JPS6027969B2 - Auto strobe aperture selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strobe used for photography, and particularly to a guide number dial that allows easy determination of exposure conditions for a strobe that can change the amount of light.

It is well known that some strobes automatically control the amount of light depending on the distance to the subject.

It is usually called an auto strobe. It is also well known that this auto strobe can be used as a manual light amount variable strobe by stopping the side light circuit and operating it as a mere time constant circuit, and manually changing the time constant. In the present invention, an auto strobe means one that has the above-mentioned "auto", that is, light intensity control, and "manual", that is, manually variable light intensity. A major problem in putting this automatic strobe into practical use is to make various displays easy to understand when setting shooting conditions, specifically when setting an aperture. For example, in the case of a manual camera, the aperture of the camera is determined by the distance to the subject. For this purpose, the distance scale and the aperture scale may be made to face each other. However, the correspondence relationship varies depending on the sensitivity of the film used, and if the amount of light can be changed manually, depending on the amount of light. Therefore, it is necessary to change the correspondence between the distance scale and the aperture scale depending on the film sensitivity and the amount of light. With a conventional strobe with constant light intensity, you only need to change it depending on the film sensitivity, so 1
It could be easily constructed with two rotatable discs. However, it is not easy to make further changes depending on the amount of light. On the other hand, even when set to auto, the specified aperture must be displayed.

The designated aperture here means an aperture that is predetermined in order to obtain proper exposure for the auto strobe.
The simplest auto strobe has only one designated aperture. In that case, the specified aperture similarly changes only depending on the film speed, so it is sufficient to indicate it with an arrow, etc. However, if the specified aperture can be selected arbitrarily, it is difficult to indicate which arrow Users were confused and often made mistakes because they did not know what to do. The present invention has been made to improve these points.

Therefore, in the present invention, a scale board with various scales arranged is movably arranged on the bottom surface, and a display board having windows at positions corresponding to each scale for displaying these scales is arranged on the top surface. And in between, in conjunction with mode switching,
It consists of an intermediate plate arranged so that only necessary scales are displayed from each window of the display plate. The scale plate has a first scale plate having a sensitivity scale on which film sensitivity numbers are arranged, an aperture scale on which aperture values are arranged, a distance scale on which distance numbers are arranged, and a light amount scale for displaying light amount. It consists of a second scale plate. The distance scale and the aperture scale are placed at opposing positions, and both the first scale plate and the second scale plate are arranged to be movable independently of each other. The movement of the second scale plate acts as a means for changing the amount of light of the autostroboscopic flash. More specifically, a variable resistance is moved to change the time constant in the side light circuit. The intermediate plate is linked to mode switching as described above, and mode switching here means switching the auto strobe to manual or auto, and changing the designated aperture in auto. In order to link the intermediate plate and mode switching, movable filters with different densities are placed in front of the light-receiving element of the side light circuit, and the filters are moved by the intermediate plate to control the light incident on the light-receiving element. The easiest way is to do this. Of course, electrical switching such as changing the integration time constant of the light receiving circuit may also be used. The illustrated embodiment will be described below.

FIG. 1 shows a first scale plate 1, in which a sensitivity scale 2 and an aperture scale 3 are arranged linearly on the surface of a rectangular plate. A projection 4 is provided at the right corner of the first scale plate 1, which serves as a knob for moving the scale plate. FIG. 2 shows a second scale plate 5, which is a plate having a notch on the lower left side, and a distance scale 6 and a light amount scale 7 are arranged linearly on the surface thereof. A protrusion 8 is provided that serves as a knob when moving to the notch. This first scale plate 1 and the second scale plate
The scale plate 5 is arranged so that the side faces of the aperture scale 3 and the distance scale 6 are in contact with each other, and are movable independently in the direction in which the scales are arranged. The display plate 9 in Fig. 3 is fixed to the auto flash body, and when the first and second scale plates are arranged as described above, only that one number is displayed in the area where the light intensity scale 7 is located. A light amount display window 10, which is similarly formed in an elongated manner so that the entire area can be displayed at the position of the distance scale 6, and an aperture display that can display the entire area at the position of the aperture scale 3. window 12
, a sensitivity window 13 that displays one number at the position of the sensitivity scale 2, and a mode display window 14 that displays one of the marks provided on the intermediate plate 18, which will be described later, to indicate mode switching. A first guide hole 15 that guides the movement of the protrusion 4, a second guide hole 16 that guides the movement of the protrusion 8, and a window that guides the movement of the protrusion 19 provided on the intermediate plate 18. A third guide hole 17 serving as a guide is provided.

The intermediate plate 18 is configured to move in a direction perpendicular to the moving direction of the scale plates 1 and 5 by the protrusion 19 and the third guide hole 17. During this movement, as shown in FIG. 7, a filter 21 provided on the front surface of the light receiving element 20 moves to switch the mode. Marks M and A are displayed on the mode display window 14 to indicate the switched state.
, A, A are provided in a single row. M means manual, three A's represent auto, and each indicates a different designated aperture. Therefore, it is desirable that each A has a different color. The intermediate plate 18 may display each scale of the scale plates 1 and 5 in each window of the display plate 9 as necessary.
Holes and cutouts are formed for hiding purposes. First, a light amount hole 22 and a distance hole 23 are provided at positions that correspond to the light amount display window 10 and distance window 11 when the mark M of the intermediate plate 18 is seen from the mode display window 14, and a portion that corresponds to the aperture window 12. is cut out. Between this cutout part and the distance hole 23, there are three holes 24, 25, 26 for displaying only one number on the aperture scale when each A is seen from the mode display window 14. It is provided. As is clear from the figure, the hole 24 corresponds to the A next to M, the hole 25 corresponds to the next A, and the hole 26 corresponds to the last A. The positions of the respective holes are such that when the number 100 is visible from the sensitivity window 13, the aperture values of 11 are visible for the hole 24, 5 and 6 for the hole 25, and 2 and 8 for the hole 26. Further, the upper part of each hole is colored, and the distance indicating the photographable range is displayed below each hole and between the hole and each mark A. The operation of this embodiment will be described below.

When the scale plates 1, 5, intermediate plate 18, and display plate 9 are stacked one after another, the result is as shown in FIGS. 5 and 6. FIG. 5 shows a case where the protrusion 19 is moved so that M can be seen from the mode display window 14. At this time, the filter 21 shown in FIG. 7, which does not allow any light to pass therethrough, is placed in front of the light receiving element 20, and the neck light circuit becomes inoperable. At this time, each hole and notch of the intermediate plate corresponds to each window of the display plate 9, and all scales are displayed. Therefore, as shown in the figure, since the distance scale 6 and the aperture scale 3 are provided facing each other, the aperture can be read from the distance to the subject. When using films with different sensitivities, it is only necessary to move the first scale plate by means of the protrusion 4 so that the number appearing in the sensitivity window 13 matches the sensitivity of the film. This movement also moves the diaphragm scale 3 to match the distance scale 6 and its sensitivity. Also, when you want to change the amount of light, move the protrusion 8 and select the desired amount of light by looking at the number that appears in the light amount display window 101, and the time constant of the time constant circuit will change as described above to determine the required amount of light. Since it starts emitting light and moves the distance scale 6 in conjunction with the operation, it is possible to obtain the relationship between the distance and the aperture according to the amount of light. In this way, since the scale plate is divided into two parts, with the aperture scale on one side and the distance scale on the other, it is possible to appropriately respond to changes in film sensitivity and light stars. However, the user must
Move the protrusion 8 so that the desired amount of light appears from 0,
In addition, it is extremely simple and does not cause any confusion since it is only necessary to make sure that the same number as the sensitivity of the film used appears in the sensitivity window. Next, when using auto, intermediate plate 1
8 from the mode display window 14 so that the mark A can be seen.

Then, the light is appropriately incident on the light receiving element 20 by the filter 21, and the leakage light circuit comes to operate. By this movement of the intermediate plate 18, all windows of the display panel 9 except the sensitivity window 13 are closed. However, the aperture display window 12 has a hole 2.
Any number from 4 to 26 is entered, and only one aperture number is visible. That is, when using the camera in auto mode, only one aperture value of the film's sensitivity can be seen from the display panel 9, and nothing else can be seen. Therefore, you can immediately know the specified aperture of this auto strobe from the visible aperture counterfeit. When changing the specified diaphragm, it is sufficient to make the projections 19 make the different colors A visible. Since the aperture scale and the sensitivity scale are provided on the same scale plate, if you match the sensitivity scale to the sensitivity of the film you are using, the corresponding aperture will be displayed. In any case, only one aperture is visible, so
The user can know the designated aperture without any confusion. Even if you change the film speed, only one number is visible.
Since the number can be changed by moving the protrusion 19, there is no confusion at all. In this embodiment, when set to auto, colors appear above each window in the aperture display window 12 where the specified aperture appears, and the photographing limit distance is displayed below.

Since the positions of the holes 24, 25, and 26 in the intermediate plate are different, it can be understood that when the designated aperture is changed by moving the protrusion 19, the length of the color is different and the photographic limit is different. Furthermore, the distance display provided at the bottom allows you to know the maximum photographing distance for that specified aperture.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the first scale plate, Fig. 2 is a plan view of the second scale plate, Fig. 3 is a plan view of the display plate, Fig. 4 is a plan view of the intermediate plate, Fig. 5, FIG. 6 is a plan view of an embodiment of the present invention that combines these elements, and FIG. 7 is a sectional view of a portion of an autostrobe using this embodiment. 1: First scale plate, 2: Sensitivity scale, 3: Aperture scale, 6: Distance scale, 7: Light intensity scale, 9: Display plate, 10: Light intensity display window, 11: Distance window, 12: Aperture display window, 13 : Sensitivity window, 1
4: Mode display window, 18: Intermediate board. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. An auto strobe aperture value selection device comprising the following (a) to (d). (a) It has a sensitivity scale in which numbers representing film sensitivity are arranged in a row, and an aperture scale in which numbers representing aperture are arranged in a row parallel to the sensitivity scale, and each scale is movable in the direction of the row of numbers. The attached first scale plate (b) has a light intensity scale in which numbers representing light intensity are arranged in a row, and a distance scale in which numbers representing distance are arranged in parallel to the light intensity scale, and each scale of the first scale plate is a second scale plate (c) which is attached movably in the same direction as the first scale plate so that the row of numbers and the row of numbers of each of the scales are parallel to each other; and the first and second scales juxtaposed. A sensitivity window that covers the plate and displays one number on the sensitivity scale, a light intensity display window that displays one number on the light intensity scale, a distance window that displays the distance scale, and an aperture display that displays the aperture scale. A display board that has a window and is fixedly attached (
d) Located between the first and second scale plates and the display plate, which is interlocked with mode switching, whose movement is perpendicular to the direction of movement of the first and second scale plates, and whose movement , Intermediate plate that displays only one number on the aperture scale from the aperture display window when automatic, and displays the distance scale in the distance display window and the aperture scale in the aperture display window when manual.