JPH0715548B2 - Display device for flash measurement - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a photometric device for flash photography. More specifically, the present invention relates to a display device capable of simultaneously displaying measured flash light and stationary light on a predetermined scale.

2. Description of the Related Art A conventional photometric device for flash photography is, for example, as disclosed in the specification of U.S. Pat. The proper aperture value corresponding to the photometric data of the sensor selected by input is digitally displayed.
However, in this case, since the aperture values of a plurality of points are simply displayed as digital numbers at the same time, the contrast distribution cannot be recognized at a glance, and
There is a problem that it is difficult to perceptually recognize the contrast.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a display device that displays the difference in the contribution of flash light and ambient light at the time of shooting so that the difference can be sensuously recognized at a glance. is there.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a first photometric means for measuring flash light emitted prior to photographing and outputting a photometric value relating to the flash light, and the flash light amount. Second photometric means for measuring the ambient light that is not affected by the above, and outputting the photometric value for the ambient light, and first storage means for storing the photometric value for the flash light output from the first photometric means. A second storage means for storing a photometric value relating to the ambient light output from the second photometric means, a linear scale on which the photometric value is displayed, and the first and second storage means. Display means for displaying the amount of difference between the photometric values as a distance by simultaneously displaying the measured photometric values at corresponding positions on the scale.

Action With the above configuration, the difference in contribution between the flash light and the stationary light at the time of shooting is displayed as a distance on the scale.

Example One example of the present invention will be described below.

FIG. 1 shows a schematic configuration of a photometric device of the present invention, and FIGS. 2 (a), (b), and (c) show photometry when subject light is measured using the photometric device shown in FIG. The quantities are shown diagrammatically. The photometry is performed at three locations on the subject. As shown in FIG. 3, the position is a relatively dark portion of the main subject, the position is a relatively bright portion of the main subject, and the position is a relatively bright background. 2A shows the position photometric amount, FIG. 2B shows the position photometric amount, and FIG. 2C shows the position photometric amount.

In FIG. 1, a light receiving section (a) is for performing incident light type photometry of the subject light, and is composed of a photoelectric conversion element placed behind a diffused transmission window (not shown). Then, if the photometric point of the subject is, for example, a position, the light receiving section (a) is placed at the position of the subject and measurement is performed. The integration calculation unit (b) integrates the photometric signal from the light receiving unit (a) for the time t ₁ when the flash light is emitted, and obtains the sum F ₁ of the flash light amount and the steady light amount during this time t ₁ . The integration calculation unit (b) continues to display the time when the flash is not fired.
t ₂ only integrates the output of the light receiving portion (A), obtaining a constant amount of light A ₁ during the time t _2. Then, the data of the constant light amount A ₁ is stored in the constant light memory I (c). On the other hand, the integration calculation unit (b) calculates F ₁ −A ₁ × t ₁ / t ₂ to obtain the flash light amount F ′, and the data of the flash light amount F ₁ ′ is stored in the flash light amount memory I (d). Memorized in.

The exposure time setting unit (e) sets the exposure time T. The exposure amount calculation unit I (f) is used for the exposure time T and the stationary light memory I.
The exposure amount E ₁ due to the stationary light is calculated by the calculation of A ₁ × T / t ₂ from the stationary light amount A ₁ from (c) and the time t _2, and the flash light amount F ₁ from the flash light amount memory I (d) is calculated. By calculating F ₁ ′ + E ₁ from ′ ′ and this exposure amount E ₁ , the appropriate exposure amount at the position of the subject when the flash is fired and shooting is performed for the exposure time T is calculated.

Next, when the light receiving unit (a) is placed at the second position of the subject and the measurement is performed, the integration calculation unit (b) determines that the flash light amount and the steady light amount during the time t ₁ are the same as the above. Then, the sum F ₂ is calculated, and then the stationary light quantity A ₂ during the time t ₂ is calculated. The data of the stationary light amount A ₂ is stored in the stationary light memory II (g). In addition, F ₂ −A ₂ × t ₁ / t ₂
The flash light intensity F ₂ ′ is obtained by the calculation of, and the data of the flash light intensity F ₂ is used as the flash light intensity memory II (h).
Memorized in. Then, the exposure amount calculation unit II (i) calculates the exposure time T from the exposure time setting unit (e) and the stationary light memory II.
The exposure amount E ₂ due to the stationary light is calculated by the calculation of A ₂ × T / t ₂ from the stationary light amount A ₂ from (g) and the time t _2, and the flash light amount F ₂ from the flash light amount memory II (h) By calculating F ₂ ′ + E ₂ from ′ ′ and this exposure amount E ₂ , an appropriate exposure amount is calculated at the position of the subject when the flash is fired and shooting is performed for the exposure time T.

The photometry of the subject light at the third position of the subject is also performed by the same method as described above. The data of the constant light amount A ₃ is stored in the constant light memory III (nu), and the flash light amount memory II
Data of the flash light amount F ₃ ′ is stored in I (l).
Then, the exposure amount calculation unit III (o)
₃ is calculated, and the flash light amount F ₃ ′ from the flash light amount memory III (L) and this exposure amount E ₃ are used to calculate F ₃ ′ + E ₃ The appropriate exposure amount at the position is calculated.

In the above example, the first position of the subject is a relatively dark part of the near main subject, and as shown in FIG. 2, the flash light amount F ₁ ′ is large and the steady light amount A ₁ is small. Further, the second position is a relatively bright part of the near main subject, and both the flash light amount F ₂ ′ and the steady light amount A ₂ are large. In addition, the third position is a distant and bright background,
F ₃ ′ is small and the steady light amount A ₃ is large.

(W) is a display unit, and the exposure amount calculation units I, II, III (F),
Proper exposure amount F ₁ ′ + at the first position from (ri) and (wo)
Based on the data of E ₁ , the proper exposure amount F ₂ ′ + E _{2 at the second} position and the proper exposure amount F ₃ ′ + E _{3 at} the _third position, these values are analogized as position information on the same exposure amount scale. indicate. FIG. 4 shows an example of the display on the display unit (wa). The difference between the proper exposure doses of the first position and the third position with respect to the second position on the basis of the second position of the subject is shown. That is, the contrast is displayed in analog. The index (S ₁ ) corresponds to the position, the index (S ₂ ) corresponds to the reference position, and the index (S ₃ ) corresponds to the position. The positions of the indices (S ₁ ) and (S ₃ ) and the index (S ₂ ) The distances between the positions respectively indicate the position and the position and the contrast between the positions. According to this display method, it is possible to directly look at the mutual contrasts of the positions of the subject.

FIGS. 5 (a), (b), and (c) schematically show the respective proper exposure amounts at the positions when the exposure time is changed to T'shorter than T in the same subject as described above ,. Since the contribution of the stationary light to the exposure is determined by the product of the brightness of the stationary light and the exposure time, the contribution of the stationary light becomes smaller than the contribution of the flash light when the exposure time becomes short. As a result, the position of the subject and the proper exposure amount of the position change with respect to the proper exposure amount of the position when the above-described exposure time T is reached. The display on the display unit (wa) in this case is as shown in FIG.
It is quantified that the positions of the indexes (S ₁ ) and (S ₃ ) representing the proper exposure amount of are changed from the case of FIG. 4 and the contrast between the positions becomes larger than that when the exposure time is T. You can directly look at it.

In the above example, we have seen that the contrast changes by changing the exposure time while keeping the flash emission amount constant, but the relationship between the contribution of the flash light and the contribution of the stationary light to the contrast is relative. Therefore, even if the exposure time T is kept unchanged and the flash emission amount is increased, the same change in contrast as the change from the display content shown in FIG. 4 to the display content shown in FIG. 6 can be obtained. In this case, as shown by a broken line in FIG. 1, a light emission amount changing section (f) is provided, and the flash light amount memories I, II, III (d), and
The information of (h) and (l) should be changed at a constant rate.

As described above, in the present invention, when shooting is performed using auxiliary illumination by flash emission, the same subject is measured once for each part of the subject, and the flash light amount memories I, II, III and the steady light memory I are measured. After the information is stored in II, II, and III, how the contrast changes due to the change of the exposure time (and / or the flash emission amount) can be determined at a glance by the display unit. Then, after the contrast is appropriately set, desired photographing can be performed by determining an appropriate aperture value for a desired position of the subject. When the contrast is good in the state shown in FIG. 4, for example, the proper aperture value is the proper exposure amount at each of the positions ,.
It is automatically calculated by calculating the film speed data in any one of F ₁ ′ + E ₁ , F ₂ ′ + E ₂ and F ₃ ′ + E ₃ .

In the above-described embodiment, the light receiving section (a) has an incident light type measurement, but the light receiving section (a) is a photoelectric conversion element arranged in the imaging optical system and the characteristic portion of the focal plane thereof. If it is configured as a combination of, the reflected light type measurement is also possible. Further, in the case of the reflected light type measurement, if a plurality of photoelectric conversion elements are arranged in each part of the focal plane, it is possible to measure each part of the subject at once.

Further, in the above-mentioned example, for example, in order to obtain the flash light amount F ₁ ′, the calculation of F ₁ −A ₁ × t ₁ / t ₂ was performed, but in the measurement within the time t ₁ , the light receiving unit (a) If the output is integrated through a high-pass filter, the flash light amount
F ₁ ′ can be obtained directly. Although information of the constant light in the above is obtained as a constant amount of light A _1, etc., what is essentially required, because it is the brightness information of the ambient light, without integration in time t _2, the light receiving portion (Lee ) The signal strength itself may be obtained. In this case, assuming that the brightness of the stationary light (that is, the signal intensity of the light receiving unit (a) when the flash is not emitting light) is B, the exposure amount E ₁ is calculated by T × B. It goes without saying that B = A ₁ / t ₂ . Further, in the above example, the fixed time t ₁ is adopted as the integration time at the time of flash emission, but the set value T of the exposure time may be adopted as this time.

FIG. 7 shows an example of the appearance of the photometric device. Reference numeral 1 is a light receiving window, 2 is an aperture value display unit, and an appropriate aperture value corresponding to the photometric values of a plurality of points of the subject is displayed on an analog scale by a method described later. Displayed by lighting the dots on the liquid crystal. Reference numeral 3 is a digital display unit of the aperture value. 4 is a photometric start key for starting photometry, 5 is a memory key for storing the photometric data in the RAM in the CPU, 6 is a memory recall key for displaying the once stored photometric data on the display unit 3, 7 Is a memory clear key for clearing stored data, 8 is a synchro contact, 9 is an exposure time setting dial, 10 is a flash light intensity ratio setting dial that sets the ratio of the flash emission amount at the time of photometry to the flash emission amount at the time of shooting , 11 are film sensitivity setting dials. 12 is an absolute scale display / relative scale display switching static key for switching between the absolute scale display and the relative scale display on the display unit 2, and 13 is a normal display / separate display switching static key for switching the normal display / separate display on the display unit 2. Is.

Here, the absolute scale / normal display means that the proper aperture value obtained from the amount of light that contributes to the exposure and the film sensitivity during flash shooting at the set exposure time is simultaneously displayed on the absolute scale of the aperture value for multiple parts of the subject. This is a display method that is displayed in a static manner. Relative scale / normal display is the amount of light that contributes to the exposure during flash photography with the set exposure time, and the amount of light for one of multiple parts of the subject is used as the reference value for simultaneous display on the relative scale. This is the display method to display. on the other hand,
The separate display is performed for one of a plurality of parts of the subject, and for this part of the subject, an appropriate aperture value for exposure with total light, an appropriate aperture value for exposure with flash light only, and only steady light. Is a display method for simultaneously displaying each of the proper aperture values at the time of exposure. Also in this separate display, it is possible to perform an absolute scale display by the proper aperture value scale and a relative scale display by the relative scale of the light amount contributing to the exposure.

FIGS. 8A to 8D show display examples of the normal display and the separate display in the absolute scale and the relative scale, respectively. In this example, the scale F5. In the absolute scale / normal display of FIG. 8A is shown. The position of 6 and the position of the relative scale normal display OEv in FIG. 8 (b) Indicates the proper aperture value according to the photometric value currently being measured, and the digital display unit 3 digitally displays this aperture value F5.6. In the absolute scale / separate display of FIG. 8 (c) and the absolute scale / separate display of FIG. 8 (d), Indicates the proper aperture value according to the flash light, and is blinked to be distinguished from the display of the proper aperture value according to each of the stationary light and the total light.

Also, in the case of overlapping marks in the separate display, the display of the proper aperture value according to the flash light is prioritized to facilitate the discrimination between the display mark and the content of the display mark. In other words, in absolute scale,
If the mark that matches the value displayed on the digital display 3 blinks and there is only one other mark that does not blink,
The appropriate aperture value according to the flash light is almost equal to the appropriate aperture value according to the total light, and it means that these two points overlap. If the mark that matches the digital display value is not blinking and the mark at the -1Ev position is blinking from that mark, the appropriate aperture value according to the flash light and the appropriate aperture value according to the steady light are displayed. They are almost equal, indicating that these two points overlap. Also, it is clear that in all other cases all three points are displayed. If the OEv mark flashes during relative scale and only one other point is displayed, the appropriate aperture value according to the flash light and the appropriate aperture value according to the total light are almost the same, and the marks overlap. If the -1Ev mark flashes and only one other point is displayed, the appropriate aperture value according to the flash light and the appropriate aperture value according to the steady light are almost equal, and the marks overlap. Represent something.

In the analog scale of the display unit 2, the pitch of the diaphragm steps on the absolute scale is 0.5 Ev, and the pitch of the diaphragm steps on the relative scale is 0.2 Ev. The conversion of the photometric data into the data to be displayed on the display unit 2 is performed as follows. For example, in the case of the absolute scale normal display, as shown in FIG. 9, the aperture value Av (c) corresponding to the reference photometric amount is set to Av (c) corresponding to the first photometric value. 0), then (Av (0) −Av
(C)) / Aperture value Av by shifting the pitch by 0.5Ev
(0) Display with M0. And the aperture value Av according to the second photometric value
In (1), if SP1 is the difference between Av (1) and Av (0), S
Shift the pitch by P1 / 0.5Ev and set the aperture value Av (1) Displayed in M1, the aperture value Av (2) according to the third photometric value
SP2 / 0.5 where SP2 is the difference between Av (2) and Av (0)
Shift the pitch by Ev and set the aperture value Av (2) Display with M2.

The display unit 2 is provided with one LCD for each pitch of the absolute scale or the relative scale. As shown in FIG.
2 registers REG1, REG with the bit corresponding to the number of
Two are provided. Then, the LCD of the display unit 2 is turned on.
1 is set to the bit of the registers REG1 and REG2 corresponding to the LCD. Then, the aperture value according to the flash light in the separate display is displayed. Blinking, set 1 to the corresponding bit of register REG1,
This is performed by setting 0 in the corresponding bit of the register REG2 and switching the register REG1 and the register REG2 alternately at a frequency of 2 Hz, for example.

FIG. 11 is a block diagram showing the overall structure of the photometric device.

The relationship between each terminal of the CPU 100 and other circuits will be described.
Terminal STD1 switches between absolute scale display / relative scale display Static key 12 equivalent to SW7 and normal display /
Separate display switching Key equivalent to static key 13
Outputs the strobe signal of SW8. This terminal ST1 is "Low"
Signal output at level. The terminals ST2 and ST3 output the strobe signals of the key SW3 corresponding to the photometric start key 4, the key SW4 corresponding to the memory key 5, the key SW5 corresponding to the memory clear key 7, and the key SW6 corresponding to the memory recall key 6. These terminals ST1 and ST2 output signals at "Low" level. The terminals I2, I3 output the key strobe signal from the terminals ST1, ST2, ST3, and the keys SW3 to S3.
When any one of W8 is pressed, data indicating the pressed key is input. These terminals I2 and I3 are at "High" level with no keys being pressed.
When any one of 5, SW7 is pressed, the terminal I2 becomes "Low" level, and when any of the keys SW4, SW6, SW8 is pressed, the terminal I3 is pressed.
Goes to the “Low” level. Key interrupt pin INT1 is key SW
When any one of 3, SW4, SW5, and SW6 is pressed, the "Low" level is input, and the CPU 100 executes the key interrupt processing program described later from this time. Other key interrupts are prohibited during execution of this key interrupt processing program. Terminal CLO is CPU10
Outputs 0 and clock pulses for synchronization with other circuits.
The data terminal DSP outputs the display data of the display unit 3.
The data terminal DSP is connected to the latches 201, 202, 203 of the LCD driver 200 via the data bus DB1. Each bit of the data terminal DSP has a one-to-one correspondence with each of the LCD segments of the display unit 3. The terminal DSPC outputs a control signal for latching the data from the data terminal DSP to the latches 201, 202, 203 to the decoder 204 of the LCD driver 200. The terminal DSPC is connected to the decoder 204 via the data bus DB2. For example, when the data of (01) _B (() _B is a binary number) is output from the terminal DSPC, the data of the terminal DSP is latched by the latch 201. Similarly, from the terminal DSPC (1
0) When the data of _B is output, the data of the terminal DSP is latched in the latch 202, and when the data of (11) _B is output from the terminal DSPC, the data of the terminal DSP is latched in the latch 203. The terminal RESET inputs the signal from the power-on reset circuit including the resistor R and the capacitor C, and resets the CPU 100.

The terminal BUS1 is connected to the photometric circuit 300 via the data bus DB3, and the digital data of the photometric value from the photometric circuit 300 is sent to the CPU.
Capture to 100. The photometric circuit 300 converts analog data of the photometric value from the light receiving element 301 into digital data. The terminal I1 inputs a signal indicating that the A / D conversion is completed in the photometric circuit 300. When A / D conversion is completed, pin I1 goes high.
The terminal O4 outputs a pulse for instructing the photometric circuit 300 to start A / D conversion. When the terminal O4 becomes “High” level, the photometric circuit 300 starts A / D conversion. O3
Outputs to the photometric circuit 300 a signal for switching the timings of A / D conversion of flash light and A / D conversion of stationary light. When the terminal O3 is at "High" level, the photometric circuit 300 performs A / D conversion of flash light, and when the terminal O3 is at "Low" level, the photometric circuit 300 performs A / D conversion of continuous light. The terminal O2 outputs a signal that gives a timing for discharging the integrating capacitor of the photometric circuit 300. The terminal O2 outputs a signal at "High" level. The terminal O1 outputs a signal for instructing the photometric circuit 300 to start and end the integration. The time from the rise of terminal O1 to the fall is the integration time. The terminal BUS2 inputs the exposure time data externally set by the operation of the exposure time setting dial 9 from the exposure time setting circuit 401 via the data bus DB4. The terminal BUS3 is the film sensitivity setting dial 11 described above.
The film sensitivity data externally set by the operation of is input from the film sensitivity setting circuit 402 through the data bus DB5. Terminal BUS4 is the flash light ratio setting dial described above
The flash light amount ratio data externally set by the operation of 10 is input from the flash light amount ratio setting circuit 403 via the data bus DB6.

The terminal INT2 inputs the interrupt signal generated when the above-mentioned external setting data is changed. This interrupt is prohibited during the execution of photometry and calculation of photometric data, but the interrupt generated during the execution of the above program is retained by the setting of the flag, and when the processing of the above program is completed, this interrupt processing is executed subsequently. To be done. The circuit composed of the latches 404, 405, 406, the exclusive OR circuits 407, 408, 409 and the OR circuit 410 inputs the interrupt signal to the terminal INT2 when the above-mentioned external setting data is changed. The data bus DB4 is connected to the input terminals of the latch 404 and the exclusive OR circuit 407, respectively, and the output terminal of the latch 404 is connected to the exclusive OR circuit 4
07 is connected to the other input terminal of the exclusive OR circuit 407
Is connected to the first input terminal of the OR circuit 410. The output terminal of the logical sum circuit 410 is the terminal INT of the CPU100.
Connected to 2. The output terminal of the OR circuit 410 is connected to the clock terminal of the latch 404. Exclusive OR circuit 4
07 compares the data of the data bus DB4 and the output terminal of the latch 404. If even one bit is different, the set value of the exposure time is changed, so the exclusive OR circuit 407
The output terminal of becomes a "High" level, and this signal is given to the terminal INT2 of the CPU 100 via the OR circuit 410, and an interrupt is generated. At the same time, the output signal of the OR circuit 410 is given to the clock terminal of the latch 404, and the latch 404 takes in the changed data from the data bus DB4 and inputs this data to the exclusive OR circuit 407. At this time, since the two input data of the exclusive OR circuit 407 match, the output of the exclusive OR circuit 407 returns to the "Low" level, and the CPU
The terminal INT2 of 100 returns to the "Low" level. In this way, when the exposure time setting value is changed, the CPU 100 is interrupted. In addition, the latch 404 at power-on start
Since the exposure time setting data and the data in the latch 404 are different even if the data of the above is indefinite, the exclusive OR circuit 407 always generates the interrupt signal once and outputs the latching pulse to the latch 404, so that the final Exclusive OR circuit 40
The output of 7 becomes "Low" level, and CPU100 is in the waiting state for interrupt. In addition, latch 404 at power-on start
If the output of is matched with the data of the data bus DB4,
The output of the exclusive OR circuit 407 becomes "Low" level, and the CPU
There is no interrupt output to 100, and CPU 100 is in the interrupt waiting state.

The latch 405 and the exclusive OR circuit 408 detect that the setting data of the film sensitivity has been changed, and generate an interrupt signal of the CPU 100 in the same manner as described above.

Further, the latch 406 and the exclusive OR circuit 409 detect that the setting data of the flash light amount ratio is changed, and the CPU 100
Generates the interrupt signal of.

The clock pulses from the clock oscillator circuit 500 having a crystal oscillator are input to the terminals X1 and X2.

A liquid crystal display device (hereinafter referred to as LCD) 601 displays the digital display unit 3 described above, and an LCD 602 displays the analog scale display unit 2 described above. LCD601 digitally displays the proper aperture value calculated from the photometric value, and LCD602 displays the proper aperture value according to the photometric value by analog display in each of the normal display and the separate display in the above absolute scale display and relative scale display. To do.

In the LCD driver 200, a circuit for operating the LCD 601 is composed of a latch 201 that holds display data, a RAM 205 that stores segment data, and a segment driver 208, and a circuit of a data bus that connects the latch 201, RAM 205, and segment driver 208. Each bit corresponds to a display segment of LCD601. A circuit for operating the LCD 602 is composed of two sets of circuits of a latch 202, a RAM 206 and a latch 203, a RAM 207, a data selector 209 and a segment driver 210. In the data selector 209, the RAM 206 and the RA are at a frequency of 2 Hz.
The data of M207 is alternately selected and output to the segment driver 210 to blink a specific segment of the LCD 602. When the specific segment is blinking, one of the corresponding bits of the RAM 206 and the RAM 207 corresponding to the specific segment is set to 0 and the other is set to 1. decoder
204 receives the output data of the terminal DSPC of the CPU 100 as an input and generates the clocks of the latches 201, 202 and 203. Counter 211 is RA
It generates a read / write pulse φ ₀ for M205, 206, 207, an LCD drive clock φ ₁ , and a display blinking clock φ ₃ .

FIG. 12 shows the structure of the photometric circuit 300. SPD is a light receiving sensor, which outputs a signal according to the intensity of the received light. The circuit composed of the operational amplifier AMP and the logarithmic compression diode D1 logarithmically compresses the output of the light receiving sensor SPD, and the logarithmically compressed signal is logarithmically expanded by the circuit composed of the logarithmic expansion transistor Q1 and the mirror circuit Q2 via the analog switch SW1. ,
Furthermore, the logarithmic compression diode D2, the diode D3 and the integrating capacitor C integrate the logarithmic compression integration circuit. The logarithmic compression integration circuit outputs the integrated value of the logarithmic value of the output current of the light receiving sensor SPD. The above-mentioned analog switch SW1 conducts when the terminal O1 of the CPU 100 is “High”, and the period during which the analog switch SW1 conducts is the integration time by the integration capacitor C. The analog switch SW2 in parallel with the integration capacitor C is connected to the terminal O2 of the CPU100.
Is high, it conducts and discharges the integrating capacitor C. The analog data selector 302 outputs the voltage level signal of the integrating capacitor C when the terminal O3 of the CPU 100 is “High”, and the operational amplifier AM when the terminal O3 of the CPU 100 is “Low”.
Output P and output signal. When the terminal O4 of the CPU 100 becomes “High”, the A / D converter 303 converts the analog data from the analog data selector 302 into digital data. When the A / D conversion is completed, a signal indicating that the A / D conversion is completed is given to the terminal I1 of the CPU 100, and the digital data after the A / D conversion is output to the data bus DB3. This photometric circuit outputs the sum Q′vt of the integrated values of the respective logarithmic values of the flash light and the stationary light during the photometry during the time t1 shown in FIG. 2, and during the photometry during the subsequent time t2. Outputs the logarithmic value Bv of the stationary light. FIG. 13 shows waveforms of input / output signals between the photometric circuit 300 and the CPU 100 described above.

The 14th (a) to (h) are flowcharts showing the operation of the above-described photometric device. Table 1 shows the usage of registers in the CPU 100.

In Fig. 14 (a), CPU1
00 is reset, "1", "0", "0" are output to the key strobe terminals ST1, ST2, ST3, respectively, and at the same time, the interrupt terminals INT1, INT2 are set to the interrupt enable state. Also, all registers and RAM of the CPU 100 are cleared. When any of metering start key SW3, memory key SW4, memory clear key SW5 and memory call key SW6 is pressed, an interrupt signal is input to terminal INT1 and the processing from step # 1 of interrupt processing program INT1 starts. To do. When any of the exposure time, flash light intensity ratio setting dial 11 and film sensitivity setting dial 11 is changed, any external setting data such as exposure time, flash light intensity ratio or film sensitivity is changed.
The interrupt signal is input to T2, and the processing of the interrupt processing program INT2 shown in FIG. 14 (b) starts.

If a key interrupt occurs in step # 1, step # 2
, An interrupt occurs during photometry and calculation, and returns to the beginning of the program again during the process of this photometry and calculation.
In order to prohibit skipping over the interrupt processing program for changes in external setting data, interrupt signals are prohibited at interrupt terminals INT1 and INT2 until the operation is completed. Step # 3
Then, the CPU 100 sets the strobe terminal ST1 to "High", and sequentially outputs the "Low" level signal to the strobe terminals ST2 and ST3. At this time, a "Low" level signal is input to one of the key input terminals I2 and I3 according to the pressed key of the keys SW3 to SW6. When the strobe terminal ST2 is "Low" and the key input data is (I2, I3) = (0,1) _B , the memory clear key SW5 is pressed and the key input data is (I
2, I3) = (1,0) When _B , the memory recall key SW6 is pressed. When the strobe terminal ST3 is "Low" and the key input data is (I2, I3) = (0, 1) _B , the metering start key SW ₃ is pressed and the key input data is (I2, I3) = (1,
When it is 0), memory key SW4 is pressed. The key pressed in the key discrimination in step # 3 is the metering start key.
If SW3, proceed to the photometric routine in step # 4. If the pressed key is the memory clear key SW5, the process proceeds to the memory clear routine in step # 25. If the pressed key is the memory key SW4, the process proceeds to the memory display routine of step # 26. If the pressed key is the memory recall key SW6, the process proceeds to the memory recall processing routine for displaying the memory value in step # 103.

If it is determined in step # 3 that the metering start key SW3 has been pressed, the metering in steps # 4 to # 14 is performed. At this time, the terminal O1 becomes “High” at the same time, so that the thyristor SCR becomes conductive through the buffer BA, and the terminals t ₀ , t ₁
A light emission start signal is output from and the flash light emitting device 700 starts flash light emission. Go to Step # 4, CP
The U100 sets the terminal O1 to "High" to output an integration start signal and the terminal O2 to "Low" to start integration of the flash light. At the same time, the analog data selector 302 (10th
In the figure), the selection signal of "High" is input from the terminal O3, and the integrated voltage of the integrating capacitor C is output to the input terminal of the A / D converter 303. In step # 5, WAIT1, the integration time of the photometric value of the flash light elapses. When the integration time ends, the process proceeds to step # 6, the integration start signal at the terminal O1 becomes "Low", the analog switch SW1 is turned off, and the integration capacitor C
Is sample-held. At the same time, A / D converter 3
An A / D conversion start signal is input to the terminal 03 from the terminal O4 at "High" level, and the A / D conversion of the charging voltage of the integrating capacitor C is started. The A / D converter 303 outputs the A / D conversion end signal to the terminal I1 of the CPU 100 at the “High” level at the same time as the end of the A / D conversion.
In step # 7, the A / D conversion end signal I1 is repeatedly checked until the A / D conversion end signal becomes "High". When the A / D conversion end signal I1 becomes "High", step # 8
Then, the logarithmic integral value Q′vt of the flash light is input from the A / D converter 303 via the data bus DB3. Step # 9
Then, set the A / D conversion start signal of terminal O4 to "Low" and the A / D converter
303 is reset and the integration reset signal of terminal O2 is set to "High".
As a result, the analog switch SW2 is turned on to discharge the integrating capacitor C. WAIT2 in step # 10 is A / D converter 30
It's time for 3 resets. Steps # 11 to # 14
Now, measure the ambient light. Terminal in step # 11
The selection signal of the O2 analog data selector 302 is set to "Low", and the output of the operational amplifier AMP is input to the A / D converter 303.
The processing in steps # 12 to # 14 is the same as that in measuring the flash light in steps # 7 to # 9, and thus the description thereof is omitted. The measured value at the steady destination is the subject brightness B′v in the A / D converter 303.
It is A / D converted and input to the CPU 100 via the data bus DB3. When the flash light measurement in steps # 4 to # 10 and the stationary light measurement in steps # 11 to # 14 are completed, the setting data is read by the external setting keys in steps # 15 to # 20. At step # 16, the exposure time Tvs is read from the terminal BUS2. Film sensitivity from terminal BUS3 in step # 18
Read Sv. In step # 20, the flash light amount ratio Gv is read from the terminal BUS4. This Gv value can be set as ± 1Ev, ± 2Ev, ... With OEv being the measured value of the flash light. At the end of step # 20, all the data necessary for display has been acquired. CPU1 at this point
The data that 00 has is shown below.

Q'vt: Logarithmic integrated light quantity of stationary light and flash light, subscript t
Indicates the total of stationary light and flash light. '(dash)
Represents the measured value.

B′v: Measured value of subject brightness.

Tvs: Set value of exposure time, subscript s represents the set value.

Sv: Set value of film sensitivity.

Gv: Flash light intensity ratio setting value.

Tvc: Logarithmic value of integration time.

Steps # 21 to # 24 are a calculation routine for separating the logarithmic integrated light quantity Q'vt of the flash light including the stationary light into the stationary light quantity Q'va and the flash light quantity Q'vf.

The calculation contents of this calculation routine are as follows. The relationship between the logarithmic integrated light quantity Q′vt of the sum of the stationary light and the flash light, the logarithmic integrated light quantity Q′vf of the flash light, and the logarithmic integrated light quantity Q′va of the stationary light is as follows.

2 ^Q'vt = 2 ^Q'vf +2 ^Q'va (1) The expression (1) is a relational expression with a linear value. The logarithmic integrated light quantity of the stationary light is the integration time of the flash light quantity 2 ^-T v
It is calculated from c (= WAIT1) and the brightness Bv of constant light by the following formula.

2 ^Q'va = 2 ^B v · 2 ^-T vc If the logarithm of log _{2 on} both sides is taken, then Q'va = Bv-Tvc (2).

Now, from equation (1), 2 ^Q'vf = 2 ^Q'vt -2 ^Q'va = 2 ^Q'va (2 ^Q'vt-Q'va -1) If the logarithm of log ₂ is taken on both sides, Q ' vf = Q′va + log ₂ (2 ^{Q′vt−Q′va} −1) ...
(3) Here, first, d ₁ = Q′vt−Q′va is obtained, Then, the value is obtained and is substituted into the equation (3). Further, the value of the above-mentioned expression (2) is substituted for Q'va. From the above, the logarithmic integrated light amount of the flash light can be obtained. It is steps # 21 to # 24 that execute the above calculation.

In step # 21, the stationary light quantity Q'va is obtained from the difference between the photometric value B'v and the logarithmic value of the integration time. In step # 24, the flash light quantity Q'vf is obtained.

The values determined for d ₁ in advance step # 22, corresponding to the value of the d ₁ at step # 23 The value of is calculated from the logarithmic table created in the ROM of CPU100.

Steps # 30 to # 37 in FIG. 14 (c) are a calculation process for converting the photometric data and the memory data into display data. Here, Qva (0), Qvf (0), Bv (0), Ava (0), Avf
(0) indicates photometric data or a calculated value obtained from the photometric data. That is, Qva (0) = Q'va, Qvf
(0) = Q'vf, Bv (0) = B'v. Others indicate memory values or calculated values obtained from the memory values.
The register REG4 is used as a register for designating the address of the memory RAM. Register REG4 in step # 30
Is set to 0, and in steps # 31 to # 36, the proper aperture value Ava (0) corresponding to only the steady light, the proper aperture value Avf (0) corresponding to only the flash light, and the proper aperture value A corresponding to the total light are set.
Obtain vt (0), and proceed to step # 37.

The value of is obtained from the logarithmic table in step # 35. In step # 37, it is judged by comparing the contents of the register REG4 and the number of memories MN whether or not the conversion of the measured value and the memory value into the display data is completed. If they do not match, the process proceeds to step # 38 and 1 is set in the register REG4. And again step # 31
~ Repeat # 37. Contents of register REG4 and number of memories
If the MNs match, the process proceeds to step # 39. When the key is discriminated in step # 3 and the pressed key is the memory clear key, the number of memories is MN = 0. Therefore, in step # 37, REG4 = MN = 0 at the first time, and the process branches to step # 38. No, proceed to Step # 39-1.

In step # 39-1, the measurement data number 0 is set in the register REG0 indicating the display data number. Hereinafter, in the description of the photometry start processing routine, 0 is substituted in the register (REG0) and displayed. Step # 39-2
Is the normal display / separate display switching static key
Determine the status of SW8. CPU100 is key strobe terminal ST1
A low level signal is output only to the normal input, and whether the normal display or the separate display is determined by the "Low" or "High" of the key input terminal I2. If the key input terminal I2 is "Low", proceed to step # 40 with normal display. When the key input terminal I2 is "High", proceed to step # 45 in separate display.

In the key discrimination in step # 39-2, the key input terminal I2
When the input signal of is "Low", the process proceeds to steps # 40 to # 44 which is a normal display routine. When the process proceeds to step # 40, the flag SPF is set to 0 in order to distinguish between the normal display and the separate display. If SPF = 0, it is a normal display, and if SPF = 1, it is a separate display. Proceeding to steps # 41 to # 44, the appropriate aperture value Avt (MN): MN = 1-10 corresponding to the memory value of the total light is changed to the relative value SP (MN): MN = 1-10 with respect to the measured value Avt (0). Replace with. The above processing is repeated for the number of memories. The program then proceeds to the data decoding routine after step # 48 for converting the display data into data corresponding to the display segment.

In the key discrimination in step # 39-2, the key input terminal I2
When the input signal of is "High", the process proceeds to steps # 45 to # 47 which is a separate display routine. In step # 45, 1 is set to the flag SPF that distinguishes between normal display and separate display. Here, it is a separate display when SPF = 1. Since register REG0 = 0, SP in step # 46
(1) is the proper aperture value Avt according to the measured value of total light
It is the relative value of the proper aperture value Avf (0) corresponding to the measured value of the flash light with respect to (0), and SP (2) in step # 47.
Is a relative value of the proper aperture value Avt (0) corresponding to the measured value of the stationary light to the proper aperture value Avt (0) corresponding to the measured value of the total light. The program then proceeds to the routines after step # 48.

In the key discrimination of step # 48 in FIG. 14 (d), the state of the absolute scale display / relative scale display switching static key SW7 is discriminated. The CPU100 outputs the "Low" level signal only to the key strobe terminal ST1, and outputs the "Low" level signal from the key input terminal I3 to "Lo".
Determine whether it is an absolute scale display or a relative scale display by "w" or "High". When the key input terminal I3 is "Low", it is a relative scale display, and the process proceeds to step # 49. The key input terminal I3 is "High". Is the absolute scale display,
Go to step # 66.

Absolute scale display / relative scale display switching When the static key SW7 is switched to the relative scale, the process proceeds to step # 49, and the analog display segment data (00 ... 1 ... 00) _B is stored in the analog display registers REG1, REG2. Each bit of the registers REG1 and REG2 has a one-to-one correspondence with each dot segment of the analog display liquid crystal. Also, MSB
The bit located in the center between LSB and LSB corresponds to the center dot of the analog display liquid crystal, and corresponds to the bit in which 1 of the analog display segment data (00 ... 1 ... 00) _B stands. The display segment data latched in the latch 202 of the LCD driver 200 is stored in the register REG1. Latch in register REG2
The display segment data latched in 203 is stored. The register REG1 and the register REG2 have the same contents in the absolute scale display, but in the separate display, different values 0 and 1 are set only in the bit indicating the proper aperture value according to the flash light. In step # 50, the flag SPF for distinguishing between normal display and separate display is checked. When SPF = 1, the routine proceeds to the relative scale separate display routine at step # 51, and when SPF = 0, the routine proceeds to the relative scale normal display routine at step # 60.

In the relative scale separate display, the proper aperture value according to the total light is displayed as a dot as a center, and the proper aperture value according to the stationary light and the proper aperture value according to the flash light are displayed at relative positions from the central dot. At the same time, in order to distinguish between the proper aperture value according to the flash light and the proper aperture value according to the constant light, the dot indicating the proper aperture value according to the constant light is always lit and the proper aperture value according to the flash light is The dot indicating indicates blinks at 2Hz. Steps # 51 to # 5
Reference numeral 9 is a data exchange routine for relative scale separate display. In step # 51, the relative value SP (1) of the proper aperture value according to the flash light obtained with the scale # 46 and the proper aperture value according to the total light is converted into the decoder data SP (1) decode I corresponding to the segment. It is stored in the working register for display REG3.

FIG. 14 (g) shows a specific flow of the above step # 51. In step # 111, display register R in step # 49
The contents of EG1 are stored in working register REG3. In step 112, it is determined whether the relative aperture value SP (1) of the proper aperture value according to the flash light is positive or negative with respect to the proper aperture value according to the total light of the measured value REG0 = 0 obtained in step # 46. SP
If (1)> 0, the working register REG3 is bit-shifted to the left (to the MSB side) to proceed to the routine of steps # 113 to # 115. If SP (1)> 0 is not satisfied, the working register REG3 is moved to the right. Toward (to the LSB side) bit shift proceeds to the routine of steps # 119 to # 121. When SP (1)> 0, the process proceeds to steps # 113 to # 115. In step # 113, the minimum dot resolution of 0.2Ev (provisionally, the dot pitch is described as a separate display of 0.2Ev and a normal display of 0.5Ev) is set as a relative value SP. Subtracting from (1), in step # 114, it is determined whether the relative value SP (1) is positive or negative. If positive, the process proceeds to step # 115, the working register REG3 is bit-shifted to the left, and the process proceeds to step # 113 again. Return. Here, when bit-shifting to the left, LSB is (0) _B
Shall be sequentially set. If the relative value SP (1) is negative in step # 114, the process proceeds to overscale processing in step # 116. Therefore, when the process proceeds to step # 116 after passing through step # 115 N times, the working register REG3 is set to 1 at a position where the bit set to 1 from the state of step # 113 is moved to the left by N bits. ing. At step # 116, the overflow due to the bit shift to the left is discriminated. When the overflow occurs due to the bit shift, the value of the working register REG3 becomes 0, which is used for the determination. When an overflow occurs, the process proceeds to step # 117, the MSB of the working register REG3 is set to 1, and the dot at the left end is displayed at the time of display to provide an overrange display. If no overflow has occurred, this routine is ended in step # 118. Relative value SP in step # 112
If (1) is not positive, proceed to steps # 119 to # 121,
The minimum resolution 0.2Ev is added to the relative value SP (1) until the relative value SP (1) becomes positive, and the working register REG3 is bit rightward for this number of additions. In steps # 122 and # 123, it is determined whether or not the overflow has occurred due to the bit shift to the right by whether or not the working register REG3 is 0. If the overflow has occurred, 1 is set in the LSB of the working register REG3. If no overflow has occurred, this routine is finished as it is.

In FIG. 14 (d), in step # 52, the logical product of the contents of the register REG1 with the central bit set to 1 and the contents of the display working register REG3 is taken, and it is determined whether this logical product is not 0 or not. . When the logical product is not 0, that is, when the proper aperture value according to the total light and the proper aperture value according to the flash light are almost equal and the dot indicating the proper aperture value according to the flash light overlaps with the central dot, step Proceeding to # 53, the central bit is set to 0 only in the register REG2, and data is set so that the central dot blinks. When the logical product is 0 in step # 52, there is no overlap between the dot having the proper aperture value corresponding to the total light and the dot having the proper aperture value corresponding to the flash light, and therefore the process directly proceeds to step # 54. Proceeding to step # 54, the contents of the register REG1 and the contents of register REG3 are ORed,
The result is stored in the register REG1. In the register REG1, (1) _B is set to the central bit corresponding to the central display dot indicating the proper aperture value according to the total light and the bit position indicating the appropriate aperture value according to the flash light. In step # 55, the relative value SP (2) between the proper aperture value according to the stationary light and the proper aperture value according to the total light obtained in step # 47 is set to the decode data SP corresponding to the segment.
(2) Working register for display after converting to decode 1
Pay in REG3. The conversion method is the same as that of SP (1), and therefore its explanation is omitted. In step # 56, the logical product of the complementary data in the register REG1 and the register REG2 is calculated, and the result is stored in the working register REG5. As a result, in the working register REG5, (1) _B is set only in the bit position indicating the proper aperture value according to the flash light. In step # 57, the working register REG5 is ANDed with the working register REG3 containing the decode data SP (2) decode1 of the proper aperture value corresponding to the constant light, and the constant light is determined depending on whether the result is 0 or 0. It is determined whether or not the appropriate aperture value according to the above and the appropriate aperture value according to the flash light are equal and the display dot positions overlap.
When the result of the logical product is 0, there is no overlap, so the flow proceeds to steps # 58 and # 59, and in step # 58, the display register REG1
And the contents of the working register REG3 are stored in the display register REG1, and in step # 59, the data of the logical sum of the contents of the display register REG2 and the contents of the working register REG3 are stored in the display register REG2. Therefore, in the display register REG1, (1) _B is set in 3 bits corresponding to the proper aperture value according to the total light, the proper aperture value according to the stationary light, and the proper aperture value according to the flash light, or the total light If the appropriate aperture value according to the light and the appropriate aperture value according to the stationary light match, and if the appropriate aperture value according to the total light and the appropriate aperture value according to the flash light match, (1) is set to 2 bits. _B stands. However, it is impossible that all three proper aperture values match. On the other hand, in the display register REG2, the bit corresponding to the appropriate aperture value according to the flash light is set to (0) _B with respect to the display register REG1. If the result of the logical product is not 0 in step # 57, the dots overlap. At this time, since the three points of the proper aperture value according to the total light, the proper aperture value according to the flash light and the proper aperture value according to the stationary light do not overlap, the proper aperture value according to the total light and the flash With respect to the display register REG1 having the display dot position of the proper aperture value according to the light, the display register REG2 need only be set with the central bit indicating the proper aperture value according to the total light. Therefore, if the result of the logical product is not 0 in step # 57, it is not necessary to operate the display registers REG1 and REG2, and the process directly proceeds to the display routine of step # 83 and thereafter.

If the flag SPF for discriminating between normal display and separate display in step # 50 is 1, steps # 60 to # 6
Go to the data conversion routine for the relative scale normal display of 5. The working register REG4 is a register that stores a memory value number. In step # 60, 1 is set in the working register REG4. In step # 61, the display data SP decoded into the dot display of the relative memory value of the proper aperture value according to the total light of the register REG4 number.
(REG4) Decode I is stored in register REG3. At step # 62, the logical sum of the register REG3 containing the display data SP (REG4) decode I and the display register REG1 is calculated,
In step # 63, the logical sum of the register REG3 and the display register REG2 is calculated, and 1 is set to the bit corresponding to the display dot position of the memory value indicated by the register REG4 in both the display registers REG1 and REG2. In step # 64, the contents of the register MN that stores the number of memory values and the contents of the register REG4 are compared to determine whether or not the processes of steps # 61 to # 63 have been completed for all memory values. If the content of the register REG4 has not reached the memory number MN, step #
Proceed to step 65, add 1 to register REG4, and proceed to step # 61-
Repeat # 64. When the register REG4 and the register MN containing the number of memories match in step # 64, the display of all the memory values ends, and the process proceeds to the display routine of step # 83 and thereafter.

Absolute scale display / in the key discrimination in step # 48
Relative scale display switching When the static key is switched to absolute scale display (key input terminal I3 is "Low")
In step # 66, the proper aperture value corresponding to the total light measurement value obtained in step # 36 is converted to analog display segment data Avt (REG0) Decode II
Are stored in the analog display registers REG1 and REG2. here,
Avt (REG0) Decode II, which is the value obtained by converting the proper aperture value according to the measured value of total light into analog display segment data.
Is a bit that corresponds to the dot position that shows the proper aperture value Avt (REG0) according to the total light on the analog display scale and is set to 1, and bits that correspond to other dot positions are set to 0. Has been done.

FIG. 14 (h) shows a specific example of the process of converting the proper aperture value according to the measured value of total light into analog display segment data. At step # 120, the aperture value of the minimum value dot among the analog display dots is subtracted from the appropriate aperture value Avt (REG0) according to the total light measurement value, and the difference SP (0) is obtained. In step # 121, the analog display register REG
Set 1 to the MSB corresponding to the display dot with the minimum value of 1,
Set other values to 0 (10 ... 0) _B. In steps # 122 to # 124, the register REG1 is bit-shifted to the right (towards the MSB) every time the dot resolution in absolute scale display is reduced by 0.5 Ev, and when the value of SP (0) becomes 0 or negative, Cut out the loop. In step # 125, the contents of the register REG1 are transferred to the pair of analog display registers REG2. Both the analog display registers REG1 and REG2 have a value Avt (REG0) decode II in which the proper aperture value Avt (REG0) corresponding to the measured value of the total light is converted into analog display segment data.

In the processing of only steps # 112 to 124, the analog scale-over processing of the data is not performed, but since it is not the processing related to the present invention, the over-scale processing is omitted and it is assumed that no scale-over occurs in this program. explain.

Steps # 67 to # 82 in FIG. 14 (e) are display data processing routines in the relative scale display.
Perform the same process as # 65. In other words, in step # 67, a separate display (SPF =
In the case of (1), the display data conversion processing for the separate display of steps # 68 to # 76 is performed, and in the case of the normal display (when SPF = 0), the normal display of the steps # 77 to # 82 is performed. Performs display data conversion processing. Since this process is the same as steps # 50 to # 65, duplicate description will be omitted. The SP (1) decode II in step # 68 is the optimum aperture value according to the flash light obtained from the relative value SP (1) between the proper aperture value Avt according to the total light and the proper aperture value Avf according to the flash light. Shows the display segment data,
The bit corresponding to the display dot indicating the absolute value of the proper aperture value according to the flash light is set to 1. Steps # 69 to # 71 are a routine for processing the overlap between the display dot of the proper aperture value according to the total light and the display dot of the proper aperture value according to the flash light. Step # 72 SP
(2) Decode II is an appropriate aperture value Avt according to the total light
And the appropriate aperture value Ava according to the ambient light. The display segment data of the appropriate aperture value according to the ambient light obtained from the relative value SP (2). The display shows the absolute value of the appropriate aperture value according to the ambient light. The bit corresponding to the dot is set to 1.
Steps # 74 to # 76 are a routine for processing the overlap between the display dot having the proper aperture value according to the constant light and the display dot having the proper aperture value corresponding to the flash light. Step # 77 ~
# 82 converts the display data of the memory value. SP (REG4) decode II in step # 78 is working register REG4
7 shows the display segment data of the memory value obtained from the relative value SP (REG4) between the memory value Avt (REG4) and the measured value Avt (0). When the separate display routine of steps # 68 to # 76 or the normal display routine of steps # 77 to # 82 is completed, the process proceeds to the display data output routine of step # 83 and thereafter.

When the conversion of the measured values and memory values into analog display data is completed, the process proceeds to step # 83, and the data obtained by converting the proper aperture value Avt corresponding to the measured value of total light into the segment decoder value of F value is displayed for digital display. Store in register REG6 and display data after step # 84 LCD driver 200
To the output routine.

Proceeding to step # 84, the data in the register REG6 that stores the digital display data is displayed on the display data bus DSP.
Output from the BUS to the data input of the latches 201 to 203 of the LCD driver 200, output (01) _B from the display control output DSP in step # 86, send a clock signal to the latch 201, and output the output of the latch 201 to a new digital signal. Change to display data. Similarly, steps # 86 and # 87 are latch 2
02, steps # 88 and # 89 change the output data of the latch 203 to new analog display data. In step # 90, a "Low" level signal is sequentially output to the key strobe terminals ST2 and ST3, and it is determined whether the data is 0 or not at the key input terminals I2 and I3, respectively. If no key is pressed ((I2, I3) _B = (0,0)
If _B ), go to step # 92. If the key is still pressed ((I2, I3) _B ≠ (0,0) _B ), the discrimination loop of step # 90 is repeated until the key is released.
This is so that during the memory recall processing routine, the recalled memory value is displayed only while the key is pressed. Further, it is also effective in preventing the key processing from being performed a plurality of times during one key operation.
If no key is pressed in step # 90, the process proceeds to step # 91 to discriminate the memory recall processing flag RCF. The flag RCF is 0 when processing is performed by pressing a key other than the memory recall key. If RCF = 0, LCD6
Since the display of 01,602 shows the final measurement data,
The process proceeds to step # 92 as it is, the interrupt of the CPU 100 is enabled, the stop state of step # 93 is entered, and the CPU 100 waits for an interrupt input.

If the pressed key is the memory clear key in step # 3 of FIG. 14 (a), the program proceeds to step # 26. In step # 26, it is determined whether or not the number of memory data already stored exceeds the maximum number that can be stored. If the maximum number that can be memorized is 10, then in step # 26, (10) has already been reached.
_D pieces (() _D is the decimal) if there is memory data, pay data error message indicating that the memory number of the step # 73 has exceeded the maximum number on the digital display register REG6, step # 74 and subsequent Go to the display loop of. If the number of memories is less than the maximum number (10) in step # 26, the process proceeds to step # 27, 1 is added to the memory number register MN, and steps # 28, # 2
In 9, the measured value Q ′ is stored in the RAM Qvf (MN) corresponding to the register MN.
The measured value Bv is stored in vf and RAM Bv (MN). After that, the program proceeds to step # 30 to display the photometric data and memory data again. Since step # 30 and subsequent steps have already been described by the photometric start key processing, description thereof will be omitted.

If the pressed key is the memory clear key in step # 3, the program proceeds to step # 25, resets the register (MN) which stores the number of memory data to 0, and executes the memory key processing. And proceed to step # 30. At this time, if the normal display is selected as the display method, steps # 42, # 64, #
At 81, (REG4) = (MN) is established for the first time. Therefore, the data displayed on the LCD at the time of proceeding to step # 90 is only the measured value.

If the pressed key is the memory recall key in the step # 3 key discrimination, the program proceeds to step # 3.
Continue to 103. At step # 103, 1 is set to the flag RCF indicating that the memory recall process is in progress. The register REG7 stores the memory data number to be displayed when the memory recall key is pressed. The register REG7 has a value between 1 and the number of memories MN when memory data exists, but becomes 0 when the memory value does not exist, and the display shows the final measured value, which is apparently displayed. There is no change in content. The register REG7 is decremented by 1 each time the memory recall process is performed, and at the end of the process, the memory data number to be displayed when the memory recall key is pressed next time is stored. In step # 104, register REG
Determine whether 7 is the number 0 indicating the measured value,
If it is 0, the process proceeds to step # 105. The maximum value of the memory data number is stored in the register REG7 (the number of memory data: M
N), and proceed to step # 106. When there is no memory value, 0 is set again in the register REG7. If the register REG7 is not 0 in step # 104, the process directly proceeds to step # 106. Register RE in step # 106
Register REG0 that stores the number of data that displays the contents of G7
Transfer to. In step # 107, the normal display / separate display switching static key is determined. In the case of normal display, the process proceeds to step # 83, and the digital display data is replaced with the F value segment decode value of the memory value Avt (REG0) indicated by the register REG0.
Proceed to the display data output process of # 87. Therefore, in the case of normal display, the display content of the analog display liquid crystal LCD 602 does not change, but the digital display liquid crystal LCD 601 does not register RE.
A value obtained by converting the memory value Avt (REG0) of the number indicated by G0 into the F value is displayed. However, when the memory value does not exist, the measured value is displayed, so that the LCDs 602 and 601 do not change. In the case of separate display by the key discrimination in step # 107, the process proceeds to steps # 45 to # 59 and # 83 to # 89, and the LCD 602 and 601 both display the value obtained by converting the memory value of the number indicated by the register REG0 into the F value. It When there is no memory value, REG = 0, so the measured value is displayed as in the normal display, and the liquid crystal does not change apparently.
In step # 90, it is detected that the key is released, and the process proceeds to the next. Therefore, the liquid crystal continues to display the recalled memory data as long as the memory recall key is pressed. When the memory recall key is released, the process proceeds to step # 91 to proceed to the processing routine for returning the display to the display of the original measured value data. Therefore, in step # 91, it is determined by the flag RCF whether or not the processing up to that point was the memory recall processing. When the process is started with the memory recall key and step # 91 is reached,
Since the flag RCF remains set to 1 in step # 103, it always branches to step # 108. In step # 108, the memory data number (REG7) -1 displayed when the memory recall key is pressed next time is stored in the register REG7. In step # 109, the flag RCF is reset to 0 to indicate that the memory recall process is completed, and the process proceeds to step # 39-1. Step # 39-1
Then, the register where the memory data number was stored
Replace REG0 with the measurement number 0 and repeat step # 39-
The display contents of the liquid crystal are returned to the display of the measured values by passing through the routines of # 2 to # 90. After this, when the process reaches Step # 91, the flag RCF is 0, so Step # 92-
Proceed to # 93 to stop the program and wait for an interrupt.

When the data of any of the exposure time setting dial, flash light ratio setting dial or film sensitivity setting dial is changed, an interrupt signal is input to the interrupt terminal INT2 of the CPU100 and the interrupt flag of the CPU100 is set.
If the CPU 100 is in the stopped state, the process immediately proceeds to the setting data change processing routine of step # 95 and thereafter, but if the CPU 100 is in the interrupt disabled state while executing some processing, the interrupt flag is checked after the processing is completed, The setting data change process after step # 95 is performed. Step # 96 prohibits the processing from being interrupted by an interrupt signal during the processing operation.
In steps # 97 to # 102, the data whose setting has been changed is read. After that, the process proceeds to step # 30 of the measurement start key processing routine. In steps # 30 to # 38, the measurement value is recalculated using the changed setting data, conversion to display data in steps # 39-1 to # 83, step # 84 to
# 89 display data output, step # 90 key OFF waiting,
The flag is discriminated in step # 91, the interrupt is permitted in step # 92, and the program is stopped.

A specific example of the data processing when the display dots overlap in the relative scale separate display, which is the processing of steps # 49 to # 59 in FIG. 14D, is shown below. Here, the number of display dots will be described as 5 bits for convenience. The dot pitch is 0.5 Ev.

When SP (1) <0.5 Ev (the appropriate aperture value for total light and the appropriate aperture value for flash light are almost equal) As a result of the above processing, the contents of register REG1 is (10100),
The content of register REG2 becomes (10000), and register REG1,
The first bit of 2 corresponds to a display dot having an appropriate aperture value according to the ambient light, both registers REG1, 2 are 1, and this display dot in the LCD 602 remains lit and does not blink. The third bit of registers REG1 and 2 corresponds to a display dot in which the proper aperture value according to the total light and the proper aperture value according to the flash light overlap, and register REG1 is 1
Since REG2 is 0, this display dot blinks on the LCD 602.

When SP (2) <0.5Ev (the appropriate aperture value for total light and the appropriate aperture value for stationary light are almost equal) As a result of the above processing, the contents of register REG1 is (10100),
The content of register REG2 becomes (00100), and register REG1,
The 1st bit of 2 corresponds to the display dot of the proper aperture value according to the flash light, register REG1 is 1 and register REG2
Is 0, and the display dot blinks on the LCD 602. Further, the third bit of the registers REG1, 2 corresponds to a display dot in which the proper aperture value according to the total light and the proper aperture value according to the stationary light overlap, and the registers REG1, 2 are both 1, and the LCD6
In 02, this display dot remains lit and does not blink.

In the case of SP (1) ≈ SP (2) (the appropriate aperture value according to the flash light and the appropriate aperture value according to the steady light are almost equal) As a result of the above processing, the contents of the register REG1 becomes (01100) and the contents of the register REG2 becomes (00100).
The second bit of is equivalent to a display dot in which the proper aperture value according to the flash light and the proper aperture value according to the stationary light overlap, the register REG1 is 1 and the register REG2 is 0, and the LCD6
In 02, this display dot blinks. Also register
The third bit of REG1,2 corresponds to the display dot of the proper aperture value according to the total light, both register 1 and 2 are 1 and LCD60
In 2, this display dot remains lit and does not blink.

FIG. 15 is a flow chart relating to the second embodiment of the present invention. In the embodiment of FIG. 2, only the processes of the flash light metering and the stationary light metering in the above-described first embodiment are changed, so only the changed parts are shown. In the second embodiment as a whole, if step # 4 in FIG. 14 (a) to step # 24 in FIG. 14 (b) are replaced with step # 201 to step # 217 in FIG. 15, it will be understood. Good. When it is determined that the photometry start key is pressed, the CPU reads the externally set exposure time Tvs, film sensitivity Sv, and flash light amount ratio Gv. Output port O in steps # 201- # 206
Controls 1, O2, O3 and starts flash light metering. WAIT3 in step # 207 waits for the time set in the exposure time setting in step # 200. This allows
In the second embodiment, the flash light metering is performed at the exposure time set. Steps # 208 to # 216 indicate the same processing as steps # 6 to # 14 of the first embodiment, and therefore the description thereof is omitted here.
Since the exposure time, the film sensitivity and the flash light amount ratio are set in steps # 201 to # 205, there is no step corresponding to steps # 16 to # 20 in the first embodiment. From step # 217 to step # 220, the logarithmic integrated light quantity Q′vt of the flash light including the stationary light is changed to the stationary light quantity Q′va.
And a flash light quantity Q′vf. Since Q′vt is measured at the time set by the exposure time setting, in step # 217, the stationary light quantity Q′va that should be obtained at the same time as the flash light measurement time is calculated. The calculation after step # 218 is omitted because it has been described in steps # 22 to # 24 of the first embodiment.

The flash light measurement time in the first embodiment is 2- ^T vc, which is a constant time. This time is set to be longer than the time from the start of flash light emission to the stop of flash light emission. Therefore, an error will occur if the shutter speed is set so high that the flash light is still emitted. On the other hand, since the second embodiment is a real-time measurement based on the set time, when measuring the flash light at a high shutter speed such that the flash light is still emitting, unlike the first embodiment, a measurement error It is possible to measure without.

FIG. 16 relates to the third embodiment of the flash light metering and stationary light metering processing, and shows a flowchart of only the changed portions in the same manner as the second embodiment. In this example, when the exposure time setting is set to a higher speed side than the constant time 2 ^-T vc, the flash light is measured in real time according to the set time, and 2 is used for the lower speed side than the time 2 ^-T vc. ^-T vc performs flash light metering at a fixed time. In this embodiment, when a high shutter speed such that the flash light continues to be emitted is set, no measurement error occurs, and when a low shutter speed is set, the same as in the second embodiment. Instantaneous measurement is possible because unnecessary long-time measurement is not performed. In FIG. 16, in step # 309 from step # 307, the exposure time setting than 2 ^-T vc determines whether high speed side or low speed side, the exposure time setting from 2 ^-T vc is the high-speed side, i.e. Tvs ≧ In the case of Tvc, WAIT3 waits for the time according to the exposure time setting. As a result, the flash light metering is performed at the set exposure time. 2 ^-T vc has a lower exposure time setting, that is, T
When vs <Tvc, WAIT1 waits for a time of 2 ^- Tvc. As a result, in steps # 319 to # 321 in which the flash light metering is performed in the time of 2- ^T vc, the steady light intensity Q ′ at the time when the flash light metering is performed is performed.
va is calculated. The other processing is the same as that of the second embodiment, and will be omitted.

EFFECTS OF THE INVENTION As described in detail above, according to the display device of the present invention, the difference in the contribution of the flash light and the steady light at the time of shooting is displayed as a distance on the scale. Very easy to do. For example, consider the case where a dangsten lamp is used as the constant light and an image is taken on a normal daylight film. In this case, when the contribution of the tungsten light (steady light) is larger than that of the flash light, the finished photograph becomes yellowish. Conversely, if the contribution of tungsten light is smaller than that of flash light, the photo will be reproduced in colors similar to those taken in the sun. As described above, the difference in the contribution of the stationary light and the flash light has a great influence on the color reproduction of the photograph. Therefore, the display device of the present invention is very effective to see the difference in the contribution at a glance.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of the present invention, FIGS. 2 (a), (b), (c) and FIGS. 5 (a), (b),
(C) is a graph showing the photometric amount of the subject light, FIG. 3 is a diagram showing the photometric position of the subject, FIGS. 4 and 6 are diagrams showing examples of display on the display unit, and FIG. 7 is a diagram showing the photometric device. Front view showing an example of the external appearance, FIGS. 8 (a), (b), (c), and (d) are views showing examples of display on the display unit 2, and FIG. 9 is conversion of photometric data into display data. Fig. 10 shows the method for
And FIG. 11 is a block diagram showing the overall configuration of the present invention, FIG. 12 is a circuit diagram showing the configuration of the photometric circuit, and FIG. 13 is input / output between the photometric circuit and the CPU. FIG. 14 (a) to FIG. 14 (h) is a flowchart showing the processing procedure of the first embodiment of the present invention, and FIG. 15 is a flowchart showing the processing procedure of the second embodiment of the present invention. FIG. 16 is a flow chart showing the processing procedure of the third embodiment of the present invention. B: Light receiving part, B ... Integral calculation part, HA, TO, N ... Continuous light memory, D, C, L ... Flash light intensity memory,
E …… Exposure time setting section, F, R, W …… Exposure amount calculation section,
W ... Display.

Continuation of the front page (56) References JP-A-56-149022 (JP, A) JP-A-53-83739 (JP, A) Practical application Sho-57-98438 (JP, U)

Claims (7)

[Claims] 1. A first photometric means for measuring flash light emitted prior to photographing and outputting a photometric value relating to the flash light, and a constant light which is not affected by the amount of flash light for measuring the constant light. Second photometric means for outputting a value, first memory means for storing a photometric value for the flash light output from the first photometric means, and photometry for the stationary light output from the second photometric means Second storage means for storing values, a linear scale on which the photometric values are displayed, and photometric values stored on the first and second storage means are simultaneously displayed at corresponding positions on the scales. A display device for flash measurement, comprising: a display unit that displays the amount of difference between the photometric values as a distance. 2. The display means further includes the first and second display means.
In the flash measurement according to claim 1, the photometric value for the total light obtained by adding the flash light and the stationary light based on the photometric value stored in the storage means is also displayed on the scale. Display device. 3. The display means distinguishably displays the display forms of the photometric values stored in the first and second storage means on the scale, respectively. Display device in the flash measurement described. 4. The display device for flash measurement according to claim 1, wherein the scale has a scale corresponding to an aperture value. 5. The display means displays a photometric value relating to total light at a fixed position on the scale and the photometric values stored in the first and second storage means as a deviation from the fixed position. The display device for flash measurement according to claim 2, wherein 6. A shutter speed changing means, and a correcting means for correcting the photometric values stored in the first and second storage means based on the change by the shutter speed changing means. A display device for flash measurement according to any one of claims 1 to 5. 7. A flash light amount changing means, and a correcting means for correcting the photometric value stored in the first and second storage means based on the change by the flash light amount changing means. A display device for flash measurement according to any one of claims 1 to 5.