JPS62161022A - Photometric apparatus - Google Patents

Abstract

PURPOSE:To make it possible to simply determine a state capable of obtaining proper exposure with good accuracy even when a shutter speed and a lens opening value were determined, by measuring light the containing a flash light component in a state separated into the quantity of steady light and that of flash light. CONSTITUTION:Photometric means C1, C2 measure light containing a flash light component in a state separated into the quantity of steady light and flash light. Shutter speed setting means SW3, SW4, SW13 set shutter speeds and a lens opening value setting means SW3, SW4, SW13 set lens opening values. Quantity of exposure for obtaining proper exposure is calculated from the each set shutter speed and each set lens opening value by an exposure quantity calculation means CPU. The quantity of deviation of the calculated quantity of exposure with the photometric quantity means by each of the photometric means C1, C2 is calculated by a deviation calculating means CPU. Then the ratio of the calculated quantity of exposure and the quantity of flash light measured by the means C1, C2 is calculated by a ratio calculating means CPU to be displayed on a display means LCD. By this method, the excess and deficiency of the quantity of flash light to proper exposure is displayed in terms of a ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photometric device, and more particularly, to a photometric device that can separately measure the amount of light and the amount of steady light.

E & he W anal conventional, flash ¥ cr! When performing flash photography using No. 1, the shutter speed is determined by the synchro synchronization speed of the camera, and the aperture value may also be determined by the desired depth of field. In such cases, in order to obtain proper exposure, Jubei should either adjust the amount of light emitted by the flash device or adjust the distance between the subject and the 7 lash vc position, while also adjusting the determined synchronization speed. It is necessary to increase the aperture value to find a point where proper exposure can be obtained, and it has the disadvantage that it takes time and effort to find a state where proper exposure can be obtained.

Therefore, the purpose of the present invention is to develop a photometry method that can easily find the conditions for obtaining appropriate exposure with high accuracy even when the shutter speed and aperture value are determined in this way.
Our goal is to provide the following.

In order to achieve the above object, the photometric device of the present invention includes a photometric means that separates and measures light containing a flash component into a steady light amount and a 7-lash light amount, and sets a shutter speed. a shutter speed setting P step to set the aperture value, an aperture value setting means to set the aperture value, an exposure m calculation means to calculate the exposure amount to obtain the appropriate exposure from the set shutter speed and aperture value, and the calculated exposure amount. deviation calculation means for calculating the deviation amount between the calculated amount of deviation and the photometric amount measured by the photometry means; The present invention is characterized by comprising display means for displaying the ratio.

According to the above configuration, the excess or deficiency of the amount of flash light relative to the proper exposure is displayed by the display means as a ratio.

(The following is a blank space) Fire 1 I Figure 1 is a block diagram showing the configuration of the present invention. The photoelectric conversion circuit (C1) is composed of a light receiving element, an operational amplifier, and a logarithmic compression diode, and converts an electric signal proportional to the logarithm of the intensity of light incident on the light receiving element into the next stage integrating circuit (C2). ) and the optical trigger detection circuit (C4). The likelihood circuit (C4) provides an integration start signal to the integration circuit (C2) when light with pulsed light emission enters the light receiving element of the photoelectric conversion circuit (C1), and Microcomputer (CPU)
), a signal indicating that the light having the pulsed light emission is incident is transmitted to the input terminal (INTA) of the device. The transmission of the integration start signal from the light trigger detection circuit (C4) to the integration circuit (C2) is performed when the setting mode of the exposure meter in this embodiment is the non-code mode (a flash light emitting device without using a code). This mode is valid only in the mode in which integration is started in response to light from the CPU), and is prohibited in other setting modes by a signal from the output terminal (PO9) of the microcomputer (CPU).

The above-mentioned integrating circuit (C2) has a detection circuit (
C4), or the above micro combinator (CPU
), the electric signal corresponding to the incident light from the charging conversion circuit (C1) is integrated for an externally set date time or a preset time. , connect the above output terminal (PO
The addition of / to the line connecting I) and the integrating circuit (C2) indicates that there is a plurality of connection lines. Hereinafter, lines with / appended to them indicate multiple lines. The electrical signal integrated by the integrating circuit (C2) is sent to the microcomputer (CPU).
The signal from the output terminal (PO2) of the AD
In the conversion circuit (C3), the analog-to-digital conversion is performed, and the AD-converted digital signal is transmitted to the input terminal (r'll) of the microcombiner (CPU), together with an AD conversion completion signal.

The AD conversion circuit (C3) can be implemented using various methods such as a 211 integral method or a successive approximation method, but since the details are not directly related to the present invention, it is possible to use a microcomputer (CPU).
) input terminal (P I 1 ) and output terminal (PO2),
and AD conversion circuit (C3), it is assumed that various AD conversions can be performed, and a detailed explanation will be omitted. The micro combinator (CPU) consists of a ROM that stores programs in advance, a RAM that temporarily stores data, an accumulator that performs various calculations,
It includes a timer that generates a signal at regular intervals, various decoders, output terminals, and input terminals.

The input terminal (RE) of the above microcomputer (CPU)
SET), a reset signal is input from the reset signal generator (G E 3 ) when the ffl source is turned on, and the microcomputer (CPU) reads the program from a predetermined address of the program stored in the ROM. Start execution. The reference pulse generator (G E 1 ) is connected to the input terminal (P
The microcomputer (CPU) inputs an oscillation pulse to the reference pulse oscillator (GE1).
The program progresses according to the oscillation pulses from the reference pulse oscillator (G E 1 ), and the oscillation pulses from the reference pulse oscillator (G E 1 ) are counted by the internal timer 〇, so that an internal interrupt is generated at approximately fixed intervals. It has become. On this timer! The m-inclusion is common in microcomputers currently on the market, so a detailed explanation thereof will be omitted.

The output terminal (P O8) of the microcomputer (c p u ) outputs a HiHb signal at the same time as the start of measurement when the setting mode of the exposure meter in this embodiment is hood type measurement, and outputs a HiHb signal for sink a, I? ? Operate the driver (DVI) and short-circuit the synchro terminal (T1). Further, the output terminal (PO3) is connected to a display driver (D V 2 ). The display driver (DV2) drives the display element (LCD), and includes a one-blink oscillator (G E 2) supplies a blinking pulse to the display driver (DV2), and causes the segment in the display element (LCD) to be blinked in accordance with the blinking pulse.

Output terminal of the above microcomputer (CPU) (
PO4) runs the lighting driver (D) according to the program.
V 3 ) and the lighting driver (D
V3) causes the display lighting member (LEDI) placed on the back surface of the transflective type display element (LCD) to be turned on by the High signal from the output terminal (PO4). The ISO setting section (SWI) allows you to set the film sensitivity according to ISO standards using an external dial.The film sensitivity value, that is, the ISO value, set in the ISO setting section (SWI) is determined by a code corresponding to the ISO value. The above micro combinator (CPU
) is input from the input terminal (PI5).

Key matrix 1 (KM 1 ) is used to know the status of the normally open switches from (SW2) to (SWII), and the output terminal (pos) of the microcomputer (CPU) is connected to the recall key. Switches (SW2) and (SW3) other than the normally open switch (hereinafter referred to as the recall key) (SW6).

(SW4), (SW5), (SW7), (SW8), (
SW9).

It outputs a signal to strobe (SW 10 ) and (SW 11 ), and the output terminal (po6) outputs a signal to strobe the recall 4-(SW6). The input terminal (PI3) is the key matrix (KMI)
This is a terminal into which signals indicating the states of switches (SW2) to (SWII) are input, and the output terminal (P
The strobe signal output from O5) and (POG) is a Higl+ signal, which strobes each switch in time series according to the program, and when the strobed switch is ON, the above input terminal (PI3)
A HiBl+ signal is input to.

The signal input to the input terminal (PI3) is connected to the input terminal of the off-date (ORI), and the output of the off-date (ORI) is connected to the microcomputer (ORI).
It is connected to the input terminal (INTB) of the CPU. When the microcomputer (CPU) program is in the HALT state, if the output terminals (PO5) and (po6) are outputting a High signal, turn on one of the switches (SW2) to (SWll). As a result, the Higl+ signal is input to the input terminal (INTB), and the input terminal (INTB) is inputted to the input terminal (INTB).
In response to the interrupt signal input to B), the microcomputer (Cr'U) jumps from the HALT state to a predetermined program address and resumes execution of the program. (SW2) is a normally open switch (hereinafter referred to as the measurement button) connected to the measurement button, and by turning it on, it starts a series of measurements according to the setting mode, or the measurement circuit (CI), (C2) , (C3)t(C4
) can be measured I! ! (For non-code measurement, perform the operation of holding in the 7-lash light standby state!)

(SW3) is the normally open switch (
Hereinafter, it is referred to as an up key), and is used to increase the TIME (shutter speed) or FN value (aperture value) set in the data select switch (SWI3). (SW4) is a normally open switch (hereinafter referred to as the down key) that follows the down key, and is a normally open switch that follows the down key.
This reduces the value of No. (SW5) is
This is a normally open switch (hereinafter referred to as the memory key) connected to the memory key, and when turned on, the measured value data is stored in a predetermined RAM in the microcomputer (CPU). to remember.

(SW6) is a recall key, and the display element (L
CD ) is off, the display element (L
CD) lights up the display contents before the lights went out.

Also, while the display element (LCD) is lit and the recall key (SW6) is turned on, the data stored by the memory key (SW5) is displayed on the display element (LCD). Let's do it.

(SW7) is a normally open switch (hereinafter referred to as memory clear key) connected to the memory clear key.
By pressing N, the data stored by the memory key (SWS) is erased. (SW8) is the normally open switch (hereinafter referred to as , H key), and (
SW9) is a normally open switch (hereinafter referred to as S key) connected to the S key (calculation key for shadow reference exposure), and (SWIO) is the FIX key (calculation key for fixing measured values).
a normally open switch connected to (hereinafter referred to as the FIX key)
It is.

When you turn on the [■] key (SW8), the S key (SW9), and the FIX key (SWIO), the exposure calculations that have been programmed in advance for those switches are performed, and the results are displayed on the display element ( LCD)
to be displayed. (SWII) is MULTI
A normally open switch connected to the RESSET key (hereinafter referred to as M
This key is called the ULTI RESET key) and is used to start a new measurement when performing integrated measurement.

The key matrix (KM2) is (SWI2).

This is a key matrix circuit for knowing the status of each static switch (SWI 3) and (SWI 4).
07) outputs a strobe signal in time series and switches (SW 12 ), (SW 13 ), (SW 1
4), the key matrix (KM2) connects the switches (SW 12 ), (SW 1 ) to the input terminal (PI4) of the microcomputer (CPU).
3).

(SWI4) signal is transmitted.

(SWI2) is a switch (hereinafter referred to as setting mode switch) that is selectively set to one of the three positions: AMB I, C0RD, NON, and C. When AMB I is selected, The exposure meter of the present invention measures ambient light, and when C0RD is selected, it outputs a signal to the synchro driver (DVI) to cause the 7 lasier device connected to the cord to emit light, and also to emit flash light. If measurement is performed and NON or C is selected, it is programmed to generate a flash light and start cordless 7 Lassie light measurement.

(SWI3) is a switch that is selectively set to one of two positions, TIME and FN (hereinafter referred to as TIME
/FNO switch), and when TIME is selected, the measurement result is a shutter speed priority measurement in which the FN value is calculated and displayed as the answer, and the above up key (SW3) or down A- (SW4 ) can change the set value of the shank speed displayed on the display element (LCD). Also, the marks around the TIME mark in the display element (LCD) are lit 4':FN. ”Dual T I ME
/FN, when the switch is selected to FN, the F displayed on the display element (LCD) can be changed by operating the up key (SW3) or the gran key (SW4).
The set value of No value can be changed. Further, by executing the measurement, a so-called aperture priority measurement is performed in which the answer to satisfy the set FN and value is calculated and displayed. At this time, the display element (LCD)
FN in the middle, around the mark (R): The mark (B) lights up.

(SWI4) is ST NGLE, MULT I 2
A switch that is selectively set to one of the positions (hereinafter referred to as
(referred to as the SI NGLE/MULT I switch), when SI N0LE is selected, a single measurement is performed, and when MULT I is selected, an integrated measurement or integrated number calculation is performed. Take measurements.

FIG. 2 is a diagram showing the appearance of the light meter of the present invention. The light receiving window (MA) is provided at the top of the main body.

In Figure 2, the S INGLE/MULTI switch (SWI4) and the MUL” [”l RESET key (
The positional relationship of SWII) is as shown in the side view of FIG. When turning on the MULTI RESET key (SWII), follow S1. above. This is only when the NGLE/MULTI switch (SWI4) is selected to the MULTI position, and in the exposure J1 of the present invention, the above S I
NGLE/MULT I switch (SWI4) and MUL
The TI RESET key (SWII) is configured with one switch. In other words, S I NGLE/MULT
M on the outside of the MULT r side of the I switch (SWI4)
ULT IRESET box is provided and 7 (9
, by further pressing the switch from the MULT 1 position, the MULTI RESET key turns ON, and the following operation is executed. Further, the switch that has been pressed down to the MULTIRESET position is configured to naturally return to the MULTI position due to the restoring force of the spring material when the finger is released.

FIG. 3 shows a display element (LCD) of a light meter showing the present invention.
) is a diagram showing a state in which all segments of the screen are lit. FIG. 4 is a block diagram showing a display driver (DV 3 ) for driving the display element (LCD) and display-related parts of the microcomputer (c p u ).

The display driver (DV3) is shown as a static type that outputs an output corresponding to each segment of the display element (LCD) individually, but it is of a dynamic type that is driven by a common signal. It's okay.

The microcomputer (c p u ) is provided with RAMs (RAMI) to (RAMIG) for transmitting display data to the display driver (DV3). (RAM12) stores data for outputting lighting No. 13 to address (A1) for lighting up the ISO mark (to) of the display driver (DV3). (RAM13) is a RAM that outputs a lighting or blinking signal to the address (A2) corresponding to the TIME mark ()1) of the display driver (DV3). (RAM14) is a RAM for outputting a lighting or blinking signal to the address (A3) corresponding to FN and mark (LE) of the display driver (DV3). (RAMI) stores the SVo corresponding to the Is○ value set by the ISO setting unit (SWI), is connected to the ISO decoder (DCI), and is connected to the ISO decoder (DCI).
The SO decoder (DCI) decodes the data in RAM1 into a code that can be lit on the display element (LCD), and outputs it to the IS of the display driver (DV3).
Store in O display address (A4). The above ISO display address (A4) is connected to the ISO display of the above display element (LCD), and the SV stored in the above (RAMI)
o Display the value corresponding to the data.

(RAM2) stores the TV value corresponding to the shank speed set by the up key (SW3) or the gran key (SW4) or the shatter speed derived by arithmetic processing, and the TIME decoder ( D
C2) and the above TIME decoder (D C2)
transfers the data of the above (RAM2) to the display element (L C
Decode it into a code that can be turned on with D) and enter the TIME display address (A5) of the display driver (DV3) above.
). T I of the above display driver (DV3)
ME display address (A5) is the display element (LCD)
) is connected to the TIME display (d) of the above (RA
Display the lower price corresponding to the TV and data stored in M2).

"S" of TIME display (d) in the display element (LCD) above
” indicates seconds, and the TIME decoder (D C2
), and similarly the TIME display (d) “-”
indicates the minute, and the TIME decoder (D C2) above is set so that it lights up when the shutter speed is from 1 minute to 59 minutes.
decoded with

(RAM3) stores the FN and value set by the up key (SW3) or the grand key (SW4) or the FN derived by arithmetic processing, the AV corresponding to the value, and the value, and the FNo value decoder (D C3'), and the above FN and value decoding (DC3) are connected to the above (R
AM3) data is decoded into a code that can be lit by the display element (LCD), and the data is sent to the display driver (D
V3) FN, t1 display address (A6).

The FN of the display driver (DV3), the display address (A6) is the FN of the display element (LCD).
It is connected to the display and displays values corresponding to the AV and data stored in the above (RAM 3). (RAM4)
is the SI NGLE/MULT I switch (SW1
4) is selected as MULTIII, the MULT I value indicating the cumulative number of measurements or the number of multiple exposures derived by arithmetic processing is stored.
GV, MULT I NO decoder (D
The GV, MULIT No decoder (D C4) decodes the data in the RAM 4 into a code that can be lit by the display element (LCD), and outputs the GV of the display driver (DV3). ,MUL
Store in T INo display address.

GV of the above display driver (DV3).

The MULT I NO display address (A7) is connected to the display element (LCD) (F) GV, MULT I N (ji), and the MU stored in the above (RAM4).
Display the value corresponding to the LT I NO data.

In addition, a part of the MULT I NO data in the above (RAM4) is stored in the MULT I of the display element (LCD),
The above display driver (D) connected to the mark (S)
V3)'s MULTI v-47)'X(A8)l:
MULTI of the above display driver (DV3)
Make the mark (su) light up or flash.

As the MULT rNo data of the above (RAM4), O
If data other than FF is stored, the terminal (T2)
It outputs a LOW signal, controls the address (ANDI), and cuts the output from the GV and data storage (RAMP).

Above S INGLE/MULTI switch (SW14)
When 5INGLE is selected, MULTINo
The data becomes OFF, and from the above (1'? AM4) to the above or day)? o All data input to R3> is L
It becomes an OW signal, and on the other hand, the above terminal (T2) liHIGH
Output the signal to the above GV.

The MLILT INo decoder (DC4) has the above (
The data from RAM5) is 7nd date (ANDI)
, is input via off-date (OR3). At this time, MULT I of the above display driver (1) V3),
The display element (L C
D)'s MULTr'7 mark (su) extinguishing signal is input.

The above GV is input to the MULT INO decoder (DC4) and is stored in the above (RAM5).

The data is sent to the GV, MULTTNO decoder (DC
In 4), the display element (LCD) is decoded and
The GV and MULT IN0a lights corresponding to the GV and data stored in the above (RAMP). At the same time, a lighting or blinking AJ is supplied to the GV mark address of the display driver (DV3), and a lighting signal of 10 mark or 1 mark (G) is supplied to the 10-mark address (AIO).

The above (RAMI), (RAM2), (RAM3).

When the data oFFII is stored in (RAM4) and (RAM5), an inverted signal is transmitted from each RAM to the corresponding defogoo, and each decoder transmits a light-off signal to the display address assigned to the decoder. It is.

(RAMP) is TIME/FN, switch (SW13
) is stored, and the setting information of the display element (L C
Display driver (D) that lights up the S mark (B)
DV3) is connected to the comark address. Above T
[ME/FN.

When the switch (SW13) selects TIME, the S mark (b) around the TIME mark (c) on the display element (LCD) lights up, and when FN is selected, the S mark (b) lights up. , FN, the = mark (b) around the mark (l) lights up.

(RAM7) is the I] key (SW8), the S key (SW9)
), ftt of the FIX key (SWIO), 0NLr,
=lk stores the data S I-I F to be determined, and if the value of the SHF data in (RAMP) is other than 0, it is decoded by the SHF decoder (DC5) and the display driver ( DV3)
It is stored in the SHF mark address (A12) connected to the SIIF mark of the dual display element (LCD).
), S mark (u), ■] mark (ne), F mark (
(iii) Turn on one of the above α lamps according to the SHF data.

(RAM8) contains 7 of the OUF and UDF generated when the calculated data exceeds the display range of the exposure meter of the present invention.
0Ve of the display element (LCD)
r? -ri(tsu), to the overunderv-ku address (A13) connected to the underv-ri(n),
Gives a blinking signal for the over mark (Tsu) or a blinking signal for the old +der mark (S). (RAM9) stores the state of the setting mode switch (SW12), and when the above (SW12) selects AMBI, the AMI3 I mark (9) on the display element (LCD) lights up. Display the signal above Defu-Goo (DV 3)
AMBI, C0RD, NON, C? -ri7 dress (A
14) and when C0RD is selected, C0
A signal is supplied to (A14) to turn on the RD mark (force). Also, when NON, C is selected, N
A signal is supplied to (A14) to turn on or blink the ON and C mark (wa).

(RAM1G) stores a signal for blinking the memory mark 1 or memory mark 22 of the display element (LCD'), and (RAMI O) stores -MN indicating the number of memorized measurement values. ing.

The above (RAMIO) MN data is MN Defu-Goo (D
C6), when MN is O, memory marks 21 and 2 are turned off, when MN is 1, memory mark 21 is lit, and when MN is 2, memory marks 1 and 2 are lit. 21 of the display driver (DV 3) through the OR2 (OR2).
, 2, is supplied to address (A15). Above (RAMI
G) supplies the flashing information of memory mark 21 (shi) or memory mark 2 (evening) to memory mark 1゜2, address (A15) via OR date (OR2) by turning on the recall key (SWf3). do.

(RAM15) stores the lighting signal by executing the display program routine of the program, and the analog index address (A16) of the display decoder (DV3) is stored in the display element - (LCD) connected to the analog index address (A16).
') lights up the analog indicator.

(RAM11) is the above, S, H, F mark (U)
, (S), (N) are not lit, the deviation from the memorized value based on the last measured value is stored, and the 5I
When the II, F marks (U), (S), and (N) are lit, the deviation from the last measured value and the stored value based on the calculated exposure value is stored. The analog decoder (DC?) matches the stored data of the above (RAMII) with the value based on the reference with the dot above 0 of the analog index of the above display element (LCD).
It is decoded and transmitted to the analog dot address (A17) of the display driver (DV3). The above analog decoder (DC7), analog dot address (A1)
7), Analog code/1 in the display element (LCD)
- are not directly related to the present invention, so details will be omitted.

Furthermore, when a blinking signal is input to each address (Al to A17) of the display driver (DV3), a signal to blink the corresponding segment is sent to the display element according to the oscillation pulse of the blinking oscillator (GE2). (LCD
) is supplied to the above display driver (DV3).
has. The explanation here is that each of the seven addresses of the microcomputer (CPU) and the display driver (DV3) are connected in parallel, but the microcomputer (CPU) and the seven addresses of the display driver (DV3) are connected in parallel. ), it is also conceivable to transfer data to each address of the display driver (DV3). or,
The display here has been explained as being performed by a decoder etc. configured in the micro combinator (CPU), but there is also a method for decoding using a program stored in the 70M. It is possible.

Next, the fjl setting of the exposure meter in this embodiment will be explained according to a flowchart.

When power is applied to each circuit in the block diagram shown in Figure 1,
A reset signal is supplied from the reset generator (GE3) to the input terminal (RESET) of the microcomputer (CPU), and the microcomputer (CPU)
p u ) starts execution of the program from a predetermined ROM address. Figure 5 shows the above input terminal (RESET)
70-chart showing a program to be executed when a reset signal is input to the 70-chart. In step 1 (
The stack pointer in (CPU) is set to a predetermined value, and in step 2, each output terminal in (CPU) is set to an initial state. In step 3, read the ISO value set in the above ISO setting section (SWt) from the input terminal (PI5) with a code, and send the data to (RAMI).
Store in. In step 4, TV. A value corresponding to a predetermined initial shutter speed value is stored in a RAM that stores a value. Similarly, AV in step 5.

A value corresponding to a predetermined initial FN and value is stored in a RAM that stores a value. In step 6, M indicates the number of cumulative exposures or the number of multiple exposures obtained by calculation.
Set 0 to the RAM that stores ULT I NO, step 7
Then there's the GV, which instructs you to increase or decrease the amount of light from the flash. In step 8, 0 is stored in the RAM that stores the memorized MN indicating defeat, and in step 9, RN indicating the memory number called by the recall key (SW6) is stored. 1 is stored in each RAM.

In step 10, timer 1 and timer 2, which are used as counters to generate a certain period of time, are reset, and from then on, the measurement of a certain period of time is started. In step 11, the H key (SW8), S key, which performs the above exposure calculation,
The flag S[F, which is set by turning on either the key (SW9) or the FIX key (SWIO), is reset to O.

In step 12, when the value derived by the calculation after measurement is outside the display range, the 0 Ver mark (t) or the underv mark (j:f) is set to light up.
Set lags 0tJF and tJDF to 0. Step 13
Now, write TIME/FN to the above (RAM6).

Store the setting state of the switch (SWt3) and proceed to step 1.
4, set the setting mode switch (1'?AM9) above.
The setting state of SWt2) is stored. In step 15, the setting state of the S INGLE/MULTI switch (SWt4) is stored in the RAM 20.

In step 16, if the 5INGLE/MULTI switch (SWt4) is set to 5INOLE, the process jumps to step 17, and if MULTI is selected, in steps 1B and 19, the display element (LCD) GV, MULT I No display is MUL
(R
AM4) and (RAM5) are set. In step 17, T I ME/FN, switch (SWt3)
has selected FN, and the setting mode switch (SWt2) has selected C0RD, NON, or C, jump to step 22.23 and set the GV of the display element (LCD), (RAM4), (so that the GVo data is displayed on the MULTINO display.
RAM5) is set. Otherwise, step 20.
Jumping to 21, G of the display element (LCD)
V, MULT I No display is blank (
RAM4) and (RAM5) are set. Thereafter, the process proceeds to step 24, the display program, where the above (RA
MI).

(RAM 2 ), (RAM 3 ), (fl A
M6), (RAM7).

(RAM8), (RAM9), (RAMI G).

(RAMI O), (RAMI 5), (RAMI 1
).

(RAMI 2>, (RAMI 3), (RAMI 4)
) are input with the data to be stored respectively. As a result, the display element (LCD) displays a display according to each switch.

In step 25, the strobe signals from (SW2) to (SWII) are set to HiHb.

From now on, when any of the keys from (SW2) to (SWII) is turned on, a Hi signal is sent to the input terminal (INTI3)- of the microcomputer (CPU).
One signal will be input. In step 26, an interrupt operation is performed when a Higb signal is input to the input terminal (INTB), and the microcomputer (
The timer 〇 in the CPU) starts the reference pulse oscillation 5 (GE).
Counting the oscillation pulses from I), over 70-
Enable interrupt operations to be executed when In step 27, the operation of the micro combinator (CPU) is temporarily stopped.

This suspension is canceled when the two types of interrupts permitted in step 26 occur.

Figure 6-1, Figure 6-2, Figure 6-3, PtrJ6-4
Figure fjS6-5 is the microcomputer (c
This shows a program that is executed as an interrupt when the 111g1+ signal is input to the input terminal (INTB) of p u ). In step 30, the input terminal (INTA) of the microcomputer (CPU).

Interrupts that occur when the Hi-Bi 11 signal is input to (INTB) and interrupts that occur when the internal timer 〇 exceeds 70- are prohibited. In step 31, it is determined via key matrix 1 (KMI) whether the measurement button (SW2) has been turned on. The above measurement button (S
If W2) is OFF, jump to step A and turn it ON.
If it is L, execute step 32. In step 32, the setting mode switch (SW 12 ),
TI ME/FN, switch (SW 13), S
Since the calculated data differs depending on the combination of the states of each switch of the I NGL E/MULTI switch (SW14), the setting state of each switch is detected and the display on the display element (LCD) corresponding to the calculated data is displayed. (RAM2>, (RAM3) so that it is blank.

Blank data is stored in (RAM4) and (RAM5).

Table 1 shows the setting switch (SW12).

Tin:/FN, switch (SW13).

Calculated data, display driver (DV3) address, display element ([, C
It is a table showing the display contents of the calculation data of D).

Step 32: To explain with an example, the above S I N
GLE/MULT I switch (SW14)
NGLE, T I ME/FN, switch (SW13)
is TIME, setting mode switch (SW12) is C0f
If each is set to LD, the calculated data is A
By storing the data OF F II in (1'?AM3), the FN display in the display element (LCD) becomes blank.

In addition, the above S I NGLE/MULT I switch (
SW14) is S I NGLE, T I ME/FN,
When the switch (SW13) is set to FN, the setting mode switch (S
W12) are each set in C0RD, the calculated data is GVO, and the above (RAM4) is
The data F F H is stored, and the GV mark of the display element (LCD) lights up in (RAM5), and +-7
- Set the data that will become the 1/GV and MULT I NOR indicators h'l'7 links. As a result, the GV and MLILTTNO display (CH) of the dual display element (LCD)
, MULTI, Ima mark (su), and +- mark (g) go out, and only the GV mark (nu) lights up.

In addition, the S I NGLE/MOLT I switch (SW
14) is MULT I, T I ME/FN, switch (3w13) is TIME, setting mode switch (SW
12) are respectively set in AMBI, the calculated data are MULTINO and A V o. At this time, OF F H is stored in the above (RAM3), and the RAM (FLASHR) is
AM) stores O. The details of the measurement method will be omitted since it is not directly related to the present invention. In step 33 above, the setting mode switch (SW12) is set to C.
If 0RD is selected, jump 7 to step 35, set the output terminal (PO8) of the microcomputer (CPU) to Higb, drive the synchronization driver (DVI), and connect the synchronization terminal (T1). is short-circuited, and in step 36, flash light including stationary light is measured in accordance with the shutter speed already set from the outside. After completing this measurement, measure the ordinary light at a predetermined time and perform the above (A)
The measured values of the constant light are stored in the AMB RAM), and the measured values of the flash light including the constant light are stored in the
From the constant light measurement value stored in IRAM), the value of only 7 lashes of light is calculated by calculation, and the result is converted to (FL
ASHRAM). The above-mentioned method of measurement and method of calculating the value of only 7 lashes by calculation have already been discussed in detail in Japanese Patent Application Laid-Open No. 10569/1982, so a detailed explanation will be omitted here. If the setting mode switch is set to NON or C in step 33 above, the process jumps to step 37. In step 37, signals for blinking the NON and C marks (wa) are stored in the RAM 9 together with the setting data of the setting mode switch (SW12).

As a result, NON and C of the display element (LCD)
The mark (wa) starts blinking, indicating that the exposure meter of this embodiment is in a state where it is possible to measure the emission of flash light (hereinafter referred to as the light standby state).In step 58, the output terminal (
A Higl+ signal is output to POS ) and (P 06 ). In step 38, the timer 1 for measuring the time in the above-mentioned waiting state is reset and measurement of this time is started. In step 39, the input terminals (INTA) and (IN
Interrupt operations caused by input of a Higb signal to TB) and interrupt operations caused by overflow of internal timer 0 are permitted. In step 40, the time in the light standby state is measured. While repeating step 40, I (iH1) is connected to the input terminal (INTA).
When the + signal is input, that is, when the optical trigger detection circuit (C4) detects that the flash light is emitted, it jumps to step 36, and performs the series of measurement operations described when set to C0Rt). During the light standby state in step 40, from (SW2) to (SWII)
When any key is turned on, the input terminal (INT
A Higl+ signal is input to B), and the program jumps to step 30. In addition, if the internal timer 〇 overflows in step 40, when the internal timer 〇 overflows, the program jumps to the specified address and executes the program. and come back.

As a result, the optical standby state continues for a certain period of time (and the process proceeds to step 41, where the input terminals (INTA) and (INTB)
In step 42, the NON and C
A signal for turning on the mark is stored in the RAM 9. *In addition, if the data to be calculated is determined as T1 as explained in step 32, and the data is of rank 7, that is, if one measurement has not been performed, the above display corresponding to the data will be displayed. Data for displaying 0 in the element (LCD) is stored in the RAM corresponding to the data to be calculated. NON, C mark (
A) changes from flashing to lit, indicating that the light standby state has been released. can be understood. After step 42, the program jumps to step E. When the measurement according to the setting mode of the setting mode switch (SW12) is completed, the program advances to step 43, and the above TIME/FN.

The switch (SW13) selects TIME, and the switch (SW13) selects TIME.
NGLE/MULT 1 switch (SW14)ffMU
If LT 1 is selected, proceed to step 4t and perform the next calculation.

DATAl DATAl + 2 IllA
MBIRAM --(1) DATA1 = lo
gz 2 DATA1 - (2) Oath DAT^1 = DAT^1 □
(2)'DAT^2 DATA2 DFLAS
llftAM −, 3゜2 −2 +2 DATA2 = logz 2 DAT
A2 (4) En DATA
2=DATA2 −□
(4)' DATA I shown in formula (1) is
It is the integrated value of the measured value of the steady light, and DATA2 in equation (3)
indicates the integrated value of the measured value of flash light only.

Before performing integrated measurement, 0 is input to DATAI and DATA2, and in Gl-W of equations (1) and (3), if the exponent of 2 in the term of two powers is 0, then A special calculation is performed in which tq is determined and the term is regarded as O. Further, in equations (2) and (4), special calculations are performed such that when the term of the power of 2 on the right side of each equation is 0, the value on the left side becomes O. In the next step 54, the number of integrations MULTINo is incremented by one digit.

If you do not jump to step 44 above, D
ATA1=DAMBIRAM-(5)DATA
2= DFIASIIItAM −□−□ (6
). Formula (1) (3) (5) (6)
DAMB I RAM1. tAMB I Indicates the data stored in RAM, DFIASHRAM is F
LASIIIAMl,m indicates stored data.

The display data in the figure is WDATA1 and WDAT A
2, and the display data address is WDATA1.
and after completing one or more calculations indicating the RAM in which the data of WDATA2 is to be stored, step t6
Then, exposure calculation is performed, and the calculated data is displayed on the display element (LCD) in the next 47 steps. Between step 32 and step 47, the display corresponding to the data to be calculated becomes blank, and in step 48, the display shows what has been calculated and displayed through measurement.
12) determines whether NON or C is selected at tII, and if NON or C is selected, step 37
The measurement loop when the setting mode is NON or C is repeated, and the camera enters a light standby state.

If NON or C is not selected in step 48 above, after confirming that the measurement button (SW2) is OFF in step 4, wait until the entire display becomes blank in step 50. The timer 2 for measurement is reset, and a new measurement of the time until the above-mentioned entire display becomes blank is started. In step 51, the output terminal (P
O5).

Set (P2O) to HiHI+ and from the above (SW2) to (
When any of the input terminals (SWll) is turned on, the input terminal (
lIigb (No. 3) is input to rNTB). In step 52, interrupts due to a 1 error at the input terminal (INTB) and an overflow of the internal timer 〇 are enabled, and in step 53, the program is temporarily stopped. .

At step 31 in fi6-1 diagram, press the measurement button (SW2)
If it is determined that flI is not turned on, the 6-2
Jump to step 8 in the diagram and click Up 4-(SW
3) is ON or not, check the above key matrix 1 (
tq is determined by supplying strobe buoy J to KMl). IQQ when the above knob key (SW3) is ON
10 jumps step 611 and performs the above T I M
E/FN, switch (SW13) is TIME, FN,
It is determined which one is selected, and if TIME is selected, the process advances to step 64. Step 6
In step 4, the TVMAX value determined from the display range of the shutter speed of the exposure meter of this embodiment is compared with the value TVo corresponding to the set shutter speed, and if they are equal, no operation is performed and step 721 Konoyamp. At step 64, the value of TV and T V M A
If the values are not equal, then the TV value is always T V M
This indicates a value smaller than the AX value. At this time, the process proceeds to step 65 and the TV value is incremented by one count. In the exposure meter of this embodiment, this means that the shutter speed is ITV shifted to the high speed side.

Here, TV indicates the base 2 logarithm of the reciprocal of the shutter speed. The process then proceeds to step 72.

In step 61 above, TIME/FN, J Sui, Chi (SW
13) has selected FN, step 62
Then, the AV determined from the display range of the aperture value of the exposure meter in this example is
MAX value, set FN, value AV corresponding to the value
, and if they are equal, jump 7 to step 72 without performing any operation. In step 62, AV. value and a
If the VMAX values are not equal, then the AV value will always be A.
This indicates a value smaller than the VMAX value.

At this time, the process proceeds to step 63, in which the AV0 value is incremented by 1 count.In the light meter of this embodiment, FN means that the value is shifted in the direction of narrowing down by one step. Thereafter, the process proceeds to step 72. In step 72, exposure calculation is performed on the changed TV, value or AV, value, and the display corresponding to the calculated data or the changed TV, value or AV, value is displayed at step 72. 73. Step 7
4, press the above up key (SW3) and down key (SW4).
) is turned off, the process jumps to step E1, that is, step 50 described above, and after performing the post-processing operation, the process is temporarily stopped. If the 7-up key (SW3) is not ON in step 60 above, skip to step 66, and determine whether the down key (SW4) is ONL in the same way as in step 60 above. . If the down key (SW4) is ON, proceed to step 67 and press the TIME/FN switch (
It is determined via key matrix 2 (KM2) whether SW13) is selecting TIME or FN, and if TIME is selected, step 70 is performed. In step 70, the TVMIN value determined from the display range of the shutter speed of the exposure meter of this embodiment is compared with the set TV value, and if they are equal, the process proceeds to step 72 without performing any operation. At 70, TV
If the value and the TVMIN value are not equal, then the TV value is always greater than the TVMIN value, and in step 71 the TV value is decremented by one count. In the exposure meter of this embodiment, this means that the shutter speed is increased in the direction of slowing down. Thereafter, the process proceeds to step 72. In step 67 above, T I ME/FN
, the switch (SW13) has selected FN, the process advances to step 68, and the FN of the light meter of this embodiment is selected.

The AVMIN value determined from the value display range is compared with the set AV value, and if they are equal, proceed to step 72.
If they are not equal, the AV value always indicates a value greater than the AVMIN value, and is decremented by one count in step 69. In the exposure meter of this embodiment, this means that the FN value is shifted by one step to the open side. Thereafter, the process proceeds to step 72, where the operations described in step 72 and subsequent steps m1 are executed, and a temporary stop state is entered.

If the down key (SW4) is not turned on in step 66, the process advances to step B in FIG. 6-3. Step B proceeds to step 80 and presses the memory key (SW5).
Key matrix 1 is used to determine whether
(KMI). The above memory key (S
If W5) is turned on, the process jumps to step 81. In step 81, it is determined whether or not the value of MN indicating the number of memory keys is 2. If MN is 2, that is, if 2 pieces of data have already been stored in memory, the process jumps to step 82. Step 82 above
Now, as explained in step 32 above, the display RAM corresponding to the data to be calculated is loaded so that the display in the display element (LCD) corresponding to the data to be calculated becomes E display. Stores the value corresponding to E display. Thereafter, the process proceeds to step 92. In step 81 above,
If MN is not 2, the process jumps to step 83, where MN is incremented by 1 count.In step 84, tq is determined to determine whether MN is 2.
If so, proceed to step 85. At this time,
The above memory key (SW5) is turned on to store two memories when one memory has already been stored.
indicates that it has been done. In step 85, the values of DATAI and DATA2 obtained by measurement are stored in the RAM where the second memory is to be stored. Step 8
6 indicates that the second memory has been executed. In order to light up memory mark 2 (shi), MN data is stored in (r?AM10) for display. As a result, the memory mark (shi) in the display element (LCD) lights up. At this time, since the first memory has already been executed, both memory mark 1 (evening) and memory mark 2 (shi) are lit. In step 84, if MN is not 2, that is, if the memory key (SWS) has been turned on without any memory being used, step 8
Proceed to step 7 and obtain the DATA 1 upper VD obtained by measurement.
The value of ATA2 is set to R where the first memory should be stored.
AM1: Store. Step 88 stores the data of MN in (RAMIO) in order to light up the memory l)-mark 1 (tank indicating that the first memory has been executed. Steps 86, 88, and 89 .9
Proceed to 0, perform exposure calculation corresponding to the final measurement value, and proceed to 9.
The value calculated in step 1 is displayed on the display element (LCD).
, and in step 92 press the memory key (SWS),
After confirming that the recall key (SW6) is turned OFF, the process jumps to step E, executes the above-described post-processing operation, and then temporarily stops. If the memory key (SWS) is not turned on in step 80, the process jumps to step 93, and it is determined whether the recall key (SW6) is turned on using the key matrix 1 (KMI).
If it is turned on, skips to step 941; if not, jumps to step C. In step 94, by outputting a High signal to the output terminal (PO4), the display lighting member (
LED) lights up.

In step 95, the I (key (SWS)), the S key (SW
S), 7 lag S I-[ indicating whether the exposure calculation executed by turning on the FIX key (SWIO) is being executed.
It is determined whether F is 0, and if it is not 0, that is, the above <S W 8 ), (S W 9 ), (S W
10)), in order to cancel this operation, in step 96, the SHF
is set to O, and in step 97 the display element T(LCD)
Inside H mark (ne), S mark (u), F mark (su)
In order to turn off the light, write S l-I in the above (RAM7).
Store the data of F. As a result, the above (SWS),
The exposure calculation by (SWS) and (SWI O) is canceled, and the process jumps to step 89, where the exposure calculation for the final measured value and its display are performed.

If SHF is O in step 95 above, that is, (SWS
), (SWS), and (SWI O), in step 98, the display element (L
The exposure meter of this embodiment determines whether all segments of the CD (CD) are turned off. In this case, the display is automatically turned off, and the activation of Exposure J in this example is as follows:
This is executed by turning on the recall key (SW6). In step 98, display all? 1' (If it is determined that the light is t', the process jumps to step 8 to calculate the final measured value of exposure, display the calculated data, and setting data, and also activates the exposure meter of this embodiment. Make it.

If all the displays are not off in step 98, jump to step 991 and check whether the display corresponding to the calculated data as shown in Table 1 is E.
Determine. This is to cancel the Ei indication that is executed when the memory key (SWS) is turned on with two memories already set. Step 99
If the display is determined to be E, step 8
Exposure calculation and display of the final measured value are executed. What if E is not displayed in step 99? If q is determined, it is determined in step 100 whether the memory to be called is the first memory or the second memory. R
When N is 1, the first memory is called up, and when it is 2, the second day's memory is called up.

In step 100, if RN is 2, step 10
Noyanbu to 1 and RN to 1 (rubbing. This and step 1
By the operation of 04, the above recall key (SW6) is turned on.
Memory calls are performed alternately between the first memory and the second memory.

In step 102, since the memory to be recalled is the second one, the signal that should cause memory mark 2 on the display to blink is stored in the above (RAMIG), so that memory mark 2 (shi) starts blinking. . In step 103, exposure 107 is performed on the data stored in the second memory, and the calculated data is displayed in step 108.

If the data is not stored in the first memory or the second memory, the first memory or the second memory is stored. 0 data is stored in A M, and the display at this time will be 0, and the number 1 or 2 that is called will be displayed.
You can now see that no data is stored in the memory of the block. When the battery is inserted, 0 is stored in the RAM that stores the first memory and the second memory. Step 109 is repeated until the recall key (SW6) is turned off in step 109, and then the process moves to the next step. The memory recall function of the light meter in this example is controlled by the recall key (SW
6) is valid while it is turned on, and when it is turned off, the display corresponds to the final measured value.

In step 110, data for turning on the flashing memory mark corresponding to the recalled memory is stored in the above (rlAMlG), and in step 89
．． Exposure calculation is performed on the final measured value in step 90, and displayed in step 91.

If RN is not 2 in step 100, that is, if the data to be called is the first memory, step 104; jump, set RN to 2, and step 105
The display element (
A signal for blinking memory mark 1 (evening) on the LCD is stored in the RAM 1G. As a result, the memory mark 1 (ri) starts blinking 111 times. Thereafter, in steps 106 and 107, exposure calculation is performed on the data stored in the first memory, and the calculated data is displayed in step 108. The subsequent operations are the same as those from step 109 described above.

If the recall key (SW6) is not turned on in step 93, the process jumps to step C to figure fj & 6-4. At step 120, memory clear N-(SW
7) is turned on is determined via the key matrix 1 (KMI).

If the memory clear key (SW7) is turned on, the process jumps to step 121, and if it is not turned on, the process jumps to step 129.

In step 121, M indicating the number stored in memory is
Nl:o, and in step 122, data 0 is stored in the RAM that stores the first memory and the second memory. In step 123, the SHF l:o is subjected to cell F, and in step 124, the display element (LCD) is
To turn off memory mark 1 (evening) and memory mark 22 (shi) of
M10) and S HF marks (u), (su), (
The SHF data is used as a signal to turn off the (R).
AM7). The above memory clear key (SW7
), the II key (SW8) and S key (S
W9), the exposure calculation by the FIX key (SWlo) is canceled. In steps 125 and 126, exposure calculations are performed using the data of the final measured values, and in step 127 they are displayed.

In step 128, after confirming that the memory clear key (SW, 7) is turned off, proceed to step E.
- and then pauses after performing post-processing operations.

In steps 129, 130, 131, press the H key (SWa)
, S key (SW9), and FIX key (SWIO) are turned on.
8) is ONL, in step 132, S IT
F is set to 1, and S is set to (RAM?) in step 133.
By storing the HF data, the I (mark (ne)) in the display element (LCD) lights up.S key (S W 9
) is ONL, in step 134 S II F
is set to 2, and S is set to (RAM?) in step 135.
By storing HF data, display element (LCD)
The S mark (U) inside will light up. FIX key (SWIO
) is ON, in step 136, S II F
is set to 3, and S is set to (RAM?) in step 137.
By storing HF data, display element (LCD)
The F mark inside will light up. In step 138, by turning on the FIX key (swio>), the measured value data is stored in the FIX memory to keep it fixed on the display as an exposure value. In the exposure calculation at step 139, (SWa).

When (SW9) and (SWI O) are turned on, the arithmetic processing to be executed is executed, and the calculated arithmetic value is displayed in step 140. In step 141, the H key (SWa), the S key (SW9), the FIX key (swi
After confirming that o) is turned off, jump to step E. This performs post-processing operations and then
The program will pause.

In steps 129, 130, 131 above, the H key (SW
a), S#- (SW9), FIX key (SWIO) is O
If it is determined that tq is not NL, skip to step D of rPJ6-5 diagram, step 1.50rMUL,
TI RES [Judge whether the ET key (SWII) is ONL. If it is ON, step 1
Proceed to step 51, and if it is not turned on, proceed to step E above.
The program continues with post-processing and pauses without performing any operations.

In step 151, the setting of the 5TNOLE/MULTI switch (SWI4) is set to 1++,
If MULTI is selected, the process advances to step 152, and if 5INGLE is selected, the process jumps to step E.

The above MULTI RESET key (S
Wll) is the above S1. This is a calm that is valid only when the NGLE/MULT I switch (SWI4) is set to MULTI. In step 152, the MU indicating the number of accumulations is performed.
LT I No is set to O, and in step 153, DATAI and DATA2, which indicate the accumulated measurement values, are set to 0. In step 154, GV, MULT I No.
The data to be calculated when the display is 0 and (SWI4) in Table 1 selects MULTI, in this case, the FN and m display are O. The display element now indicates that a new integration measurement can be started.

FIG. PtS7 is a flowchart showing a program executed by an interrupt generated when the internal timer 〇 of the microcomputer (CPU) exceeds 70-. However, this is executed only if this interrupt is enabled. In step 200, interrupts are prohibited, in step 201, timer 2 is incremented by one count, and in step 208,
Increment timer 1 by 1 quant. The timer 1 is used to measure between n and fr in the likely standby state in measurement when the setting mode switch (SWI2) is NON or C. In step 202, the above step 20
It is determined whether the value of timer 2 calculated in step 1 is greater than a preset value T2. In the case of the light meter of this embodiment, the value of T2 is set so that, for example, when 8 seconds have elapsed, the data of timer 2 becomes hotter than T2 at α.

” At Unistep 202, if Timer 2 is larger than T2, it outputs Low (, No. 3) to the output terminal (PO4) to turn off the display lighting member. At Step 204, the value of Timer 2 is set in advance. It is determined whether the set T is larger than a certain value.

In the case of the light meter of this embodiment, for example, the data of timer 2 becomes larger than T3 when 4 minutes have elapsed.
The value of T is set. If the timer 2 becomes larger than T, the process jumps to step 215, and the data for displaying the full display power of the display element (LCD) is input (
RAMI) to (RAMI6) and display element (
Turn off all displays on the LCD.

In Stainless Steel 1216, the output terminal (PO5) is Lowf.
111g1+I3 is supplied to No. J and (PO6).

In step 217, [1iH
By inputting the l+ signal, only the interrupts that occur are permitted, and in step 218, the timer 2 is set to O and the program is temporarily stopped. This allows the recall key (S
Since the strobe signal is being supplied only to
IH is made so that ONL of the recall key (SW6) is not activated.

In other words, even if other keys are turned on carelessly, no operation is performed. If timer 2 is smaller than T3 in step 204, the setting mode switch (SW12) is determined in step 205, compared with the previous state, and if there is a change in the setting of this (SW12). , in step 206, the setting data of (SW12) is changed to (
By storing it in RAM9), AMB I, C0RD
, NON, C mark (Y), (Force), (W) display changes will be implemented. If there is a change in the setting of the setting mode switch (SW12), in step 207, the TIME/
Determine the FN and switch (SW13) settings, and if there are any changes from the previous state, in step 208 (RAM6
By storing the data of the above (SW13) in ), the lower mark (b) in the display element 7-(LCD) is changed.

If there is no change in the above setting (SW13), in step 209, the SINGLE/MULTl switch (SW14)! If there is a change from the previous state, in step 210, the display element (LCD) 77)
MULT I,'p? -1 (+7), GVv-ri (nu)
, +-marks (g) are stored in (RAM4) and (RAM5) so that a predetermined correct display is performed.

If there is no change in each switch in steps 205, 207, and 209, in step 212, the input terminal (INTB
), and interrupts due to timer 0 over 70- are enabled, and the process returns to the address before entering the main interrupt operation.

Up to now, we have not discussed how to use the stack pointer in interrupt operations, but since the use of the stack pointer in interrupts is common and not directly related to the present invention, we have omitted it here. .

In steps 205, 207, 209 above (SW 12
), (SW'l 3 ), and (SW 14 ), the process proceeds to step 211 after the operation for each display, and the changed (SW 1
2) Store data such that the display corresponding to the data to be calculated according to the settings of t(SW 13 ) and (SW 14 ) becomes 0 from (RAMI) to (RAM5). The program then proceeds to step 212, which is a static switch (SW 12
), (SW 13 ), and (SW 14 ) are checked every time there is an interrupt caused by the internal timer 〇 over 70-.

Figures 8-1 and 18-2 show the I NT shown in Figure 6.
70-B is a flowchart showing the exposure calculation in the 70-chart.

At step 300 (SW8), (SW9).

(SWlo) is turned ON, it is determined whether the set SHF is 0, and if it is not O, that is, (SW8), (SW9)
.

If exposure calculation is to be performed by turning on (SWIO) or has already been performed, the process advances to step 308;
If it is 0, proceed to step 301. T in step 301
If the determination of IME/FN and switch (SW13) is successful and TIME is selected, step 30
4 and display data, that is, WDATA 1.
An AV meter is used to output the AV value using WDATA2. The AvRF calculation at this time is the following J calculation.

^801 = [1ATA1- TV, --(7
) FLAI = WDATAZ +GV, -(8)
2 AVlo = 2 8t4B1 +
2FLA1' (9) 8 VIO AVlo = log22 (10) 8 Vl
l = AVIO+ SV, -(1
1) In equation (7), WDATAI is the BV value of stationary light at a shutter speed of 1 second, and TV is a base-2 logarithm of the reciprocal of the set or calculated shutter speed. W D A T A of formula (8)
2 indicates the BV value of only the flash light. SV,
is an SV value of 180 sensitivity set externally. These calculations have already been discussed in detail in Japanese Unexamined Patent Publication No. 55-10569, so the details will be omitted here.

However, G V o in equation (8) is a value indicating how many steps brighter or tri (to make) the flash light, and is normally input as 0. Also, in equation (8), G V o
When indicates 0, that is, there is no flash light, the calculation is performed such that FLA 1 becomes O, whatever the value of GV. In the calculation of equation (9), a term representing a power of 2 is calculated such that when its antilog is 0, the term becomes O.

Only in this AV calculation in step 304, the calculated AV value is the FN of the exposure meter of this embodiment.

When the value is larger than the display range, a signal is given to (RAM 14) that causes the FN and mark to blink, and the OVF is set. On the other hand, if it is smaller than the display range, a signal is given to (RAM 14) that causes the FN and mark to blink, and the UDF is set. Of course, in the display range, OVI'
, tJDF is reset. FN in step 301
If o is selected, 5IN is selected in step 302.
Change the status of GLE/MULTI switch (SW14) to f9
If MULTI is selected, the number of exposures calculation in step 307 calculates the number of exposures necessary to satisfy the already set shutter speed and F Na value. Therefore, the following calculations are performed.

Δv10 = ^v, -sv, -m-
(12) 8881 = WD 8T to I-TV,
-(13) FLA1 - EnDAT^2
-□ (14) MULTINO=T
NT (MULTINO') --(16)H
ULTINO' ≠MULTINO Narabo MULTI
NO= MULTINO+12 = (MULTINO
INO)X (2Δ8111+2FL^1)-m-(1
7) AVIO AVIO=Iogz 2ΔVIO(18)^v,
= AVIO+SV, ---(19)(12
), AV is the AV value corresponding to the set FN value. The brightness of the stationary light at the shutter speed set by equation (13) is calculated, and equation (14) is simply a substitution. The denominator of equation (15) is the linear amount of likely brightness that is the sum of the constant light and the 7-ray light obtained in one exposure at the set shutter speed. Therefore(
15) FN set by formula. The number of exposures MULTINO'' for photographing is calculated based on the MULTINO value.
Since T INo' is a value that includes a decimal and the number of exposures is an integer, only the integer part of MtJLT I No' is defined as MULTINO in equation (16). MULTI here
If NO' and MULTI NO' are a ratio, that is, if the decimal part of MULTI NO' is 0, the FN to be displayed, the value is the set AV, the FN corresponding to the value as is, the value It is. However, MULT
I No' and MULT I NO are T'L<na"J
:i, M U L T t N O times no exposure t'li
, AV, +: The exposure is insufficient for photographing with the corresponding close FN and value. Therefore, by increasing MULTINO by one time, (
17), (+8>.

(19) Formula wo'X line, MLI L, T I N0jl
No Exposure Teno Δ~! The value is calculated and displayed. In other words, the set FNu value is displayed with a fraction attached. At this time, when MULTINO is less than 1, a signal for making the MULTI mark blink is added to the MULTINO display off signal,
(RAM4). At the same time, I set the OVF based on the fact that the measurement light was too bright. MULT
I No power bow When the value is 0 or more, M U L T I
No. 43 for making the mark blink is added to the iYI light signal of the MULTTNO display and stored in (RAM4),
UDF is set to mean that the measurement light is too dark.

Of course, if MULTINO is 1 to 9, ○VF
, the UDF is reset.

If (SW14) is selected as S I NGLE in step 302, the process proceeds to step 303, and the setting state of the setting mode switch (SW12) is determined. Here, if AMB I is selected, step 305
Otherwise, it jumps to Stain 1306.

In step 3()5, the set FN.

A shunter speed that satisfies the value is calculated.

8Vl')=AV, -SV, --m-(2
0) TVo = WD8 to 8 -8VIO--
-(21) (20) and (21) are general apex operations.

W D A T A 1 indicates the brightness of constant light at a shutter speed of 1 second, and includes a decimal part.

Therefore, TV in equation (21) also includes a decimal part, but this decimal part is displayed as a fraction of the set FN value. This TV. When indicates a high speed that exceeds the display range of the shutter speed of the exposure meter of this embodiment, TIME
A signal to make the mark blink is set in (RAM13), and since the measurement light is too bright, the OVF is set. Conversely, when indicating a slow shutter that is below the display range, a signal that blinks the TIME mark is sent to (RAM
13) and set the UDF because the measurement light was too high. Within the display range, O■r
, the UDF is reset. At this time, GV, MLIL
The TINO display is)) so that 11 lights are displayed (RAM 4
), (RAM5) are set.

In step 306, the set shutter speed and FN are
, the number of steps to increase or decrease the level of flash light necessary to obtain a proper exposure is calculated and displayed as a value called GV.

AV10=AV, -SV, -(20)TVI
= IIDATAI -AVIO--(21) TVI
≧'rv*Now If TV, = TVI + 1
-- (23) Other TVO=TVQ −
−<24) AV20 = WDATAI −T
V, −(25)2Δv30= 2^v10−
28V20 (26)V30 ΔV30 =, l□g22 (27)C
,V,' = AV30 - WDATAI2
- (28) GV, = rNT (GVo'
) ---(29)cv,'? Acv, if Gvon is 0 (:V, = GV, GV other than +1+h, = GV, -(31)8MBI =
WDATAI-TV, --(32)F! , A.I.
= WDATAI2 +GV, -(33)AVI
OAM[11+2FLAI −(34°2=2 ＾v1 AVIO” log 2 −(35)
AV, = AVIO+ SV, -
(36) The above is the calculation content in this step. (2
0).

Equation (21) is the calculation performed in step 305,
Equations (23) and (24) are used to determine whether the set shutter speed is appropriate. In other words, if the shutter speed derived from the relationship between the set FN value and the measured value of ambient light is faster than the set shutter speed, then the set shutter speed
If you take a picture with a combination of N and values, you will end up overexposed with just the constant light. Therefore, in such a case,
The shutter speed obtained from equation (23) is replaced with the set shutter speed to automatically create a situation that requires the minimum amount of flash light. (25), subtract the brightness of the stationary light from the value set linearly using the (2(+) formula),
The amount of light required as 7-ranoshu light is calculated and replaced with the apex value using equation (27). By executing equation (28), the excess or deficiency of the measured flash light is calculated. Also, if the value GV,' is displayed with a decimal part, it is sufficient to display the second GV, value, but in the light meter of this embodiment, G
Since the V value is displayed in one step pitch, (29), (30),
Correction is made using equation (31). In equation (29), GV,'
Let GVo be an integer of
And when GV is positive, the value of GV is increased by one step. If GV, is negative, the integer of GV,' can be defined as GV, and the same thing can be achieved, so there is no need to increase the value by one step.

When GV,' = GV, the decimal part of GV,' is O, so GV can be left as is.

(:12), (33), (34), (35), (36)
The formula is the same as the calculation in step 304, and is for calculating the fraction of the set FN value after calculating GV. If this GV is larger than the display range,
The GV and MULTINO display will be blank, and the GV
The signal of the blinking mark (nu) is stored in (RAM 5), and the UDF is stored because the measurement light is too dark.
Set 7. If GV, is smaller than the display range, the GV, MtJLT INo display (H) will be blank, and a signal that the GV mark will blink will be stored in (RAM5), and the measurement light will be too bright, so O
Set VF. If within the display range, OVF, UD
F is reset. At this time (RAM4), MU
L, TI% Now the mark (wa) goes out and MULT I N
o Data is stored so that the data is not displayed.

By setting OVF and UDF like this, over
When the mark (ツ) flashes, press the up key (SW3)
When the r mark (n) is blinking, the appropriate value will be displayed by turning on the grand key (SW4).

In step 308, step 3
04 is performed, and in step 309, 1
If the 1st memory is stored, AV calculation is performed for the 1st memory. In step 310,
If the second memory is stored, AV calculation is performed on the second memory, and in step 311 the FI
By turning on the X key (swio), FIX
If data is stored in /memory, AV calculation is performed for FIX memory. However, the answer to step 308 is AVI, the answer to step 309 is AV2, the answer to step 310 is AV3, and the answer to step 311 is AV4.

Next, the process proceeds to step F in the fjIJ8-2 diagram, and in step 312 it is determined whether it is 5HFIJtO, and if it is 0,
That is, if the operation executed by turning on any one of the keys (SW8), (SW9), and (SWIO) is not performed, the process skips to step 313.

In step 313, the AV displayed as digital
, calculate the deviation of AV according to the final measurement value,
Similarly, in step 314, if there is a memory for the first port, the AV and deviation according to the first port memory, and in step 315, if there is a memory for the second port, 2
The deviation from AV by the th memory is ΔA1
．． ΔA2. It is calculated as ΔA. This ΔA1. Δ
A21ΔA3 displays analog dot 7 (RA
MII), and an analog dot lights up as a deviation from the digital value.

If S If F is not 0 in step 2 (step 312), tq is determined to be 1 in step 316, and if it is 1, step 3171 is skipped. Here, it is determined whether two memories are stored using MN indicating the number of memories, and if two memories are stored, the size of the two memories is determined in step 318, and the memory in the second slot is determined. If so, in step 319, a predetermined value of BIAS is subtracted from the AV from the second memory. With this, B I AS
H only indicates an open state as a value of FN.

In step 318 above, if the first memory is larger, in step 320, from the first memory to B
Subtract IASH. If it is determined in step 317 that two memories are not included, step 3
In step 21, it is determined whether one memory is included. If one memory is included, the operation of step 320 is performed; if one memory is not included, the final measured value is stored as 180 memories in steps 322 and 323. In step 324, AV1 for the final measurement value is substituted for AV, and in step 325, MN is set to 1. Thereafter, 320 steps of calculation are performed. If SHF is not 1 in step 316,
In step 326, it is determined whether the value is 2 or not, and if so, the step 3271 performs this process.Step 327
335, compared to steps 317 to 325, in step 330, a predetermined value BIASS is added to the AV from the first memory, which is smaller than the second memory; 329, the AV of the second memory is smaller than the first memory.
) 13 I A S S is added to 6χ.
Since it is the same as up to 25, it is omitted (.

In step 326 above, S l (if F is not 2, 31
1 Since F is 3, AV from the FIX memory is replaced with AVo and steno 1336. By executing steps 316 to 329 and turning on the H key (SW8), a constant value (BIASII ) only FN, open value FN
, by instructing the value display (wo) to display and fix an instruction value to overexpose the calculated value by that fixed value.

Also, by turning on the S key (SW9),
By instructing the FN0 value display (DE) to reduce the FN value by a certain value (BIASS) for the darker value of the memorized values or for the final measured value,
An instruction value for underexposing the total value by a certain amount is displayed and fixed.

Also, by turning on the FIX key (SWIO),
Fix the measured value to a digital display, specifically FN, value. Subsequent measured values are not displayed on the digital display 1, but are displayed on the analog dot as ΔA1 in step 313 as a deviation from the analog index O. In other words, the analog decoder (DC?) is configured so that the analog dot on the analog index θ is always expressed as a value corresponding to AV. Also, 1
The number memory is similarly displayed as a dot on the analog dot as a deviation from the analog index 0, with ΔA2 as the deviation from the AV corresponding to the digital display (FN, value display). Similarly, the second memory is ΔA3, which is the deviation from AV corresponding to the digital display (FN, value display), and is displayed as a dot on the analog dot as the deviation from the analog index 0.

In the above embodiment, by turning on the It key (SWa), the S key (SW 9 ), and the FIX key (SWIO), the calculated value is fixed on the digital display, and subsequent measured values are This is displayed on the analog dot as a deviation from the digitally displayed value. As a result, when the value calculated by turning on the H key (SWa), S key (SW9), and FIX key (SWIO) is fixed as the camera's exposure value, the measured value at each point in the subject What is the relationship between the values and the fixed values mentioned above? In other words, what kind of finish will each point in the subject have on the final image if the subject is photographed with the fixed values? Can be understood on analog dots.

By turning on the memory key (SW5), the measured values are memorized, and it is possible to recognize how many values are currently memorized by lighting up the memory mark corresponding to the memorized number. Furthermore, when recalling a memory value using the recall key (SW6), the memory mark corresponding to the recalled memory flashes, making it possible to recognize which memory is currently being recalled.

MtJLTI rjESET key (SWII)
I NGLE/MULT I switch (SW14) M
By providing it outside the ULT1 position, what should originally be composed of two switches can be composed of one switch member.

By turning on the recall key (SW6), the data held in the microcomputer (CPU) will not be destroyed or changed, so the display lighting member that illuminates the display element (LCD) (LED)
The recall key (SW6) can also be used as a starting switch for lighting up.

In this example, when a measurement is performed, only the digital display that is displayed as the measured value becomes -Momentary Planck,
Displays corresponding to other set data continue to be displayed regardless of the measurement operation.

Such a display operation during measurement makes it easy to see the measurement data and confirm the measurement.

In the NON and C measurements in this example, by setting the light ↑ to the rocky state once, the measurement is updated every time 7 lashes of light enters the exposure meter in this example within a certain period of time. There is no need to press the measurement button or the like to enter the light standby state every time you perform a measurement.

Further, it can be easily recognized whether the exposure meter of this embodiment is currently in the light standby state by the blinking operation of the NON and C marks in the display element (LED).

In addition, in this example, when the shutter speed and FNo value are set in advance and a photograph is taken with this combination of exposures, the brightness of 7 mm is calculated, which is necessary to give an appropriate exposure. The calculation to do this is programmed. If you fix the FNo value due to depth of field etc. and shoot using 7 rays, you can determine the required FN, However, in the light meter of this embodiment, the light intensity of the flash is instructed by one measurement.

Further, the exposure meter of this embodiment is programmed with calculations for calculating the number of exposures necessary to obtain appropriate exposure using a preset shutter speed and FNo value. Up until now, calculations and measurements have been repeated to find the number of integrations to reach the required FN value, that is, the number of exposures, but in this example,
With one measurement, the required number of exposures can be calculated and displayed.

In the above embodiment, the memory mark 21 (ri) and the memory mark 2 (shi) are respectively numbered "1" and "2".
At the same time, in step 8G of the 70-chart in Figure 6-3, you may have the memory mark 2 turn on and the memory mark 1 turn off. The number of values can be displayed numerically. In this case, as in step 105 or 10G in Figure 6-3, the mark (number) corresponding to the recalled memory value may be blinked, but only the numbers corresponding to the recalled memory value are displayed continuously. It may be configured so that Furthermore, the number of stored items is displayed using a 7-segment display. You can also do it. Further, the number of memory items may be three or more.

(The following is a blank space) 2. As detailed above, the photometric device according to the present invention includes a photometric means that separates and measures light containing a flash light component into a steady light amount and a 7-lash light amount. , a shutter speed setting means for setting a shutter speed, an aperture value setting means for setting an aperture value, and an exposure m calculation means for calculating an exposure amount for obtaining a proper exposure from the set shutter speed and frit value;
a deviation calculation means for calculating a deviation amount between the calculated exposure amount and the photometry amount measured by the photometry means; a ratio calculation means for calculating a ratio between the calculated deviation amount and the flash light amount measured by the photometry means; , and display means for displaying the calculated ratio. With this configuration, the excess or deficiency of the amount of flash light relative to the appropriate exposure is displayed as a ratio by the display means, which is different from conventional methods. Compared to the method of repeating trial ffi errors, it is possible to more easily and accurately find a state in which proper exposure can be obtained.

[Brief explanation of drawings]

Figures 1 to tj%8 show examples of the present invention,
Figure 1 is a block diagram showing the overall configuration, Figure 2 (a) is a front view of the exterior, Figure 2 (b) is a side view of the exterior, Figure 3 is an explanatory diagram showing the display, and Figure 4 is the display section. The block diagrams shown in FIGS. 5 to 8 are 70-charts showing the processing procedure. (C1) (C2); Photometry means, (SW3) (SW4) (SWI 3): Shutter speed setting means, aperture value setting means, (CPU); Exposure amount calculation means, deviation calculation means, ratio calculation means, ( LCD); Display means. that's all

Claims (1)

[Scope of Claims] 1. Photometering means for separating and measuring light including a flash light component into a steady light amount and a flash light amount, a shutter speed setting means for setting a shutter speed, and an aperture value for setting an aperture value. a setting means; an exposure amount calculation means for calculating an exposure amount for obtaining appropriate exposure from the set shutter speed and aperture value; and a deviation amount between the calculated exposure amount and the photometry amount measured by the photometry means. A photometry device comprising: a deviation calculation means for calculating a ratio between the calculated deviation amount and the amount of flash light measured by the photometry means; and a display means for displaying the calculated ratio. Device. 2. The photometry device according to claim 1, wherein the ratio calculation means calculates a logarithm value of the ratio between the amount of deviation and the amount of flash light measured by the photometry means. 3. A patent characterized by having means for automatically switching the set shutter speed to a higher speed side when the amount of steady light measured by the photometry means is greater than the amount of exposure calculated by the exposure amount calculation means. Claim 1
Photometric device as described in section.