the display control circuit 652 and converted into a form suitable for display on the digital display 402. Also, in order to prevent the digital display 402 from flickering due to sudden changes in data, the interval between digital captures is adjusted to prevent flickering. Based on the word time during which each data is loaded on the output bus line 374, the displayed aperture value is stored in the aperture value display register 648, and the displayed shutter speed TVDS is stored in the shutter speed display register 648.
50 and are respectively captured and stored.

After being rounded off to the aperture value display register 648 and shutter speed display register 650, 1/
Display aperture value AVDS and display shutter speed TVDS captured at 2Hz intervals as two-step precision data
will be displayed on the digital display 402 through the next display control circuit 624 and display driver 656.

The display control circuit 624 does not simply display the aperture value and shutter speed, but also needs to display symbols and control blinking of the display depending on the operation mode and operating state of the camera device. Here, various signals TVFL, AVFL, EDSP, BDSP, which are taken in from the output bus line 374 and stored in the output control register 622 are stored.
EFDS, MDSP, etc. will be involved.

Next, detailed description will be given of how control data is acquired from the output bus line 374.

The control data carried on the output bus line 374 is the data for shutter speed control.
The shutter speed control data TV is the data AVs for controlling the number of aperture stages. Output bus line 37 with 8-step precision data
4, and the above-mentioned narrowing stage number control data
AVs is placed on the output bus line 374 as 1/8 step precision data synchronized with the timing pulses TB0 to TB7 at one word time of the third word after the CALE signal is placed on the bus line 366.

Since this shutter speed control data TV corresponds to an apex value, that is, a logarithmically compressed value of the reciprocal of the actual shutter time, it is necessary to obtain data corresponding to the actual shutter time from the shutter speed data TV corresponding to the apex value. requires some kind of arithmetic operation. That is, in order to make this shutter speed data TV a signal of a magnitude corresponding to the actual shutter speed, it is necessary to subtract the shutter speed control data TV from the reference shutter speed apex value. The data obtained as a result of this subtraction corresponds to the number of stages equivalent to the apex value in seconds of the control shutter, and the data obtained in this way is expanded exponentially based on the reference shutter speed. It's something that can buy you time. As mentioned above, in order to obtain the actual time from the shutter speed equivalent to the apex, it is necessary to subtract the shutter speed data TV from the reference shutter speed. This is the circuit 612.

The control shutter seconds data TVs obtained through the subtraction circuit 612 as described above is input to the shutter seconds control registers 614 and 626. The shutter speed control data TV is outputted to bus line 374 based on a control signal specifying the speed data capture time.
It is separated from the body, taken in and accumulated. Incidentally, the shutter time control register 614 is provided to store the integer part of the shutter time data TVs, and the shutter control register 626 is provided to store the decimal part of the shutter time data TVs.

Bus line 3 outputs the narrowing down stage number control data AVs to the narrowing down stage number control register 628 based on a control signal that specifies the time to take in the narrowing down stage number control data AVs from the synchronization circuit 660.
74 and is captured and stored.

As described above, the shutter time control data TV accumulated in the shutter time control registers 614+626 and the number of narrowing stage control registers 628
The exposure control operation in the mechanism section 358 of this camera system will be performed based on the aperture step number control data AVs accumulated in , and now this camera mechanism section 358 and its operation sequence will be explained.

The operation of this camera system is controlled through three electromagnetic mechanical exchange means, shutter release means 396, aperture control means 398, and shutter speed control means 400, which are provided in the mechanism section 358.Now, the operation of each control means will be explained. explain.

Most of the mechanical mechanisms of this camera system are no different from traditional camera mechanisms. The shutter release means 396 is an electromagnetic solenoid that is interlocked with a trigger mechanism that runs a mechanical sequence of the camera mechanism when energized for a certain period of time. Starting the movement of the AE lever 94 (see Figure 3) to preset the aperture value from the camera body side, driving the aperture of the lens,
Mechanical sequence mechanisms operate, such as flipping up the mirror and starting the front curtain of the focal plane shutter.

Further, the aperture control means 398 is an electromagnetic solenoid that urges the clamping mechanism of the AE lever 94 toward the clamp release side when energized.
The AE lever 94 is movable in the unclamped state, and is clamped when the energization is stopped. In such a configuration, before the mechanical sequence of the camera mechanism starts running, the aperture control means 39
8 is energized to hold the clamping mechanism of the AE lever 94 on the clamp release side, and the AE lever 94 is made ready to run when the camera mechanism starts mechanical sequence running. put. Then, according to the mechanical sequence
When the AE lever 94 starts traveling, the amount of travel is detected, and when the amount of travel reaches a predetermined value, the energization to the aperture control means 398 is stopped, thereby clamping the AE lever 94. Return to the clamp position and clamp the AE lever 94. As described above, it is possible to preset the aperture value of the lens, and this has been described previously.

The shutter speed control means 400 is an electromagnetic solenoid that, when energized, controls the start of running of the rear curtain of the focal plane shutter. The curtain is in a running restricted state, and the running restriction of the shutter trailing curtain is canceled due to the energization being stopped, and the shutter trailing curtain starts running. In this configuration, the shutter speed control means 400 is energized to regulate the movement of the rear shutter curtain at the same time as the mechanical sequence of the camera mechanism starts running, and after the front curtain of the shutter starts running, timing is started. When the measured time reaches a predetermined value, the shutter speed control means 400
The exposure time can be controlled by stopping the power supply to the shutter to release the travel restriction of the shutter trailing curtain, and by starting the shutter trailing curtain to travel.

Note that when the shutter trailing curtain finishes running, the mechanical sequence mechanism performs a return operation of the mirror, the aperture drive lever (not shown), and the like.

Note that the shutter release means 396, the aperture control means 398, and the shutter speed control means 400
It is necessary to accurately control its operation timing and operation time, and for this purpose, signals for accurate sequence control obtained according to various conditions are required. A control signal generation circuit 646 is provided in the section 364. This control signal generating circuit 646 supplies the shutter release means 396 and the aperture control means 39.
8. A drive control signal is applied to the shutter speed control means 400 for an appropriate time at a timing such that an appropriate exposure control operation is performed, but these control timings or times are dependent on the operating time of the self-timer, The number of aperture stages accumulated in the aperture stage number control register 628 is controlled by the AE lever 94.
At the timing when the shutter starts running, after the shutter leading curtain starts running, the shutter second control registers 614, 62
It is created based on the timing at which the real time corresponding to the shutter second time data stored in 6 is elapsed, the time to compensate for the mechanical delay of the mechanical sequence mechanism, etc.

The output data of the shutter time control register 626 and the output data of the narrowing stage number control register 628 are input to a data selector 632, and are selectively applied to the down counter 642 based on a command from the control signal generation circuit 646. Ruru.

On the other hand, the output data of the shutter time control register 614 is input to the select gate 618 together with the output data of a constant generation circuit 616 provided to generate constant data corresponding to time for various temporal controls. and the control signal generation circuit 6
frequency dividing circuit 62 selectively based on commands from 46
given to 0.

Note that the down counter 642 has its clock terminal inputted with the pulse signal FPC inputted as the AE lever 94 runs and the output pulse signal of the frequency dividing circuit 620 via the select gate 640. , a configuration in which the data input from the data selector 632 is subtracted and counted based on the pulse inputted through the select gate 640, and a carry generated as a result of the subtraction count is given to the control signal generation circuit 646. It is becoming.

In this configuration, when controlling the number of narrowing stages, the narrowing stage number control data AVs is applied from the narrowing down stage number control register 628 to the down counter 642 through the data selector 632. On the other hand, the clock terminal of the down counter 642 has the select signal.
A pulse signal FPC is inputted via the gate 640 in accordance with the amount of travel of the AE lever 94. At this time, when the AE lever 94 moves, the down counter 642 receives the aperture stage number control data according to the pulse signal FPC.
AVs are subtracted. When the carry is output from the down counter 642 through such operation,
This carry indicates that the number of input pulses of the pulse signal FPC matches the aperture stage control data AVs, and the traveling position of the AE lever 94 at that time has reached the preset position corresponding to the number of aperture control stages of the lens. It shows things. Therefore, the control signal generating means 646 inputted with the carry signal outputs the signal through the aperture control means 398.
By clamping the AE lever 94, the number of aperture steps of the lens is adjusted to the aperture step number control data.
It can be preset to the same value as AVs.

In addition, when performing shutter time control now, the down counter 64 is input from the shutter time control register 626 through the data selector 632.
2, the fractional data of the shutter time control data TV is given. Note that the down counter 642 adds "1" to the decimal data and then takes in this data as data multiplied by eight. On the other hand, the output pulse of the frequency divider circuit 620 is inputted to the clock terminal of the down counter 642 via the select gate 640. At this time, the frequency divider circuit 620 takes in the integer part of the shutter time control data TV from the shutter time control register 614 through the select gate 618, and then converts it into a pulse signal of 1/8 of the reference time. The data which is frequency-divided and outputted as a pulse is taken into the down counter 642 and is subtracted based on the output pulse of the frequency divider circuit 620. When a carry is output from the down counter 642 through such an operation, this carry indicates that the output pulse number of the frequency divider circuit 620 matches the data regarding the shutter seconds control data which is less than a decimal number; This indicates that the real time corresponding to the shutter time control data has elapsed. Therefore, the control signal generating means 646 to which the carry signal is input starts the shutter trailing curtain to run through the shutter speed controlling means 400, thereby changing the shutter time to the actual value corresponding to the shutter time control data TVs. It is something that can be controlled in time.

In addition, to explain the shutter time control in more detail, the shutter time control data mentioned above is
TVs is given as 1/8 step precision data, and this data is now set as TVs=P+α/8 (1). However, P and α are integer values. This data corresponds to the actual exposure time TR=Y×2(P+α/8) (2) with respect to the reference time Y. However, in a digital circuit, calculating 2(P+α/8) requires an extremely complicated circuit, so in this example, 2P+α/8≒2P(1+α/8) (3) is used as an approximation. . Therefore, the actual exposure time TR is expressed as TR=Y×2P×(1+α/8) (4). Note that this formula can be replaced with TR=Y/8×2P×(8+α) (5), so the frequency divider circuit 620 divides the pulse signal Y/8 of 1/8 of the reference time Y into P stages. The frequency is divided to create a frequency-divided pulse of Y/8×2P, and with this frequency-divided pulse, the 8
By subtracting and counting the data +α, the real time TR in shutter seconds can be obtained.

Furthermore, from the constant generation circuit 616, data for specifying the self-second time, data for compensating for delays in mechanical sequence operation, and determining the operation time of the shutter release means 396, and data for determining the operation time of the shutter release means 396, Data for generating on/off signals is output, and both are frequency-divided by the frequency divider circuit 620 and converted into real time, and then given to the control signal generation circuit 646, This is the basis of output control signals for the shutter release means 396, the aperture control means 398, and the shutter speed control means 400.

Next, the operation of the camera according to the above configuration will be explained, but in order to facilitate understanding of the present invention, among the modes of the camera, the above-mentioned semi-automatic, automatic light control, automatic mode and Only the shutter speed-priority automatic exposure (AE) shooting mode will be explained, and explanations regarding other modes will be omitted.

First, the former semi-automatic/automatic light control/automatic mode (also referred to as semi-automatic strobe photography mode) will be explained.

The aperture setting dial 108 (Figs. 1, 2) and the film sensitivity setting dial 106 (Figs. 1, 2) in the strobe device 384 (Fig. 3) are used to set the desired aperture value and the film according to the film used. When the sensitivity is set, the data signal contact 142
(Figures 1 to 3) and data terminal 5 on the camera side
6 (FIGS. 2 and 3), analog signal data VSA corresponding to the aperture value is applied to a signal switching circuit 380 (FIGS. 3 and 4) on the camera side. In this state, if charging for strobe light emission is not completed in the strobe device 384, the signal CSA indicating the completion of charging is not input, and therefore, the input of the data VSA is regulated by the signal switching circuit 380. . Thereafter, when the strobe device 384 is ready to emit light, the control terminal 54 (FIGS. 2 and 3) is connected to the control contact 14 on the strobe device 384 side.
0, current can flow into the charging completion detection current detector 386. At this time, the strobe device 384
Since the changeover switch 146 is set to the semi-automatic mode, the control terminal 54 is connected to the control contact 1.
The second amount of current (CSA2 signal) flows into 40,
The current detector 386 provides a control signal to the signal switching circuit 380, and the TTL photometry means 378 (third,
The data VSA corresponding to the aperture value input from the terminal 56 in place of the analog signal from FIG.
is applied to an A-D converter 382 (FIG. 3). Of course, at this point, it is assumed that preparatory operations such as turning on the power are being performed on the electric circuits of the camera and the flash device. Further, the current detector 386 generates a charge completion signal CGUP, and the signal CU of the encoder 570 (FIG. 4) becomes "1" and the signal AO becomes "0". When such signals CU and AO are applied to terminals a and b of multiplexer 572, these signals CU and AO are applied to bus line 3 in synchronization with timing pulses TB1 to TB6 from signal switching circuit 568.
70 and the condition register 574 and program selector 580 of the central control unit 362 described above.
The ROM 504 completes preparations for executing semi-automatic strobe photography mode arithmetic control according to the signals CU and AO by the output of the program selector 580.

On the other hand, the aperture value data VSA given to the A-D converter 382 is converted into digital data, but the A-D conversion is completed in the input control section 360, and the A-D conversion is completed.
When the signal ADCE indicating the end of -D conversion is placed on the bus line 366 in synchronization with the timing pulse TB6, the input bus line 370 receives the timing signal at the next word time after the ADCE signal is output.
A-D conversion data in synchronization with pulses TB0 to TB7
DD is output sequentially starting from the lower digit. Therefore, the data DD on the input bus line 370 is transferred to the D register 51 in synchronization with the timing pulses TB0 to TB7 at the next word time after the central control unit 362 detects the ADCE signal synchronized with the timing pulse TB6.
Incorporate into 6. Therefore, the data VSA corresponding to the aforementioned aperture value is stored as digital data in the D register 516 (FIG. 4).

Furthermore, the regulation of the latch 584 is released by the aforementioned ADCE signal, the program counter 582 starts counting operation in synchronization with the timing pulse TB0, and the ROM 504 is used to execute the calculation control of the semi-automatic strobe mode as described below. commands are issued sequentially. This allows strobe synchronization shutter speed
A comparison is made between TSYN and the shutter speed DTTV set on the dial 34 (FIG. 3).

This point will be explained with particular reference to FIG.

First, the output of the program selector 580 selects the strobe photography mode of semi-automatic, automatic light control, and automatic mode as described above, and the address 128 of the instruction ROM 504 is selected.
is specified, the above-mentioned strobe synchronized shutter speed stored in the fixed data ROM 534
TSYN is written to A register 510 via data selector 502. Then the program
When address 129 of instruction ROM 504 is specified by the increment signal from counter 582 and instruction LT is output from ROM 504,
The shutter speed TV set with the dial 34 is given to the arithmetic circuit 500 via the signal separation circuit 532, the doubling circuit 530, and the data selector 502,
A comparison calculation is performed between the strobe synchronized shutter speed TSYN and the shutter speed data DTTV corresponding to the shutter speed TV set on the dial 34.

In this shooting mode, there is a subject near a window or the like, creating a so-called backlight condition, so the shutter speed set on the dial 34 is set to a longer time than the strobe synchronized shutter speed.
Therefore, the compare operation at address 129 sets carry flop 540.

Instruction ROM50 in this condition
At address 130 of 4, the instruction SWC is stored in the ROM.
504, the shutter speed DTTV is written into the A register 510 instead of the strobe synchronization shutter speed TSYN. Such data
DTTV is transferred to B register 512 at address 133 of instruction ROM 504 by instruction SWU. Next the instructions
Address 134 of ROM 504 is specified and the instruction
When SWU is output, it is converted into digital data in the process described above, and data VSA corresponding to the aperture value from the strobe device 384 written in the D register 516 is written in the A register 510. Next, at address 140 of the ROM 504, the data CST2 corresponding to the constant 2 output from the fixed data ROM 534 is subtracted, that is, VSA−CST2
= AV is executed and the data AV is stored in the A register 51
Written to 0. Note that since no carry has occurred at address 138 in address 139 of the ROM 504, the instruction SWC has no meaning, and as a result, no processing is executed at address 139.

The aperture value AV obtained in this way corresponds to the aperture setting dial 108 on the strobe device 384 side, but sometimes this calculation result exceeds the limit of the aperture value that can be controlled by the lens. In such cases, it is necessary to notify the photographer of the situation to prevent erroneous operation. For that reason,
In this camera system, the aperture value AV set on the strobe device 384 side is less than or equal to the maximum aperture value AMAX that can be controlled by the lens, and the minimum aperture value
Compare and calculate whether it is greater than or equal to AVo. If, as a result of such comparison calculation, the aperture value AV exceeds the limit of the maximum aperture value AMAX or the minimum aperture value AVo, the limit value AMAX or AVo is replaced with the aperture value AV set on the strobe device 384 side. This is used as the aperture value AV for control.

The address where the above process is executed is the ROM 504.
from address 141 to address 144. That is, the comparison between the data DTAO corresponding to the minimum aperture value AVo given via the data selector 502 at address 141 and the aperture value data AV written to the A register in the above process is executed by the instruction LT. , if carry appears as a result of address 141 at address 142, data corresponding to the minimum aperture value AVo
Write DTAO to A register 510, and if it does not appear, write the aperture value data AV to A register 5.
Leave it at 10. Next, similar operations are executed at addresses 143 and 144, and a comparison calculation is made to determine whether or not the aperture value data AV is between the maximum aperture value AMAX and the minimum aperture value AVo. In this case, aperture value data AV exists between AMAX and AVo,
As a result, it is assumed that aperture value data AV corresponding to the aperture value from the strobe device remains in the A register 510.

Such data AV is stored at address 14 of the ROM 504.
6, the command SUB subtracts the data DTAO corresponding to the minimum aperture value AVo by AV−AVo=AVs
is executed, and the result, the number of aperture stages AVs for aperture value control, is calculated and left in the A register 510. Next data of A register 510
AVs is transferred to C register 514 by designating address 147 of ROM 504.
Therefore, at this point, data corresponding to the stop-down stage number AVs is stored in the C register 514, and the shutter speed DTTV set by the dial 34 is stored in the B register 512.

Next, the shutter speed priority AE shooting mode will be explained.

The mode selector 38 is set to the shutter speed priority side, and the aperture setting ring 8 is set to mark 1 (not shown).
2 is set to the position where the aperture lever 6 is selected.
4A is set to the open side, the shutter speed priority AE shooting mode is selected, the program selector 580 outputs a signal representing the shooting mode, and the instruction ROM 50
When address 0 in No. 4 is specified, the shutter speed TV set by dial 34 is applied to A register 510 via signal discriminator circuit 532, doubling circuit 530, and data selector 502 as described above. The shutter speed data DTTV supplied to the A register 510 is stored in the instruction ROM 5.
B by instruction SWU at address 5 of 04
It is transferred to register 512 and stored. next
D register 5 at address 6 of ROM 504
The photometric data BVo stored in ROM 504 is supplied to A register 510 and stored at address 7 of ROM 504.
It is added to the film sensitivity data SV at , and further, by the commands at addresses 8 and 9 of the ROM 504,
The exposure amount EV is calculated as BVo+Sv=EV-AVo-AVC. By this operation, A register 5
ROM 504 determines whether or not 10 has overflowed.
If an overflow occurs, the maximum capacity of this A register 510 is used as the result of the operation.

Next, the shutter speed data DTTV stored in the B register 512 is subtracted from the exposure amount EV obtained as described above, that is, the aperture value becomes EV-TV=AV.
The operation to obtain AV is executed by instruction SUB at address 12 of ROM 504.

The aperture value AV obtained in this way is
This is control data to satisfy the exposure amount EV calculated for the set shutter speed TV.
In some cases, the result of this calculation may exceed the limit of the aperture value that can be controlled by the lens.
In such a case, it is necessary to notify the photographer of this fact to prevent erroneous operation. For that reason, this camera
As a result of the above-mentioned calculation, the system determines that the obtained aperture value AV is less than or equal to the maximum aperture value AMAX that can be controlled by the photographic lens (not shown), and that the minimum aperture value
Comparative calculations are performed to determine whether the value is greater than or equal to AVo, as in the case of the above-mentioned mode. If, as a result of such comparison calculation, the aperture value AV obtained as a result of the calculation exceeds the limit of the maximum aperture value AMAX or the minimum aperture value AVo, the limit value AVMAX or AVo is changed to the aperture value obtained as the result of the calculation. Instead of AV, use aperture value AV for control. The steps for these comparisons are ROM5
04 addresses 13-16.

Next, from the aperture value data AV for control, the maximum aperture value data AVo of the photographing lens is subtracted AV−AVo.
=AVs is performed at address 18 of the ROM 504, the number of aperture stages AVs for aperture control is calculated, and by designating address 19 of the ROM 504, it is transferred to the C register 514 and stored in the same manner as in the above-mentioned mode. The reason why this camera system performs aperture step number AVs control for aperture control is because the control mechanism of the photographic lens employs a step number control mechanism.

At this point, C
The data corresponding to the number of narrowing stages AVs is stored in the register 514, and the data corresponding to the number of narrowing stages AVs is stored in the B register 512.
The shutter speed DTTV set in step 4 will be stored.

In both of these shooting modes, the B register 512
The shutter speed data DTTV accumulated in the C register 514 and the data corresponding to the number of aperture stages AVs accumulated in the C register 514 are transmitted to the aperture stage number control register 628 and the aperture stage number control register 628 via the output bus line 374 in the subsequent sequence, respectively, as described above. The information is written to the shutter speed control registers 614 and 626 and processed according to the sequence described in detail above, the aperture of the photographing lens is adjusted to the AVs, and the shutter opening time is adjusted to the shutter speed data DTTV. be done.

Note that the other operations of the camera system are performed as already explained.

With the above structure, according to the present invention, not only can slit-like exposure due to forgetting to set the strobe synchronized shutter speed be prevented, but also a subject in a backlit state can be properly exposed.

In the above embodiment, the control terminal 54, current detector 386, and multiplexer 572 mainly correspond to the first generating means, the dial 34 corresponds to the shutter speed setting means, and the fixed data ROM 534 corresponds to the second generating means.
Corresponds to the generating means, and mainly includes the inverter 299,
The doubling circuit 530 and the signal discriminating circuit 532 correspond to the third generation means, and mainly the A register 510, the arithmetic circuit 500, and the carry flip-flop 54.
0 corresponds to the comparison means, mainly the logic circuit 59
6. Output bus line 374 corresponds to gate means, mainly shutter time control register 614,
626 corresponds to the shutter second time storage register;
The shutter speed control means 400, the frequency dividing circuit 620, and the down counter 642 are mainly used as the shutter speed control means.

[Brief explanation of the drawing]

Figure 1-A is a diagram illustrating the configuration of the present invention.
-B is a flowchart according to the first illustrated invention, and FIG. 1 is a configuration diagram of an embodiment of a strobe applied to a camera system to which the present invention is applied, in which a is a front view and b is a rear view. , c is a bottom view, FIG. 2 is a schematic circuit diagram of the strobe shown in the first diagram, FIG. 3 is a schematic configuration diagram of the camera system, and FIG. 4 is a specific circuit diagram of the main control section in the camera system shown in the third diagram. 5 is an explanatory diagram of the output code of the ROM 504 shown in the 4th drawing, and FIGS. 6 and 8 are ROM 504 shown in the 4th drawing.
FIG. 7 is an explanatory diagram showing the relationship between each photographing mode by TTL photometry and external photometry and the corresponding calculation routine. In the figure, 34... dial, 38... mode selector, 54... control terminal, 64A... aperture lever, 386... current detector, 572...
...Multiplexer, 534...Fixed data
ROM, 299...Inverter, 510...A register, 500...Arithmetic circuit, 540...Carry flip-flop, 374...Output bus
Lines, 614, 626...Registers, 620...
...Frequency divider circuit, 642 ... Down counter, 54
8... Condition signal storage circuit, 400... Shutter speed control means.

Claims (1)

[Claims] 1. A first generating means for generating a semi-automatic strobe photography mode signal in response to an electric signal representing a semi-automatic mode supplied from the strobe, a shutter speed setting means, and a second generating means for generating a signal corresponding to the strobe synchronized shutter speed. a third generating means for generating a manual shutter speed signal according to the shutter speed set by the shutter speed setting means; and a strobe from the second generating means in response to the semi-automatic strobe photography mode signal. The synchronized shutter speed signal is compared with the shutter speed signal from the third generating means, and when the manual shutter speed signal from the third generating means is lower than the strobe synchronized shutter speed signal, a first signal is generated; a comparison means for generating a second signal when the speed is the same; a shutter second time storage register; transmitting the manual shutter speed signal to the register in response to a first signal from the comparing means; transmitting the strobe synchronized shutter speed signal to the register in response to a second signal from the comparing means; priority
gate means for transmitting the manual shutter speed signal to the register when the semi-automatic flash photography mode signal is not present in the AE photography mode; and a shutter for controlling the shutter opening time in response to the output from the register. A camera for an automatic light control flash, characterized in that it is equipped with a speed control means.