JPS62161023A - Apparatus for measuring flash light - Google Patents

Abstract

PURPOSE:To make it possible to repeatedly measure flash light simply by one operator, by controlling a photometric means and an optical trigger means by a control means so as to together bring both of them to an operative state. CONSTITUTION:A photometric means C1 measured flash light and, when it is detected that flash light begins to emit, an optical trigger means C4 outputs an optical trigger signal for operating the means C1. A control means CPU controls both means C1, C4 so as to together bring the same to an operative or non-operative state. This flash light measuring apparatus is operated as mentioned above. Therefore, a flash device and this measuring apparatus are arranged at relatively near positions and, when the measuring result of this measuring apparatus is read from the position of the flash apparatus, the means C1, C4 are controlled by the means CPU so as to be together brought to the operative stat to make it possible to repeatedly measure flash light without operating the manual operation switch of the measuring apparatus at every measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a photometric device that measures the intensity of incident light, and more particularly to a flash light measuring device that measures the intensity of flash light.

Conventional flash light measuring devices have a manual operation switch to put the device on standby in a state where it can receive flash light, and when this switch is turned on, it enters a state where it can receive flash light, and then it starts to receive flash light. It is known that the measuring operation is started by Such an apparatus is configured such that once one flash light measurement is completed, the measurement of seven Lassie lights is not permitted.

Therefore, when measuring flash light again, it is necessary to operate the manual operation switch again. With such a configuration, if measurements of 7 rays are repeated 9 degrees, two operators are required: one to operate the 7 rays and one to operate the photometric device. .

Therefore, it is an object of the present invention to provide a flash light measurement device that can easily and repeatedly measure seven Lassie lights by a human operator.

In order to achieve the above object, the flash light measuring device according to the present invention includes a photometer for measuring seven lasier lights, and a light meter for operating the photometer when detecting the start of flash light emission. It is characterized by having a light trigger means for outputting a trig signal, and a control means for controlling both the photometry means and the light trigger means to be in an active state or both to be in an inactive state.

Therefore, according to the present invention, the flash device and the flash light measuring device are arranged relatively close to each other, and the flash light can be measured from the position of the flash device. ! When the measurement result of the position can be read, the control means controls both the photometry means and the optical trigger means to the operating state.
It is possible to repeatedly measure flash light without operating the manual operation switch of the flash light measuring device every time a measurement is made.

(The following is a blank space) Dog m FIG. 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. (C2) and the optical trigger detection circuit (C4). The optical trigger 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 also provides an integration start signal to the microcombination circuit (C2). Eta (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 above light bird is -
The integration start signal is transmitted from the detection circuit (C4) to the integration circuit (C2) when the setting mode of the exposure meter in this embodiment is the non-hood mode (responses to light from a flash light emitting device without using a hood). It is valid only in the mode in which the integration is started by
- inhibited by a signal from the output terminal (POS) of the computer (CPU).

The above-mentioned integrating circuit (C2) has a detection circuit (
C4) or a signal from the output terminal (poi) of the microcomputer (CPU), the electric signal corresponding to the incident light from the photoelectric conversion circuit (C1) is transmitted at an externally set date time or in advance. Integration is performed for the set time. Above output terminal (POI)
The addition of / to the line connecting the integration circuit (C2) indicates that there is a plurality of connection lines.

Hereinafter, lines marked with / indicate multiple lines. The electric signal integrated by the integration circuit (C2) is converted from analog to digital in the next stage AD conversion circuit (C3) by a signal from the output terminal (PO2) of the microcomputer (cpu). , the AD-converted digital signal is transmitted to the input terminal (pH) of the microcomputer (CPU), together with the AD conversion end signal.

The AD conversion circuit (C3) can be implemented using various methods such as a double integral method or a successive approximation method, but the details are not directly related to the present invention, so a microcomputer (CPU) is used.
The input terminal (P I 1 ), the output terminal (PO 2), and the AD conversion circuit (C3) can support various AD conversions, so a detailed explanation will be omitted. It includes a ROM that stores programs, a RAM that temporarily holds data, an accumulator that performs various calculations, a timer that generates signals at regular intervals, various decoders, output terminals, and input terminals. There is.

Input terminal of the above micro combinator (CPU) (
When the power is turned on, a reset signal is input to RESET from the reset signal generator (G E 3 ), and the microcomputer (CPU) starts the program from a predetermined address stored in the ROM. Start execution. The reference pulse generator (GEL) is connected to the input terminal (PI3) of the microcomputer (CPU').
) to input the oscillation pulse to the microcomputer (C
The PU) advances the program according to the oscillation pulses from the reference pulse oscillator (G E 1 ), counts the oscillation pulses from the reference pulse oscillator (G E 1 ) by an internal timer 〇, and keeps the oscillation pulses almost constant. An internal interrupt is generated every time.

This interrupt by timer 〇 is common in microcomputers currently on the market, so a detailed explanation thereof will be omitted.

Output terminal of the above microcomputer (CPU) (
PO8) outputs a High signal at the same time as the start of measurement when the setting mode of the exposure meter in this embodiment is corded measurement, operates the synchronization driver (DVI), and short-circuits the synchronization terminal (T1). In addition, the output terminal (PO
3) is connected to a display driver (DV2). The display driver (D V 2 ”) drives the display element (LCD), and contains RAM corresponding to the alpha lamp segment of the display element (LCD).
have. The blinking oscillator (GE2) supplies a blinking pulse to the display driver (DV2), and selects a segment in the display element (LCD) to blink according to the blinking pulse. It blinks.

Output terminal of the above microcomputer (CPU) (
PO4) according to the program.
V 3 ) to supply a signal to the lighting driver (
D V 3 ) is Hi from the output terminal (PO4).
The transflective type display element (LCD) is activated by the gh signal.
) is turned on. The ISO setting section (SWI) allows you to set the film sensitivity based on ISO standards using an external dial.The film sensitivity value, that is, the ISO value, set in the above ISO setting section (SWI) is set by a code corresponding to the ISO value. , the above microcomputer (CP
It is input from the input terminal (PI5) of U).

Key matrix 1 (KM 1 ) is for knowing the status of normally open switches from (SW2) to (SWII), and the output terminal (PO5) 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).

(SW 10 ) and (SW 11 ) are output, and the output terminal (POO) outputs a signal for strobing the recall key (SW 6 ). The input terminal (PI3) is connected to the key matrix (K
This is a terminal into which a signal indicating the status of the switches (SW2) to (SWII) is input from MI), and the strobe signal output from the output terminals (pos) and (POO) is a High signal, which is set according to the program. , strobes each switch in time series, and when the strobed switch is ON, the input terminal (PI3
) is input with a Higb signal.

The signal inputted to the input terminal (PI3) is connected to the input terminal of the ORDATE (ORI), and the output of the ORDATE (ORI) is connected to the input terminal of the microcomputer (ORI).
It is connected to the input terminal (INTB) of the CPU. When the microcomputer (CPU) program is in HALT state, the output terminal (P O5)
If t(YI/(P O6)) is outputting a High signal, turning on any of the switches (SW2) to (SWII) will cause the input terminal (INTB) to go High.
The gh signal will be input, and this input terminal (
In response to an interrupt signal inputted to INTB), the microcomputer (CPU) jumps from the HA'LT 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,
By turning on the measurement circuits (C1), (C2), and (C3), a series of measurements is started according to the setting mode.

(C4) is maintained in a measurable state (flash light standby state for non-coded measurement!!).

(SW3) is the normally open switch (
Hereinafter, this key 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 the normally open switch (
(hereinafter referred to as the down key), and the TIME or FN key set in the data select switch (SWI3) above.
This reduces the value of o. (SWS) is a normally open switch (hereinafter referred to as memory key) connected to the memory key, and when turned on, the measured value data is transferred to the specified RA in the microcomputer (CPU).
M f: Store measurement value data.

(SW6) is a recall key, and the display element (L
CD) is off, the display element (LC
D) The display contents before the lights go out are turned on.

Further, 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). Do the following.

(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 (SW5) is erased. (SW8) is a normally open switch (hereinafter referred to as I (key)) connected to the H key (highlight reference exposure calculation key);
W9) is a normally open switch (hereinafter referred to as S key) connected to the S key (calculation key for shadow reference exposure),
(SWIO) is a normally open switch (hereinafter referred to as the FIX key) connected to the FIX key (calculation key for fixing measured values).

When each switch of the H key (SW8), S key (SW9), and FIX key (swio) is turned on, the exposure calculation that has been programmed in advance for those switches is performed, and the results are displayed on the display element (L). CD). (SWII) is MULTI RE
A normally open switch (hereinafter referred to as MUL) connected to the SSET key
This key is called the TI RESET key) and is used to start a new measurement when performing Mt calculation measurements.

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).
O7) outputs a strobe signal in time series, and switches (SW 12 ), (SW 13 ), (SW 1
4), the key matrix (KM2) is connected to the input terminal (cp'tB) of the given microcombinator (cp'tB).
PI4), switches (SW 12 ), (SW 13
)t(SWI4) signal is transmitted.

(SWI2) is AMBI, C0RD, NON, C
is a switch that is selectively set to one of three positions (hereinafter referred to as a setting mode switch), and when AMB I is selected, the exposure meter of the present invention measures ambient light, When C0RD is selected, a signal is output to the synchro driver (DVI) to cause the flash device connected to the cord to emit light, and the flash light is measured. Furthermore, when NON or C is selected, the program is programmed to start cordless flash light measurement by generating 7 flash light.

(SWI3) is a switch that is selectively set to one of two positions, TIME and FN (hereinafter referred to as TIME/FN).
N, switch), and the measurement result when TIME is selected is FN, the value is calculated and displayed as the answer. ), the shutter speed setting value displayed on the display element (LCD) can be changed. Also, the glue mark around the TIME mark in the display element (LCD) is illuminated. The above TIM E /
F N , when the switch is selected to F N o, press the above up key (S W 3) or down key (
By operating SW4), the set values of FN and values displayed on the display element (LCD) can be changed. Also, by performing the measurement, the 1 set by
,'N. The answer to the question that satisfies the value is 1iiE tl
- A so-called aperture-priority measurement is carried out, which is displayed. At this time, the FN mark (B) around the FN mark (R) in the display element (LCD) lights up.

(SW”] 4) is a switch (hereinafter referred to as the SI NGLE/MULT I switch) that is selectively set to either of the two positions, S I NGLE or MULT T, and when S I N0LE is selected. In the measurement when MULTI is selected, a single measurement is performed, and in the measurement when MULTI is selected, an 82 calculation measurement or an integration calculation measurement is performed.

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

In Figure 2, the S INGLE/MULT I switch (SWI4) and the MULTI RESET key (SWI4)
The positional relationship of WII) is as shown in the side view of FIG. The MULTI RESET key (SWI 1) is only turned on when the 5INGLE/MtJLTI switch (SWI 4) is set to the MULTI position.
LE/MULT I switch (SWI4) and MULTI
The RESET key (SWII) is configured with one switch. In other words, S I NGLE/MULT I
MULT outside MULT II of switch (SWI4)
IRESET bonoshin is provided, and MULT
MULT by pressing the switch further down from the I position.
I The operation when the RESET key is ONI is executed. Further, the switch that has been pressed down to the MULTIRESET position is configured to naturally return to the MULT I 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 a display-related portion of the microcomputer (CPU).

The display driver (DV3) has the display element (L
Although a static type is shown in which outputs are made individually corresponding to each segment of a CD, a dynamic type which is driven by a common signal may also be used.

The microcomputer (CPU) has an RA for transmitting display data to the display driver (DV3).
M is prepared from (RAM1) to (RAM16). (RAM12) has the above display driver (D
Data for outputting a lighting signal is stored in the address (A1) for lighting the ISO mark (V 3 ). (RAMI 3) is the display driver (D
RA for outputting a lighting or blinking signal to the address (A2) corresponding to the TIME mark ()X) of V3)
It is M. (RAM14) is the display driver (D
, V3) FN, address (A) corresponding to mark (ru)
3) is a RAM for outputting a lighting or blinking signal. (RAMI) stores SVo corresponding to the ISO value set by the above ISO setting unit (SWI), is connected to the ISO decoder (DCI), and is connected to the above ISO setting section (SWI).
The decoder (DCI) converts the above (RAMI) data into
It is decoded into a hood that can be lit by the display element (LCD) and stored in the ISO display address (A4) of the display driver (DV 3 ). 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> is a TV corresponding to the shutter speed set by the up key (SW3) or the gran key (SW4) or the shutter speed derived by arithmetic processing. Values are stored, 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).
The code is decoded into a code that can be turned on by CD) and stored in the TIME display address (A5) of the display driver (DV3). The TIME display address (A5) of the display driver (DV3) is connected to the TIME display (d) of the display element (LCD), and
) to display the lower price corresponding to the TV and data stored in the TV.

"S" in the TIME display (D) in the display element (LCD) indicates seconds, and the TIME decoder (D) lights up when the shutter speed is from seconds to 59 seconds.
C2), and similarly the TIME display (d) is decoded.
The above TIME decoder (D C
2) is decoded.

(RAM3) is an AV corresponding to the FN value set by the up key (SW3) or the grand key (SW4) or the F No value derived by arithmetic processing.

The value is stored and connected to the FN value decoder (D C3), and the FN o value decoder (D C3) is
The above (RAM3) data is transferred to the above display element (LCD).
) into a code that can be turned on, and enter the display address (A
6). The above display driver (DV 3'
), (mi indicator address A6) is connected to the FNo display of the display element ('LCD), and displays the value corresponding to the AV and data stored in the (RAM3). (RAM4) is S INGLE/MUL
The MtJLTI value indicating the cumulative number of measurements or the number of multiple exposures derived by arithmetic processing when the T I switch (SWI4) is selected to the MULTI side is stored, and the MtJLTI value is stored in the GV and MULTI values through the OR gate (○R3).
Connected to N○ decoder (DC4), the above GV, MUL
I TNO defugu (DC4) is the above (RAM4
) is decoded into a code that can be lit by the display element (LCD), and
3) Store in GV, MULT I No display address.

GV of the above display driver (DV3).

The MULTIN○ display address (A7) is connected to the GV and MULTINo display of the display element (LCD) above, and the MULTINo display address (A7) stored in the above (RAM4)
Display the value corresponding to No data.

Also, part of the MULT I No data (RAM4) is the MtJLTI of the display element (LCD).

The above display driver (D) connected to the mark (S)
V3) MULTI v-ri7do1zX(A8)I:
MOLTI of the above display driver (DV3)
Mark (lights up or flashes January).

As the above (RAM4) MOLT INo data, 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 stored (RAM5).

Above S INGLE/MOLTI switch (SWI4)
When SI N0LE is selected, MULT
I have no data! : Su'), above (R
All data input from AM4) to the above ORD (OR3) becomes a LOW signal, while the above terminal (T2)
) outputs a HIGH signal, and the above GV.

The MULT I No decoder (DC4) has the above (
The data from RAM5) is and date (ANDI)
, is input via ORDATE (OR3). At this time, MULT of the above display driver (DV3)
I,'! The mark address (A8) has the above display element (
A light-off signal for the MULT I mark (LCD) is input.

The above GV, the GV stored in the above (RAM5) input to the MULTIN○ decoder (DC4).

The data is from the above GV, MULTI No decoder (D
C4), the display element (L
The GV and MULT INo display of CD) is shown above (RAM
It lights up in response to the GVo data stored in S). At the same time, the GV of the above display driver (DV3)
A lighting or blinking signal is supplied to the mark address, and a ten mark or - mark (
(g)).

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

When data 0FFH is stored in (RAM4) and (RAM5), a busy signal is transmitted from each RAM to the corresponding decoder, and each decoder transmits a light-off signal to the display address for the decoder. be. (
RAMf3) 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 S mark address. Above T
IME/FN.

When the switch (SW13) selects TIME, the TIME mark (
The S mark (b) around the mark (c) lights up, and when FN is selected, the S mark (b) around the FN mark (l) lights up.

(RAM?) is H key (SW8), S key (SW9)
, SHF data determined when each of the FIX keys (SWIO) is turned on is stored, and if the SHF data in the above (RAM7) is other than 0, it is processed by the SHF decoder (D C5). It is decoded and stored in the SHF mark address (A12) connected to the SHF mark of the display driver (DV3), and the S mark (U) of the display element (LCD) is
, H mark (ne) or F mark (ke) as SHF
Lights up according to the 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.
lag is stored, and the o of the display element (LCD) is
The overunder network address (A13) connected to the verv-ri(tsu) and underv-ri(n)
), flashing signal of over mark (ツ) or under
Gives a blinking signal of mark (n). (RAM 9)
stores the state of the setting mode switch (SW12), and when the above (SW12) selects AMB I, a signal that lights up the AMB I mark (Y) on the display element (LCD) is stored. The above display decoder (D
V 3) AMBI, CORD, NO
Supply to N, C mark address (A14), C0R
When D is selected, a signal that lights up the C0RD mark (power) is supplied to (A14). Also, NON, C
When is selected, a signal is supplied to (A14) that causes the NON and C marks (wa) to light up or blink.

(RAM16) stores a signal for blinking memory mark 1 or memory mark 2 of the display element (LCD), and (RAM10) stores MN indicating the number of stored measurement values.

The above (RAMIO) MN data is sent to the MN decoder (D
C6), when MN is 0, memory marks 1 and 2 are turned off, when MN is 1, memory mark 1 is lit, and when MN is 2, memory marks 1 and 2 are lit. orday) (via OR2),
Memory marks 1 and 2 of the above display driver (D■3)
, is supplied to address (A15). Above (RAM16)
When the recall key (SW6) is turned ON, the flashing information of memory mark 1 (yes) or memory mark 2 (evening) is supplied to memory mark 1°2 and address (A15) via OR date (OR2).

(RAM15) stores the lighting signal by executing the display program routine of the program, and stores the lighting signal in the analog index address (A1) of the display decoder (DV3).
6) lights up the analog indicator of the connected display element (LCD).

(RAMII) is the above, S, H, F mark (U), (
When S) and (N) are not lit, the deviation from the stored value based on the last measured value is stored, and S is displayed.

When the H, 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 debugger (DC?) decodes the data stored in the RAM II above so that the reference value corresponds to the dot above the 0 of the analog index on the display element (LCD). Then, it is transmitted to the analog dot address (A17) of the display driver (DV3). The analog decoder (DC?), the analog dot address (A17), and the analog dot in the display element (LCD) are not directly related to the present invention, so details thereof will be omitted.

Furthermore, when a blinking signal is input to each address (AI 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
) The display driver (DV3) has the function of supplying the information to The explanation here is that the addresses of the microcomputer (CPU) and the display driver (DV3) are connected in parallel, but the addresses of the microcomputer (CPU) and the display driver (DV3) are connected in parallel. From the above display driver (DV
3) A method of transferring data to each of the seven addresses can also be considered. In addition, although the display here has been explained as being performed by a decoder etc. configured in the microcomputer (CPU), it is also possible to perform decoding as a program stored in ROM. It is.

Next, the operation 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 the ttSi diagram, a reset signal is supplied from the reset generator (GE3') to the input terminal (RESET) of the micro combiator (CPU), and the micro combiator (CPU)
starts execution of the program from a predetermined ROM address. Figure 5 shows the reset to the above input terminal (RESET).
70-chart showing a program to be executed when ff1 is input. In step 1 (c p
Set the stack pointer in u ) to a given value,
In step 2, each output terminal in the (CPU) is set to its initial state. In step 3, the above ISO setting section (S
Input the ISO value set in the WI) with the code to the input terminal (
PI5) and stores the data in (RAMI). In step 4, we store the value TV, R
A value corresponding to a predetermined initial shutter speed value is stored in AM. Similarly, in step 5, the predetermined initial FN is stored in the RAM that stores the value AVo.
Stores the value corresponding to the 0 value. In step 6, the MOL indicating the number of cumulative exposures or the number of multiple exposures obtained by calculation is
GV instructs to increase or decrease the amount of light of the flash in step 7 by setting O to the RAM that stores T I NO. R to store
In step 8, 0 is stored in AM, and in step 8, MN is stored in memory, which is stored in RAM. 1 is stored in each.

In step 10, timer 1 and timer 2, which are used as counters to generate a certain amount of time, are reset, and from then on, measurement of a certain amount of time is started. In step 11, the H key (SWS), S
When either the key (SW9) or the FIX key (swio) is turned on, 7 lags called SHF are reset to O.

In step 12, when the value derived by calculation after measurement is outside the display range, a 7-lag mark is set to light up the over mark (tsu) or under mark (n).
Set OF, UDFI::O. In step 13,
Above (RAM6), TIME/FN0 switch (SW
The setting state of I3) is stored, and in step 14, the above (
The setting state of the setting mode switch (SWI2) is stored in RAM9). Step 15 is the above S INGLE/
The setting status of the MULTI switch (SWI4) is
20). In step 16,
The above SI NGLE/MOLT r switch (SWI
4) is set to 5INGLE, step 1
7, and if MULTI is selected, in step 18.19, the display element (LCD)
(RAM 4) so that the GV and MOLT I No displays display data corresponding to MULT I No.
, (RAM5). TI in step 17
When the ME/FN switch (SWI3) is set to FN Ot-, the above setting mode switch (SWI2
) has selected C0RD, NON, or C,
Jumping to step 22.23, the display element (L
GV of CD), GV on MULTIN○ display. (RAM4) and (RAM5) are set so that the data of is displayed. Otherwise, jump to step 20.21 and set the display element (LCD) + 7) GV, MULT
(RAM 4) so that the rNo display is blank.
, (RAM 5 ) are set. Thereafter, proceed to step 24, the display program, where the above (RAMI)
.

(RAM 2 ), (RAM 3 ), (RAM
6), (RAM?)t(RAM8), (
RAM 9 ), (RAM 16 ).

(RAM 10), (RAM 15), (RAM
11).

(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 High.

After this, when any of the keys from (SW2) to (SWII) is turned on, a High signal will be input to the input terminal (INTB) of the microcomputer (c p u ). In step 26, an interrupt operation is executed when a High signal is input to the input terminal (INTB), and the microcomputer (CP)
The timer 〇 in TJ) is the reference pulse oscillator (G
The oscillation pulses from E 1 ) are counted, and an interrupt operation is enabled to be executed when an overflow occurs.

At step 27, the microcomputer (CPU)
).

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

Figures 6-1, 6-2, 6-3, 6-4, and 6-5 show that a high signal is input to the input terminal (INTB) of the microcomputer (CPU). Shows a program when it is executed as an interrupt. In step 30, the microcomputer (CPU
) input terminal (INTA).

Interrupts that occur when a High signal is input to (rNTB) and interrupts that occur when the internal timer O exceeds 7° are prohibited. In step 31, it is checked via key matrix 1 (KM 1 ) whether the measurement button (SW2) has been turned on. If the measurement button (SW2) above is OFF, jump to step A.
If it is ON, step 32 is executed. In step 32, the setting mode switch (SW 12
), T I ME/FN, switch (SWI 3), S
Since the calculated data differs depending on the combination of the states of each switch of the I NGLE/MULT I switch (3W14), the setting state of each switch is detected and the data in the display element (LCD) corresponding to the calculated data is (RAM2), (RAM3) to blank the display.
.

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

Table 1 shows the above setting mode switch (SWI2).

TI ME/FN, switch (SWI3).

SI NGLE/MULT I switch (SWI4)
Calculated data based on the combination of the states of each switch,
Display driver (DV3) answer, display element (L)
2 is a table showing the display contents of calculation data of CD.

To explain with an example in step 32, the above S ING
LE/MULT I switch (SWI4) is 5INOL
E, TIME/FN, Sui, 2chi (SWI3) is TIM
When the setting mode switch (SWI2) is set to C0RD, the calculated data is AV, and by storing the data ○FFH in (RAM3), the data in the display element (LCD) is FN, the display will be blank.

In addition, the above S INGLE/MULT r switch (S
WI4) is S I NGLE, T I ME/FNo switch (SWI3) is FN, setting mode switch (SWI3) is
When WI2) is set to C0RD, the calculated data is GV, and 0FF is stored in the above (RAM4).
Data H is stored, and data is set in the RAM 5 so that the GV mark of the display element (LCD) lights up and the 10 mark, GV, and MULT INo display become blank. As a result, the GV of the display element (LCD), MULT I No display (ch), MULT, I,
The current mark (su) and ten mark (g) go out, and only the GV mark (nu) lights up.

In addition, the S I NGLE/MULT I switch (SW
I 4) 7rMUL”M, TIME/FN, switch (
S1113) is T I ME, setting mode switch (S1113) is
When WI2) is set to AMB I, the calculated data lat, MULT I NO and AV, ?
be. At this time, 0FFH is stored in the above (RAM3), and the RAM (FLA) stores the measurement data of the flash light.
0 is stored in SHRAM). The details of the measurement method will be omitted since it is not directly related to the present invention. In step 33 above, set mode switch (SWI2)
) has selected C0RD, skip to step 35 and select the microcomputer (CPU).
) output terminal (PO2) is set to High to drive the synchronization driver (DVl), and 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 this measurement is completed, the constant light is measured for a predetermined period of time, the constant light measurement value is stored in the above (AMBI RAM), and the measured value of the flash light including the above stationary light and the above (
From the constant light measurement values stored in the AMBI RAM), the values of only 7 runs of light are calculated and the results are stored in the FLASHRAM. The method of measurement and the method of calculating the value of only the flash light by calculation have already been discussed in detail in Vt Publication No. 55-10569, so a detailed explanation will be omitted here. In step 33 above, set mode switch h'NO
If it is set to N or C, the process advances to step 37. In step 37, the setting data of the setting mode switch (SWI2) is stored in the above (RAM9).
Stores signals for blinking NON and C marks (wa). As a result, the display element (L CD
)'s NON, C mark (wa) starts blinking, indicating that the exposure meter of this example is ready to measure flash light emission? ! (hereinafter referred to as the Hikari-machiiso state). Step 5
8, output terminal (PO5), (PO6)l: Hi
Outputs the gh signal. In step 38, the timer 1 for measuring the time in the light waiting state is reset,
Start measuring this time. In step 39, the input terminal (INTA) of the microcomputer (CPU) is
) and (INTB) are input, and interrupt operations caused by the overflow of internal timer 0 are permitted. In step 40, the time in the light standby state is measured. While repeating this step 40, the input terminal (INT)
When a High signal is input to A), that is, when the optical trigger detection circuit (C4) detects that the flash light is emitted, the process advances to step 36 and the C0
The series of measurement operations described when set to RD is performed. During the Hikari-machiiso state in step 40, from (SW2) to (
When any key (SWII) is turned on, a high signal is input to the input terminal (INTB), and the program jumps to step 30. Also, step 40
When in Hikari-machiiso state, internal timer 〇 exceeds 70
-, the program jumps to the address determined by the interrupt operation and executes the program, but at that time timer 1 is incremented by one count and returns.

As a result, when the optical standby state continues for a certain period of time, the process proceeds to step 41, and 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. Further, the data to be calculated is determined as explained in step 32, and if the data is of rank 7, that is, if no measurement has been performed, the display element (LCD) corresponding to the data is determined. Display in J is 0
The data for displaying R is stored in the RAM corresponding to the data to be calculated. When the NON and C marks (wa) change from blinking to lit, it can be recognized that the light standby state has been released. 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 proceeds to step 43, and the above T
IME/FN.

The switch (SW13) selects TIME and SI
NGLE/MULT1 switch (SW14)ffMU
If L T 1 is selected, the process advances to step 44 and the next calculation is performed.

DATA1 0AT81 + 20^MIII
RAM, ) DATA 1 =
lol? z 2 DATA”
-(2) WDAT^1=DATA 1
- (2) '2 DATA2
: 2D8T^2 + 2 DFLASIIR8M
to (3) DATA2=10g22[l
ATΔ2−(4)WDATA2=DΔT^2
-□ (4)'D shown in equation (1)
ATAl is the integrated value of the measured values of the steady light, and DATA2 in equation (3) indicates the integrated value of the measured values of only the flash light.

If 0 is input for DATAI and DATA2 in the song for which integral measurement is to be performed, and in the calculation of equations (1) and (3), if the exponent of 2 is O in the terms of the two powers, this case is determined. A special calculation is performed in which 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 82 calculation count MULTINO is incremented by one count. If you do not jump to step 44 above, DAT
^1 = DAMBrRAM - (5) To D^2 = D
Perform the substitution FIASIIRAM-(8). DAMB I R in formula (1) (3) (5) (6)
AM is AMBIRAM! : Indicates stored data, and DF I ASHRAM indicates data stored in FLAS HRAM M.

The display data in the figure is WDATAI and WDATA.
2, and the display data address is WDATA1.
This shows the RAM in which the data of WDATA2 and WDATA2 are to be stored. After the above calculations are completed, exposure calculation is performed in step 46, and the calculated data is displayed on the display element (LCD) in the next 47 steps. When step 47 starts from step 32, the display corresponding to the data to be calculated becomes blank, and it becomes clear from the display what was calculated and displayed by the measurement. In step 48, the setting mode switch (S
W12) is selected as NON, C,
If NON or C is selected, the process jumps to step 37, and the measurement loop when the setting mode is NON or C is repeated again, and a light standby state is entered.

If NON or C is not selected in step 48 above, the measurement button (SW2) is set to ○FF in step 49.
After confirming that the display is blank, the timer 2 that measures the time until the entire display becomes blank is reset in step 50, and a new measurement of the time until the entire display becomes blank is started. In step 51, the output terminal (P
O5).

(P O6) to High and from the above (SW2) to (
A high signal is input to the input terminal (rNTB) when any of the switches (SWll) becomes ONI. In step 52, interrupts at the input terminal (INTB) and interrupts due to internal timer 0 over 70- are permitted, and in step 53 the program is temporarily stopped.

In step 31 of Fig. 6-1, if it is determined that the measurement button (SW2) is not turned on, the process jumps to step A of Fig. 6-2, and the up key (SW3) is
) is ON or not, check the above key matrix 1 (
The determination is made by supplying a strobe signal to KM 1 ). If the up key (SW3) is ON, jump to step 61 and press the T IME/FN,
It is determined whether the switch (SW13) has selected TIME or FN, and if TIME has been selected, the process advances to step 64. In step 64, T is determined from the display range of the shutter speed of the exposure meter of this embodiment.
The VMAX value and the value TV corresponding to the set shutter speed are compared, and if they are equal, the process jumps to step 72 without performing any operation. In step 64, the TV
, and the TVMAX value are not equal, then the TV
The value always indicates a value smaller than the TVMAX value. At this time, the process advances to step 65 and the TV is displayed. Increment the value by 1 count. In the exposure meter of this embodiment, this means that the shutter speed is ITV shifted to the high speed side.

TV here. represents the base 2 logarithm of the reciprocal of the shutter speed. The process then proceeds to step 72. TIME/FN in step 61 above.

If the switch (SW13) has selected FN, in step 62, the AVMAX value determined from the display range of the aperture value of the exposure meter of this embodiment and the value AV corresponding to the set FN value. o are compared, and if they are equal, the process moves to step 72 without performing any operation. Step 6
2, if the A V o value and the AV MAX value are not equal,
At this time, the AV value always indicates a value smaller than the AVMAX value.

At this time, proceed to step 631 and increment the AV value by one count. In the light meter in this embodiment, this means that the FNo value is shifted in the direction of narrowing down the aperture by one step. Thereafter, the process proceeds to step 72, where the modified TV. value or AV, an exposure calculation on the value is performed,
Display corresponding to the calculated data or the changed TV, value or AV0 value is executed in step 73. In step 74, the up key (SW3), the grand key (S
After confirming that W 4 ) is turned off, the process jumps to step E, that is, step 50 described above, and after performing the post-processing operation, it is temporarily stopped. In step 60, if the up key (SW3) is not turned on, the process jumps to step 66, and in the same manner as in step 60, it is determined whether the grand key (SW4) is turned on. If the grand key (SW4) is ON, the process advances to step 67, and it is determined whether the TIME/FN switch (SW13) has selected TIME or FN via the key matrix 2 (KM2). If TIME is selected, jump to step 70. In step 70, the TVMIN value determined from the display range of the shutter speed of the exposure meter of this embodiment,
It is compared with the set TV value, and if they are equal, the process proceeds to step 72 without taking any action. In step 70 above,
If the TV value and TVMIN value are not equal, then the TV
The value is always greater than the TVMIN value, and in step 71 the TV value is decremented by 1 count. In the exposure meter of this embodiment, this means that the shutter speed is ITV shifted in the direction of slowing down. Thereafter, the process proceeds to step 72. If the TIME/FN switch (SW13) has selected FN in step 67 above,
Proceeding to step 68, the FN of the exposure meter of this embodiment is determined.

The AVMIN value determined from the value display range is compared with the set AV value, and if they are equal, the process proceeds 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 FNo value is shifted by one step to the open side. Thereafter, the process proceeds to step 72, and the operations described above are executed after step 72, and the system enters a temporary stop state.

If the grand key (SW4) is not turned on at step 66, the process jumps 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 7 to step 81. In step 81, it is determined whether the value of MN indicating the number of memory keys is 2, and if biN is 2, that is, if 2 pieces of data have already been stored in memory, the process jumps to step 82. Step 8 above
In step 2, 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. , E stores the value corresponding to the display. Thereafter, the process proceeds to step 92. In step 81, if MN is not 2, the process jumps to step 83 and MN is incremented by one count. Next, in step 84, it is determined whether MN is 2, and if MN is 2, the process proceeds to step 85. This time indicates that the memory key (SWS) has been turned on in order to perform a second memory while one memory has already been stored. In step 85, the values of DATA1 and DATA2 obtained by the measurement are stored in the RAM where the second memory is to be stored. Step 86 indicates that the second memory has been executed. In order to light up the memory timer 22, the MN data is stored in (RAMIO) for display. As a result, the memory mark (shi) in the display element (LCD) lights up. At this time, the first memory has already been executed, so at this time, memory mark 1
(evening) and memory mark 2 (shi) both light up. In step 84 above, if MN is not 2, that is,
If the memory key (SWS) is turned on without any memory being stored, step 87
Proceed to DATA 1 and DA obtained by measurement.
Set the value of TA2 to RA where the first memory should be stored.
Store in M. Step 88 stores the data of MN in (RAMIO) in order to light up memory mark 1 (evening) indicating that the first memory has been executed. Steps 86 and 88 proceed to steps 89 and 90 to perform exposure calculation corresponding to the final measured value, display the value calculated in step 91 on the display element (LCD), and in step 92 press the memory key (LCD). After confirming that the recall key (SW6) and the recall key (SW6) are turned off, the process jumps to step E, executes the above-described post-processing operation, and then pauses. If the memory key (SWS) is not turned on in step 80 above, step 93
The process jumps to step 94, and it is determined whether the recall key (SW6) is turned on via the key matrix 1 (KMI), and if it is turned on, the process jumps to step 94; if it is not turned on, the process jumps to step 94. , jump to step C. In step 94, the output terminal (PO2)
By outputting a High signal to the display element (L
The display lighting member (LEDI) installed on the back side of the CD
) lights up.

In step 95, the H key (SWS), the S key (SWS)
), the flag SL (F) indicating whether the exposure calculation executed by turning on the FIX key (SWIO) is 0 is determined, and if it is not 0, that is, the above (SWS), ( If an exposure calculation is being executed using either the SWS) or (SWI O) key, in order to cancel this operation, SHF is set to O in step 96, and H in the display element (LCD) is set to O in step 97. Mark (ne), S
In order to turn off the marks (U) and F (su), SHF data is stored in the above (RAM?). As a result, the exposure calculations by (SWS), (SWS), and (SWI O) described above are canceled, and the exposure calculation jumps to 18 stages.
Exposure calculation for the final measured value and its display are performed.

If SHF is 0 in step 95 above, that is, (SWS
), (SWS), and (SWI O), in step 98, the display element (L
Determine whether all segments of CD) are turned off. The exposure meter of this example has a range from (SW2) to (SWII
) for a certain period of time, specifically, for example, 4.
If the exposure is not performed every minute, the display is automatically turned off, and in this state the light meter of this embodiment is activated by turning on the recall key (SW6). If it is determined in step 98 that all displays are off, the process jumps to step 89, where the exposure calculation of the final measured value, calculation data, and setting data are displayed, and the exposure meter of this embodiment is activated. .

If all the displays are not in the off state in step 98, the process jumps to step 99, and it is determined whether the display corresponding to the calculated data as shown in Table 1 is E. This is to cancel the E display that is executed when the memory key (SW5) is turned ON with two memories already stored. If it is determined in step 99 that the display is E, the process jumps to step 8 and the exposure calculation and display of the final measured value are executed. If it is determined in step 9 that E is not displayed, it is determined in step 100 whether the memory to be called is the first memory or the 28th memory. RN is 1
When g is 1, the first memory is called, and when g is 2, the second memory is called. In step 100, if RN is 2, jump to step 101 and set RN to 1. Due to this and the operation in step 104, memory recall by turning on the recall key (SW6) is 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 (RAM 16), so that memory mark 2 (shi) starts blinking. . In steps 103 and 107, exposure calculations are performed on the data stored in the second memory, and the calculated data is displayed in step 108.

If the data stored in the first memory or the second memory is not stored, 0 data is stored in the RAM where the first memory or the second memory is stored, and in this case, The display now shows 0, indicating that no data is stored in the first or second memory that was called. 0 is stored in the RAM that stores the th memory. In step 109, press the recall key (S).
Step 109 is repeated until W6) is turned OFF, and then the next step is performed.The memory recall function of the light meter in this embodiment is enabled only when the recall key (SW6) is turned ON, and when it is turned OFF. Then, the display will correspond 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 RAM 16, 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 recalled is the first memory, the process jumps to step 104, sets RN to 2, and displays the display element (L) corresponding to the first memory to be recalled in step 105.
A signal for blinking memory mark 1 (evening) of the CD is stored in the RAM 16. As a result, the memory mark 1 (evening) starts blinking. 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 of FIG. 6-4. In step 120, press the memory clear key (SW7)
The above 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, MN indicating the number stored in memory is
is set to O, and in step 122, the first memory and the second memory are
Data O is stored in the RAM that stores the th memory. In step 123, SHF is set to 0, and in step 124, MN data is input to (RAMIO) as a signal to turn off memory mark 1 (ri) and memory mark 2 (shi) of the display element (LCD). The SHF data is stored in the RAM 7 as a signal for turning off the SHF marks (U), (S), and (N). By turning on the memory clear key (SW7), exposure calculations by the H key (SW8), S key (SW9), and FIX key (SW10) are canceled. Step 1
At steps 25 and 126, exposure calculation is performed using the data of the final measurement value, and at step 127, it is displayed. At step 128,
After confirming that the memory clear key (SW7) is turned off, the process moves to step E, and after the post-processing operation is executed, the process is temporarily stopped.

In steps 129, 130, 131, press the H key (SWS)
, S key (SWS), and FIX key (SWIO) are turned on.
S) is ONt, SHF is set to 1 in step 132, and SHF is set to (RAM?) in step 133.
By storing data, H in the display element (LCD)
The mark (ne) lights up. When the S key (SWS) is ON, SHF is set to 2 in step 134, and SHF data is stored in (RAM7) in step 135, thereby displaying the S mark (U) in the display element (LCD). lights up. If the FIX key (SWIO) is ONL, SHF is set to 3 in step 136, and step 13
By storing the SHF data in (RAM?) in step 7, the F mark in the display element (LCD) lights up.

In step 138, the measured value data is
By turning on the exposure value, the FIX meme memory must be stored in order to keep it fixed on the display as an exposure value. RAM
Store measured value data in . In the exposure calculation at step 139, the arithmetic processing to be executed due to (SW 8 )t(SWS) and (SWI O) being turned on is executed, and the calculated value is displayed at step 140.

In step 141, the H key (SWS), the S key (SWS)
), confirm that the FIX key (SWIO) is turned off, and jump to step E. This performs post-processing operations and then the program pauses.

In steps 129, 130, 131 above, the H key (SW
S), S key (SWS), FIX key (SWIO) are O
If it is determined that it is not N, the process jumps to step D in FIG.
Determine whether the ESET key (SWII) is ONL. If it is ON, proceed to step 151;
If it is not turned on, the process jumps to step E and continues with the post-processing and temporary stop programs without performing any operations.

In step 151, the setting of the 5INGLE/MULTI switch (SWI4) is determined, and the MU
If LTI is selected, proceed to step 152;
If 5INGLE, jump to step E. The above MULTI RESET key (SWII) is the same as the above S
INGLE/MULT I switch (SWI4) is M
This is valid only at ULTI. In step 152, MULT INo indicating the number of integrations is set to 0,
In step 153, DATAI and DATA2 indicating the accumulated measurement values are set to 0. In step 154, G.V.
, the MULT I No display is 0, and the data to be calculated when (SWI4) in Table 1 selects MULTI; in this case, the FNo value display is 0. The display element now indicates that a new integration measurement can be started.

FIG. 7 is a flowchart showing a program executed by an interrupt generated when the internal timer O 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 1 count, and in step 208 timer 1 is incremented by 1 count. The timer 1 is used to measure the time in the light standby state when the setting mode switch (SWI2) is set to NON or C. In step 202, it is determined whether the value of timer 2 calculated in step 201 is greater than a preset value T2. In the case of the light meter of this embodiment,
For example, the value of T2 is set so that the data of timer 2 becomes greater than T2 when 8 seconds have elapsed.

In step 202, if the timer 2 is greater than T2, a Low signal is output to the output terminal (PO4) to turn off the display lighting member. In step 204, it is determined whether the value of timer 2 is greater than a preset value T.

In the case of the light meter of this embodiment, for example, when 4 minutes have elapsed, the timer 2 will start! so that T is larger than
The value of T is set. When timer 2 becomes larger than T3, the process jumps to step 215, and the data for turning off all the displays on the display element (LCD) is stored in (RAM).
I) to (RAMI6) and display element (L C
D) Turn off all displays.

In step 216, a Low signal is supplied to the output layer (pos) and a High signal is supplied to (POS).

In step 217, the input terminal (INTB) is set to High.
When the signal is input, only the interrupt that occurs is permitted, and in step 218, the timer 2 is set to O and the program is temporarily stopped. As a result, the recall key (SW6
), the only way to restart a program that has been stopped in this state is to press the recall key (SW6) ONL.

In other words, even if the key is inadvertently turned on, no action is executed. In step 204, if timer 2 is smaller than T, the setting mode switch (SWI2) is determined in step 205, and compared with the previous state, if there is a change in the setting of this (SWI2). In step 206, (SWI2) setting data f(
By storing it in RAM9), A M B I * C
ORD -N ON, Cv -9 (J), (force),
(iv) Change the display. Setting mode switch (S
If there is a change in the settings of WI2), step 207
Then, the settings of TIME/FN and the switch (SWI3) are determined, and if there is a change from the previous state, the data of the above (SWI3) is stored in (RAM6) in step 208, and the display element (L CD ) will be changed.

If there is no change in the above (SWI3) setting, the 5INGLE/MULTI switch (SWI4) setting is determined in step 209, and if there is a change from the previous state, in step 210, the display element (L CD ) inside M
ULT 11'y-p-9('), GVv-ku(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
) to enable interrupts due to Hi[rh signal input and interrupts due to timer 0 over 70-, and then return 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 (SWI 2)
, (SWI 3), or (SWI 4), step 2 is performed after each display operation.
Proceed to step 11, and after the changes described in Table 1 (SW 12 ),
Data such that the display corresponding to the data to be calculated according to the settings of (SW 13 ) and (SW 14 ′) becomes 0 is stored from (RAMI) to (RAM5).

The program then proceeds to step 212, which causes the static switches (SWI 2), (S
WI 3) and (SWI 4) are checked every time there is an interrupt caused by the internal timer 〇 over 70-.

Figures 8-1 and 8-2 show the INTB shown in Figure 6.
This is a 70-chart showing the exposure calculation in the 70-chart.

At step 300 (SW8), (SW9).

(SWIO) is turned ON, it is determined whether the set SHF is 0. If it is not 0, that is, (SW8), (SW9).

If the exposure calculation by turning on (SWIO) is performed or has already been performed, jump to step 308,
If it is 0, proceed to step 301. In step 301, T
IME/FN, switch (SWI3) is determined, and if TIME is selected, step 304
Jump to and display data i.e. WDATAI, WD
Perform AV calculation to calculate AV value using ATA2,
At this time, the calculation A is performed as shown below.

AMBI =lllDAT^1- TVo
, (7) FL^I=HDAT^2 +cv, -(8)
2^VIO= 2^MB1+2FL^'-(9)AVI
OAVIO=logz2-(10)AV,
= AVIO + SV, - (11) In equation (7), WDATAI is the BV value of the steady light at a shutter speed of 1 second, and Tvo is the base 2 pair of the reciprocal of the set or calculated shutter speed. It is a numerical value. WDATA2 in equation (8) indicates the BV value of only the flash light. SV, is I set externally
This is the BV value of SO sensitivity. These calculations have already been discussed in detail in Japanese Unexamined Patent Publication No. 55-10569, so the details will be omitted here.

However, GV in equation (8). is a value indicating how many steps brighter or darker the flash light should be made, and 0 is normally input. Furthermore, when WDATA2 indicates 0 in equation (8), that is, when there is no 7 Lassie light, GV,
Whatever the value, the calculation is performed so that FLA 1 becomes 0. In the calculation of equation (9), the term indicating the power of 2 is
If the antilog of the term is O, the term is calculated to be 0.

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, give a signal that causes the FN and mark to blink to (RAM14) and set the OVF.1 On the other hand, when it is smaller than the display range, give a signal that causes the FN and mark to blink to (RAM14). and set the UDF. Of course, in the display range, OVF,
UDF is reset. If FN is selected in step 301, 5INGL is selected in step 302.
Determine the state of the E/MULTI switch (SW14) and if MULTI is selected, proceed to step 3.
Exposure number calculation in step 07 calculates the number of exposures required to satisfy the already set shutter speed, FN, and value. Therefore, the following calculations are performed.

AVIO=AV, -SV, -(
12) AMBI=lD^TAI-TV,
-(13) FLAI=HD^T^2
− (14) M[1LTINO= INT (
MULTINO' ) - (1B) MULTIN
O' 5HLILTINOsub HaMULTINO=N
ULTINO+1VIO 2= (14ULTINo)X (2^NB1+2FL
^') -(17) AVIO= Iogt 2^V
IO (1g) AV, = AVIO+ svo
-(19) In formula (12), AV.

is the AV value corresponding to the set FN value. (1
The brightness of the stationary light at the shutter speed set by equation 3) is calculated, and equation (14) is simply a substitution. (15
The denominator of the equation ) is the linear amount of light brightness that is a combination of steady light and flash light obtained in one exposure at a set shutter speed. Therefore, the FN is set using equation (15). MULT number of exposures for shooting with value
I NO' is calculated. However, since MULTINo' is a value that includes a decimal and the number of exposures is an integer, (1
6) MULTI only the integer part of MULT INO' in the formula
Define NO. Here MULTINO' and MULT
If I No is a ratio, that is, if the decimal part of MULTINO' is O, it should be displayed! IF No value is set AV. This is the F No value corresponding to the * value. However, MULT I NO' and MULT
If INo is not equal, then for MULT INO exposures, AV. The exposure would be insufficient to take a picture with the FN and value corresponding to . Therefore, by increasing MULT INo by one time,
(17), (18).

Equation (19) is executed to calculate and display the AV value for MULT I No exposures. In other words,
The set F No value will be displayed with a fraction attached. At this time, if MULT I No is less than 1, the signal for the MULTI mark to blink is
It is added to the off signal of the MULT INo display, and (RAM
4). At the same time, set the OVF in case the measurement light is too bright. MULTINO is 10
When the value is above, a signal for making the MULT I mark blink is added to the light-off signal of the MULT I No display and stored in (RAM4), and the UDF is set to mean that the measurement light is too dark. Of course, MULTIN
O is reset from 1 to 9t'Afllr, OVF, UDFlt.

In step 302, if (SW14) is selected as SIN0LE, the process proceeds to step 303, and the setting state of the setting mode switch (SW12) is determined. Here, if AMBI is selected, the process jumps to step 305; otherwise, the process jumps to step 306.

In step 305, the set FN.

A shutter speed that satisfies the value is calculated.

AV10=AV, -SV, -(20)TV,
= NDATAI -AVIO- (21) (20), (
21) Expression is a general apex operation.

WDATAI indicates the brightness of stationary 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. If the shutter speed exceeds the display range of the exposure meter of this embodiment, a signal for blinking the TIME mark is set in (RAM 13) and the OVF is turned off because the measurement light is too bright. Conversely, when indicating a slow shutter that is below the display range, a signal that blinks the TIME mark is sent (RAM1
3) and also set the UDF because the measurement light is too dark.Within the 0 display range, the OVF, UD
F is reset. At this time, GV, MULT IN
(RAM4) and (RAM5) are set so that the o display is turned off.

In step 306, the set shutter speed and FN are
, the level of flash light necessary to obtain proper exposure is calculated and displayed as a value called GV by how many steps should be increased or decreased relative to the measured flash light.

AV10=AV, -SV, -(20)TVI
=NDATAI-AVIO-(21)TV, ≧T
V6 now 1fTV, = TV1 + 1 - (23) TVO other than that = TVO - (24) ^V20 = NDATAI - TV, - (2
5) 2^V30 yo 2^VIO-^V20 (26)
^V30 ^V30 = Iogz 2
(27) cv,' = 8V30 − NDA
TAI2 − (2B>GV, = INT
(GV,' ) - (29) to Vo'F'G
Vo Ka GVo ≧ 0 Nara If (: Vo = GVo + 1 other than V, = GV, - (31) AI4B1
= [1ATA1 − TV, −(32)F
LAI = DATA12 +GV, -(33)AV
lo AMBL + 2 FLAI
(34) 2=2 ^v1 AVIO= log 2 - (35)
8v0 = ^vto ten sv,
-(36) The above are the calculation contents in this step. (
20).

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, it will be overexposed with just the constant light, so 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. The brightness of the stationary light is subtracted from the linearly set value using equations (25) and (26) to calculate the amount of light required for flash light, and this is 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, this GV. It is sufficient to display the value, but in the light meter of this example, the G value is displayed.
Since the V value is displayed in one step pitch, (29), (30)
, is corrected using equation (31). In equation (29), GV
Let the integer of o' be Gvo, and if GVo'a>the decimal part is not 0, then according to the formula, GV. ′≠GV. GV if holds true and G V o is positive. Increase the value by one step. If GV is negative, set the integer of GV o' to GV. By defining this, it becomes the same thing, so there is no need to make it one step thicker.

GVo'=GV. When , the decimal part of GV,' is 0, so GV can be up to *.

(32), (33), (34), (35), (
36) Equation is the same as the calculation in step 304, and GV
. This is to calculate the fraction of the set FN and value after calculating . If this GVo is larger than the display range, the GV and MULT I NO displays will be blank, and the (RAMP) signal will be displayed with the GV mark (nu) blinking.
At the same time, because the measurement light was too dark,
Set DF. GV is smaller than the display range'! 'u'
i+l: C, GV, MULT INo display (chi) will be blank, and the GV mark will flash (RAM)
5) and set the OVF because the measurement light is too bright.6 If it is within the display range, set the OVF.
F, UDF is reset. At this time (RAM4), MULT I and Rama-1 (+7) are turned off, and MULT
Data for not displaying T I No data is stored.

By setting OVF and UDF like this, over
When v-ri (tsu) flashes, press the up key (SW3) to unde
When the r mark (n) is blinking, turn on the down key (SW4) and the appropriate value will be displayed.

In step 308, step 3
04 is performed, and in step 309, 1
If the 2nd memory is stored, AV calculation is performed for the 1st memory.
If the second memory is stored, AV calculation is performed on the second memory, and in step 311 the FIX
By turning on the key (SWlo), FIX/
If data is already stored in the memory, AV calculation is performed for the 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.
It is carried out as

Next, proceed to step F of FIG. 8-2, and step 312
It is determined whether SHF is 0 or not, and if it is 0, that is, (S
If the operation that is executed by turning on any of the keys W8), (SW9), and (SWI O) is not performed,
The process proceeds 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 first memory, the deviation from AV2 by the first memory, and in step 315, if there is a second memory, the deviation from AV by the second memory. ΔAll respectively
ΔA2. It is calculated as ΔA3. This ΔA11ΔA
2? ΔA displays analog dots (RA
MII), and an analog dot lights up as a deviation from the digital value.

In step 312, if SHF is not O, step 3
In step 16, it is determined whether it is 1, and if it is 1, the process jumps to step 317. Here, it is determined whether 2 memories are used by MN indicating the number of memories, and 2
If the size of the two memories is stored in the memory, Stella 1318 determines the size of the two memories, and if the second memory is large, in step 319, a predetermined value is determined from the A V s from the second memory. BIASH
Subtract the value. Now, B I ASH only FN,
The value indicates the open state.

In step 318 above, if the first memory is larger, in step 320, from the first memory to B
Subtract I ASH. If it is determined in step 317 that two memories are not included, step 321
Determine whether one memory is included. 1
If there are memories of i, execute the operation of step 320;
In steps 322 and 323, the final measured value is stored as the first memory. In step 324, the AV for the final measurement value is assigned to AV2, and in step 325,
Let MN be 1. Thereafter, 320 steps of calculation are performed. If SHF is not 1 in step 316, it is determined in step 326 whether it is 2, and if so, the process jumps to step 327. Steps 327 to 335 are different from steps 317 to 325 in step 3.
At step 30, a predetermined value BrASS is added to AV2 from the first memory, which is smaller than the second memory, and at step 329, a predetermined value BrASS is added to AV3 from the second memory, which is smaller than the first memory. As
The explanation of the other steps, which differ only in that s is added, will be omitted because they are the same as steps 317 to 325*.

If SHF is not 2 in step 326, SHF is 3, so AV from the FIX memory is replaced with AV in step 336. Step 316
By executing 329 from above, the above H key (SW8
), a constant value (B
By instructing FN by IASH), FN, and the position display (D), the calculated value is displayed and fixed by the specified value.

In addition, by turning on the S key (SW9), a value that is a certain value (BIASS) is added to the darker value of the memorized values or the final measured value. By instructing the FN and position display (wo), an instruction value for underexposing the calculated value by a certain amount is displayed and fixed.

Mata, turn FI)l-(SWI O) ON. : and $
, :! Then, the measured value is fixed to the digital display, specifically the FN value. Subsequent measured values are not displayed on the digital display, but are displayed on the analog dot as ΔA1 in step 313 as a deviation from the analog index 0. In other words, the analog dot on the analog index θ is A
V. The analog decoder (DC7) is configured so that the value corresponding to the value is always expressed as a dot. The first memory also has a digital display (FN,
ΔA2 is the deviation from the AV corresponding to the analog index 0, and is displayed as a dot on the analog dot as the deviation from the analog index 0. Similarly, the second memory is ΔA as the deviation from A Vo corresponding to the digital display (FN, digit display), which is displayed as a dot on the analog dot as the deviation from the analog finger fIIO.

In the above embodiment, the H key (SW8), the S key (
By turning on SW9) and the FIX key (SWlo), the calculated value is fixed on the digital display, and subsequent measured values are displayed on the analog dot as a deviation from the digitally displayed value. Ru. As a result, each point in the subject when the value calculated by turning on the H key (SW8), S key (SW9), and FIX key (SWI O) is fixed as the camera's exposure value. What is the relationship between the measured values at You can understand what will happen 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, thereby making it possible to recognize which memory is currently being recalled.

Press the MULTI RESET key (SWII)
MULTI of GLE/MULTI switch (SWI4)
By providing it outside the position, it becomes possible to construct a lightweight device that is composed of two switches into one switch member.

By turning on the recall key (SW6), the data held in the microcomputer (CPU) is
Since it cannot be destroyed or changed, the display lighting member (L E
The recall key (SW6) can also be used as a starting switch for lighting up the switch D).

In this embodiment, when a measurement is made, only the digital display that is displayed as the measured value becomes blank for an instant.
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 embodiment, by entering the light standby state once, the measurement is updated every time the flash light enters the exposure meter of this embodiment within a certain period of time. There is no need to enter the light standby state by pressing the measurement button or the like for each measurement.

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

In addition, in this example, when the shutter speed, FN, and value are set in advance and a photograph is taken with this combination of exposures, the calculation to calculate the brightness of the flash light necessary to give the appropriate exposure is performed. programmed. Up until now, when shooting using a flash with a fixed FN value due to depth of field, etc., it was possible to reach the required FN0 value by repeatedly measuring while changing the light intensity of the flash. However, with the exposure 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 a calculation for calculating the number of exposures required to obtain appropriate exposure using a preset shutter speed and FN0 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, memory mark 1 (ri) and memory mark 2 (shi) are represented by the numbers "1" and "2", respectively.
In addition, in step 86 in the 70-chart of FIG. 6-3, "memory mark 2, light off" and "memory mark 1 light off" may be performed. This allows the number of stored photometric values to be displayed numerically. In this case, the mark (number) corresponding to the recalled memory value may be blinked as in step 105 or 106 in Figure 6-3, but only the numbers corresponding to the recalled memory value are displayed continuously. Furthermore, the number of stored items may be displayed using a 7-segment display, or the number of stored items may be three or more.

(Left below) Issue 1! 1. As detailed above, the flash light measurement device according to the present invention includes a photometer for measuring flash light and, upon detecting the start of flash light emission, outputs a light trigger signal for operating the photometer. and a control means that controls both the photometry means and the light trigger means to be in an active state or both to be in an inactive state. By configuring in this way,
When the flash device and the flash light measuring device are arranged relatively close to each other so that the measurement results of the flash light measuring device can be read from the position of the flash device, the control means can control both the photometering means and the light triggering means. By controlling the operating state, it is possible to repeatedly measure the flash light without having to operate the manual operation switch of the flash light measurement device every time you make a measurement. Flash light measurements can be easily and repeatedly performed by a single operator of the fl.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention.
The figure is a block diagram showing the overall configuration, Figure 2 (a) is an exterior front view, Figure 2 (b) is an exterior side view, Figure 3 is an explanatory diagram showing the display, and Figure #S4 is a block diagram showing the display section. 5 to 8 are 70-charts showing the processing procedure. (C1): Photometric means, (C4): Optical trigger means, (c p u ): Control means. Applicant: Minolta Camera Co., Ltd. Figure 6-4 Figure B-f

Claims (1)

[Scope of Claims] 1. Photometering means for measuring flash light; Light trigger means for outputting a light trigger signal for operating the light metering means upon detecting the start of emission of flash light; Photometry means and light trigger means 1. A flash light measurement device comprising: control means for controlling both of the above to be in an active state or both to be in an inactive state. 2.Furthermore, a first display that displays according to the photometry result of the photometry means.
2. A flash light measuring device according to claim 1, further comprising: a display means; and a second display means for displaying a display according to a control state of the control means. 3. The control means includes a first manual operation member that can be manually operated, and a timer means for counting a predetermined time from the operation of the manual operation member, and the photometry means and the light trigger means are activated only during the counting time of the timer means. 2. The flash light measuring device according to claim 1, wherein the flash light measuring device is configured to control both of the flash light measuring device into an operating state. 4. The photometry means outputs a measurement operation end signal when the measurement operation ends, and the timer means is configured so that the count is reset by this measurement operation end signal. The flash light measuring device described. 5. The flash light according to claim 1, wherein the control means has a second manual operation member that is manually operated to control both the photometry means and the light trigger means to an inoperable state. measuring device.