JPS5879234A - Display for camera - Google Patents

Abstract

PURPOSE:To permit displaying of two kinds of exposure values with simple constitution by using one of a shutter second time and an aperture value as a main displaying exposure factor and the other as an auxiliary displayine exposure factor and displaying the auxiliary displaying exposure factor as well selectively on the same display according to manual operations. CONSTITUTION:When a manual switch SW11 is turned off in the stage of a programed AE mode, a terminal T19 goes to a high level and the terminal X5 of a signal selecting circuit 46 goes to a high level via an AND gate G18, then the shutter second time which is the automatically controlled main displaying exposure factor inputted to the terminal P5 is selectively outputted and is displayed on a display 5. When the switch SW11 is turned on, the output of an inverter INV1 goes to a high level and the terminal X6 of the circuit 46 goes to a high level via an AND gate G20, then the aperture value which is the auxiliary displaying exposure factor inputted to the terminal P6 is displayed selectively on the display 5. The same holds true of the other mode, thus two kinds of exposure values are displayed with the simple constitution of not requiring two sets of displayes, etc.

Description

[Detailed description of the invention] The present invention relates to a display device for a camera.

Conventional camera exposure factor displays require a dedicated aperture display and a dedicated shutter time display to display aperture value (AV) and shutter speed time (TV). When the display device is composed of a light emitting diode (LID), a large amount of power is consumed for displaying, which causes problems in terms of battery life. Furthermore, if the display device is composed of a liquid crystal display element (LCD), the problem can be solved in terms of power consumption. but,
Static drive is best for the display set '11117' of a camera using an LCD, considering the operation at low silver levels, but in that case, if you prepare two display units for the aperture value and for the time of printing, the number of wires will be reduced. It has grown into a small size like a camera.
For those that require K, a line is required for implementation. Furthermore, if one display device' is provided exclusively for two types of cypress, there is a problem in terms of the cost of the drive circuit and the display device.

The present invention F@ eliminates the above-mentioned drawbacks and provides a nine-camera display device.

The present invention will be explained below based on examples.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. Photography lens! The aperture opening IIFi of 21 is controlled by the aperture control mechanism 2. A photodiode PD, an OP amplifier Al, and a logarithmic compression diode DIFs constitute a photometry circuit, and a reference voltage 0i is applied to one positive input of the OP amplifier A1.
It is biased with a voltage f proportional to the absolute temperature of the EA.

The resistance value of the variable resistor VRI can be determined using the film sensitivity setting dial (
(not shown) is set by K and is proportional to the absolute temperature and supplies the required current to the variable resistor VRI. The terminal voltage of the ninth variable resistor VRI is proportional to the absolute temperature. A terminal voltage of a variable resistor VRI is applied to a positive input terminal of a 90P amplifier A,
@Op amplifier A■ is connected to a negative feedback loop, and includes a nine-position compensation diode Dl, and a constant current tI1. which supplies a current with no temperature characteristics to the diode DsK. The source Is acts to cancel logarithmic punctuality. The output voltage of the oP amplifier A is connected to @1 storage capacitor C via the first storage switch BWI.
IK is applied.

The first memory switch gWt is linked to, for example, a quick return mirror, and turns KifON (when the mirror is down) when the photographic object light is normally incident on the photodiode PD, and KopF (when the mirror is up) just before it stops being incident normally.

The resistance value of the variable resistor VB corresponds to the open aperture of the photographic lens. The photographing lens may be fixed to the camera body or may be replaceable (in this case, there are different open aperture diameters depending on the 191'1liK of the interchangeable lens). The constant current source is is proportional to the absolute temperature and supplies a current to the variable resistor vR1. Therefore, by adding the output voltage of OP amplifier A and a voltage corresponding to the open aperture diameter, nine voltages are applied to the positive input terminal of follower amplifier A. The output voltage of the follower amplifier A1 is applied to the second storage capacitor C- via the second storage switch SW2. The voltage across the second storage capacitor C is impedance-converted and outputted from the 7-o-9 amplifier A4. A common mode amplification amplifier is constituted by the resistor is, R4sR, and the OP amplifier sK. And oP amplifier A
I generates an output voltage that is in phase with the output voltage of the OP amplifier A, using the voltage of the second memory capacitor CS (the output voltage of the follower amplifier A4) as a reference voltage. The amplification factor at that time is determined by the ratio of the resistors Rs, R4, and R-. The switch 8Ws connects and disconnects the resistor Rst' between the follower amplifier and the resistor R4. The shutter speed selection switch 8Wl, which is linked to the shutter dial of the camera, is connected to a predetermined position Kll of the resistor ladder Rm and has nine terminals.
Select one of 1. The resistor ladder Its is powered from the power source E-. The nine terminal voltage selected by the switch 8Ws is the terminal bK% of the switch 8W4, and the - terminal voltage is fixedly applied to the terminal aK of the switch SW4. The switch SW4 outputs the voltage of either terminal a or b to the connection point PiK.

゛The comparator CP1 has the output voltage of the OP amplifier S as an inverting input, and the voltage at the connection point P1 as a non-inverting input,
When both voltages reach a predetermined relationship, the aperture magnet Mfl is excited via the wired OR. The comparator CPI has the output voltage of the OP amplifier A as an inverting input, and t
The voltage at the terminal (corresponding to the high-speed limit sensor time) is used as a non-inverting input, and when both voltages meet a predetermined relationship, the magnet M1v1 is excited via the wired ORV.

Switch 8W4 is connected to terminal a in program AI mode.
When the programmable program mode #t% shutter priority AH mode and manual shutter speed mode are selected, the terminal bt- is selected, but when the aperture priority mode is selected, the #i terminal 1-b is selected. That's okay, switch B
W selects terminal a for programm E mode, programmable programm E mode, shutter priority AI mode, and aperture priority mode, and K selects terminal a for manual shutter speed mode. . variable resistance V
A series circuit of RI and the constant current sink source X4 is connected to the output terminal KII of the OP amplifier A.

The variable resistor VR is linked to the preset aperture of the lens, and is the number of steps between the lens' open aperture value and the preset aperture value of 9! Change the resistance value in proportion to. Constant current sink source! ! A current proportional to the absolute temperature flows through the resistance VRaK, and the point P is connected to II.
.

After the aperture 1 is held at a predetermined aperture, the voltage of the control circuit 3 is changed to the first storage switch sw by raising the mirror.
The shutter speed is regenerated according to the voltage at terminal a or b of switch SW- at that time. That is, in response to the start of running of the shutter front curtain, the trigger switch SW4 turns OjF to start integration by the integrating capacitor CS, and this integrated voltage has a predetermined relationship with the voltage at terminal a or b of the switch 8W-. Excite the control magnet MKfl. As a result, the shutter rear curtain starts moving and completes the exposure @1! The shutter second time reproducing circuit consisting of the IJ control circuit 3, the capacitor Cs, etc. may be constructed either by a known analog circuit or by a digital circuit.
W is ON%Off in opposite phase to the first storage switch 8Wt.
F, and the magnet M port is not energized except when controlling the reyatsuta curtain. Also, the aperture control switch SW is ON until the @2 memory switch 8W switch is turned OFF and the shutter control switch SWs is turned ON from the 9th point. , 0FIP is maintained from when the shutter control switch SW is turned on to when the second storage switch 8W is turned off. Power supply EB is a power supply for the circuit system.

In mode E, either terminal a or b may be used. Switch 8W selects terminal a in program AE mode, programmable program AE mode, shutter priority Ale mode, and aperture 9 priority AE mode, and selects terminal Ka in manual shutter speed mode.

Variable resistance VRs and constant current sink source! The series circuit of - is connected to the output terminal of OP amplifier ■. Variable resistance Vll
= is a turtle that is linked to the lens's preset aperture, so
The number of steps between the lens's open aperture value and preset aperture value is 11i.
The resistance value can be increased in proportion to K. Constant current sink source! The current is proportional to the absolute temperature and flows through the resistor VR4. The voltage at the connection point P indicates the value obtained by subtracting the voltage between the terminals of the variable resistor VR4 from the output voltage of the OP amplifier A. Switch SW• is terminal pvt in program AI mode, terminal PPv% in programmable program Affi mode, and 1 in shutter priority AE mode! Terminal 8 and terminal A are selected in the aperture priority AI mode, and terminal Ml' is selected in the manual shutter speed mode. Latch switch 8Wl
* is turned off when the second storage switch 8Wl is turned off, and turned on when the first storage switch 8Wt is turned on after exposure is completed, during which time the display on the display S is latched. The display changeover switch 8W■ is linked to the display changeover member (not shown) K on the camera body, and is turned off in steady state.

The display switching member is ON. The switch 8W is turned ON when the display switching member is pressed with a finger, and turned OFF when the suppression is released.

The first factor input terminal T of the control circuit 4 is the voltage at the connection point P, the input terminal T3 is the output voltage of the 7-olower amplifier 1, and the input terminal T is the output voltage of the OP amplifier A. , and the voltage at the connection point PR is input to the input terminal T4, respectively. Similarly, the display mode control is manually operated.
is the terminal P and the resistor R1, the input terminal T is the terminal PP and the resistor R11, and the input terminal 〒1@ is the terminal S and the resistor R■
The input terminal 'I'll is connected to the terminal A and the resistor R1, and the input terminal T1m is connected to the terminal M and the resistor R14. The control output terminal TI of the magnification m circuit 4 is the follower amplifier A4, and the output terminal 〒6 is the comparator C.
Pl and output terminal! 1 generates logic outputs for controlling activation and inactivation of cossiparators cp and O, respectively.

Mode display output terminals 〒■-T11 are connected to mode display elements 6-IOK, respectively.

A digital display 5 with a four-digit seven-segment display element and an additional display element digitally displays the exposure factor based on the signal transmitted from the control circuit 4.

The operation will be explained below. In the explanation, exposure factors such as aperture value and shutter speed will be expressed as apex display values.
Ninth, the relationship between each signal voltage V and each apex display value can be expressed as Vm1m+αD, where El is a constant voltage unrelated to the apex value, and α is a conversion constant when converting the apex value into voltage, so Each signal voltage V corresponds to the apex value.Therefore, in the following explanation, it will be explained as V■D for convenience.
It will be explained as follows. Chiyoshi, the maximum aperture value of the lens is AV-A.
It is set as V-9 (F22).

(1-13 AI operation in program AE mode: At this time, switch sW4*8W@ selects terminal a separately. Also, assume that switch 8W- is ON. At this time, the preset aperture of the lens It is assumed that the aperture 91 is controllable from the open aperture to the minimum aperture.

Also, for convenience of explanation, the output TIwT@ of the control circuit 4 is outputting "@H" and the OP amplifier A4% comparator C
It is assumed that Pt is operable, seven output terminals are outputting @L#, and comparator CPs is inactive. On the helmet, the preset aperture product is F16 (AV=
It is assumed that the maximum &29 value set in s8) and which is difficult to narrow down is AV=18.

Now, before the release operation, the aperture 1 of the lens is at its open aperture, so if the aperture value is AVo, the subject brightness is Bv, and the film sensitivity is Bv, the output voltage VA of the OP amplifier 1 is , VA, -(flV-AVI)+! IV − (1), therefore the output voltage VAI of the follower amplifier 1
is VAI "IB V + 8 V - (Ri. The output voltage VA of A4 is equal to the voltage vAI.OP
The output voltage VAI of the amplifier l is VAs-(1+W)VAs qVA4
T is the shutter time corresponding to the voltage generated in
V.M.

Then, the voltage V at the connection point PI is rrm@@ Vrrx＊Proverb-TVx@l…(4) It is.

If the release operation is performed in such a state, the second
When the memory switch 8'Wl is turned off, the second memory capacitor C2 stores the voltage expressed by equation (2), and the follower amplifier A4 also outputs this. The aperture control operation starts in the subsequent lake sequence, and shows 411 results depending on the magnitude relationship of AV, AV, AV, and the magnitude relationship of TV, , TvM, and x. However, AV is the aperture value to be controlled, AvM is the aperture value (maximum possible edge value) corresponding to the minimum aperture set by the preset aperture value, and Tv
M and x are the upper limits of the shutter speed.

Medium Av, <av, <Ay, TV, ≦TV, , x+DB
- At this time, the aperture 1 is narrowed down and the output voltage V of the OP amplifier A is VAN! (Ilv-AV')+8V-(6
) (however, MU V′ is a duck that collectively refers to the occasional reduction value in the middle of &2 extraction), OP AMP S
The output voltage VAs is as follows.

The comparator CPl is the output voltage VA of the OP amplifier AI,
When and the output voltage vrFM@@ of the connection point pt become equal, 1'H1 is output to excite the magnet Mg@, and as a result, the a-intrusion is prevented. The aperture value at this time is 4V. Therefore, using equations (2) and (6), the aperture value AV can be expressed as follows.

When the aperture>1vII control operation is completed, the first memory switch 9W
Since l is OFF, the first storage capacitor C, has (
8) VAI -B Y-AM of OP Ambum $ shown in the formula
, +8 V - (According to the 811 pex calculation formula, BY + 8 VI 1 ml TV + AV, so the shirt time T controlled by the shirt time reproduction circuit.
V, is (7), (from formula 83, da TV −−(BY+8V−TVM,,) −(9)
p 1+η.

---AV, TVp and 1+η when set to 0,5
The relationship between p is shown in the straight line (a) in Figure 2.
), and layer l@1 ivy second time TV is given by TV ao, 5 (EV+TV,,
, ) P p You can live a long life. At this time, -O,S straight line 1 +η (a) OM, Y indication L, TV, , , also determines the time in seconds at the intersection of the straight line indicated by EV-ot' and straight line (1). ＼ is TV-2.

M・− (iil AM <AV,,TV,≦TvJfjl
This is straight from Figure 2! (According to al., there is a case (EV<4) in which proper exposure cannot be obtained unless the soft-sho 1 is opened beyond the open aperture (EV<4). However, since the aperture 1 cannot be opened beyond the wide-open aperture, AV TV is the second
It is controlled as shown by the straight line in the figure.

The output voltage of the OP amplifier when the throttle is opened is VAs-(1
+v)(BY-AY +11V)-1(BY+8V)・ Since the voltage at the connection point PI is shown by equation (4), in this case, AV-(
VK is on. Therefore, as soon as the release operation is performed, the magnet MIS
is energized and locks the diaphragm 1 at the open diaphragm aperture.

Thereafter, the #Il storage switch 8W is turned off, and the first storage capacitor CI stores the output voltage vA of the OP amplifier A expressed by equation (1). Based on this, the shutter speed reproducing circuit controls the shaft speed, and the shaft speed tv at the time of the turn is given by TV, m1V-AV, +8V-01.

After all, V = -AY, TV = BV-A
Y +8Vp (I P ・Trout 7
The aperture value and shutter speed are controlled so that V, , .

GiD AT,<AT,,TV,≦TV,,,O and self;
Is this a squeeze? 1 to the minimum aperture diameter - 4
This is the case when rFj@1 holds the relationship vAI>v. Since the aperture p aperture cannot be stopped down more than the small aperture corresponding to the aperture value AV set in the preset number, AV and TVp are controlled as shown by +[*(al) in Fig. 2. This is the control action that occurs in the case of EV)18.

The output voltage of the OP amplifier AVs when the narrowing down operation is completed is VAI - (BY-AV, +8V) -' (
11) Therefore, the shutter speed TV□, controlled by the shutter speed reproduction circuit at the time of conversion, is TV −
BY-AY, given by +8V - (12)M. In other words, AV,-AY,,TV,! I
The aperture value and shutter speed are controlled so that IBY-V+8V-TV.

7 V,..., wx@, and the exposure of tkk and tkk is controlled as shown in FIG. That is, AM<AY,
When <・AV, (8), as is clear from equation (I), the layered time Tvl@@ is fixed, and the value AV
is controlled to give proper exposure. This relationship is shown by line e(a') in FIG. When AM < AY, the aperture value of K is fixed at AM, AV, and the shutter speed changes from TV, , -BY-AY, +SV.
K modified and lete controlled゛, this relationship is the third straight line <
It is indicated by b'>. When MM<AV, C), the aperture value is fixed at MM VK, and the shutter speed is adjusted and controlled by MMTV, . This relationship is straight in Figure 3 - (@')
It is indicated by.

R art ! -, so [111(a)OR, +R in FIG.

It slows down by changing am. This means that the combination of aperture value AYp and shutter speed TVp for a certain Ev value can be made variable.
1 (however, TvM, x is the highest speed of the controller speed that can be controlled by the controller speed reproducing circuit 3): Since there is a limit to the speed of the controller speed on the high speed side that can be controlled by the controller speed reproducing circuit 3, When the second TVp exceeds this limit value, there is a possibility that proper exposure may not be obtained. Therefore,
At this time, if the aperture 1 is in a state where it can be narrowed down to history more than the aperture 1) @kVp, the result is 1! By narrowing down the exposure to TvM, it is possible to obtain proper exposure even at the limit shutter speed TvM,x.

For example, when making Rayatsuta TV, , x=l Q(1
/ 100100O, ), and L/:/su (2) preset aperture break or AV-9 (F22) is selected according to 11(a) of Figure 2.
EV-=-19 and IC must be TV xl 1.5, Av, +ms, s Te side, however, since the layer seconds are limited by TV = "IO, fjX then Tvpxl o , AYp=m9 ”t
“1lllljll.

The aperture value AY given by (1) and the shutter speed TVp of 82H are as shown in equations [8) and (9), respectively. . Further, the shutter speeds 'rv 'rv, given by direct numbers (b) and (·) in FIG. 70-Control circuit 4 calculates AV' -==r (BY-HIT-'rV, ,, based on the input to input terminal 'rl, T4)
) -(1B)TV""(1()(BV+8V-'
! 'V, , ) - (14) ν is calculated. However, the constant r occurs in the control path 4 and is 1+W. 1 Also, the input to the input terminal Ts is the equation (1) O 迩p, which corresponds to the second time TV, where the input is simply 00 2. In addition, the input to the input terminal T1 is the voltage vTWIN, V, , , -BY-AY, +8V at the connection point p, -(15)
It is. As is clear from equation (12), the voltage at the m-line point P1 is the shutter speed TVAM that provides proper exposure for the aperture value AvJII corresponding to the minimum aperture.

The control circuit 4 also controls the maximum aperture value that can be narrowed down based on the input from the input terminal TI, 'I's, (BY+8V) - (
Compute BY+8V-AV, )-AM, -(16). Furthermore, the control circuit 4 receives information on the limit shutter speed TvMIX from a terminal n or generates it internally as fixed information.

Similarly, based on the inputs of input terminals Tl and TI, the open aperture value, (IIV+8V)-(BY+8V-A'V,)-AY,
−(17) is calculated. Further, AY -BV+8V-TV, , x-(1g) is calculated from the input of the input terminal 'rmaro and the limit shutter time TvM,x. However, AV' is an aperture value that provides proper exposure for TVM□.

Therefore, when TV '<'rv, □, the output terminal T
s, 'r@@H"t', output 77 terminal T v K
@L1 is generated respectively to enable the operations of (:) to [phase]. Mafl-hV'>AVI1%TV,'>
When TV, ,, output terminal T, %T@Pc” L
"H1" is generated at the output terminal T.

Output terminal Ts s T @ノ”L 'K YO')
, -゛Ft lower amplifier A4, comparator CPsti
The p comparator CPs becomes inactive, and the p comparator CPs becomes active due to @u,” of the output terminal T1.
1 acts as a follower amplifier. Now, when narrowing down is started, the output of OP amplifier A is
, so similarly to equation (6), VAI mVA
, ■-The non-inverting input vrrx@H of the -tater CP■ represents the limit shutter time TVY,X. That is, vrF#@l-TvM
It is AX. The comparator cp- is TV, , = (
BY-AY')+8V-(19), the output is set to "H" and the magnet Mgl is excited to prevent narrowing down. The aperture value of this color is AV of formula (]8), '
Therefore, the voltage stored in the first storage capacitor CsK is VA* = BV-AY' +8V = (2
0). Therefore, the player's time is controlled so that it becomes TV, □. That is, the shutter IX priority AI mode is set in which the aperture value is determined according to the shutter speed TV. The relationship between the aperture value and the time of layering at this time is expressed by the straight line 4I(d) of the 4th vA.

The display operation before the release operation differs depending on the above operations (11 to Qψ).

When 'av, <Muv, <Ay, tv, ≦TvMAX; In this case, in response to input terminal T- being @H1, output terminal 〒11 becomes @H' and display Ia6
lights up to display the letters PV.

This indicates that the program is in E mode and that the output is controlled in 0 shift (a) K 8 TS'C. - 10,000, when the switch SW2 is OFF, the calculation result of equation (14) is transmitted to the display 95, and the shutter time TV' (s=TV,) is digitally displayed. Compared to this, the color when switch 8Wll is ON is (13
) calculation result of the formula is transmitted to the display II5, and the value
l(WAvp) is digitally displayed.

(Iil' When AYp<AV,,TV,≦Tv11Jx; Display 116 is lit by ``H#'' of output terminal TI. Also, from the calculation results of equations (13) and (17), it is determined that AY<Ava. Then, the output layer TI [“H,L”
The display 8 is made to blink by outputting alternating signals. As a result, the ground is aligned with the straight line 1b) in country 2 (Fig. 4) or Fil.
e) It is displayed that it is controlled along K. On the other hand, when the switch 5w1l is OFF, the shutter speed #TvPAO corresponding to the input BY+8V-AV of KFi (the input terminal shown in equation 10) is set to the switch swl.

When the switch is ON, the calculation result of equation (17) is transmitted to the display 5. The display 5 digitally displays the current time TV, or the maximum aperture value AV, v.

(+i' When AVM<AM, TV, ≦TvMlx; The display 6 lights up due to @H' of the output terminal T'ty. From the calculation results of equations (13) and (16), AY,
<AYp is determined, an alternating signal of @H and L' is output to the output terminal T14 to cause the display S to blink. This allows the programmable program AE mode and the exposure to be
Straight line (b) in the figure (Figure 4) or lel K l'l
ij indicates that it is controlled. - million, switch 8
When WB is OFF, the input terminal Ti O input BY+8V-AV, which is shown by equation (12), corresponds to the second time TV, and when switch 8W is 1g 0N, KFi is the calculation result of equation (16). is transmitted to the display 5. In response to this, the display S shows the time in seconds 〒v,
jll or shibori? [Display AM.

When one ψ' AV, < AMp, TV, ≧ dvMAX;
Display a6 lights up due to "H" of output terminal T1m and i
Ru. (14) When TV, ≧TvM, xAX is determined from the calculation result of equation (14) and the limit shutter time TV, the output terminals Tl@JIC@H and L''' alternate symbols are output and the display 8 blinks. This indicates that the exposure is controlled along the straight line (d) in Figure 4. - When switch SW is OFF, the limit layer time TvM, x is set, and when switch 8W11 is ON, Sometimes, the calculation result of equation (18) is transmitted to display -5.
Displays vMAX or 8-value AV,'.

AI and display operation at this time: At this time, switch BW, terminal S, switch SW-
selects terminal 1. Switch 8W selects terminal PP. ', switch gay is 0F
FI, it is assumed that there is.

The switch 8W is the terminal! 9 voltages y , , y 7 k' ′ are f
r M @ 1 r r M @ 1 switch S
The connection point PIK is conveyed via W4. Therefore,(
9) As is clear from the equation, the shutter speed selected by the switch 8Wsl/C is TVM,...~TV,...!
When it changes to 1, EVgO is set according to the upper path, and the next shutter time changes to TVM, .about.TvM,-. Therefore, the straight lines in Figure 2 move in parallel, as shown by lines mht' to a1' in Figure 5 (note that they are shown in Figure 5). At this time, within the control rotation 4, the ag operation is medium AV, <AY, <AYM.

(1) When AV, <AT, (IIIAV, <AY, and 1% aav, <AV, TVp≧TVII, x), the same procedure as in the E mode is performed. However, the aperture value AM and the shutter speed V given by equation (7)% (9) change depending on the terminals 3 to . selected by the switch BW Hatake. Also, an input terminal! The input of 4 is the terminal selected by switch 8W3.
According to 'rv,,,~dingvM,. Since it changes in O, accordingly (13), (14) AV according to 2,',
TVp'In calculation and determination of TV,'≧TvMlx are also performed at the same time.

At this time, the relationship between the OIR value and the shutter speed is as shown in FIG. That is, the aperture value is AV, <AY, <AM
If the current time is TV, ≦TvMIX, the aperture value and shutter esti connection point p, o voltage vrFJI
I@1~vrFMam(iv,,,~'rv,In
) according to the direct 1111 a @ ' ~ @ , #&Cf
It is controlled in eight ways. Also AY <AY,, TV.

≦TvM, x and t&d are direct m1(b')KrEI')
Then, when AM < AT and TV ≦ TV, the straight line M p P MIX (
e') After K, the aperture value and shutter speed are controlled. Historically, as represented by straight lines a and #, when AM yo〈Av, KTVp≧'rvM, From AV
' is modified to control the door.

Next, the display operation will be explained.

When AYo<AVp<AV,,TV,≦TvMIr: Output terminal TI becomes 1 due to “H” of input terminal T.
H", and the display 1 lights up to display the characters PP.

Since this is K, the exposure is from direct M (1'') to (af) in Figure 5.
i#)'s Izushi 1-Katte is displayed. -10,000, when switch SW■ is OFF (
14) The calculation result of the equation is displayed on the display 5. At this time, the time in seconds is ↑V3. ．． ~ Depending on vMen, T V' (-A V p ) rot (1-r)
(BY+8V-'!'Vx@X)p (81) When ON, the calculation result of equation (13) is displayed on the display 5. The aperture value at this time is TvM, ...
, , AV'(-AV)g-r(BV+8V-'rVJ
ll, ri-(2g)p (iil' When AV,<AV,, TVp≦TV,, x; The display wh7 lights up due to the "H" K of the output terminal 〒1.Meet, (22), From the calculation result of equation (17), A
When determining Y < M V, output terminal T 14KP
(Outputs alternating signals of 1 @H, I, and blinks display S4'
let With this, the exposure is straight 1 of SSwJ! (b'
)a! Iha(e')Kfa is displayed without being controlled. On the other hand, when switch SW■ is OFF (10
Rayatsuta second time TV, given by the formula.

However, when the danger switch BWII is ON, the maximum Mp value v0 shown by equation (17) is (Ill)' A
When V,<AY,,TV,≦TVf,x; Output terminal T
The indicator 1 is lit by ``H'' of l@. Also (2
2) When the AVM (AMp) is determined from the calculation result of (to)<, an alternating signal of 'H, L' is output to the output terminal check 14 and the display 9 blinks. - 10,000, switch s Win
When is OFF, Ifi is expressed by equation (32), the shutter time TV, 'V, l? , X, f'/chi8 wtt is O
When N, the maximum aperture value AVM shown by equation (16) is displayed on the display 5.

−ψ'AVM<Avp, TV, ≧TV, ! When:
The display Ia7 lights up due to the "H" level of the output terminal rts. MafC (23) calculation result and limit layer second time T
Determine TV≧TV from V MIX
p MIX Then, alternate signals of @H and L' are outputted to the output terminal TI, and the display set' and a disappear. This indicates that the exposure is controlled according to the direction (d") in FIG. is ON
At this time, the display 115 displays the aperture 61 [AV,', which is the calculation result of equation (18).

[3] AI and display operation in shutter priority mode: At this time, even if switch 8W4 selects terminal A and switch gWi selects terminal a, switch 8W does not select terminal 8.
is selected. Mayu, at this time, the output terminal of control circuit 4 is -5! ! is @L1, output terminal ↑・is outputting 1H'', follower amplifier A4s comparator CP-
is inactive, and comparator CP1 is in an active state. KFi, switch 8W when in shutter priority E mode
Manual shutter seconds selected by @↑V5.
1 - Aperture value AV that provides appropriate exposure for TV and amK
Since the aperture lt is controlled so that
k is assumed to be the one selecting vM.

(1) AV, ≦AV, ≦AT, since the output voltage of OP amplifier Al corresponds to the output voltage of OP amplifier A3, when calibration is started by the release operation, OP7 amplifier A The output of ・ changes as shown in equation (6). Tokorochi, (67 style smell f(BY-AM')+8
V corresponds to the time in seconds that increases the appropriate exposure by 4 for the aperture value being stopped down. Therefore, TV,,x! B
When Y-AV becomes +8V, the comparator CP1 outputs @H" and excites the magnet Mgl. When the aperture value of the aperture is AV, the OP amplifier A after the aperture is blocked.
, the output is BY+8V-AY -TV -TV
・(23) Since it is @M@X I, the shutter speed reproducing circuit is a switch 8W.
At the manual shutter speed selected by sWC?
When AV is <AM; At this time, the output of the OP amplifier Al before the release operation is B
Y+5V-AV,? When AV<AY, the current time TvIl * <TV.

Therefore, the output of the comparator CP1 is the release operation mK@H''.

Now, as soon as the release operation is performed, the magnet Mgl is excited and prevents the aperture stop, so the aperture value at that time is AM. Therefore, the output AV of the OP amplifier A, = TV, , -BY-AV, +8V
- (24) Open and close the shutter A O at the shutter speed TV according to (24).

(1111AY, > AV, o and I: At this time, K does not output the comparator CPIFi "H" even if the aperture 1 is stopped down to the maximum aperture value AV, and its friend, the shutter speed reproduction circuit is OP at this time. Output of amplifier As VAs-TV -BY-AY, +8V...(
25) 14M Open and close the rayatuta in response to the 14M K.

Next, the display operation will be explained.

(11AY, ≦AV, ≦AV, (2) when; input 1 child T
Since the output terminal 'I'll outputs @H'' in response to I being 1H'', the display 8 lights up and displays the character s'4.

This allows the shutter priority AIC mode and the AV
, ≦AV, ≦AvM. −
When the switch SW■ is OFF, the manual controller second time TvM, x (input to the input terminal T4) selected by the switch SW is displayed, and when the switch SW■ is ON, the aperture value AV is displayed on the display. 51C. At this time, 1M! Since the second symbol V can be expressed by equation (22), is the control circuit 4 an input terminal? ,, Based on the input to T4, the aperture value AY -BV+8V-TV,, x - (26)
Calculate. Then, this aperture I[AV, is (16), (
17) The 9 maximum aperture value AY obtained from equation 17) is compared with the maximum aperture value AV of 120, and when it is determined that AV, ≦ AV, ≦ MU V, this MU V is transmitted to the display 1) 5.

(ill AV < AV, Throat; At this time, the display ls8 is lit due to "H" of the output terminal TII. On the other hand, the control circuit 4 calculates AY < AY from the calculation results of equations (17) and (26).

Identify the fields. And when switch 8W11 is OFF, 1
1 is the input of the input terminal T1, that is, the shutter speed shown by the equation (24) 〒v v% 筑间Swi lO Tsuchi 8 When W11 is ON, tkK is the aperture 9 value AV obtained from the calculation of the equation (17). , the 5K transmitting 0 display is the TV, . , or AV, t' digital display. Refreshingly, the control circuit is AV, <AT.

When this is determined, an alternating signal of -H and L'' is output to the output terminal TI4, causing the display 9 to blink.

till) A V , > A V , and the display 8 is still lit at this time. -10,000, the control circuit 4 calculates AV > Av from the calculation results of equations (16) and (26).
When it is determined that it is M, an alternating signal of @H and L' is outputted to the output terminal TI4 as described above to make the display 9 blink. When the switch SW is OFF, the control circuit inputs the input terminal TI, that is, the controller second time T shown by equation (25).
V, when the attached switch 5w1l is 14M ON, the aperture value AvMv of the calculation result of equation (16)
0 transmitted to display 5 Display 5 is TV or A
Display vM.

j M [4] AE and display operation in aperture priority AI mode: At this time, one of the φ deviations of the switch 5w4u terminals a and b is selected, and the switch SW port selects terminal 1. Switch Bw@rssa child A is selected. The output terminal T·sTY of the control circuit 4 outputs @L'', making the comparators CP1 and CP inoperative.

Now, when you operate the release, the comparator CP1%CPs
is inactive, the ninth magnet Mgl is energized, and aperture 1 is set to the aperture value Avp selected at the preset stage.
Narrowed down to reset. After that, the output of the OP amplifier (i.e., the input of the input terminal Tm) AVI (=TVp,...,,t) m B V -A
When Vpr@s@t+8V is stored in the first storage capacitor C@, the Berrayatsuta second time reproducing circuit opens and closes the shutter at the Rayatsuta second time Tvpr@11@t.

- 10,000, the control circuit 4 before the release operation is connected to the input terminals TI and T.
- Based on the input of the preset aperture value Avpreset # (BV+8V) - (BV+'8
V-Avpr+eset)-(27) is calculated. When the switch 8W■ is OFF, K transmits the input Tvpreset of the terminal 'rs, and when the switch SW■ is ON, the input Avpreset is transmitted to the display 5 and displayed.

When switch 8W selects terminal A, terminal Tll,
T14 is @H"totxt), the H indicator jaB lights up and the letter A is displayed. This indicates that the aperture priority AE mode is in effect.

[5] Operation in manual shutter speed mode: At this time, switches 8W4 and 8W6 are selecting the respective terminals. Switch SW- selects terminal M.

- 10,000, the output terminals T@ and TV of the control circuit 4 are outputting the @L'v ratio, making the comparators cp, , apl inoperative.

Now, when the release is operated, the comparator CPxsCP
Since the magnet Mgl is not energized at the ninth point when 1 is inactive, the diaphragm (
l[AV□01. .

It's locked in the box. After that, the shutter speed is set to 1111TV when the shutter speed is selected by the switch SW Hatake.
-The shutter opens and closes quickly depending on the TV.

-1, Before the release operation, the input terminal T of the control circuit
, l are "H1", the output terminal 71s'l is set to "H" and the display 10 is turned on.

Therefore, the letter M appears to indicate that the manual shutter speed mode is in effect. Next, when the switch 8W*t is OFF, the control circuit 4 inputs the input T of the input terminal TI to the paddy.
vpreset-! lV+8V-AV, r...
, when the safety switch 8Wll is ON, the terminal T4
Input category vJIL, x=TVM,,~TVl,! lt
'Display 1! , 5 and displayed. Note that in the calculations of equations (27) and (16), the maximum aperture [AV] is one of the preset aperture values vpr@II@t, so both calculations are the same, but for the sake of clarity, The difference is between vM and vpre+nt.

FIG. 6 shows an example of an implementation circuit of the control circuit 4.

The multiplexer 20 inputs the input voltage 'k' of terminals 71 to 4.
The signal is transmitted to the A/D converter 21, and the A/D conversion output is applied to the digital memories 22-25. Memory 25 is connected to terminal TI
A 9 decimal amount corresponding to the input voltage (BY+SV?AV)-TV is stored. Memory 24 is connected to terminal T, ? Input voltage (
gv+sv-gv) and stores nine digital quantities.

Input voltage of memory 23#″t@child Ts (BV+8V-A
M, )=TV, , is stored.

The memory 22 stores the I.X digital amount corresponding to the input voltage (TV) K of the terminal T4. Sequence controller 26 includes multiplexer 20. A/D converter 21, memory 22~
It is controlled to operate in the order of 25 clocks, and 6 clock signals and control signals are generated. The ON/OFF signal of the latch switch 8Ws is transmitted to the sequence controller 26 via the terminal tt@. On the second day of the sequence controller, the switch SW l is OFF'
At that time, the contents of memories 22 to 25 at that time are fixed and
．． Next, the A/D converter 21 is deactivated and the switch ai is turned on.
1@”When turned from OFF to ON, A/D conversion -21tl#
It is activated to refresh the memories 22-2S.

The first constant generator 2T generates a digital signal corresponding to the controllable limit layer time TvMllK on the long side.

The second constant generator 2 generates a digital signal corresponding to the limit shutter speed TvII, xK on the controllable high-speed speed side.

The third constant generator 35 generates a digital signal corresponding to the nine constant rK mentioned above. Digital subtraction ia (hereinafter referred to as subtractor) 2B is based on the output of memory 22.24 (m
v+5v-TV3. Then, calculate w=AV. The subtracter 30 is based on the output 2JK of the memory 24.25 (BY+5
v)-(nv+sv-*V,) mAv, km.

decrease) IIjII31 from the output of memory 23.24 (B
V+8V)-(BV+8V-AV, Vfi calculation fi.

Subtraction 1!33 is the output 7 of the memory 24 and the rattan 2 constant generator 28
1'et al.(BV+8V)-TV,,x! IAV,' is calculated. Depending on the output of the digital multiplication 434 #1 subtraction 29 and the third constant generation section 35, r (BY+BV-TVM, x)
mAV,...
+8V-TVM, Ri! ! sTV, , calculate x. ,
The input terminal PIKti of the signal selection circuit 46 is the output TvMAX of the second constant generation circuit 28, and the input terminal P1 is connected to the memory 2.
2 output TvM@X is the input terminal Ps K is the memory 23
How to appear on TV.

However, the input terminal P4K is the output of the memory 25 TV, M is,
The input terminal Ps K is the output TV of the subtracter 36, x is
The input terminal ps K is the output aV of multiplication @34, x is
Input terminals P, K: The output AV of the Fi subtraction hot water 30 is input to the input terminal P. The output AV of the subtractor 31 is input to the input terminal P.
・ has the output AV of the subtraction 629, and the input terminal pt
・Subtract s! 33 outputs AV,' are applied, respectively.

The ratio 11Ra3B is reduced from the output of jE4131.33 to AM
, '(M v0 or not. Comparator 40 determines from the outputs of subtractor 31 and multiplier 34 that Avpal@X<AY,
Determine whether or not. Comparator 41 subtracts! 21. Determine whether the output of 31 is ramv <mv, or l@x. Comparison @42 is subtraction aSO and multiplier 3
From the output of 4, it is determined whether AV<MuvpM@X.

Ratio *a) 43 is AvM from the output of subtraction 4129.30,
! > Determine whether it is v1. The comparator 44 is a subtracter s
It is determined from the outputs of o and ss whether V'>AYll. Compare! i41$ is the second constant generator 28 and subtraction aS@
From the output of TVp3. It is determined whether x>Tv□8. The comparison assy is the memo 123 and the first constant generator 27C.
) From the output, determine whether TV, , < TV, , 6Th. The comparator 38 determines from the output of the memory 25 and the second constant generator 28 whether TV,jl)TvM,x. Each fuzzy device 3T to 4S satisfies each discrimination condition @
When H' is unsatisfactory, 1X## is output.

Terminal 'ris is switch 8W■ is 0FJPO and @
When Hj and switch s Wml are ON, K becomes @Lm. Terminals Tl-Tl1 are each connected to 4I8 terminals P and P.
P.8. When A%M is selected by the switch SW reference, it becomes @H', otherwise it becomes @L', gate circuit Gl
~G41 and inverter INVI~4 constitute a circuit. Then, the terminal X of the signal selection circuit 46
1 is the output of the AND gate G, terminal XS is the output of the OR gate GI, terminal X is the output of the KFiOR gate G, and terminal X4 is the output of the OR gate G1. The output of
- is the output of AND gate GII, and terminal X@ is AN
The output of the D gate exe is connected to the terminal
The output of l is at the terminal X port, and the output of OR gate Gll is at the terminal X port.
The output of the terminal X.KFiAND gate l'Gl@ is set, and the output of the AND gate 018 is applied to the terminal X1. NOROR gate G1 output is at terminal T.
The output of the AND gate Gll is applied to the terminal T@, and the output of the AND gate aSS is applied to the terminal T1. Terminal 'r1. The output of the terminal Tls is the output of the terminal T14.
The output of the OR gate G44 is applied to the terminal 'rB<, the output of the terminal T is applied to the terminal T1, and the output of the terminal τS is applied to the terminal TlyK.

I will explain the operation shortly.

[1] Operation in program AI mode: At this time, terminals T・～TE■ are 1L”, so AND gate G@s
GW s Gl1%GIS1G14% 01@II
011% 016% Gmm%Gets OR gate G
The output of @ is @L1 for 1h, and the outputs of comparators 41 and 43 are unrelated to the operation.

(i AY, <AY <AY,, TV, ≦'rv,,
When x; At this time, the terminal! 4 input is TV30. Therefore, the output of the subtracter 280 is AV.

Then, the calculation result of equation (13) is output. TV
+, atvp'maro (1-r) (nv+5v-tv,
) pH・■
- Becomes Maro and outputs the calculation result of equation (14).

Comparison i14 G, 42$1AV, <AYp<AV, outputs ``L'' at the ninth position, respectively. Comparator 45 outputs ``L''
1L2 is output at the ninth point of ≦TV. Also, the comparator 44 outputs 1L", but
This is AY ≦AY ≦aVM, TV, ≦・
p TV,, zO when AV,'<AMp, AM,'<A
v9≦A? This is because there is a relationship between M. At this time, the outputs of the comparator 39 and the 1110R gate G4 are indifferent.

That is, since the output of the NOR gate Gll and the terminal T is 1Hm, the follower amplifier A4 is activated. Also, since the output of the AND gate CII s terminal T1 is "Hl", the comparator CPi is also activated. Since the output of the AND gate Glo and the terminal TV is 1L#, the comparator CP is inactive. Also, the output of the terminal "1wT14" is @H”, so the display 6 lights up.

By the way, when the switch 8W11 is OFF, the terminal '
Since Tte is 1H1, ND game FG@@*terminal
, becomes 1R#, and the signal selection circuit 4s transmits the input tv/ of the terminal Pi to the display 5. Conversely, switch 8W1
1 is O? When it becomes 1C, the terminal TI@ becomes @L" and the output of the inverter NVI becomes "H", so the AND gate Gl
The output of ・ is @L", and the output of AND gate Gas is @Hm
becomes. Therefore, the signal selection circuit 46 selects the input A of the terminal P.
Display M'@SK Transmit.

1it) AYp<AV,, TVp≦'rvM, xo
At this time, the comparator 40 is 1H”t, and the comparator 4λ45
outputs @L'. That is, NOR gate G jss
The output of the ND gate 08m is @Bm, and the output of the AND gate G is 1L'', so the 7-year-old lower amplifier A4% comparator CP1 is activated and the comparator CP嘗 is inactive.

Further, the display 6 lights up due to the output @it' of the terminal T@5T14. AV, (when MUv0, MUv'<
av, so comparator 39, -
040 outputs @H". Therefore, the OR gate Gsm outputs @H#, so the clock pulse from the sequence controller 26 is transmitted to the display 8 via the OR gates G4 and G44.Display 9 blinks.

By the way, when switch g Wll is OFF, O
Since the R gate G- and the terminal x become 1H1, the signal selection circuit 46 transmits the input TV of the terminal pm to the display 5. Conversely, when switch s wll is ON, OR gate G
- becomes the output Fi@L'), and the OR gate G,,+7)
Since the output terminal X$ becomes H'', the signal selection circuit 48 transmits the input AV of the terminal P to the display 5.

(When il AYM<AV, TV, ≦TvMAX; Comparison-42 @ for AV &< AV p
The comparator 45 outputs @L'' at the ninth position of TV, ≦TVM, □. At this time, NOR gate Gl
l, the output of AND gate aSS is 'H', and 'AN
The output of D gate GB is 1L''.T terminal T@5T
The display 6 lights up by the output "H' of 14. AV
, <AY, the output of the IR device 40 is @L" and the output of the comparator 42 is @H". At the ninth point when TV, ≦TvMAX, the output of the comparator 45 is @L". Therefore, the outputs of the OR gate atV, G4・, AND gate G4・, and OR gate GSS become @H", and the clock pulse of the sequence controller 26 is transmitted to the display 9 via the OR gate 041%G44.The display 9 blinks.

When switch 8 wll is OFF, 0.8 gate G
Since the 11w terminal X4 becomes 1H", the signal selection circuit 46F
The input TV of the i input terminal P4 is transmitted to the t' display lI5. Conversely, when switch 8 wll turns ON, the outputs of AND gate G14 and OR gate aSt become "H",
Terminal X! Set to 1H#. As a result, the signal selection circuit 4
6 transmits the input AvM of the terminal P1 to the display 5. Ratio I
The outputs of the IR devices 39 and 44 are irrelevant. At this time, there are two operations below KFi. First, A.V.
, /≦AM, then K is the comparator 39.40.42.
The output of 44 is @L#. f7'tTV.

> Because of TvMIX, the output of comparison @45 is 1H#.

OR gate ctt, AND gate ass output Fi@L
", so the output of the AND gate G41 is @L". The AND gate Gas input to the output ""H'tj of the inverter INV4 is transmitted from the sequence controller 26 to the glue lock pulse 4OR gate G4-, so the display 8 blinks. On the other hand, the display 6 is lit as described above. When the danger switch SW■ is OFF, K is AN.
The output of the D gate Gs, Kameko X, becomes ``H'', and the signal selection circuit 46 transmits the input TvMIX of the terminal PI to the display a5. On the other hand, when switch SW■ is OFF, 11 is turned off.
The output of D gate G is @L”9, A N D ke=
? G **1Z) aj force, Ill child X * e
becomes 1Hm. The friend signal selection circuit 46 has a terminal h.
? KK, AV, '>AY, C) Sometimes ratio mass, 4
The output of 0 is '''L'% The output of comparison l1144.45 is @H1. The output of comparator 41, 42, 43 is irrelevant to the operation. The output of comparator 44 is @H'', so KOB
OR gate y s G as.

Since the outputs of the AND gate G41 and the OR gate Gl become @H', the display 9 blinks. Display (to) 6 is lit. At this time, unlike when AV and '≦AY, the display turns off.

- 10,000, when switch 8W1K is OFF, AND gate G11% OR gate GHo output, that is, terminal x4 is 1
The signal is selected and transmitted to the input TvIIAXv display 115 of the circuit 46 Fill child P4. Conversely, when the switch El Wll is turned on, the AND gate G wealth 6,
The output of the θ′R gate Gll, that is, the terminal X becomes @H”, and the signal selection circuit 46 selects the input AM of the terminal P,
Communicate to Is. - 10,000,AV,'〉MuV1TV,>Tv
At MAX, the output 'rv' of the memory 2S.

is greater than TvM,x, so the comparator 38 calculates “H=V
Output. The ninth NAND gate G3 spreads @H,L to the clock pulse from the sequence controller 26.
' is applied to the signal selection circuit. This f'LK causes the signal selection circuit to blink the display (TV, □, or AvM, x) on the display 5. This shows that a normal trout extraction can be obtained. [2] Operation in programmable program AID mode: At this time, the output of the memory 22 is ↑v A'rvM throughout the selection operation of the switch 8Wl. ,.

Changes to l@1. Actually, the output of the subtractor 29 is AV,,xW
BY+8V-TV,,x(TV,,! is TV,,, ~
TVM, , &representative) The output of the multiplier 34 is AY
-AV'-rcBV+pm@x 11 av-7°v11. ! ), and the output of the subtracter 36 is TV -TV,'-(1-r)(BV+8V-p
M@X TvM, x.

Therefore, the operation is similar to that in the program mode, except that when the switch SW selects the terminal T, the display 1 lights up instead of the display 6. [3] In the shutter priority AI mode Operation: At this time, K is terminal 'rs, ? , %'rtt, tts are 1Hm, so AND gate GIsG@, G 11% G l1m
G 11%aSS%aSS%Gm1%G heat 41G11
s Goes G41s G41% The output of OR gate GI%aSS is "Lm. Therefore, comparator 3
The outputs of 9.40.42.44.45 are independent of actuation. At this time, the terminal Tl/OR gate G4. The display a) 8 is lit due to the output 1H''.

(1) When AV, ≦AY, ≦AVMO: Comparator 41
．． Since the output of 43 is 'L', OR gate aSS,
aSS, AND gate G,! , 041%G output is '
"L1. Therefore, only display (to) 8 lights up.

- When the ten thousand switch 8Wli is OFF, K is a NOR gate false @H" From K, the output of the AND gate 018, that is, the terminal introduce. When switch 8W-11 is ON, NOR game h7 G- @H'' causes A.
The output of the ND gate G15 and the OR gate Gl becomes ``H''. Therefore, Shizuko X becomes @H'' and the good signal selection circuit 4
s transmits the input TV of the terminal P, M@X to the display 05.

(11) AV, < AV, (7)! -ki; comparator 41
The output of the comparator 43 is @H”, and the output of the comparator 43 is
b. OR'r' -G@a%G 1@AND gate a
Since sp outputs @H'', the clock pulse of the lake controller 26 is transmitted to the display 9 via the AND gate G41 and the OR gate 044, and the display 9F1 flashes.On the other hand, when the switch 8W is OFF niFiA
The outputs of ND gate G1@ and OR gate G- become 1Hm. The circuit 46 whose terminal xi becomes @H' transmits the input TV of the terminal P1 to the display 5. On the other hand, 1 switch 8W
When (2) is ON, the output of the FiAND gate Gl@%OR gate ass becomes @H'', and the terminal X- becomes @H'', and the nine circuit 46 transmits the input cam v0 of the terminal P to the display 5.

(ldl AV s > AV x O*:
The output of comparator 41 is @L'% comparison - the output of comparator 43 is @H"
, OR gate Gl, aS Lu, AND gate Gl
The display 9 flashes in the same manner as described above because the output signal ``@H'' is output.
G14, the output of the OR gate aSS becomes @H'', the terminal
When W11 turns ON, the outputs of AND gate ass and OR gate G11 become @H", so the link X becomes 1H".
The next nine circuits 46 transmit the input AV of the terminal P to the display 5.

[4), Operation in e-dredging AI mode: At this time, terminal Ta = Tt・, Ti8, is @L#, so AND gate as s '@ s GV s ass, G11s
014% G11% 011% Goes G1
1% G14%Gli% Gets 011% G
11s Gmts 041% 041%G4m and OR gate G K , G I s G 1%%G ■
, the output of G41 is @L", so the comparators 39 to 45
and gate G4 s Gl s aty, ate%G1
4%GII%GI-%Gllll5G The output of the four fists is independent of actuation. Since the output of NOROR gate G4ND gate Gll and Gss is 1L", terminal T・s
The output of Tt is 1L1. The terminal T may be either "H" or "L".

Since the switch SW selects the terminal A, the output of the OR gate G44 becomes "H2" and the display 9 lights up. When the switch SW is OFF, the AND gate G1 and the OR gate 01@s Glm are 1H'', the circuit 46 whose terminal becomes @H' transmits the input TvJJI of the terminal P4 to the display ia5. Conversely, when the switch 5w1l is ON, the AND gate Gl.

OR gate Cat outputs @H#. m child X1 @
The (mouth) path 46 that has become Hm is the nA child P10 input AvM
is transmitted to the display unit 5. In addition, this and t! I have TvJr”
Tvpr@114 Bv-mu vpreset +sv
It's on.

[5] Operation in manual rear start time mode: At this time, terminals T and ~711 are 1L", so the AND gate as s Gy s Gll, G11w G14%
018% '1@s G 16% 011% ass
% G as G self・1Glfs Gl1%G 19
% G 11% G 11% GI? %04j%G4
1% G41% OR gate as s 011%
Ge11G■% ass% G44% 04%%
NOI'/-Gst(D out7Ftj"L'fK
e) "T:, jt comparison ai39~4 S.

NOR gate G4 s as s 019% ass
, MND gate Gses OR gate'Its 084
．． The output of 011wG4 is independent of operation.

At this time, since the terminal TI is 1H', the display 1) 10 lights up. Switch 8 Wig is AND with 0FP4D and @
The output of gate Gxs%OR gate 011 and G1 is 1H.
' Therefore, the nine circuits 46 whose terminal x4 is @Hm are the input TV 84M 'rv, r, , 1 of the terminal x4.

When switch 5W11 is turned on, AND gate '5s
The output of OR gate Gs becomes -H#, and the terminal X snow becomes @H
m, and input TV of 9 circuits 46tj terminal T, xm
TV,... ~Display TVx@ti・At this time, Tv
With Jrex-Tvpreset, proper exposure can be obtained.

Note that the comparator 37 is the output TV of the memory 23.

and the output TvMIN of the first constant generator are compared and TV
) The display on the display 5 is flashed by applying alternating "H, L" signals to the TV, . . . and lkKLo1M4g via the NOROR gate Gl.

When the comparator 384 sK'rv, >T'v, , Q), the display on the display 5 is flashed. The on/off switch s W may be configured to be turned on or off in response to a change in position of a release button or a set lever of a self-timer.

Figure 7 shows the display changeover switch 5W in Figure 11g1 and Figure 6.
11 is linked to the recorder button in the following '44 example.

In FIG. 7, power is supplied to the circuits of FIGS. 1 and 6 from the power source EB through a power source timer circuit composed of a transistor Qts (false), a resistor R1@, and CIK. The power switch 8% is linked to the release button of the own camera (not shown), and the display changeover switch swi, 4 is linked. At the first stroke of 9 o'clock when the release button is pressed down, the power switch sWls is ON.At that time, the display changeover switch sWll is 0FFI.

9. Press the release button (with the two strokes pressed, switches aW and 5w1B are both KONt).

Furthermore, when the release button is pressed at the final stroke of the release position, switch 8 Wl as 8 W 11
When both are KONL, the release mechanism of the camera (not shown) is operated and the exposure control of the camera is started. Switch BW14 is the latch switch sw1 in Figure 1 and Figure 6.
．． When is ON, the terminal klllK is present, and when the latch switch 8W1@ is OFF, the terminal is at terminal 1, and its switching timing is almost the same as the latch timing described above.

A display switching timer circuit is constituted by a capacitor C11% resistor R11 and a t' transistor Q. The collector of the transistor Qs is connected to the terminal Tt* in Fig. 1 and llR6.
It is connected to the. Power switch 8W1 with the first stroke of the release button! When only is turned on, power is being supplied to the circuit. At this time, the switch sW■ is OFF and the transistor Qs is OFF, so the state of the digital display is 6th.
The above-mentioned display appears in the same state as when the display changeover switch s wll shown in the figure is OFF. During the last two strokes of the release button, both switches BWIs and s Wtl turn ONL and transistor Q1, so the above-mentioned display in the same state as when the display changeover switch B wll in Fig. 86 is ON (switching, that state is Even in the position of ``100 strokes'' or in the state before compression, the transistor Qs remains ON for a predetermined time determined by the capacitor C1jw resistor Rit, generally about 1 to 3 seconds, so the display is switched during that period. .Power switch 8 w, a after being turned on once
For a predetermined period of time determined by the resistor RI* and the capacitor C1 from the time of FF, generally about 20 to 30 seconds, the transistors Q and Qs remain in the ON state to maintain power supply to the circuit. When the release button is completely pushed in and the camera's exposure control is started, the switch 8W14ij1211 is switched to the i side. Therefore, the switch SW■ is ONL, and the capacitor C? 11 is discharged to turn off the transistor Qs, and the digital display becomes the same as when the switch 1IWit is turned off. When the exposure control is completed, the switch 8W14 is connected to the terminal b@KR, so the switch 8 wll is turned on at that point.

The display is controlled by OF'F.

According to the present invention as described above, when in the shutter priority AIC mode, the aperture p value can be selectively displayed as the main display exposure factor and the time of shooting as the sub display exposure factor can be selectively displayed on the same display. Mode and aperture★When in front mode, the main display exposure factor is the shutter speed.
The aperture p value can be selectively displayed on the same display as the R display exposure factor, and the above object is achieved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIGS. 2 to 5 are outputs of the embodiment of the present invention. 6th WJ is a diagram showing a control circuit; FIG. 7 is a diagram showing another embodiment of the present invention. [List of symbols of main parts] Circuit that generates the first signal...2F, 2gCircuit that generates the second signal...35 Display...S Selection means...46 Figure 2 . , Figure 3

Claims (1)

[Scope of Claim] In an automatic exposure control camera in which one or both of two exposure factors, ie, a second time and an aperture value, are controlled according to the brightness of a photographic subject, one of the second time and an aperture value is controlled. is a main display exposure factor and the other is a sub display exposure factor; a circuit that generates a first signal corresponding to the main display exposure factor; a circuit that generates a signal No. 24F1 corresponding to the sub display exposure factor; display; and usually the main display exposure factor is displayed by the display, and the -display exposure factor is displayed by the manual operation KZ. A display device for a camera comprising means for selectively selecting the main and sub-display exposure factors as displayed by t%.