JPH0329930A - Camera system - Google Patents

Abstract

PURPOSE:To keep a diaphragm at a set value, to eliminate a failure that the depth of field is changed every time one photograph is taken and to excellently perform photographing without depending on elements by performing photographing with a bracket at a set stop and a set shutter speed by switching the emitted light quantity of a flashlight every time one photograph is taken. CONSTITUTION:The system is constituted by including an emitted light quantity switching means 5 for switching the emitted flash light quantity of the flashlight 13, a stop and shutter speed decision means 6 and a control means 1 for taking specified number of photographs at a decided stop and decided shutter speed by switching the emitted light quantity of the flashlight every photographing. The emitted light quantity switching means 5 is provided with a dimming means 12 for performing the dimming of the flashlight 13 and the dimmed light quantity is switched based on the output of he control means 1. Since the emitted light quantity of the flashlight is different every photographing in the case of taking the specified number of photographs, the stop need not be changed every photographing and photographing with the bracket is excellently performed with the flash light.

Description

[Detailed Description of the Invention] Kei Harikuri ■ Rough Estimation Spindle The present invention relates to a camera system, and more specifically to bracket photography in which a predetermined number of images are taken by changing the amount of exposure to the film one by one. The present invention relates to a camera system having functions.

Tall April 4th Generally, when taking a photo with a camera, you set the exposure level, but in many cases you can't tell how good the photo will be based on the exposure level you set until you take the photo. Therefore, bracket photography is performed in which multiple photographs of the same subject are taken with different exposure amounts for each photograph. By the way, it is normal to not use a flash when doing bracket photography like this, but if you were to do bracket photography under flash light, with conventional camera systems, the amount of light emitted from the flash is constant and the aperture changes. By changing the value, the amount of contribution (exposure amount) of the flash to the film surface will be changed.

Problems to be Solved by the Invention However, when the aperture value is changed in this way, the exposure of the background that the flash light does not reach changes greatly compared to that of the main subject, and the depth of field also changes, making the depiction effect less than the intended one. The problem arises that it is different from what was originally created. If you want to change the film exposure of the main subject without changing the exposure of the background, just change the shutter speed when you change the aperture. However, in order to change the shutter speed, it is necessary to ensure that it does not become faster than the sync speed or slower than the camera shake limit, which makes control difficult.

The present invention has been made in view of these points, and it is an object of the present invention to provide a camera system that allows bracket photography to be performed satisfactorily under flash light without the above-mentioned problems.

In order to achieve the above-mentioned purpose of achieving
A flash that emits flash light, a light emission amount switching means for switching the amount of flash light emitted by the flash, an aperture and shutter speed determining means, and a light emitting amount of the flash for each shot at the determined aperture and shutter speed. The camera is equipped with a control means for switching to take a predetermined number of images.

In this case, the light emission amount switching means may include a light control means for controlling the light of the flash, and may be configured to switch the light control amount based on the output of the control means.

Kita Issou According to this kind of structure, since the amount of light emitted by the flash differs for each shot when taking a predetermined number of shots, there is no need to change the aperture for each shot, and therefore bracket shooting under flash light is possible. It can be done well.

Embodiment 1 The present invention will be described below with reference to embodiments shown in the drawings. 1st
The figure shows the main structure of this embodiment as a circuit block.
Among them, the microcomputer (l) forms the core of the camera system and is in charge of various controls. This microcomputer (1) controls flash bracket photography, which will be described later, by changing the amount of flash adjustment correction for each release. The microcomputer (1) has a DX
Circuit (2), Display circuit (3), AE circuit (4),
A D/A conversion circuit (5), an AV-TV setting circuit (6), a photometry circuit (7), a film winding circuit (8), etc. are connected, and signals are exchanged with these circuits. The DX circuit (2) detects the ISO sensitivity Sv encoded on the film when the film is mounted on the camera body and sends it to the microcomputer (1). The display circuit (3) receives display data from the microcomputer (1) and performs various displays. Here, the display circuit (3
) is provided with an outer display section with a display surface provided on the outer surface of the camera body and an inner display section provided within the finder window.

Although there is no particular need to limit this, the amount of light control shift in the case of flash bracket photography, which will be described later, is displayed on both the outer display and the inner display, but the number of bracketed shots is displayed only on the outer display. be done. The AE circuit (4) performs exposure based on the exposure value AV and shutter speed TV calculated by the microcomputer (1). The D/A converter circuit (5) changes the dimming control data outputted from the microcomputer (1) from a digital quantity to an analog quantity and supplies it to the dimming circuit (l2). In this case, the dimming control data is the film sensitivity Sv given from the DX circuit (2).
The light adjustment correction amount ΔSv is taken into account. AV-T
(2) A setting circuit (6) sets the exposure value AV and shutter speed TV in the A, S, and M modes among the P, A, S, and M exposure modes. Here, P is program mode, A is aperture priority mode, S is shutter speed priority mode,
M represents manual mode. Photometric circuit (
7) detects the amount of light from the subject. The film winding circuit (8) is configured to wind the film after the release operation is completed one frame at a time.

Various other operation switches are connected to the microcomputer (1), among which the AE switch (
SAE) is used to select one of the above-mentioned P, A, S, and M exposure modes, and each time it is turned on, the exposure mode is changed, for example, from P-)A to S-+M.
Cyclically select in the order of -+P. The photometry start switch (Sl) is a switch that is turned on when a finger touches the shutter button or presses it halfway, and when the photometry start switch (S+) is turned on, distance measurement, photometry, display, etc. are started. (S2) is a release switch that is turned on when the shutter button is pressed in or fully pressed, and the shutter release operation is started by turning on this release switch (S2). (9) is a shift 1/amount setting switch that sets the unit amount by which the dimming correction amount is shifted, and is set to 0.5EV or l. Select one of the OEVs. Reference numeral (10) is a number setting switch for setting the number of films for bracket photography, and one of 3, 5, and 7 films can be selected. (11) is the bracket 1 setting switch, and when it is ON, bracket shooting is performed and
When using FF, normal shooting occurs.

Next, the dimming circuit (12) to which the dimming control data from the microcomputer (1) is applied via the D/A converter circuit (5) controls the dimming of the flash by stopping the flash (13) from emitting light. an operational amplifier (14) to which the output of the D/A conversion circuit (5) is applied to the (+) input terminal; and a (+) human input terminal of the operational amplifier (14). A light-receiving element (D1) consisting of a photodiode is connected as shown between
), a diode (D2) connected as shown between the output terminal and the (-) input terminal of the operational amplifier (14) in order to logarithmically compress the input of the operational amplifier (14), and a diode (D2) that compresses the logarithmically compressed output voltage. A logarithmically expanded 1 helangistor (OI), a capacitor (C1) connected between its collector and the power supply (Vcc) that integrates the logarithmically expanded current, and a switch (S) that controls the integration operation of the capacitor (C,). ), the output of the collector of the transistor (b, ) is received at the (-) input terminal, and the DC power supply (l5) is connected to the (+) input terminal.
Comparator (I6) that receives the reference voltage (V+) from
It is being structured as such. Note that this light control circuit (12) is provided in the camera body.

Furthermore, the light control circuit (12) includes, for example, an X contact (SX) that is turned on when the front curtain of the F-A calplane shutter is fully opened and the shutter is fully open;
) is turned on, the light emission start signal (ST
+) to the flash (13).
1) and the flash (13) through the second terminal (T2)
The signal (ST2) given from the switch (S
Inharter (17) given to the control terminal (T,) of 1)?
, and a third terminal (T3) for transmitting a light emission stop signal (STY) as an output of the comparator (16) to the flash (13) side. On the other hand, the flash (l3) includes a light emitting part (18) including a xenon tube (19), a light emitting stop part (S+■) which is turned on by the light emitting stop signal (ST3), a light emitting start part (SI3), and a delay circuit (22) that receives a light emission start signal and outputs a low level after a certain time delay; an inharter (23) that converts the low level light emission start signal to a high level and supplies it to the light emission start section (S13); , second and third terminals (TI
) (T2) (T3), and the output terminal of the delay circuit (22) is connected to the fifth terminal (T5). )It is connected to the.

Now, when the shutter button is pressed and the shutter is fully opened, the X contact (SX) is turned on and a low level light emission start signal (sT,) is generated. A signal is generated.

Therefore, a high level is applied to the control terminal (T7) of the switch (S1) via the inharter (17), and this switch (S1) is turned off. On the other hand, Flash (13
)? Then, the light emission start signal (STI) is connected to the inverter (23).
is converted to a high level by the light emission starting part (Sl3)
is applied to Therefore, the light emission starting section (Sl3) is turned on, and the light emitting section (18) emits light. Light from the subject accompanying the emission of a flash enters the camera body through the photographic lens, and a portion of the light is reflected by the film (FLM) and hits the light receiving element (D1). The light receiving element (D,) outputs a current corresponding to the light intensity on the film surface. This output current becomes a voltage logarithmically compressed by the operational amplifier (14) and the diode (D2), and is applied to the base of the transistor (0,).The output current generated on the collector side of the transistor (Q,) is C1) is charged.The charging voltage of this capacitor (C,) corresponds to the exposure level.As the capacitor (C1) is charged and its charging voltage reaches the reference voltage level (V,), The output of the comparator (16) becomes high level.This high level is sent to the light emission stop section (S1■) as a light emission stop signal (ST3).
and stops the xenon tube (19) from emitting light. In this way, when the appropriate exposure level is reached, the flash (13) stops emitting light, and the dimming operation of the flash (13) is completed.

In this case, when the light control data output from the microcomputer (1) is only the film sensitivity Sv (that is, the light control correction amount ΔSV, 10), the light emission stop point is at the second
Assuming (P+) in the figure, when the dimming control data output from the microcomputer (1) becomes a small value due to the film sensitivity Sv plus the dimming shift amount ΔSv, the light receiving element (D1) Even if the same amount of light hits the output point of the operational amplifier (14), the potential at the output point of the operational amplifier (14) decreases, and the transistor (
0. ) collector current also decreases and the capacitor (C+
) will have a longer charging time and the comparator (
Since the reversal (low level → high level) of l6) is also delayed, the flash (l3) stops emitting light at point (P2) (second point).
(see figure). This means that the amount of flash light is overexposed compared to the value initially expected to be appropriate. In FIG. 2, the vertical axis indicates the amount of light emitted by the flash, and the horizontal axis indicates time (1).

Conversely, if the microcomputer (1) outputs dimming control data that is the film sensitivity Sv plus +ΔSV, even if the same amount of light hits the photodetector (D1), the base of the transistor (B,) The potential applied to the capacitor (C1) increases, and the collector current increases accordingly, so that the charging time of the capacitor (C1) becomes faster. As a result, the reversal of the comparator (16〉) becomes faster and the flash (13〉)
The light emission stops at point (P3) in FIG.

This means that the amount of flash light is underexposed.

In this embodiment, as will be described later, during flash bracket photography, the light control data output from the microcomputer (1) is changed from 0 to -ΔSV (over).
→+ΔSv (under) −+−ΔSVX2→+ΔSVX
2→...and so on, 1 of the film for bracket shooting.
Starting with the first shot, data is output in which the amount of light adjustment correction that changes with each release is output, and the light control of the flash (13) corresponding to the data value is performed.Here, ΔSv
is the unit shift amount set in advance with the shift amount setting switch (9), and in the case of this embodiment, it is 0.5EV or 1. OE
It is V.

Next, the operation of this embodiment will be explained according to the flowcharts shown in FIGS. 3 to 6. FIG. 3 shows the basic control of the microcomputer (1) in the flash bracket 12. When this routine is executed, the state of the photometry start switch (S+) is first checked in step (2). Here, when this switch (S1) is ON, the process advances to step (2) and the S and ON processes are performed. This S,
The ON process will be described in detail later with reference to FIG. When the photometry start switch (Sl) is OFF, proceed to step ■ and press the setting switch, that is, the shift amount setting switch (9).
Alternatively, it is determined whether any of the sheet number setting switches (10) is turned on. Here, switch (9) (
If at least one of the items 10) is ON, the process proceeds to step (2) and the bracket setting subroutine shown in FIG. 4 is executed. This bracket setting routine is a routine for setting a unit amount regarding the correction power of the light control data outputted from the microcomputer (1), that is, either 0.5 or 1.0, or a routine for setting the unit amount for the correction power of the light control data output from the microcomputer (1), or for setting the unit amount for the correction power of the light control data output from the microcomputer (1), or This is a routine to set the number of sheets.

At step ■, switches (9) and (10) are both OFF.
If F, proceed to step ■ and press the AE mode switch (S
AE) is turned on. Here, when this switch (SAE) is ON, the routine advances to step (2) and the routine shown in FIG. 4 is executed. This routine sets the exposure mode to one of P, A, S, and M, and returns when the setting is completed. If the AE mode switch (SAE) is not ON in step (2), return to step (2) and repeat the subsequent routine. The order of the steps ■■■ does not need to be limited to the above-mentioned order and may be arbitrarily selected.

Next, the bracket setting routine of step (2) will be explained with reference to FIG. In FIG. 4, first in step (B-1) it is determined whether the number of sheets setting switch (10) is ON or not, and when this switch (10) is ON, step (B-1) is performed.
Proceed to step B-2) and set the number N of images to be taken during flash bracket photography to one of 3, 5, and 7. At this time, the number of sheets can be cyclically selected from 3 to 5 to 7 to 3 each time the switch (10) is turned on. After that, step (
Proceed to B-5) and enter the number of shots N. taken with flash bracketing. Initialize the dimming correction amount 13 14 ΔSV+ (N, = 0, ΔSv1
10). And then return. Said step (
If the sheet number setting switch (10) is OFF in step B-1), proceed to step (B-3) and turn on the shift amount setting switch (9).
) is ON or not. Here, this switch (9)
is ON, the unit shift amount ΔS is set in step (B-4).
Set v to either 0.5 or 1.0.

After that, the process proceeds to step (B-5). If the shift amount setting switch (9) is OFF in step (B-3), the process returns. Now, when the number of sheets setting switch (10) is operated, the process proceeds from step (B-2) → (B-5) → Return, and when the shift amount setting switch (9) is operated next (in this case (Normally, the number of sheets setting switch is not operated), Step (B-1) → (B-3) →
The process progresses in the following order: (B-4)→(B-5)→return.

Next, the SION processing routine will be explained with reference to FIG. When entering this routine, first, in step (#1), the brightness BV of the subject is received from the photometry circuit (7) in order to determine exposure. After that, proceed to step 15 (#2) and read the film sensitivity Sv from the DX circuit (2).
manually. Then, from these subject brightness BV and film sensitivity SV, the exposure amount EV is determined as EV = BV + SV
Calculate based on the formula (Step #3).

Next, in step (#4), input the already set aperture AVS and shutter speed TVS from the AV/TV setting circuit (6), and proceed to the next step (#5>.Step (#5)
Then, it is determined whether the selected exposure mode is P mode or not, and if it is P mode, the exposure amount E is determined from the program diagram.
A control aperture value AVC and a control shutter speed TVC according to V are calculated (step 116). Here, since the program diagram is well known, its explanation will be omitted. After that, proceed to step (#13). Said step (1
15), if it is not P mode, it is determined whether it is S mode or not in step (#7), and if it is not S mode, it is further step (#7).
Proceed to step 9) to determine whether or not it is A mode. If it is not A mode, the exposure mode remains M mode, so in step (#11) the above set AVS,
We decided to use TVS as is, and performed step (11)
Proceed to 13).

l6 If the S mode is determined in step (#7), the control aperture value AVC is set to A by EV and TVS in step (#8).
The control shutter speed TVC is determined from VC = EV - TVS, and then the step (#
13) Proceed to step 13). Also, if the judgment in step (#9) is A mode, in step (+110) the control shutter speed TVC is set from the above EV and AVS. TVC = EV - A
Calculated from VS, the control aperture value AVC is AVC = AVS
Then, the process proceeds to step (1113).

In step (#13), it is determined whether the flash bracket photography mode is selected. If the flash bracket shooting mode has been set in advance by the bracket setting switch (1l), the determination in this step (#13) will be YES, so proceed to step (#14) and set the shutter speed TVC to flash. To synchronize, tune to the maximum tuning speed TVX (TVC-TVX). Next, in step (#15) it is determined whether the exposure mode is P, S or A mode, and if it is any of the exposure modes, in step (#16) the mode is further changed to P, S
If it is either P or S, the control aperture value A is determined based on EV and TνX using the stethoscope (#17).
Recalculate VC, while controlling shutter speed TVC
In this case, the maximum tuning speed remains set to TVX. Step (
If it is neither P nor S in #16), it is A mode, so in step (#18) the control aperture value AVC is set to the set aperture value AVS, while the control shutter speed TVC is left as TVC=TVX. Said step (#15
), if No, it is M mode, and in this case the exposure is left to the photographer, so in step (#19) AVC,
Control the TVC as it is. A for each of these exposure modes
After completing the V and TV settings, perform these steps (It
20), the display circuit (3) is used to display the image. In addition, if the flash bracket shooting mode is not selected in step (#13), proceed directly to step (#20).
tl6) (#8) (#10) Displays the aperture and shutter speed of any one of (111) according to the exposure mode. When the display in step 20) is made, the process then proceeds to step (1121) to determine whether or not the release switch (S2) is ON. Release switch (S
If 2) is OF17 18 F, it is determined in step (1122) whether or not the flash bracket shooting mode is set, and if it is not the flash bracket shooting mode, the number of flash bracket shots is N1.
and the flash adjustment amount ΔSVI are both set to the initial state (NI=
O, ΔSV, = o), return.

Both the initial settings here and the initial settings in step (B-5) in FIG. 4 are N+=O, ΔSV. =O, but the meaning is different. That is, step (
The initial setting in step B-5) is performed only when the sheet number setting switch (10) or shift amount setting switch (9) is turned on, whereas step (1123) in FIG.
The initial setting is to turn on those switches (9) and (10).
This is because it is performed in the routine when the photometry start switch (S1) is turned on, regardless of the timing.

This is necessary because it is desirable to reset (initialize) N and ΔSVI if, for example, the bracket setting switch (11) is turned off during bracket photography to cancel bracket photography. be.

If it is determined in step (#21) that the release switch (S2) is 19 ON, the process proceeds to step (#24) and it is determined whether the mode is flash bracket 1-photography mode. Here, if it is not the flash bracket photographing mode, NI+ΔSv is initialized in step (+125) based on the same reason as in step (1123). After the initialization at step (+125) is completed, the process advances to step (1128). Said step (#2
If it is determined that the flash bracket shooting mode is in step 4), the number of shots N,
is O or not, and if it is not N1-0, step (11
28) and proceed to N. If = 0 (initial state), in step (#27) ΔSVI is also adjusted to match the initial state.
Set SV,=O, and proceed to step (1128).

At step (+128), microcomputer (1)
is the flash light control amount (light control data) from the film sensitivity Sv and the light control correction amount ΔSV+ SVF = SV
Calculated based on +ΔSV+. Next, step (1
In step 29), the calculated flash light control amount SVF is outputted and given to the D/A conversion circuit (5). After that, a release operation is performed (step #30). In this step (#31), AVC, TVC
After the exposure is completed, the next step (1
132) drives the film winding circuit (8) to wind the film by one frame.

Next, it is determined whether or not the flash bracket shooting mode is set (step #33), and if it is not the flash bracket shooting mode, the process proceeds to step (1149) and returns, but if it is the bracket shooting mode, the process returns to step (1149).
134), wait for the metering start switch (S+) to turn OFF, and when the 2-meter switch (S+) turns OFF, the number of shots N1 is incremented by 1 in step (1135), and in the next step (#36). , it is determined whether this number of shots N1 is equal to the preset number N, and if it is not equal, the scheduled flash bracket shooting has not finished, so the next flash exposure compensation is performed on the premise that further flash bracket shooting is to be performed. In order to determine the amount ΔSv, the value of N is first determined in step (#37). by the way,
In this embodiment, flash bracket photography sequentially adjusts the flash exposure compensation amount ΔSV for each film. 0 → -ΔSV, (over-) → +ΔSV+ (7 under) → -Δsv,
This is done by changing X2→+Δsv, x2→..., so N. Therefore, it is necessary to make a judgment. Then, if N+ is determined to be an odd number in step (#3B), the process proceeds to step (#39) and calculates ΔSV, ΔSV+ = (
N+1) xsv/2, step (lI41
). If NI is an even number in step (#38), proceed to step (+140) and calculate ΔSV+ = N1XΔSV
/2 to calculate ΔSV+ and proceed to step (il41).

In step (141), the next number of shots and the amount of light adjustment correction are displayed on the display circuit (3). Then, wait for 5 seconds to elapse (step "#42"), and when 5 seconds have elapsed, proceed to step (#49) and return. Therefore, in this case, the above display will be performed for 5 seconds. However, in the middle When some key is turned on, the process returns without waiting for 5 seconds to give priority to the function executed by turning on that key (step ``143, 1+49'').

If it is determined in the above step (#36) that the number of shots N, is equal to the set number N, it means that the scheduled bracket 1 shooting has been completed. Wait until S1) turns OFF. Then, the photometry start switch (S1) is OF.
When it reaches F, in step (1145) N1 and ΔSv1
are initialized, and in the next step (#46), the completion of bracket photography is displayed on the display section of the display circuit (3).

Then, wait for such a display to be displayed for 5 seconds (step 1147), and return (step #44).
.

If any key is turned on before 5 seconds have elapsed, the process immediately returns to give priority to the function executed by turning on that key (+148).

As described above, in this embodiment, the light control circuit (13) that controls the light of the flash (13) in the flash bracket shooting mode
By varying the amount of light control (12) based on the amount of light adjustment correction output from the microcomputer (1), the amount of light emitted by the flash is changed for each image (switching).
The aperture is not variable.

Effects of the Invention According to the present invention, since bracket photography is performed by switching the amount of flash light for each shot under the set aperture and shutter speed, the aperture can remain at the set value, and therefore Problems such as changes in the depth of field can be resolved, and the shutter speed does not need to be changed at the set value, allowing for good bracket shooting that is not affected by factors such as synchronization speed and camera shake limits. be able to.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing the main parts of a camera system embodying the present invention, FIG. 5 and 6 are flowcharts showing the operation. (l) - Microcomputer, (5) - D/A conversion circuit, (]1) - Bracket setting switch, (12) -
Dimmer circuit, (13) - flash (14) - operational amplifier.

Claims (2)

[Claims] (1) A flash that emits flash light, a light emission amount switching means that changes the amount of flash light emitted by the flash, an aperture and shutter speed determining means, and a flash that fires each photo at the determined aperture and shutter speed. A camera system comprising a control means for taking a predetermined number of images by switching the amount of light emitted. (2) The camera system according to claim 1, wherein the light emission amount switching means has a light control means for controlling the light of the flash, and switches the light control amount based on the output of the control means. .