JP2516613Y2 - Electronic flash device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an exposure information display device of an electronic flash device for displaying exposure information such as film sensitivity and dimming F value.

(Prior Art) Conventionally, as an exposure information display device of an electronic flash device, as shown in FIG. 7, for example, a number indicating an F value is displayed in a display window 1 and this number is supported by an index 2. Due to
The F value supported by the index 2 is the dimming F value by external dimming (here, the dimming F value is the aperture value of the lens that is the proper exposure determined by the dimming control circuit of the electronic flash device. There is something that indicates that it is. Therefore, the photographer may set the aperture value of the lens on the camera side to the same value as the displayed dimming F value based on the display by this display device.

(Problems to be solved by the invention) However, in the above-mentioned conventional example, for example, when a film having an ISO speed (film speed) of 100 is used, the index 2 indicates the numeral 8 and the dimming F value is F8. If there is an indication that there is an intermediate sensitivity film, for example, ISO sensitivity of 6
When the film of 4 is used, the dimming F value is F5.6 + (1/3
However, as shown in Fig. 7, the indicator 2 actually points between the numbers 8 and 5.6, so the display is difficult to understand. Therefore, the photographer has a dimming F value of F5.6.
There is a problem in that it may be erroneously recognized as, and when so-called exposure compensation is applied, if the dimming F value is difficult to understand as shown in FIG. The aperture value cannot be easily known. Therefore, there is a problem that exposure compensation is difficult to apply.

Further, when data such as film sensitivity and F value is transmitted between the conventional electronic flash device and the camera, namely, (1) the dimming F value is transmitted from the electronic flash device side to the camera side as an electric signal, If you try to control the aperture value of the lens on the camera side based on this signal, the aperture value of the lens is determined by the electronic flash device, so malfunction may occur when the camera is set in a mode in which the aperture cannot be controlled. (2) Conversely, the aperture value set on the camera side is transmitted to the electronic flash device side as an electric signal, and the dimming F value is determined based on this signal, and the electronic flash light is determined. When the device controls dimming, for example, the dimming F value is 5EV
Then, if there is no dimming F value in at least 1/3 EV step, an exposure error will occur, so it is necessary to have a dimming F value of 13 steps or more, that is, unless a large number of dimming F value steps are prepared. In addition, there is a problem in that it is difficult to apply the exposure correction because the aperture value of the lens to be set cannot be easily known when the exposure correction is applied in the same manner as described above.

The present invention has been made in view of such a conventional problem, and is an electronic flash device capable of easily displaying exposure compensation and displaying a dimming F value in an easy-to-understand manner even when a film having an intermediate sensitivity is used. It is an object to provide an exposure information display device.

(Means for Solving Problems) The gist of the present invention for achieving such an object is to provide a first display section 11 for displaying film sensitivity and a second display for displaying an aperture value to be set or set. An exposure information display device 10 of an electronic flash device, comprising: a portion 12; and a third display portion 13 for displaying an exposure deviation corresponding to a difference between the aperture value and the dimming F value as an exposure correction amount. Exist in.

(Operation) In the exposure information display device 10 of the electronic flash device, when the exposure correction is performed, the exposure correction amount set by the photographer is displayed on the third display unit 13. Even when a film having an intermediate sensitivity is used, the exposure deviation corresponding to the difference between the aperture value and the dimming F value displayed on the second display unit 12 is displayed on the third display unit 13 as the exposure correction amount. , The display is easy to understand.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

 1 to 6 show an embodiment of the present invention.

As shown in FIGS. 1 to 4, the exposure information display section 10 of the electronic flash device according to one embodiment is made of a liquid crystal display element, and the exposure information display 10 has an ISO sensitivity (film sensitivity).
And a second display unit 12 for displaying the aperture value (F value) that should be or has been set on the camera side.
And a third display unit 13 that displays the exposure shift corresponding to the difference between the aperture value and the dimming F value as the exposure correction amount.

In the first display section 11, an ISO character 11a is displayed and a numeral 11b indicating the ISO sensitivity is also displayed on the liquid crystal display.

In the second display portion 12, an F / symbol 12a is displayed and a numeral 12b indicating the F value is also displayed on the liquid crystal.

An exposure correction mark 13a is displayed in the third display portion 13, and a + and-mark 13 indicating the sign of the exposure correction is displayed.
b and the number 13c indicating the exposure correction amount are respectively displayed on the liquid crystal display.

FIG. 5 shows a block diagram of an LCD drive circuit for driving the exposure information display section 10.

As shown in FIG. 5, the CPU of the LCD drive circuit has an ISO
Sensitivity input section 30, F value input section 40 and exposure correction amount input section 50
Is connected.

The ISO sensitivity input section 30 is the ISO sensitivity set by the electronic flash device, or the ISO sensitivity transmitted from the camera side when transmitting data such as film sensitivity and F value between the electronic flash device and the camera. Is output to the CPU 20.

The F-number input unit 40 receives the data of the F-value for light control, or the F-number data transmitted from the camera side when transmitting data such as film sensitivity and F-number between the electronic flash device and the camera. It is output to the CPU 20.

The exposure correction amount input section 50 outputs the data of the exposure correction amount set by the exposure correction means (not shown) on the electronic flash device side or the camera side to the CPU 20.

The CPU 20 calculates display data from the input data and outputs it to the LCD driver 60. The LCD driver 60 drives the exposure information display section 10 based on the display data from the CPU 20.

Next, the operation of the LCD drive circuit will be described based on the flowchart shown in FIG.

First, the CPU 20 changes the ISO sensitivity input section 30
The ISO sensitivity data is read in step, the light control F value data or F value data from the F value input unit 40, and the exposure correction amount data from the exposure correction amount input unit 50 is read in step. At this time, each data of the ISO sensitivity, the light control F value, and the exposure correction amount read by the CPU 20 is set to, for example, ISO64, F5.6 +
(1 / 3EV), ± 0.

Next, the CPU 20 calculates the read data and creates display data.

First, in step S20, the CPU 20 "rounds" the F value in order to calculate the F value displayed on the second display unit 12. This "Marume" means the aperture value for each EV step engraved on the read dimming F value data, that is, the value of (√2) n (n is a positive integer) It should be the closest value. In this case, since the light control F value data is F5.6 + (1 / 3EV), the F value displayed on the second display unit 12 is rounded to F5.6.

Next, the CPU 20 calculates the exposure correction amount displayed on the third display unit 13 in step. The calculation here is the EV value of the error caused by the "rounding" of the F value [the dimming F value (or the set aperture value) -the value of the rounded F value (F ') represented by the number of steps], This is done by adding the EV value of the set exposure compensation amount, and the calculation result is A. In this case, the dimming F value is F5.6 + (1 / 3EV), the rounded F
Since the value (F ') is F5.6 and the set exposure compensation amount is ± 0, the CPU 20 calculates 5.6+ (1 / 3EV) -5.6 + 0 = 1 / 3EV.

The display data created by the CPU 20, that is, the ISO sensitivity value, the rounded F value (F ′), the dimming F value, and the calculated exposure correction amount are output to the ICD driver 60.

The LCD driver 60 drives the exposure information display unit 10 according to the display data from the CPU 20. Ie in steps
The ISO sensitivity (64) is displayed on the first display unit 11, and the F value (F ') (F5.6) rounded by the step is displayed on the second display unit.
Then, the exposure compensation amount (+1/3) calculated in step is displayed on the third display 13. A display example in this case is shown in FIG.

Various display examples by the exposure information display unit 10 will be described below with reference to FIGS. 1 to 4.

(1) First, a display example of the exposure information display unit 10 of the electronic flash device when the electronic flash device is not connected to the camera will be described. Here, it is assumed that the electronic flash device has only F8 as the external dimming F value at ISO sensitivity 100.

In the display example shown in FIG. 1, the first display unit 11 has been set.
The ISO sensitivity is 100, the second display 12 has an F value of 8.0, and the third display 13 has an exposure correction amount of ± 0.
Shows that there is no deviation in the exposure. At this time, it is assumed that the exposure correction amount set by the exposure correction means (not shown) on the electronic flash device side is zero.

From the display of the exposure information display section 10 shown in FIG. 1, the photographer finds that the dimming F value when the ISO sensitivity is 100 is F8.0, and if the lens aperture value is set to F8.0, the proper exposure is obtained. It is easy to understand that is selected.

FIG. 2 is a display example when a film having an ISO speed of 64 is used as a medium speed film.

In the display example shown in FIG. 2, the first display unit 11 is set.
ISO sensitivity is 64, second display 12 has F value of 5.6, and third display 13 has exposure compensation amount of + 1 / 3E
It is V and shows that there is a deviation in exposure by +1/3 EV. Also at this time, it is assumed that the exposure correction amount set by the exposure correction unit (not shown) on the electronic flash device side is zero.

From the display on the exposure information display section 10 shown in Fig. 2, the photographer can easily understand that if the aperture value of the lens is set to F5.6 when the ISO sensitivity is 64, the exposure will be over 1/3 EV. It can be easily understood that the dimming F value is F5.6 + (1 / 3EV).

In the display examples shown in FIGS. 1 and 2, the aperture value is
Each EV is displayed on the second display unit 12, and the exposure shift, which is the difference between the aperture value of the lens and the dimming F value at that time, is displayed on the third display unit 13 as the exposure correction amount. The display is very easy to see even when using a sensitive film.

The display examples shown in FIGS. 3 and 4 show the case where the exposure correction amount is set by the exposure correction means (not shown) such as an exposure correction dial provided on the electronic flash device side, and the exposure correction is performed. It is a thing.

FIG. 3 is a display example when exposure compensation of +1 EV is applied. In this display example, the exposure correction amount set by the exposure correction means is displayed on the third display unit 13, and the aperture value of the lens to be set is displayed on the second display unit 12. Therefore, from the display shown in FIG. 3, the photographer can easily understand that in order to apply the exposure compensation of + 1EV, the aperture value of the lens should be set to F5.6.

Similarly, FIG. 3 is a display example when the exposure correction of −2EV is being applied. From the display shown in FIG. 4, the photographer
To apply exposure compensation of −2EV, set the lens aperture value to F16.
It is easy to understand that it should be set to.

In this way, when the exposure correction is applied, the exposure correction amount set by the exposure correction means is displayed on the third display unit 13, and the aperture value of the lens to be set at that time is displayed on the second display unit.
Since it is displayed at 12, you can easily apply exposure compensation.

(2) Next, regarding the display example when the electronic flash device is connected to the camera and the data such as the ISO sensitivity and the aperture value of the lens set on the camera side are transmitted from the camera side to the electronic flash device side, A description will be given based on FIGS. 1 to 4. In this case, it is assumed that an electronic flash device having two dimming F values of F8 and F5.6 at ISO sensitivity 100 is used.

FIG. 1 is a display example when the ISO sensitivity and the aperture value of the lens set on the camera side are 100 and F8, respectively.

As shown in FIG. 1, the electronic flash device selects the dimming F value of F8 in accordance with the set aperture value of the lens. At this time, the set lens aperture value and the selected dimming F
Since the difference from the value, that is, the exposure shift is 0, the third display unit 13 indicates that the exposure correction amount is ± 0.

Next, at ISO sensitivity 100, two dimming F of F8 and F5.6
A case where a film having an ISO speed of 64 is used in an electronic flash device having a value will be described. When the ISO temperature is set to 64 in this electronic flash device, there are two dimming F values, F5.6 + (1 / 3EV) and F4 + (1 / 3EV).

FIG. 2 shows a display example when the ISO sensitivity and the lens aperture value set on the camera side are 64 and F5.6, respectively.
As shown in Fig. 2, in the electronic flash device, the lens aperture value is set to F5.6 on the camera side, so F5.6 + (1 / 3EV)
The dimming F value of is selected and displayed. At this time, the difference between the aperture value of the lens set on the camera side and the selected dimming F value, that is, the exposure shift is +1/3 EV, so the third
The display unit 13 displays that the exposure compensation amount is +1/3.
If the aperture of the lens is reduced by 1 / 3EV in this state, there will be no difference between the aperture value of the lens and the dimming F value, and the third display unit 13
Is displayed as ± 0 as in the case of FIG. In this way, by setting the aperture value of the lens so that the display of the third display unit 13 becomes ± 0, it is possible to easily obtain an appropriate exposure even when a film having an intermediate sensitivity is used.

FIG. 3 shows a display example when exposure compensation is applied using the exposure compensation means on the electronic flash device side.

As shown in FIG. 3, the ISO sensitivity and the aperture value of the lens set on the camera side are 100 and F5.6, respectively, and the electronic flash unit selects the dimming F value of F5.6. In this state,
When the exposure correction means of the electronic flash unit performs exposure correction of +1 EV, the F value displayed on the second display unit 12 is
With F5.6 as it is, the electronic flash device selects the dimming F value of F8,
The third display unit 13 displays the exposure correction amount of +1 as the exposure deviation. In this way, since the exposure correction amount is displayed on the third display unit 13, it is possible to easily perform difficult exposure correction.

FIG. 4 shows a display example when the aperture value of the lens is set to a value different from the dimming F value.

In the display example of FIG. 4, although the dimming F value of the electronic flash device is F8, the aperture value of the lens is set to F16. At this time, since the exposure deviation is −2 EV,
The display unit 13 displays -2 as the exposure correction amount.

In this way, the exposure shift is displayed on the third display unit 13 as the exposure correction amount. Therefore, if the photographer mistakenly sets the aperture value of the lens, the photographer must obtain the proper exposure. It can be easily known from the display of the third display unit 13 which one of the lens aperture values should be moved and how much the lens aperture value should be moved, and exposure compensation can be easily applied when the photographer intends. .

(3) Next, the electronic flash device is connected to a camera whose aperture can be controlled by a signal from the outside, the electronic flash device side transmits an aperture value signal to be set to the camera side, and the camera side is based on this signal. A display example in the case of trying to control the aperture value of the lens will be described with reference to FIGS. 1, 3, and 4. In this case, the electronic flash device has a dimming F value of F8 and is provided with the exposure correction means.

Similar to the above case, FIG. 1 shows a display example when the ISO sensitivity is 100, the second display section 12 shows that the dimming F value is F8.0, and the third display section 13 shows The exposure correction amount is ± 0. At this time, the aperture value signal of F8 to be set is transmitted from the electronic flash device side to the camera side, and the camera side controls the aperture value of the lens to F8 based on this signal.

FIG. 3 and FIG. 4 are display examples when exposure compensation is applied by the exposure compensation means on the electronic flash unit side.

Figure 3 shows a display example when exposure compensation of ± 1 EV is applied.
By applying this correction, the second display unit 12 displays F5.6, and the aperture value signal of this F5.6 is transmitted from the electronic flash device side to the camera side, and the lens side is transmitted by the camera side based on this signal. The aperture value of is controlled to F5.6. At this time, since the exposure correction amount of +1 is displayed on the third display unit 13, the exposure correction can be easily performed.

Similarly, FIG. 4 is a display example when the exposure correction of −2EV is applied, and by applying this correction, the second display unit 12
F16 is displayed, and the aperture value signal of F16 is transmitted from the electronic flash device side to the camera side, and the camera side controls the aperture value of the lens to F16 based on this signal. At this time, since the exposure correction amount of −2 is displayed on the third display unit 13, the exposure correction can be easily performed.

In the above example, if there is no exposure deviation,
Although the exposure correction amount of ± 0 is displayed on the third display unit 13, if there is no deviation in the exposure, the third display unit 13 does not display anything,
The third display unit 13 may be configured to display the exposure correction amount only when the exposure shift occurs. In that case, the photographer can be reminded by the display of the exposure correction amount, which is more effective.

Further, although the digital value is displayed in the above embodiment, it goes without saying that the display may be made with an analog value or a bar graph.

(Advantages of the Invention) According to the exposure information display device of the electronic flash device of the present invention, when the exposure correction is applied, the exposure correction amount set by the photographer is displayed on the third display unit. It is easy to apply, and even when using a film with intermediate sensitivity,
Since the exposure shift corresponding to the difference between the aperture value and the dimming F value displayed on the second display unit is displayed on the third display unit as the exposure correction amount, the display is easy to understand.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIGS. 1 to 4 are explanatory views showing various display examples by an exposure information display device of an electronic flash device, and FIG. FIG. 6 is a block diagram showing an LCD drive circuit for controlling the exposure information display device, FIG. 6 is a flow chart for explaining the operation of the LCD drive circuit of FIG. 5, and FIG. 7 is an explanatory diagram showing a conventional display example. 10 ... Exposure information display device, 11 ... 1st display part 12 ... 2nd display part, 13 ... 3rd display part

Claims (1)

(57) [Scope of utility model registration request] 1. A first display section for displaying a film sensitivity, a second display section for displaying an aperture value to be set or set, and an exposure according to a difference between the aperture value and a dimming F value. An exposure information display device for an electronic flash device, comprising: a third display unit for displaying a deviation as an exposure correction amount.