JPS602924A - Automatic exposure control of multiprogram of camera - Google Patents

Abstract

PURPOSE:To perform self-timer photography wherein picture effect is considered by providing a circuit which selects a specific program mode in switching from a normal mode to a self-timer mode. CONSTITUTION:A selection signal generating circuit 11 outputs sequentially signals IN1-IN7 every time a switch SW1 is turned on and off. Various normal modes are selected with the signals IN1-IN5; and a 2sec self-timer mode is selected with the signal IN6, and a 10sec self-timer mode is selected with the signal IN7. Display driving circuits 12-18 for the respective modes are operated corresponding to the signals to display a set program mode. The 2sec self-timer mode is used for copying, etc., and the 10sec self-timer mode is used for general self-timer photography; and the both select small-aperture priority program control.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-program automatic exposure control camera that is set to a predetermined program mode when switching to self mode.

In recent years, with the rapid development of electronic equipment, highly electronic cameras have been developed, and multi-program automatic exposure cameras incorporating a wide variety of program diagrams have been devised.

Multi-program automatic exposure control cameras are programmed to take into account camera shake and image effects, and those that take image effects into account include those that give priority to open apertures, those that give priority to small apertures, and those that give priority to high-speed shutter speeds. There are some that are slow shutter speed priority. In addition, Cell 7 timers are widely used by beginners, and in particular, regular self-timers (excluding the 2-second 7 Lua timer used for copying, etc.) are mostly used for commemorative photos of two to several people, taking into account the background. , and is used with the aperture narrowed down. However, in a conventional multi-program automatic exposure control camera equipped with a seven-lua timer device, when performing self-timer photography, exposure is controlled by the setting program mode before setting the self-timer. It was not desirable except for the aperture priority one.

The present invention was made in view of the above-mentioned circumstances, and is a multi-program automatic exposure control camera that can be switched to various Breegram modes. Another object of the present invention is to provide a multi-program automatic exposure control camera that automatically switches to a program mode suitable for self-timer photography among various program modes.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a multi-mode automatic exposure camera from above. 1 is the camera body, 2 is the lens body that can be attached to the camera body 1, 3 is the release button, and 4 is the electrical transmittance control of the liquid crystal, etc. 5 is an exposure control mode selection button which is a switch for changing the exposure control mode, and 6 is a photometry button used when photometry is desired.

Figure 2 shows the program line of the multi-mode automatic exposure camera shown in Figure 1, and the vertical axis represents the aperture value (FA
) The horizontal axis is the shutter time (T), and the diagonal axis is the EV value (
LM[) in A8A 100 is shown. 0 indicates a standard program mode (hereinafter referred to as normal program mode) using a frequently used combination of shutter speed and aperture value. For EV=0 to 5, shutter speed 'l'==4 to 1/8 aperture value F=2, FiV=5
From ~19, shutter time T = 1/8 aperture value F =
2 and shutter time T = 1/1000 aperture value F22
It is programmed as a straight line connecting the two points of 2. D uses EV=o to 13 as aperture priority mode (hereinafter referred to as "gradient mode") in which the depth of focus is shallow using the widest aperture, and EV=11 to 19 uses a high-speed shutter speed. It is used as a second priority mode (hereinafter referred to as stop motion mode), and in this example, gv=o to 12 is used with aperture value F=2 and shutter second time T.
= 4 to 1/1000, Ev = 13 to 19, shutter time T = 1/1000, aperture value F = 2 to 22
is programmed as. E uses low-speed shutter speeds from HV = 5 to 14 as a shutter speed priority mode (hereinafter referred to as "no-manning shot mode") used for panning shots, etc., and closes down the lens aperture from EV = 12 to 19. In this example, EV = 0 to 6 is used as aperture priority mode (hereinafter referred to as pan focus mode) with a deep depth of focus.
~1/15, BV=6~13, shutter time T=
1715, aperture value F=2-22, EV=13-19
up to, aperture value F = 22, shutter speed T = 1/15
~1/1000 is programmed.

FIG. 3 specifically shows the exposure control mode display section 4 shown in FIG. 1, where 4a is a 10-second self-mode, 4b is a 2-second self-mode, 4C is a normal program mode, and 4d is a normal program mode.
l is glad mode, 4d.

4e1 is a pictograph and symbol representing a stop motion mode, 4e1 is a northern shot mode, and 4e2 is a pan focus mode.

Below, the camera is programmed as shown above with an open aperture of F.
= 2, attaching a lens with minimum aperture F = 22, ASA sensitivity 1
The case where a 00 film is inserted and photographed will be explained. Note that the focal length of the lens is approximately 59 mm. When the main switch (not shown) is turned on, a 4C pictograph appears on the exposure control mode display section 4.

When the exposure control mode selection button 5 is pressed once, 4e appears on the exposure control mode display section 4 and 4C disappears, indicating that the exposure control mode has been switched from the normal program mode to the pan focus mode. Next, when the exposure control mode selection button 5 is pressed again, 4e disappears and a pictograph 4d2 appears, indicating that the pan focus mode has been switched to the stop motion mode.

Similarly, when the exposure control mode selection button 5 is pressed sequentially, the N output control mode is switched sequentially to vanning shot mode, gradient mode, 2 second self mode, 10 second self mode, and normal program mode, and the exposure The pictographs on the control mode display section 4 are also sequentially 4e1*4d.
, *4b+4ae4c is displayed to display the exposure control mode. Further, if the exposure control button is held down, the exposure control mode and the exposure control mode display are switched sequentially corresponding to each other.

Next, when photographing each mode, if the desired exposure cannot be obtained in the setting mode due to subject brightness, each exposure control mode display section 4 blinks to notify the photographer.

In addition, when using 2 seconds self mode or 10 seconds self mode,
Although the display is self-display, the exposure control mode is automatically switched to the normal program mode.

FIG. 4 shows the control circuit of the camera shown in FIG.
SW1 is a switch that is opened and closed by the selection button 5 shown in FIG. 11 is a selection signal generation circuit that sequentially outputs signals IN, INγ every time the switch SW1 is opened and closed;
12 is the signal IN.

The normal program display drive circuit 13 is operated by the signal IN, the pan focus program display drive circuit is operated by the signal IN, the stop motion mode program display drive circuit 14 is operated by the signal INs, and the reference numeral 15 is the signal IN4.
16 is a gradient mode program display drive circuit operated by the signal IN; 16 is a vanning shot mode program display drive circuit operated by the signal IN; 17 is a 2-second self mode display drive circuit operated by the signal IN; 18 is a signal IN; I
10 seconds self-mode display circuit operated by N, 19 is a photometering circuit, and the output of this photometering circuit 19 is an operational amplifier OP↓
Outputs an EV value signal via 0. This EV value signal is applied to the normal program display drive circuit 12. 20
21 is a normal program line selection circuit operated by the signals IN, tIN, , IN, and 22 is a pan focus program line and banning shot program line selection circuit operated by the signal INt or IN.
23 is a stop motion mode line and gradient mode line selection circuit operated by the signal IN3 or IN, and 23 is the signal IN and IN.

24 is an OR gate to which the output of the OR gate 23 and the signal IN1 are applied, and 25 is a limiter circuit to which the outputs of the selection circuits 20, 21, and 22 are applied. The output of this limiter circuit 25 is output from the operational amplifier O
A calculated aperture value AV signal is output via P2.8 and is also applied to the aperture control circuit 26. The AV signal is applied to display drive circuits 13 and 15. 27 is a subtraction circuit in which the output of the photometric circuit 19 is subtracted from the output of the Mitsuter circuit 25. 28 is a limiter to which the output of the subtraction circuit 27 is added.
circuit. The output of this limiter circuit 28 is an operational amplifier Qp.
A calculated second TV signal is outputted via the shutter control circuit 29 and is also applied to the shutter control circuit 29. The TV signal is applied to display drive circuits 14 and 16. 3o is a timer circuit to which signals IN and IN are applied; 31 is a switch SW2 or tie 17 = circuit 3o and signal IN;
A release drive circuit driven by IN, the output of this release drive circuit 31 controls the transistor TRI to drive and control the electromagnet Mgl.

Thus, each time the switch SW1 is closed, the selection signal generating circuit 11 sequentially outputs the signals IN, .about.IN. For example, when the signal IN1 is output, the normal program line selection circuit 2o is activated, the output of the photometry circuit 19 is added to the selection circuit 2°, and the calculation signal of the AV value along the a-gram line of the normal program is Output.

This calculation signal is limited by a limiter circuit 25 so that the aperture value falls within a set range, and this output is applied to an aperture control circuit 26 via a calculation amplifier 0P28.

On the other hand, the subtraction circuit 27 subtracts the aperture value from the limiter circuit 25 from the output from the photometry circuit 19 and outputs the TV value.
This TV value signal is limited by a limiter circuit so that the aperture value falls within a set range, and this output is sent to the shutter control circuit 2 via an arithmetic intensifier IJ 0P29.
Added to 9. - Then, when the switch SW2 is closed by operating the release button 3, the release control circuit 31 is activated, the transistor TRI is turned on, the electromagnet Mgr is excited, and the release operation is started.

5 and 6 specifically show FIG. 4. In the photometric circuit 11 shown in FIG. 5, OLKI is an oscillator that outputs a repeating signal of high level and low level at one fixed period, and 081 is an S input. This is a one-shot multivibrator that outputs one pulse of a high-level signal t- every time a high-level rising signal is applied to the terminal according to the switch SW1. AND 1 is an AND gate, and 0 几1 is an OR gate. FFI to FF7 are D-type 7 ribs and 7 pins, and PUO is a power-up clear circuit, which outputs one pulse when a power-on switch (not shown) is turned from OFF to ON. The output of the power-up clear circuit PUO is the set input terminal S and 7 ribs of the flip-flop FFI.
It is applied to the reset input terminals of FF2 to FF7. In the normal psigram drive display circuit 12, N
F2 is a display circuit for lighting up the display of the pictograph 4c in FIG.

AND2 and AND3 are AND gates, 0几2 is an OR gate, and OMPI and OMP2 are comparators.

A voltage corresponding to the exposure amount EV value is applied to the inverting input terminal of the comparator OMP1 and the non-inverting input terminal of the comparator OMP2. Further, the output voltage from the constant voltage source V19 is applied to the non-inverting input terminal of the comparator OMP1, and the output voltage from the constant voltage source 0 is applied to the inverting input terminal of the comparator OMP2. Constant voltage source V19 is E
Outputs voltage corresponding to V value 19, constant voltage source ■0 is EV
Outputs voltage corresponding to VO2. OLK, 2 is 1 constant 71
This is an oscillator that outputs a repeating signal of high level and low level, and its output is input to one of the input terminals of OAG)0 几2. Pan focus four-gram drive display circuit 1
3, PF2 is a display circuit for lighting up the display of the pictograph 4e in FIG. AND4 and AND5 are AND gates, and 03 is an OR gate.

(JMP3 is a comparator, and this comparator OMP
A voltage corresponding to the aperture AV value is applied to the non-inverting input terminal No. 3. The constant voltage source V16 is a constant voltage source that outputs a voltage corresponding to the AV value of F16, and its output voltage is input to the inverting input terminal of the comparator OMP3. 0LK3 is an oscillator that outputs a high level and a low level in one fixed period, and its output is input to one of the input terminals of OR3. In the stop motion mode busigram drive display circuit 14, 8M2 is the pictograph 4 in FIG.
This is a display circuit for lighting up the display d. AND
6 and AND 7 are AND gates, and OR4 is an OR gate. OMP4 is a comparator, and a voltage corresponding to the TV value of the shutter speed is applied to a non-inverting input terminal of the comparator OMP4. F500 outputs a voltage corresponding to the TV value at a shutter speed of V500 seconds. It is a constant voltage circuit, and its output voltage is determined by comparator OMP4.
is applied to the inverting input terminal of 0LK4 is an oscillator that outputs a low level with one constant cycle, and its output is input to one end of the input terminal of OR4. In the gradient mode program drive display circuit 15, 0
M2 is a display circuit for lighting up the display of the pictograph 4d in FIG. AND8 and AND9 are AND gates, and OR5 is an OR gate. OMP5 is a comparator, and a voltage corresponding to the aperture AV value is applied to the inverting input terminal of the comparator OMP5. ■2.
8 is a constant voltage circuit that outputs a voltage corresponding to the AV value of the aperture F2.8, and its output voltage is input to the non-inverting input terminal of the comparator OMP5. 0LK5 is an oscillator that outputs high and low levels at regular intervals, and its output is input to one of the input terminals of OR5.

Banning shot mode program I [+display circuit 1
6, F82 is a display circuit for lighting up the display of the pictograph 41N in FIG. ANDIO and ANDII are AND gates, and OR6 is an OR gate. OMP6 and OMP7 are comparators.

The inverting input terminal of the comparator OMP6 and the non-inverting input terminal of the comparator OMP7 are connected to the shutter speed T.
A voltage corresponding to the V value is applied. F30 is a constant voltage circuit that outputs a voltage corresponding to the TV value of shutter speed V30, and its output voltage is input to the non-inverting input terminal of comparator OMP6. Further, v8 is a constant voltage circuit that outputs a voltage corresponding to the TV value at shutter speed 1/8, and its output voltage is input to the inverting input terminal of comparator OMP7. 0LK6 is an oscillator that outputs high level and low level at a constant cycle, and its output is OAG)
Input to one of the input terminals of OR6. In the 2-second self-mode drive display circuit 17, S21 is a display circuit for lighting the display of the pictograph 4b in FIG.
12 is an AND gate, and OR7 is an OR gate. 0L
K7 is an oscillator that outputs high and low levels at regular intervals, and its output is input to one of the input terminals of OR7. 10 seconds self mode drive display circuit 18
, 5101 is a display circuit for lighting up the display of the pictograph 4a in FIG. 3, AND13 is an AND gate, and OR8 is an OR gate. 0LK8 is an oscillator that outputs a high level and a low level at regular intervals, and its output is input to one of the input terminals of OR8. 23 is an OR gate to which signals IN, , IN are input, a tie circuit 30 and a release drive circuit 31;
and gate, 0 几9 and ORI O are or gate, N
0RI is a Noah gate, and SW2 is a release switch.

0LK9 is an oscillator with an oscillation frequency I KHz (period I
MSFJO) outputs a square wave. The output of the oscillation ¥1 OLK9 is input to one of the input terminals of the AND14. 0LKIO is an oscillation frequency of 5 KHz (period 0
．． The output of the oscillator 0LKIO is input to one end of the input terminal of the AND15. C0UNT1 is a counter that performs a count-up operation every time a rising signal that changes from low level to high level is input to the OLK input terminal, and when it has counted i o, o o o times, it switches the Q output from low level to high level for a short time. . 0
82 is a one-shot multi-pipe rake that outputs a high-level pulse for a short time from the Q output when a rising signal is applied to the 8-man power. TRI is a transistor, and Mgt is an electromagnetic magnet that locks the camera's release operation.The structure consists of a permanent magnet at the center and a coil wound around the outside.

When the current is not energized, the holding force of the permanent magnet attracts the shutter locking member (not shown), but when the transistor T1 turns on and the coil becomes conductive, a current flows in a direction that cancels out the magnetic flux of the permanent magnet. It flows and releases the suction of the locking member,
A series of release operations starts.

Next, the operation of the circuit described above will be explained. Turn on the power switch (not shown) and turn on the power.
A signal at H level is output for a short time from the power-up clear circuit P U O, setting the flip 70-tube FFI and resetting the 7-rip 70-tube FF2 to FF7. Therefore, an H level is output from the Q output terminal of the 7-lip 4-tube FFI, and the 70-lip FF2 to FF
A low level is output from the Q output terminal of 7. Part 1 below
Press mode selection button 5 in the figure and turn on switch SW 1.
This state is maintained as long as there is no L. When switch SWI is turned on, one-shot multivibrator O81 8
A rising signal is applied to the input terminal. The one-shot multivibrator 081 outputs a high-level signal for a short time, and this output is input to the OLK input terminals of the 7 lip-flops FFI to FF7 via ORI. Therefore, the I (level) signal is input to the D input terminal. The output of the output end Q of the 7-rip 70-tube FF2 to which is applied switches from low level to high level.In addition, the output terminals of the 7-rip 70-tube FFI and FFs 3 to 7 to which a low level is applied to the D input terminal switch from low level to high level. A low level is output from Q.

Furthermore, when the switch 8W1 is turned on from OFF, the input terminal F is applied with the H level to the D input terminal.
The output of the output terminal Q of F3 switches from low level to high level. In addition, 7 circuits FF'1, FF2, and FF4 to which an L level is applied to the D input terminal
The beam level is output from the output tJQ of 7. In other words, the 7 lip-flops that output an H level every time switch SW1 is switched from OFF to ON are FFI → FF'2 →
It will shift to F'F3.

Similarly, from now on, every time switch SW1 is switched from OFF' to ON, the 7-rippu 4 that outputs H level is FF3.
→FF4→Fp5→FF6→FF7→FFI→・・
...and it will change repeatedly.

Also, turn switch 8W1 from OFF to ON, and then turn it ON.
If it is left as is, a high level signal will continue to be applied to one of the input terminals of the AND gate AND 1, so the output signal of the AND gate AND 1 will be Ol, K.
A repeating signal of high level and low level from I is output as is. Ant game) ANDI output is 01 (, 1 through 70 flip FF)
Since the input is to the OLK input terminal of I to FF7, even if the switch SWI is left in the ON state, the oscillator 0
The 7 lip-flops that also output H level at the LKI cycle are FFI → FF2 → FF3 → FF4 → PF5.
→ FF6 → FF7 → FFI will be shifted sequentially.

Now, returning to the story when the power is turned on, when a pulse is output from the power-up clear circuit PUO, the flip-flop F
The output of only the output terminal Q of FI becomes high level, but at this time, the output IN of the flip-flop FF'l is applied to the normal/l/7' program line selection circuit 2o.
is selected, and the AV value and TV value are calculated and output on the program line indicated by the second fJ c. However, at this time, the light is output from the photometry circuit which will be described later in FIG. The voltage corresponding to the EV value (hereinafter referred to as YET, 0) is VE
v(V19, that is, when the subject light quantity is less than EV19, the output of the comparator OMP1 becomes high level. Also, when Vgv>VO, that is, when the subject light quantity becomes greater than EVo, the output of the comparator OMP1 becomes high level. OMP2 output high level.Comparator OM
PIMIF and OMP 2 Riki Ryokawa is an anime game) AND
Since 2 is ANDed, "tf'gv is V19.
> vEv > v.

Only if and gater ′I′L/ < A/O, conversely, VEV is Vgv>V
When vEv becomes 19, the output of comparator OMP 1 becomes low level, and when vEv becomes 0, the output of comparator OMP 2 becomes low level, so vEv
〉V19 or VEV < VO,
Antgame) The output of AND2 becomes low level. As can be seen from the above explanation, the output of the AND gate AND2 will be at a high level when the subject brightness allows appropriate exposure control from EVO to EV19, but at EV1
If it is brighter than 9 (too bright) or darker than EVO (too dark), a low level will be output.

Now, to explain the operation of the circuit when VEV is V19 > Vgv > VO, the output of the AND gate AND2 becomes high level, but the output of the AND gate AND2 becomes OAG) Of(,2's input terminal Since the input is to one of them, the output of OR and 2 also becomes high level. The output of OR2 is input to one end of the input terminal of AND3.
Since a signal of a higher level than the Q output of is applied, the output of the AND gate AND3 becomes a high level.

Therefore, the display circuit NP2 is activated, and the pictograph in FIG. 3:
Graph 4C is displayed by lighting. As a result, the photographer can determine that the currently selected program mode is the normal program.

Next, when VEV deviates from V19 > VHy > vo, the output of AND2 becomes low level, and a low level is applied to one of the input terminals of OAG)0 2. However, since a repeating signal of high level and low level is applied from 0LK2 to the other side of OR2,
The output of the oscillator 0LK2 has the same waveform as the output of the oscillator 0LK2, and is input to the AND gate AND3. For this reason, the output of the oscillator AND3 also has the same waveform as the output of the oscillator 0LK2, and the display circuit NP2 repeats operation and non-operation at the same period as the oscillator 0LK2. As a result, the pictograph 4c in FIG. 3 becomes a blinking display, allowing the photographer to determine that although the currently selected program mode is the normal program mode, proper exposure cannot be obtained due to an inappropriate scene.

Next, when switch SW1 is turned from OFF to ON and the 7 flip-flop that is outputting a high level is shifted from FFI to F B'2, the ■N2 signal, which is the Q output of flip-flop FF2, will be applied. The selection circuit 21 that selects the pan focus program line selected is selected, and the AV value and TV value are calculated and output on the program line indicated by 21dE. At this time, the calculated AV value (hereinafter vA
Let it be v. ) becomes VAV>V16, that is, the performance m
When the A■ value becomes larger than the AV value of F16, the output of the comparator aMpai becomes high level.

Conversely, when the calculated nAv value becomes smaller than F16, the output of the comparator OMP3 becomes low level.

Since the output from the aforementioned Android game AND2 and the output of the comparator OMP3 are input to the input terminal of the Android game) AND, the Ev value from the output of the AND gate AND4 is 0 to 19, and the operation nAV A high level is output only when the value becomes larger than the AV value of F16. Now, if we consider the case where the EV value and the calculated nAV value satisfy the above conditions, since the AND4 outputs a high level, the output of the AND4 is applied, and the output of the AND4 is also applied. Becomes a high level. Therefore, since a high level signal is applied to both input terminals of the ungate AND5, the AND gate AND5 outputs a high level. Therefore, the display circuit PF2 enters the operating state, and the pictograph 41! of FIG. 3!
Turn on the display 2. As a result, the photographer can determine that the currently selected mode is the pan focus program.

Next, when the Ev value and the calculated iAV value deviate from the above conditions, the AND gate AND4 outputs a low level.

Therefore, a low level is applied to one end of the input terminal of the OAG)0几3.

On the other hand, the oscillator 0LK3 is connected to the low input terminal of the OR gate O3.
Since a repeating signal of low level 1 high level which is the output of is applied, the output of OR3 has the same waveform as the output of the oscillator a r,i<,a. or gate O
Since the output of R3 is input to the AND5, the output of the AND5 also has the same waveform as the output of the oscillator 0LK3.

Therefore, the display circuit PF2 repeats activation and deactivation at the same cycle as the oscillator 0LK3, and as a result, the display of the pictograph 4e in FIG. 3 becomes a blinking display.

This allows the photographer to determine that the currently selected mode is pan focus mode, but the brightness of the subject is such that a pan focus effect cannot be obtained, or that proper exposure is impossible. . Now, consider the case where the switch SWI is turned on from OFF and the flip-flop FF3 is outputting a high level. The following circuit operation description is based on the above-mentioned 7 Lipf Prize Tsubu FFI.

It is almost the same as when FF2 is outputting a high level, so a detailed explanation will be omitted, but when the 7-lip-flop FF3 outputs a high level, the selection circuit 22 that selects the stop motion block 4-gram line is selected, and the second circuit is selected. The AV value and TV value are calculated and output on the program line shown by . At this time, the subject brightness is EVO~EV19
And the calculated TV value is shutter speed 1/1000
If it is larger than the TV value in seconds, display circuit SM2
enters the operating state, and the display of the pictograph 4d2 in FIG. 3 lights up.

In addition, when the IjV value and the calculated TV value deviate from the above conditions, the display circuit SM2 repeats operation and non-operation at the same cycle as the oscillator 0LK4, and the display of the pictograph 4dl in Fig. 3 blinks, and the stop motion effect is Inform the photographer of the stand you are unable to obtain.

Furthermore, when the switch SW1 is turned from OFF to ON and the 7 rib block FF4 outputs a high 1/belt tJj, the selection circuit that selects the gradient mode program line is selected, and the AV on the program line shown in the second diagram is selected.
The value and TV value are calculated and output. At this time, the subject brightness is EV
O to EV19, the calculation A V value F = 2.
8 (7) When the performance RA is smaller than the V value, the display circuit GM2 enters the operating state, and the pictograph 4d in FIG.
, the display lights up.

Further, when the EV value and the calculated nAY value deviate from the above conditions, the display circuit GM2 repeats operation and non-operation at the same cycle as the oscillator 0LKs, and the pictograph 4d in FIG.
The display will flash to warn the photographer that the Gradient effect cannot be obtained.

Also, turn switch SW1 from OFF to ON, and press 7.
When the four-tube FF 5 outputs a high level, the selection circuit 21 that selects the panning shot program line 2 is selected, and the AV is selected on the program line shown in FIG. 2E.
The value and TV value are calculated and output. At this time, the subject brightness is EV
O to BV19 and the actual nTv value is shutter speed 1
When the value is larger than the TV value of /8 and smaller than the TV value of 1/30, the display circuit PS2 enters the operating state, and the display of the pictograph 4t1 in FIG. 3 lights up. Also EV
When the value and the calculated AV value deviate from the above conditions, the display circuit PS2 repeats operation and non-operation at the same cycle as the oscillation 8a OLK6, the display of the pictograph 4e in Fig. 3 blinks, and the panning effect cannot be obtained. Give a warning to the photographer. The mode selection and the warning display when the normal display is inappropriate have been described above for each program mode which is the normal mode except the self mode.

Next, the operation when the self-timer mode is selected will be explained.

When selecting the panning shot mode, switch 8 is also pressed.
If W1 changes from OFF' to ONL, 71J knob 7
The Q output of FF6 becomes high level, and the Q output of FF6 becomes high level.
The output signal IN6 is applied to the normal program line selection circuit 20 via OR gates 23 and 24.

Subject brightness is BvO~l! When it is within the range of V19, a high level is output from the above-mentioned AND2 and inputted to one end of the input terminal of ORG0117, so OR7 outputs a high level. Therefore, a high level is applied to both input terminals of the Android game AND12, and the Android game AND12 outputs a high level.
The display circuit 821 becomes operational and displays the pictograph 4b in FIG. 3 by lighting it. Subject brightness is E■0~E
If it is outside the range of V19, a low level is applied to one end of the input terminal of OR7, and the output of OR gate OR7 has the same waveform as the output of oscillator 0LK7, and as a result, the output of AND gate AND12 also has the same waveform as oscillator 0LK7. becomes. Therefore, the display circuit 821 uses the oscillator 0LK7.
It repeats operation and non-operation at the same cycle as , and the display of the pictograph 4b in FIG. 3 blinks, warning the photographer of inappropriate exposure. Then turn switch SW1 OFF
F to ONL, the Q output of the flip 7 quadruple FF7 becomes high level, the normal program line selection circuit 20 is activated, and at this time the subject brightness becomes EVO-B.
When the voltage is within the range of V19, the display circuit 5101 enters the operating state and displays the pictogram y4a in FIG. 3 by lighting it. When the subject brightness is outside the above range, 8101 repeats activation and deactivation at the same timing as the oilcs cycle, flashes the pictograph 4a in FIG. 3, and warns the photographer.

Next, release button S when selecting each program mode.
The operation when W2 is set to ONL will be explained.

When you select a shooting mode other than 2 seconds selfie mode or 10 seconds selfie mode, a low level is applied to both input terminals of NORI.
The output becomes high level. At this time, if you turn on the release switch SW2 using the release button 3, the AND gate A
A high level signal is applied to both input terminals of ND16,
The AND gate AND16 outputs a high level, and as a result, the output of the OR gate 10 also becomes a high level. At this time, the output of the OR gate 0RIO switches from a low level to a high level, and at this rising edge, the one-shot multivibrator O82 is activated and a high level signal is output for a short time. As a result, the transistor T R
1 is in an operating state, the electromagnet Mg+ is energized, a release member (not shown) is unlocked, and a series of release operations are thereafter performed.

Next, the operation when the release switch 2 is set to ONL when the 2-second self-mode or the 10-second self-mode is selected will be described.

If you select either 2 seconds self mode or 10 seconds self mode, flip-flop FF6 or FF7
Since one of them is outputting a high level, the output of NOR1 (NOR1) becomes a low level. As a result, the output of the AND gate AND16 is also at a low level. When the release switch SW2 is now turned on from OFF'F, a rising signal is applied to the 8FiT input terminal of the counter 00UNT1, the contents of the counter are cleared, and the counter 00UNT1 starts counting. If you have selected 2 seconds self mode, the Antogame) AND
0LK opens and outputs a square wave with an oscillation frequency of 5.
IO output is 00 through OR9
Input to the input terminal of UNT1. counter 0
0UNT 1 counts 10,000 rising edges and outputs a high-level signal for a short time from the Q output after counting. During this time 10,0OOXI15X10
”= 2 seconds.

In addition, when the 10 second self mode is selected, the AND14 opens and the output of the oscillator 0LK9, which outputs a square wave of the oscillation frequency iKIh, is sent to the OLK input terminal of the counter 00ONT1 via the OR gate OR9. input. At this time as well, the counter outputs a high level to the Q output after counting 10,000 shots, but in this case, 10.000 x 1/103 = 10 seconds. 2 seconds self mode, 10 seconds self mode,
In either case, the rising edge of the Q output from the counter C0UNT1 is applied to the 8 input terminals of the one-shot multivibrator 082 via the OR gate 01o, so the one-shot multivibrator 0
82 is operated, and the transistor TRI is turned on as in the mode other than the self mode, the electromagnet Mgt is energized, and a series of release operations are thereafter performed.

In the photometric circuit 19 of FIG. 6, VIO is a constant voltage source,
Operational amplifiers (hereinafter referred to as operational amplifiers) OPI and O, which will be described later
A bias voltage is applied to the non-inverting input terminal of F3. V
2O is a constant current source, OPI, OF2.0P3 is an operational amplifier, 1) 1 is a temperature compensation diode, and D2 is a photodiode which outputs a photocurrent proportional to the subject brightness. D3 is a diode for logarithmic compression, Pl is a hodister, ■Mo1 is an Sv information resistor that provides information proportional to the film sensitivity, I
t, 2 is an Ayo information resistor that provides information on the open F value of lens 2 attached to the camera body in Figure 1, and R3 is a resistor. The above circuit forms a well-known photometry circuit that corresponds to the EV value. Voltage VEV is output. In the normal program line selection circuit 20, the Q output from the 7 rib flip FFI is applied to the input terminal 20a. Since both the pan focus mode and the panning shot mode use the same program line, the pan focus program, program selection circuit, and panning shot program selection circuit 21 serves to select both program lines, and is connected to the input terminals 21a and 2113. The Q outputs from 7-rip, 7-four-tube FF2 and FF5 are applied, respectively. Stop motion program selection circuit and glad mode program selection circuit 22 serves to select both program lines since both stop motion mode and glad mode use the same program line, and input terminals 22a and 22b are provided with flip-flops. Q outputs from FF3 and FF4 are applied respectively. In the selection circuits 20, 21, 22, V
l 01~V103 C Constant N pressure H1 OP4~OP9 are operational amplifiers, R4-R20 are resistors, SW3.8W4゜S
W5 is an analog switch, which becomes conductive when a high-level (D) control signal is applied, and becomes non-conductive when a low-level control signal is applied.ORI 1, 0R12, and 2
4 is the or gate. Circuits 20, 21, and 22 each calculate an aperture AV value corresponding to the voltage Vgv corresponding to the EV value output from the circuit 19 according to each mode, and
Outputs a voltage corresponding to the V value. Limiter circuit 25
At 11!, F22 outputs a voltage corresponding to the AV value of F22. 7. The pressure source F2 is a constant voltage source that outputs a voltage corresponding to the AV value of F2. ．． 40MP12° and OM
P13 is a comparator, swi4 to SWt7 are analog switches, and 11 and 2 are inverters. The limiter circuit 25 applies a limiter to the voltage output from the circuits 20 to 24, and when the voltage VAV is less than the AV of F22, F
The voltage is output within a range corresponding to an AV value of 2 AV or more. In the subtraction circuit 27, 0P25 is an operational amplifier.

R58 to R61 are resistors. The subtraction circuit 27 eliminates the VAV output from the limiter circuit 25 from the VEV output from the photometry circuit 19, and VTV = VEV -V.
Compute and output AV. In the limiter circuit 28, V 1/
1000 is a constant voltage source that outputs a voltage corresponding to a TV value corresponding to a shutter speed of 1/1000 seconds, and 4' is a constant voltage source that outputs a voltage corresponding to a TV value corresponding to a shutter speed of 4 seconds. OMP14 and OR, 4P15
is a comparator, 5w1s to 8W21 are analog switches, and I3 and T4 are inverters. The limiter circuit 28 applies a limiter to the VTv output from the subtraction circuit 27.
It operates so that vTv falls within a voltage range corresponding to a TV value that is less than or equal to the TV value when the shutter speed is 1/1000 seconds and greater than or equal to the TV value when the shutter speed is 4 seconds.

0PIO, 0P28.0P29 are operational amplifiers for buffers, and the operational amplifier 0PIO provides Vgv to the selection circuit 12. In addition, the operational amplifier 0P28 selects VAV from the circuit 1.
3 and 15, and operational amplifier 0P29 provides Vyv to selection circuits 14 and 16.

Next, the operation of the circuit described above will be explained.

Since the photometry circuit 19 is a well-known photometry circuit, a detailed explanation will be omitted, but first, a photocurrent corresponding to the brightness of the subject flows through the photodiode D2, and the photocurrent is passed through the operational amplifier OP2 and the logarithmic EE line diode. Logarithm compression is performed using D3. Furthermore, by applying the output of the temperature compensation circuit composed of the constant current circuit VIO, the diode D1, and the operational amplifier OPI to the non-inverting input of the operational amplifier 2, a diode D2. Cancels the reverse saturation current of D3. Therefore, the output of the operational amplifier OF2 logarithmically compresses the subject brightness and becomes a voltage proportional to the absolute temperature. The voltage is connected to Hojistar P1, resistor R3, and operational amplifier OPa.
By calculating with , the output of the operational amplifier OP3 becomes a logarithmically compressed value that does not depend on the temperature of the object brightness.

Furthermore, film sensitivity information and lens open F-number information are taken into consideration by the Sv information resistor 1 and the Avo information resistor 2, and the output of the operational amplifier OP3 becomes a voltage corresponding to the exposure amount EV. These voltage values (VEV) are each supplied to the program selection circuit, and after being buffered by the operational amplifier 0PIO, provide Vgv to the aperture control circuit 26.

Next, the normal program line selection circuit 20 will be explained. Resistor 4, R5, 6. A well-known subtraction circuit is configured by R7 and operational amplifier OP4. R
4, 几5. When the resistors R6 and 7 all have the same value and the output voltage of the constant voltage source 101 is Vlol, the output voltage of the operational amplifier OP4 becomes VEV - VIOI.

Further, the resistors R8 and R9 and the operational amplifier OP5 constitute a well-known positive phase amplification circuit. The output voltage of the operational amplifier OP5 is 8 (1+TLr)-(VEV-Vtot), where: 8 (1+1) = A (1+HH) VIOI
By replacing =B, the output voltage of the operational amplifier OPs is replaced with the form AVEV -B. As is clear from this equation, the output voltage of the operational amplifier OP5 is changed by the linear equation of Vxv, and therefore Vlol and R1, R2
If is set to an appropriate value, it becomes possible to calculate and output the AV value along the program line of the normal program.

At this time, if the photographer has selected the normal program or selfie mode, flip 70 knobs FFI, F
F6.

Since the Q output from FF7 becomes high level, the terminal 20a
, 20b, the analog switch SW3 becomes conductive, and the AV calculation result is transmitted to the limiter circuit 25.

Next, a pan focus mode program, panning shot program selection circuit 21 and a stop motion program, gradient mode program selection circuit 22
I will explain about it.

The basic circuit operation is the same as circuit 20, but resistor R1
4. Resistance values of R15 and R20, 21 and V2O3,
By changing the output voltage of vioa, different calculation outputs can be obtained.

The circuit 21 outputs a voltage value corresponding to the AV value along the program line in the pan focus mode and the vanning limit mode. If the photographer selects the pan focus mode or the vanning limit mode, a high level will be output from the Q output of the flip-flop F2 or FF5, so the
A high level is applied to the analog switch SW4 via the analog switch SW4, the switch 8W4 becomes conductive, and the AV calculation result is transmitted to the limiter circuit 25. The circuit 22 outputs a voltage value corresponding to the AV value along the program line of the stop motion program or the glad mode program, and if the photographer has selected the stop motion mode or the glad mode at this time, 7. Lipfrost F'
A high level is output from the Q output of F3 or F'F4, and the analog switch SW5 is output via the OR gate 0R12.
Since a high level is applied to the switch SW5, the switch SW5 becomes conductive and the AM calculation result is transmitted to the limiter circuit 25.

Next, the limiter circuit 25 will be explained.

V22 is a constant voltage source that outputs a voltage corresponding to the AV value of the aperture value F22. 2 is a constant voltage source that outputs a voltage corresponding to the AV value of the aperture value F2.

The voltage corresponding to the calculated AV value is determined by the comparator OM according to the mode selected from one of the circuits 20 to 24.
It is applied to the non-inverting input terminal of P12, but if the voltage corresponding to the calculated nAV value is lower than the voltage corresponding to the AV value of the aperture value F22, the comparator OMI
)12 outputs a low level. Therefore, a low level is applied to analog switch SWI4, and 5W15
A high level is applied to the inverter 1 through the inverter 1.

As a result, the switch 5wt4' becomes non-conductive and the switch S
WI5 becomes conductive, and the voltage corresponding to the calculated AV value is directly input to the inverting input terminal of the comparator OMPI3. Conversely, when the calculated AV value exceeds the AV of the aperture value of 22, the switch 5W14 becomes conductive and the switch 5W15 becomes non-conductive, so that the voltage corresponding to the AV value of the aperture value of 22 is input to the inverting input terminal of the comparator OMP13. It turns out. The comparator OMP13 outputs a low level when the voltage input to the inverting input terminal is higher than the voltage corresponding to the AV value of the aperture value F'2. Therefore, the analog switch 5W17 is applied with a low level, so it becomes non-conductive, and the analog switch 5W16 is made conductive, since a high level is applied via the inverter I2, and the comparator OMP1 becomes conductive.
The voltage applied to the inverting input terminal of No. 3 is output as is. On the other hand, when the voltage input to the inverting input terminal of the comparator OMP13 becomes lower than the voltage corresponding to the AV value of the aperture value F2, the comparator OMP13 outputs a high level, and as a result, the switch 5W16 becomes non-conductive. Switch 5W17 becomes conductive. Therefore, a voltage corresponding to the AV value of the aperture value of 2 is output.

As can be seen from the above results, the limiter circuit 25 functions to apply a limiter so that the output voltage corresponding to AV, which is the calculation result, falls within the range of the aperture value of 22 or less and the aperture value of 2 or more.

The output from the limiter circuit 25 is sent to the aperture control circuit 26 and the circuit 13 through the buffer operational amplifier 0P28.
15 and is input to the subtraction circuit 27. In the limiter circuit 25, V22. V2 was a constant voltage source, but as shown in Figure 7, a constant voltage source (for example, 5
v) may be output by dividing the voltage using a resistor. At this time, if the output is made to slide on the resistors R, 62, and R63, R63 will be adjusted according to the open F value of the lens, and a voltage corresponding to the AV value of the open F value will be output. If you do this and adjust R62 according to the small aperture F value so that the voltage corresponding to the AV value of the small aperture F value is output, it will be possible to change the program line when replacing the lens. . In the subtraction circuit 27, a well-known subtraction circuit is formed by resistors R58 to LL61 and operational amplifier 0P25, where VEV −
VAv is calculated and output and input to the limiter circuit 28.

The limiter circuit 28 and the limiter circuit 25 basically operate in the same way, so a detailed explanation will be omitted, but V 1/1000
V4' is a constant voltage source that outputs a voltage corresponding to a TV value at a shutter speed of 1/1000 seconds, and V4' is a constant voltage source that outputs a voltage corresponding to a TV value at a shutter speed of 4 seconds. When Vgv -vAy input from the subtraction circuit 27 becomes larger than Vl/4ooo, the comparator O
The output of MP14 becomes high level, V 1/1000
The voltage is input to the non-inverting input terminal of the comparator OMP15.

The comparator OMP15 outputs a high level when this voltage becomes smaller than V4'', and a voltage of 4'' is output. In other words, the limiter circuit 25 is VEV - VAV
Cassie? It acts as a limiter to keep the TV value within the range of 4 seconds or more at a speed of 1/1000 seconds or less. The output from the limiter circuit 28 is V
The signal is provided as a TV to the shutter control circuit 29 and circuits 14 and 16 via the buffer operational amplifier 0P29.

In the above embodiment, the self mode was switched together with other exposure control modes, but a self mode switching button 7 is provided as shown in FIG. 8 (1 to 6 are the same as in FIG. 1).
To switch the normal exposure control mode, press the exposure control mode switching button 5 sequentially or by holding down the exposure control mode. In response to this sequential switching, the exposure control mode display section 4 also changes from 4C→4el→
Switch as 4d2 → 4e, → 4d, → 4C. Next, if you want to switch to self mode, press the self mode switch button 7 to A.
By switching from to 2, the exposure control mode is switched to self mode for 2 seconds, and then by switching from
By switching from to 10, the exposure control mode is switched to the 10 second self mode. Thereby, self-mode switching becomes possible with one operation (switching the self-mode switching button).

9 and 10 show other embodiments of the present invention, and are the control circuit of the camera shown in FIG. 8 when a self-mode selection switch is separately provided, and is the same as FIGS. 5 and 6. The same reference numerals are given to the parts, and detailed explanation thereof will be omitted.

NANDl is Nand gate, OR, 13 is OR gate,
I5 is an inverter. 0LKII is an oscillator that repeatedly outputs high level and low level at a constant period.

AND18 to AND21 are AND gates, and 5W22 is a changeover switch between normal mode and self mode which is linked to mode changeover button 7 in FIG.

If switch 22 is set to human position, OR gate 0R
Since a low level is applied to one end of the AND gate 13 via the inverter I5, and a high level is applied to one end of the AND gates AND18 to 21, switching between the normal program, pan focus mode, stop motion mode, and normal program mode is the first step. As explained in FIG. 5, this is possible by operating the mode changeover switch SW1. Since the low level output of inverter I5 is input to one end of the input terminal of NANDI, the output of NAND1 will be high level, so when the normal program is selected, the display will be as explained in Figure 5. The drive circuit NP2 operates. As explained in Fig. 5, if the light intensity is less than gV19 or more than 0, the display in Fig. 3 40 will light up, and if it exceeds BV19 or less than θ, it will blink at the same frequency as the output of 0LK2. Perform display. Note that FIG. 10 is simply the OR gate 24 removed from the circuit of FIG. 6. Now, by switching the switch 8W22 from the A position to the 2 or 10 position, a low level is applied to the AND18-21.
Since a high level is applied to OR13, the normal program mode is forcibly selected regardless of which mode is selected. At this time, if the light intensity is less than EV19 or more than 0, a high level is output from the AND gate AND2, as explained in Fig. 5.
The input terminal of the NAND gate NANDI is connected to the high level signal which is the output of the inverter 5 and the AND gate AN
A high level signal is applied from D2, and the oscillator 0LKI
A signal is repeatedly applied from I to NANDI, and as a result, the NAND gate NANDI outputs a repeating signal that is an inverted version of the output of the oscillator 0LKII. Therefore, the output of the AND gate AND3 is NAND
An inverted signal of the oscillator 0LKII having the same waveform as the output of the oscillator 0LKII is output. Therefore, the display circuit NP2 is ON, O
By repeating FF, the normal program display shown by the pictograph 4c in FIG. 3 will be displayed blinking. Further, when the light amount is equal to or greater than gV19 or equal to or less than 0, a low level is output from the AND gate AND2 as explained with reference to FIG. This output is Nantes gate N
Since it is input to ANDI's 1 input terminal, it is difficult to use.)
The output of NANDI is always at a high level. On the other hand, since the output of OR2 is a repeating signal with the same waveform as the output of oscillator 0LK2, the output of AND gate AND3 also has the same waveform as the output of oscillator 0LK2, and as a result, display circuit NP2 is turned on.

OF F tt a repeat, Pictograph 4C in Figure 3
The normal program display indicated by is blinking.

However, by setting the frequency of the oscillator 0LKII to a different frequency from the frequency of the oscillator 0LK2, the photographer can determine that the camera is in self-mode if the oscillator 0LKII blinks at the frequency of the oscillator 0LK2, and the photographer can also determine that the camera is in self-mode when the oscillator 0LKII blinks at the frequency of the oscillator 0LK2. When this happens, it can be determined that the amount of light is inappropriate and the exposure will not be proper, regardless of whether it is in self mode or normal mode. Note that in other embodiments, the pictographs 4a*4b in FIG. 3 are not displayed.

As explained above, according to the present invention, even beginners can take pictures with image effects in mind by switching to a predetermined exposure control mode that takes into account image effects and expansion of the shooting range with respect to subject brightness when setting the self-timer. This reduces the need to consider subject brightness.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a multi-program automatic exposure control camera that does not show an embodiment of the present invention, Fig. 2 is a program diagram of the camera shown in Fig. 1, and Fig. 3 is a mode of the camera shown in Fig. 1. A detailed diagram of the pictograph on the display, Figure 4 is a control circuit diagram of the camera shown in Figure 1, and Figure 5 is the switching circuit 2 of Figure 4.
6 is a detailed diagram of the display drive circuit and release circuit. FIG. 6 is a detailed diagram of the selection circuit and limiter circuit of FIG. 4. FIG. 7 is a circuit diagram showing a modification of the constant voltage source of the Norimittar circuit shown in FIG. 6, FIG. 8 is a plan view of a multi-program automatic exposure control camera showing another embodiment of the present invention, and FIG. FIG. 8 is a detailed diagram of the camera switching circuit 0 display driving circuit, and FIG. 10 is a detailed diagram of the camera selection circuit and limiter circuit shown in FIG. 1... Camera body 2... Lens body 3... Release button 4... Exposure control mode display section 5... Exposure control mode switching button 6... Metering button 7... Self mode switching button 11...
- Selection signal generation circuits 12 to 18... Display drive circuit 19... Photometry circuit 2
0, 21, 22... selection circuit 23, 24...
・OR gates 25, 28...limiter circuit 26
...Aperture control circuit 27...Subtraction circuit 29...Shutter control circuit 0R13...OR gate AND 18~AND21...AND gate applicant
Canon Co., Ltd.

Claims (1)

[Claims] A multi-program automatic exposure control camera that can be switched to various program modes is equipped with a switching circuit that switches between self mode and normal mode, and when the switching circuit is switched to self mode, a predetermined program consisting of various program modes is provided. A multi-program automatic exposure control camera characterized by having a circuit for automatically setting the mode.