JPS5879233A - Display for camera - Google Patents

Abstract

PURPOSE:To display automatic selection of photographing modes precisely and to prevent erroneous judgement by displaying also that the aperture is above a limit value and that the shutter second time is controlled, other than a program AE mode, a shutter priority AE mode, etc. CONSTITUTION:Mode dislays 14-17 are lighted according to program, shutter priority, aperture priority and manual modes by a mode selecting switch SW'9. When the aperture exceeds a limit value in the program AE mode and the output of either one of a comparator CP2 or CP3 inverts to a low level, the output of a gate G8 is inverted to a high level by an inverter IV1 via a signal selecting circuit 4 and while the display 14 is held lighted, the display 16 is flickered as well by a flickering circuit 10, by which the aperture priority is displayed. When the aperture exceeds the limit value while the display 15 is held lighted in the stage of the shutter priority AE mode, the displaying by flickering of the display 16 is accomplished as well. The automatic selection of the photographing mode from a desired mode is distinctly displayed and erroneous judgement is prevented.

Description

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

Conventional shutter priority 5 When the aperture p goes out of the controllable range in the E mode, the controlled i! for automatic exposure expands the exposure control range! A device is known in which the element is automatically switched from aperture P to a shutter speed (Japanese Patent Application Laid-open No. 18124/1983). Also, even in program AE mode, the program area is controlled for automatic exposure! ! The number is 9 and 9, but it is known that when it is out of the controllable range of 9, only 9 is controlled.
(above, published publication). These conditions are different from the originally intended good exposure mode, so clearly indicate that you have entered such an area. If this information is not provided, there is a possibility that an erroneous judgment will be made during photographing, resulting in a loss of the chance for p1 photographing in which appropriate photographing is not performed.

As mentioned above, the present invention aims to eliminate the aforementioned drawbacks by clearly displaying the intended exposure control mode and 14 modes when the light is switched automatically. .

Hereinafter, the present invention will be explained based on an embodiment.

Figure 1 is a schematic diagram showing the O-shell hook of the present invention. The aperture p of the aperture p1 of the photographic lens is controlled by the aS control mechanism 2. Photodiode P 0% OP amplifier A1 and logarithmic compression diode DI constitute a field circuit,
The positive input terminal of the OP7 amplifier A is biased with a voltage proportional to 11 degrees absolute of the reference voltage source EA. The resistance value of the variable resistor B1 corresponds to the film sensitivity setting dial (not shown). The constant current R source 11 is proportional to the absolute temperature I, and the voltage of the variable resistor 7 set is proportional to the absolute temperature. The terminal voltage of Machiga resistor vRI is applied to the positive input terminal of 7tOP amplifier A, and @OP.
A temperature compensation diode D connected to the negative feedback loop of the amplifier A, and a constant current source that supplies a φ current with no temperature characteristic to the diode D. , is the logarithmic compression diode DI
Temperature of reverse saturation current of ! [Acts to offset percentage. The output voltage of the OP amplifier Am is [1 memory switch gW
s is applied to the storage capacitor CI. With the voltage shift resistor RIos constant current sink source 1. N-
It has been level shifted. lIl memory switch SW
1 is linked to a quick return mirror, for example, and is turned ON (when the mirror is down) when the subject light is normally incident on the photodiode PD, and turned OFF (when the mirror is up) just before the subject light is no longer normally incident on the photodiode PD.

The resistance value of the variable resistor VB corresponds to the open aperture of the photographic lens. The shooting lens is fixed to the camera body04
It may be 0, or it may be interchangeable (Ic) (there is a price depending on the type of interchangeable lens). Constant current source 1. is compared to the absolute temperature and supplies the required current to the variable resistor VR. Therefore, the output voltage of OP amplifier AI and open circuit #i! A hole voltage is applied to the positive input terminal of the follower amplifier A in addition to the towing voltage according to the diameter of the 90 mm. For the output voltage of follower amplifier A, a voltage addition resistor R11 and a constant current source are used! A voltage that is 1 due to - is added. temperature, this additional voltage is the second memory switch S Ws
to the second storage capacitor C4. Second
The voltage of the storage capacitor C4 is impedance-exchanged and outputted from the forward amplifier 4.

On the other hand, OP amplifier, transistor Qg and resistor R1
1% RII constitutes a subtraction circuit. , then 1, depending on the follower amplifier ^sO output, ft, voltage (output voltage of follower amplifier A, 8:) to OP amplifier As0aS
Depends on the power and large voltage (resistor R1 and constant voltage R1k included source xso
A voltage (hereinafter referred to as program signal voltage) corresponding to the value obtained by subtracting the voltage at the connecting point of the transistor Q1 is output to the connecting point between the resistor ILts and the collector of the transistor Q1.The variable resistor VRs is connected to the shutter speed setting dial of the camera, etc. O constant current circuit whose resistance value changes in accordance with the manual operating member of 1. is proportional to the absolute IIIWl and supplies the required current to the variable resistor VRs. At this time'
Variable resistor VR* (011111 voltage is called manual shutter second time - signal voltage.

The mode selection switch 8Ws connects terminal P when in program exposure control mode, terminal 8 when in recording priority exposure control mode, terminal M when in IRn priority exposure control mode, and terminal when in manual shutter speed mode. Sometimes the terminals M are selected respectively. A program signal voltage is applied to the terminal PK, and a manual shutter seconds signal voltage is applied to the terminal 8.

Terminals y and y are grounded. The second mode selection switch 8W is linked to the first mode selection switch 8W@) and the mode selection of the switch 8W (accordingly, the terminals P, 8.m, and M are selectively selected as described above). Switch 8w!
Terminals P2S5 and III are respectively connected to storage capacitors C and C, respectively.
K is connected, and a manual shutter timing signal voltage (variable resistor Va, O terminal voltage) is applied to the terminal M.

Comparator CPz is 0. A relationship i41 is established between the voltage applied to the inverting input terminal 0 to which the P amplifier output voltage is applied and the voltage applied to the non-inverting input terminal according to the mode selection of the mode selection switch 8W. Depending on the result of this determination, the comparator CPI outputs %HI or %LI, and controls the excitation and de-excitation of the forgiveness control magnet Mg via the switches sw and Wt.

In the control circuit 3, the second mode selection switch 8w is connected to the terminal PS.
8. Choose the one you want! (Controls the shutter speed W#.

That is, in the control cycle w11, the diaphragm 11 is held at a predetermined aperture, and the mirror is raised after the diaphragm 11 is adjusted.
? The shutter speed is controlled according to the voltage of the first storage capacitor C1 at the time of F. That is, the trigger switch 8W4 is set to 0Fli' in response to the start of the movement of the shutter front curtain.
1 starts integration by the integrating capacitor C1, and when this integrated voltage reaches a predetermined relationship with the voltage of the gl storage capacitor CI, the shutter control magnet M1 is excited via the shutter control switch 8w-. As a result, the shutter rear curtain starts moving and completes exposure.

The shutter speed control circuit comprising the control circuit 3, capacitors C1, C@, etc. may be constructed of either a known analog circuit or a digital circuit. The shutter control switch 8Ws is turned on and off in the opposite phase to the first memory switch 8W, and the magnet MK* is not energized except when controlling the shutter base.

f9, aperture] Control switch - Wsti/2nd memory switch 8W Snow is OFF From the time of L1 until the shutter control switch SWI is ON, it is ON, and the shutter control switch 8 Ws is ONI, then 2nd memory switch 8
When Wl becomes OFF K, it becomes OFF'F.

The above circuit configuration is a part related to exposure control. Next, a partial on-path configuration related to exposure display will be explained.

The series circuit of variable resistor VB and constant current sink source I is OP.
The output terminal of the amplifier is connected. variable resistance vR
4 is linked to the lens's preset aperture, and the lens's open aperture p value and preset! ! 2) A constant voltage source that changes the resistance value in proportion to the difference in the number of steps! is compared to 11 degrees in absolute terms, and the 9-sinking current is applied to the resistor VR.

Therefore, the voltage at the connection point PK is OP ampm.

Subtract the variable resistor VB and 0 terminal voltage from the output voltage to show a good value. The connection point PIO voltage is the terminal of the signal selection circuit 4! ,
is applied to 11E, the output voltage of the OP amplifier is applied to the terminal T8 of the signal selection gIII4.

The output voltage of the follower amplifier A is divided by the resistors R-1R4 and shifted to a predetermined level by the constant current source 8 and the resistor R. A constant current source I supplies a current proportional to the absolute temperature to the resistor RI'. II
The voltage at the connection point P2 multiplies the output voltage of the follower amplifier A by a coefficient determined by the currents of the resistors R1 to R1 and the constant current source I, which is 900 million. The voltage at the connection point P is applied to the terminal T of the signal selection circuit 4. Resistor R6 with the same resistance value
R0, absolute temperature [[constant current source I that generates a relative current]
and OP7 amplifier A constitute a differential amplifier circuit. Then, this differential amplifier circuit outputs a voltage obtained by subtracting the output voltage of follower amplifier A from the output voltage of follower amplifier A4. Follower amplifier A converts the impedance of the manual shutter speed signal voltage and outputs it. The output voltage of the OP amplifier A is applied to the terminal T4 of the signal selection circuit 4.

Iris 3 mode selection switch 8W-Haha, Haha Tsutomu switch gw
, c are interlocked to selectively select the terminals P1 B, M, and M in accordance with the mode selection of the p1 switch 8W. The comparator CP compares the voltage at the connection point P with the manual shutter speed signal voltage. comparator cp
Hatake Fim! The voltage at the wire point P and the voltage at the ** point PI are compared. The AND gate Gl receives the output of the comparator CPIO and the output of the terminal P of the switch 8Ws as inputs.

The output of the comparator CP and the output of the terminal 8 of the switch 8W are input to the system ND game) G. OB gate G is MND gate G1, G.

And the output of the switch 5WsO terminal M, V is input, and the output is applied to the signal selection 1 path 40 terminal x1. The output of the comparator CP is applied to the signal selection circuit 40 terminal X. The NOBOR gate manually combines the output of the AND gate G1%Gl and the outputs of the comparators cp and o.

The AND gate G receives the output of the terminal P of the switch 8Ws and the output of the NOR gate G, and outputs the output from the circuit 4.
is applied to the terminal Xs of AND game) Gsti switch SW Hatake's terminal 8Q output and the output of NOR gate G are input as 1, and the output is applied to circuit 4C) II terminal X4.

The signal selection circuit 4 selects VC#' when the terminal Xt is %HI.
When the input terminal of the i terminal TI is set to % HI, the terminal TtΩ input voltage is set to 1 terminal X, when the terminal X is % HI, and the terminal
When the input voltage of terminal TI is increased, terminal X4 becomes %H'
At this time, the input voltage at the terminal T4 is transmitted to the A/D converter 5, respectively. A, 6 conversion is5 samples the input voltage at a fixed period, and transmits it to the digital signal output q driver 6. Display 1) driven by driver 6
7 is a plurality of segment display elements 'tme 91. Various displays are performed by selectively driving the segment display elements. The output of the terminal S of the switch 8W and the output of the NOR gate G are displayed on the display T.
change the exposure display mode. That is, when the output of the driver/hammer (Nil>game) Os is %Hl, the display TK, aperture) value is displayed, and conversely, when the output is %LI, the shutter speed is displayed. The switching between the value display and the time display is synchronized with the sampling period of the Muro converter 50. The latch switch 8W is linked to the release operation and turns ON when the release is completed. The driver 6 latches or erases the display a17 by turning off the latch switch 8W, and turns the switch 8W ON again.
After a certain period of time has elapsed (a certain period of time until the mirror bounce disappears when the camera 12 is two-down 2), the vcll display is refreshed. El is a power supply for the circuit system.

The operation will be explained below. Exposure factors such as aperture value and shutter speed are expressed in apex display.

[1] Program exposure control mode: At this time, the first to third mode selection switches 8Ws~
, respectively select the terminal P.

Exposure control operation and display operation will be explained separately below.

I will clarify.

(1) Column movement before operating the shirt release: At this time, since the lens aperture j11 is at its open aperture, the lens aperture pI [at the open g diameter is AVo, the subject brightness j [tB V, and the film sensitivity is 8V. Then, the output voltage MA of OP amplifier A
, is VAt=Et+(1((BY-AVe)+8V)
=vrrto-(1). However, K1 is a constant voltage unrelated to the apex value including the reference voltage source KA(2) voltage IO, and α is a coefficient when converting the apex value into voltage.

Accordingly, the output voltage VA of follower amplifier A is VAs"lc+ + (X((BY AVo)+〇V
AVe)=E+ +(X(BY+8V) ・−・
...(2). Resistance to this voltage V! to
and constant current source 1. A constant voltage El is added to II2
Applied across storage capacitor C. The output voltage of follower amplifier A4 VA4Fi, VA4 = J+Et
+(X (IIV+8V) ”...=01).

On the other hand, the output voltage of the five OP amplifiers when the aperture is open is (1)
As shown in Figure 2, the input voltage V and the amount n at the non-inverting input terminal of the OP amplifier AS are:
V) ・i4). However, E is a constant voltage determined by the resistance blade, . . . and the sink current RK of the constant current ma source I4).

Here, if it is assumed that the transistor Q + Obox is high by an amount of light, the program signal voltage VQr is R1 snow. Accordingly, from equations (3) and (4), VQl=E1
+Kt+(!(BVfSV registert Is tend((BY
A%)+8V) )=(1-β)E, 10E, 10βff
i, -1-d(1-β)(BY-)-8V)f-0βA
v6...(5) However, β=(::.

(2) Shirt release operation and subsequent program setting control operation: Now, when the shirt release operation is performed, the diaphragm 91 starts to be loaded, and at the same time, the second memory switch and the 8W
, is turned on, and the aperture control switch SW is turned on. At this time, if VAt>VQt, the output voltage of OP7 amplifier A according to the aperture p is VA*=Et+(X((BY AV)+8V)=・(
5)'. However, AV shall be referred to as the compensation value tII at each time during the narrowing down. Also, the program signal voltage is VQ, = (1-β) lcI + EI + β, + (U 1-
11) αF/+8V moon pigeon h■-(6).

As the narrowing of the p-point progresses to VA, +VQ, the output of the comparator CP becomes %HI, and the magnet Mg, tic is energized via the p-switch 8W to prevent the narrowing. At this time, the O aperture p value Vp is calculated from a simple consideration as A V P =#<sv+sv>+& ・”= (
7) Table AV shows the change rate of aperture value Avpo for brightness BY K.
This is the level shift term for rounding to obtain p at a given Br K.

When the aperture value of aperture j11 is set in this way, the III memory switch 8W+ is turned OFF by mirror up.
24Tchi8W= becomes ONK. For this purpose, the output voltage of the OP amplifier after the value is set for the storage capacitor C1, i.e., vAIBLCI+α((BY-AVp)+8V)
-Vrrp-- (8) is stored. and,
The control circuit S connects the magnet Mg via the switches sw and 'l.
1 to lock the shutter rear curtain from running. Thereafter, the front shutter curtain starts running due to an operation linked to the mirror-up operation, and the trigger switch 8W4 is turned off. After that, when the voltage of capacitor C3 and the voltage of capacitor C1 are in a predetermined relationship, control path 3 is connected to magnet M1.
Cut off the power to [run the shutter rear curtain]. In this way, the shutter speed control is completed. The shirt time Tvp of this color is calculated from equation (8), TVp=BV+8V-AVp
・・・・・・・・・・・・ Since (9), (7
), expressed as (9)) 1. ■) In the equation, θ is the change rate of the shutter speed Trp with respect to the subject brightness [BV, sec'rvp t
- is the term for the incremental bell shift obtained at a given BYVC. As is clear from equations (7) and (2), if O</ is closed, o <% < 1, so the aperture value v11 and the shutter speed TvP are appropriately distributed for the subject brightness 1jlc. can do.

When β = 1, the current voltage is VQ + "Bi + Es + α V, ToJ),
After the release operation, VQ+-1 Jutori+αmuV. Before operating the toe-freeze, it is a static voltage that is unrelated to the brightness of the subject, and after operating the shutter, it is a voltage that corresponds only to changes in value during the aperture adjustment. AVP and TVP at this time are hvp=j<BY+8V>+”-1
CI-112α rv? ='(BV+5V)-! and Nishini” Road 22α.

The above operation is performed when an is controlled in the region of AvO<AVP<AVM.・However, Mqx is the minimum aperture p that is set at the preset aperture of the lens) and the ratio can be controlled.
The value corresponds to the caliber.

However, as is clear from equation (6), the subject brightness f (or the combination with the film sensitivity) K and therefore the AV
P<AvO or Muvl<MuV? If you do not control the aperture (aperture) in the area of However, in reality, in these two regions, the diaphragm p does not move any further towards the open end pole or the minimum aperture pole due to control. Therefore, the operation at this time will be explained.

AVp (at the time of AVo; at this time, before the shirt release operation is performed, WcV Al < V Qt has already been established, and the comparator CP1 is outputting %H1. Therefore, 1. In response to the release operation, the switch 8Wl is
At the same time as becomes ON, the magnet Mg+ is energized [to prevent narrowing down in advance. When the first memory switch 8W1 is turned off after the above-mentioned operation sequence, the Jl111 memory capacitor CIK is connected to the OP at 9 through the open-diameter diaphragm p, as expressed by equation (1).
The output voltage of the amplifier is stored. Konoto! The IK controlled shutter speed TvIO is as follows: TVjx W BY −AVo+liV = (11)
It is.

When V” <AVP; in this case, the aperture p is increased to the minimum controllable aperture value AvM
[Also comparator CP.

The output is 11 of %L'. The ninth, forgiveness I
After the longest ICIN time has elapsed, the first memory switch 8
WI turns OFF. And 11 storage capacitor CtK
OP amperm, O output voltage VAt' = It + α ((!I
V-AVI)+8V) is stored. The shutter speed 'fvAx controlled at this time is TVjx =lV-av*+sv +'*++++G
i).

(3) Display operation before shirt release operation: If the aperture 6II or shutter release apex value displayed on display 1 is D, the input voltage of terminals T, ~T4 is v.
Collectively referred to as r, Vr=E, +αD...
...(to)).

By the way, if the voltage at point P1 *a is vrrp, then there are...a. (2); According to equation (2), the p1 apex value is as follows. Therefore, the shutter speed actually controlled is 11TVP.
To match the apex value, use equation (2) and (30)
It is sufficient to make the expressions identically equal. Therefore, l l r −(BY+8V)←(1s(jls+R4(11+r”
,. , E, ).

In order to obtain 1+r α, the electric current K1. ．． Resistors 8- to R and Fi are set.

In the end, the equation o6) becomes equal to the equation. Therefore, the connection point Pg(D
The electric current fE is equal to the shutter release time TVF when AvO(AVP(AVM).

On the other hand, if the voltage at the connection point PK is ytrAm, ・vr
rxmlc1+cZ((BY-AVo)+8V-(AV
M-Avo) )...OB). However, Muvx
The preset aperture ps appears. Here, since equation (2) is a general equation when converting voltage and apex value, a
B) The formula is D==BV+8V-AV*a= TV, ut
−・−・・−07). That is, the apex value is when the aperture p is closed to the preset value p',
The shutter speed TVAMff which provides proper exposure corresponds to the preset aperture value vx. In this case, the preset aperture) ll is the minimum number of apertures other than 90 diameter] value ^Vpr
When em@t is set, the formula is D” B V + 8 V −AV preset−
It can be expressed as TVpr*m*t-(Jg).

The output voltage vrr*o of 17t and OP amplifier A is (1)
Since the excess p of the equation, in light of equation (2), D-BY+8
V-AVD=TVIO--.--(Mj).

That is, the shutter speed TVjOK that provides proper exposure corresponds to the lens open ep value AVOK. Next, mu vo<
AVP<AVM.

AVP (AvO and AVP) AVM 12) and Keno display operation will be described.

MuvOkumv? <When AVM; At this time, the output of comparator CP1 is %L# as described above. Also, AV
Since P<MuvM, from equation (9) TVF>BY
+8V-ivy''c#. Therefore, according to equations (8) and (2), pVrr?) Vrr11O From the relationship Kt4, the output of the comparator CP glue is %1.I.

In this case, either ll-1 or Qin's logical value Fi'H%'L' may be used.

Since the gate operates as shown in Table 1, only terminal X- is at %HI and 9th circuit 4 is terminal! 1 input voltage, that is, the voltage 'yrrp in equation (2), is transmitted to the Vp converter SK.

Since the AND gate G is outputting % LI, the driver 6 causes the display I11 to display the shutter speed TVP corresponding to the voltage VrrpK. If you keep it, figure IIXz (a
) by the number 250 as shown in ? Displays 1/250 seconds.

When MuVJ-<MuVO; At this time, comparator CP
The output of , has already become ['H'.

Also, since the relationship is AVP<AvO (muVl), the output of comparator CP1 is %LI as described above.Since the gate operates as shown in Table 2, only terminal X snow becomes %H〃. The circuit transmits the input voltage of the terminal T, that is, the voltage vfFjO of equation (1), to the A/D converter StC.

Table-2 % LI of driver @#1AND gate Go [
, the shutter time Tvi according to the voltage vrrio.

Display on tlI indicator 1.

A V P ) A V &; At this time, the output of the comparator CP1 is L'. Also, k
VP)kVM, so from equation (9), TFP<BY
+JIV-AV&=TViit; h7a. Therefore, it is the output Fi' II ' of the comparator CP.

At this time, since the gate operates as II-3, the circuit 4 in which only the terminal XI becomes %HI transmits the input voltage of the terminal T to the vrrix f'y'D converter S.

*-S Therefore, drinking water-1 is displayed at 9 shutter seconds 'l'VjMt- due to the input voltage vTrAM.

[2] Shutter priority exposure control mode: At this time, the first to third mode selection switches SW・~'8
W- selects terminal S.

(1) Shirt release operation f11F movement: OP
The amperage voltage is applied to the inverting input terminal of the comparator CP. At this time, it is assumed that the preset aperture setting is set to the aperture p value AVJII. Comparator CP.

(i.e., the voltage applied to the non-inverting input terminal of the variable resistor V
Rs terminal voltage) VrrH is yrrx = El + αT
VM ・−・−−−−・−(20). However, TVM is manually set to 9 shutter seconds.

Exposure control operation; Now, when the shutter release is operated and f) of the aperture p1 starts, the OP amplifier A.

The output voltage V varies as shown in equation (5)7. Therefore, when vrrxx VAI is reached, the comparator CPI outputs %Hl to prevent narrowing down as described above. The aperture p value AVj at this time is AVxxBV+8V-TVI ``''@). After that, the first memory switch 8WI is turned off, and the capacitor C1
is the output voltage of the OP amplifier at that time 1 cm + α ((B
Y−*vj)+sv) is stored. Therefore, the actually controlled shutter speed TVj is tevj=Ilv-ivJ+svWTVy.

In reality, the lens O tolerance p value is, as mentioned earlier, because there is a #c@ field, the above control operation is an IO operation when Avj<^vo. , AVy
(I will explain the operation at AVz.

AVj and AvO's own; Since the output of Combare 9 CP t is already #C%H1 before the release operation,
diaphragm] is held at the p-value mm vo. Therefore, the voltage shown in (1) 2 is stored in the first storage capacitor C1,
The shutter speed to be controlled at that time is expressed by the following equation. 11jl controlled shack seconds is TeV
Changes from M to TvJOK.

After completion of the narrowing down of the memory capacitor cm, all memory capacitor cm is the output voltage of the OP amplifier ■, that is, El + C1((,BY +AV&)+8V) O
The voltage is memorized. Therefore, the controlled shutter speed fv1M is To as per the formula Q2). Here too, the shutter speed has been changed to VMFiTViw.

(3) Display operation before shirt release operation: AY)
(AVj (when AVj; comparator "$a'L'
It is. 11th, AVI (AVIO and 11th TV &>
BY+8V-AVj becomes 6 or b, (to), @) formula, jl Vrrw :) Vrrtx, and therefore, the output of the comparator CP is %LI. The gate is l!
-4, so only terminal
Transfer to D conversion-5. Here, the logical value of the voltage Vnors in Table 411 may be 'H or Lβ.

virse4,1+α(BV+8V-TVM)=EI10αAVj...[Exist]. The resistance value of tex resistance resistance -B is equal,
Since the relationship is 9l·R,=IC, the OP amplifier outputs the voltage girt of equation (2). Therefore, (13) and (2) equations〉voltage virx
corresponds to the aperture value vj. Driver I
Since FiAN D'7'-G* outputs tBl, the aperture value v1 is shown on the display TK*.

For example, the tolerance value controlled by the KIF5.6 symbol is displayed as shown in the attribute (m).

When M VJ < M vo; Comparator CP.

The output is already 'H' before the release operation.

t7'h, muyz(muvO<muvx, so the comparator cpIl is %L' as before. The gate is as shown in Table-6.
Because it operates like a terminal! , becomes %H1, and the ninth circuit 4 converts the input voltage of the terminal T, that is, the voltage of equation (1), into an A/D
The signal is transmitted to the converter 5.

! I-5 The output of the driver @FiAND gate G is rounded to %L1 and is expressed by the following formula: 'Shutter time TVj.

Display.

AVj (when JvJ; at this time, comparator c
The output of p, is % LI, and the output of the comparator CP is AVj<AVj % VrrM (from the relationship of Vrr1M, it is % HI. Since the gate operates as l!-6, the terminal X, is % HI and Natsu 9 circuit 4 are terminal T,
The input voltage, ie, the voltage vrriw of equation (16), is transmitted to the A filter converter 5.

Therefore, the display 117 shows the shutter time TVAmtfi in accordance with the voltage yrrix.

[3] Aperture priority exposure control mode: Ill~3 mode selection switch SW6~8W.

selects the terminal. At this time, the comparator, c
The non-inverting input terminal of p and p is grounded and always outputs L'. Therefore, the narrowing is not prevented.

Now, change the preset aperture pH of the lens to any aperture p value Vp.
When setting r@s@t and performing a release operation, the aperture is first set to p.
is narrowed down by Vpr, Hatake, and tl. After that, the first memory switch 8Wl is turned off, and the output voltage of the OP amplifier ■ at that time VVrPr*m*twm is stored in the capacitor C.
E, ten α ((BV+8V) AVpr*met) are stored.

Therefore, the shutter speed is controlled to a value expressed by the formula TVpr@m@tFi.

The display of this book is as follows.

The output of comparator CP1 is fixed at %L'. , AND gate G1, the output of G@ is the comparator CP
, CP, %L QC is fixed regardless of the output. The output of AND gate G is also fixed at %LIK. Therefore, only the output of OR gate G is %HI. Since the terminal X and the 'H'D circuit 4 transmit the signal to the terminal 〒10 input terminal vTrpr.set t to the A/D converter S, the display device T displays the shutter speed 7Vpres.t.

[4] Manual shutter time mode: Ill to 3 mode selection switches 8W to BW select terminal M.

At this time, the output of the comparator CP is fixed at %L'. According to °C, the aperture is the preset aperture value and Vpr axis.
It is narrowed down by tf and controlled by the shutter speed FiTVI.

At this time, the gate operates in the same way as in the @9 priority exposure control mode, so the voltage V input to the terminal Tr of the circuit 4
The shirt time TVM corresponding to rFx is displayed.

When the display 1 displays the shutter speed in each of the exposure control modes described above, it also displays whether the shutter speed is within the control limit. That is, when the output of the shutter speed from the A/D converter 5 exceeds @, the driver 6 outputs l/2000 as shown in FIG. 1 (O).
The second is the control upper limit, and the 61 mark 7a indicates that the shutter speed exceeds rt. When the time exceeds 119 under control, KL displays that 8 seconds is below mm and the p shutter seconds are n and n by p mark 1b, as shown in FIG. 12(d).

FIG. 3 is another implementation of the display of FIG. Components having the same connections and the same operations as in FIG. 1 are given the same reference numerals.

The connection of the input line of OR gate GI is different from a), OR gate G, (2) Output [1111
1 has been done. This is because in Fig. 1, the terminals A and y of the third mode selection switch 8W are commonly connected to KIIIm, but in Fig. 7, the switch 8w-' is not connected in common because it displays the mode. . A drive circuit I for dot display drives a dot display 12 in a predetermined state based on the output of the A/1) converter 5. Dot display 1
It is composed of a known type of 2ti LED, liquid crystal, electrochromic type, and has a plurality of regular arrays of dot displays.

Then, in response to the input voltage of one of the nine input terminals 1 to T4 selected by the signal selection circuit 4 described above, the dot display section at a good position lights up.

When the output of the gate G is %HI, the scale display drive circuit drives the scale display 11 for displaying the pattern II to display the scale of the p value. Vessel 13 has been erased and its scale does not appear. Gate G
When the output is % LI, on the other hand, the scale display 11 for displaying the an value is erased, and the shutter time display 13 is driven to display its scale. The blinking circuit 10 has a gate G,
The output is 'H'o waiting 47! ! Periodic % HI of degrees
, % 1. An alternating signal of I is output, and the aperture and priority mode display 16 are blinked via the gate G11. The output of gate Gl is %1. At the time of I, the output of the blinking circuit 10 is also fixed to the %L' base. 14.15.16.11tliLE
D, LCD, electrochromic, and other known mode indicators, Togb014 is for program mode, 1S is for shutter priority mode, 16 is for aperture priority mode, and 11 is for manual mode, respectively, mode selection switch a
It operates according to the mode selected in 19 w and ', and characters and symbols representing each mode are displayed.

These displays are generally in the camera's viewfinder! I can get it out. $1411 shows the implementation PIt of the arrangement state. The dot display section 10 is a dot indicator 12, and ill is a field frame of the part to be photographed. Figure 4 is a cabinet to show the placement status of the helmet, and as will be explained later, it does not display all of the excess pK. The display latch switch SW @ in Fig. 111 is omitted in Fig. 7, but when the camera is released when shooting, the display is latched as in Fig. 1 until the exposure is completed. .

Display control is performed as follows.

l) AVo (AV?) in program exposure control mode.
(At the time of AVy; at this time, as described above, the output of gate G is %H1 and 6), and the output of gate G@110 is % LI.

Therefore, the above-mentioned TVP is selected by the selection selection circuit 4, and dots at good positions are displayed in accordance with the apex value. Since the output of the gate G- is %Ll, the shutter speed indicator 13 is activated, and the shutter speed value centered at the position of the dot display can be read. At this time, the program mode display 14 is activated to indicate that the exposure control mode is programmed. On the other hand, since the output of gate G is fixed at %LI, the output of gate G4\・ is 'H'%in/<-91NV1 m force is %L
The output of the 11th gate G Hatake is % LI. Therefore,
The output of the blinking circuit 10 is 1Ll, and the mode indicator 16 is in the erased state.

2) In 10g exposure control mode [AV? (A
VOS or Ayy (at aVpo; at this time, gate G4 (
D output is %L11 Inverter I output is %H'
, the game f-G-O output Fi'H' trap, so the blinking circuit 10 generates alternating signals of % HI and % LI.

Therefore, the program mode display 14, in which the aperture p priority mode display 16 blinks, is operating at t11. The output of the gate G is fixed at %L1, and the scale display is the shutter time. In this way, the signal selection circuit 4 selects the 7'% rj) or TVAM signal as described above, and displays dots at the corresponding positions. In the state of AVP<AVo, Avy<avp, the program mode indicator 14 lights up in a direct current manner.
This is identified by the flashing display on the aperture p priority mode indicator 16. The display state at that time is shown in the ms diagram.

3) AvO<A in shutter priority exposure control mode #C
When Vj<AVf O; At this time, the output of the gate GI is %H11 and the output of the gate G@ is %HI.

Therefore, the aforementioned AVJ is selected by the signal selection circuit 4, and dots are displayed at nine positions in accordance with the aperture value. At this time, since the game) O@0 output is %H1, the scale display -11 of the aperture value display is driven, and the aperture value corresponding to the position of the dot display is read. At this time, the shutter priority mode indicator 1s indicates that the shutter priority exposure control mode is in effect. On the other hand, the output of gate G is fixed at %L I, and the output of gate G is fixed at %H11 inverter I.
N.V.

Since the output of the gate G is %L, and the output of the gate G is L', the output of the blinking circuit 10 is %L.

Accordingly, the mode indicator 16 is in the blank state.

The display state at that time is shown in FIG.

4) In shutter priority exposure control mode, AVj<A
When Vo1 father is MuvM<AvS; at this time Gate GII
The output of 11 inverter INV is % L The output of 11 inverter INV is %
The output of H11 gate G becomes %HI.9th, the blinking circuit 10 displays the aperture priority mode S through gate GIIt-.
! ! Flashing 16. The shutter priority mode indicator 14 is 111 activated. On the other hand, the output of gate G6 is %
Since it changes to LI, the scale display switches to display of aperture and value. 'I'yAo according to the selected output of the signal selection circuit 4
, or TVAM is selected and a dot is displayed at the corresponding position. AVJ(AVo, AVf(AV
This is identified by the SO status ahk priority mode indicator 15 lighting up in a direct current manner and the aperture p priority mode indicator 1 blinking. The display state at that time is shown in Figure J17.

5) In the priority exposure control mode or manual shutter speed mode; At this time, the outputs of the gates G@ and Ge are fixed at %L1, and the blinking circuit 1o does not operate. - 10,000, since the output of the gate as is also fixed at %LIK@, the scale is displayed in seconds. Also, the signal selection circuit 4
The Tv node is selected and a dot is displayed at the corresponding position. The shutter priority mode display 16 and the manual mode display sstya each display a display according to the selected mode.

As described above, according to the present invention, the above-mentioned drawbacks are solved and the camera user can make an appropriate decision when taking a picture, so there is less chance of losing a chance to take a picture.It becomes a convenient book.

[Brief explanation of drawings]

The first panel is a circuit diagram showing an embodiment of the present invention. No. 211(a) to (4 is a sign showing the display -. sis is a diagram showing the opening of the embodiment of the present invention. No. 4 Ill no Rin No. 711 is a sign showing the display in the finder. Explanation of the main - minute code] Circuit that generates the 111 code...VR aperture control am
・・・・・・・・・・・・・・・ CP ...14 lines 2 display means...
・・・・・・・・・・・・15Means for detection・・・・
・・・・・・・・・・・・CP. IIs display means・・・・・・・・・・・・GW,
G4 Fig. 2 (α) [1 Luck Fig. 4 Fig. 5 / Fig. 1-6 Ogo Fig.

Claims (1)

[Claims] A circuit that generates a signal according to the first signal and the shutter speed determined by a manual setting operation;
an automatic aperture control device having an aperture 1711 control that determines the aperture speed; and a shutter control device that controls the shutter speed in accordance with information about the 9IR determined by the aperture control device and information about the key record subject station; G on exposure control camera
and an illumination means for displaying that the program mode E mode is selected when the all signal corresponds to the subject brightness; a shutter priority mode is selected when the signal corresponds to the shutter speed determined by manual setting operation; A stripe indicating that it is in the kite mode; II as determined above! jJmouth l11 tone11Il! ! means for detecting whether l! exceeds a limit value; and means for detecting whether the determined l! j) The camera is characterized by comprising a third display means for displaying, when the aperture exceeds the limit value, that the camera time is controlled in accordance with the limit value and the subject brightness. camera display device.