JPS6015933B2 - Simple camera exposure adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exposure adjustment device for a simple camera such as a so-called pocket camera.

Many conventional simple cameras of this type have a distance mark and an aperture mark that can be selected in order to easily set the distance and aperture.

However, conventional simple cameras of this type are not compatible with the ASA sensitivity of film, and the photographer
Either the aperture mark should be selected taking the A sensitivity into consideration, or if the sensitivity is high, the sensitivity should be lowered by taking advantage of the outside of the fill, but in either case, there is a problem in that the characteristics of high sensitivity cannot be effectively utilized. The present invention has been made in view of the above-mentioned conventional problem, and it is possible to automatically switch both the distance mark and the aperture mark according to the ASA sensitivity of the film, and the photographer can change the distance mark and the aperture mark according to the ASA sensitivity of the film. It is an object of the present invention to provide an exposure adjustment device with a simple structure that can set a necessary distance and aperture within a range automatically set.

The exposure adjustment device for a simple camera according to the present invention includes a distance adjustment means, an aperture setting means, a distance mark indicating means, an aperture mark indicating means, and an ASA switching means. The diaphragm setting means according to the present invention is actuated by the distance adjusting means, and the diaphragm is maximized at the neutral position, and can be made to narrow the diaphragm in the same way when operated in either direction opposite from the neutral position.

In the present invention, unidirectional aperture operation is used for outdoor light photography,
Aperture operation in the other direction is used for flash photography. The distance mark indicating means and the aperture mark indicating means according to the present invention each have distance marks arranged in order of distance and aperture marks arranged in order of aperture flea, and are arranged in two windows formed in a camera case. Display each mark respectively.

The ASA switching means according to the present invention, for example, uses a concave portion or a convex portion provided in the film cartridge to
The SA sensitivity is detected, and the distance mark indicating means and the aperture mark indicating means are respectively displaced in accordance with the detected ASA sensitivity.

This displacement by the ASA switching means changes the number of distance marks and aperture marks displayed from the window, and in the case of high sensitivity, the number of distance marks and aperture marks that can be selected increases. The exposure adjustment device for a simple camera according to the present invention constitutes a kind of flashmatic mechanism.

In other words, since the aperture can be set in two steps, one step of the aperture can be used for flash photography, and the aperture can be adjusted by setting the distance, and the range of linkage between distance and aperture can be adjusted according to the ASA sensitivity. can be changed. EMBODIMENT OF THE INVENTION The present invention will be described in more detail below with reference to illustrated embodiments.

In FIG. 1, when A is operated a knob 2 provided on a part of a relatively long lever 1 in the left-right direction of the figure, it engages with a pin 3 protruding from the left end. The lens barrel 5 is rotated via a fork-shaped linking means 4, and a cam groove 7 provided in the lens barrel 5 is guided by a cam pin 6 fixed to the camera body to adjust the amount of movement of the photographic lens 8. This is a distance adjusting means that determines the distance and focuses based on this.

In this case, the portion of the cam groove 7 that corresponds to the rotation range of the photographing lens 8 during external light photography is not specifically shown in the drawings so that the total amount of the photographing lens 8 is zero during external light photography. Although not shown, it is set as a circular arc perpendicular to the axis of the lens barrel 5. In other words, in the above rotation range, the lens mirror 5 is rotated relative to the cam pin 6, but is not displaced in all directions of the axis. However, depending on the case, the above-mentioned portion of the cam groove 7 may be slightly bent in the axial direction so that the distance can be slightly finely adjusted in accordance with the aperture. B is an aperture setting means, which consists of a pair of aperture plates 11 and 12 having aperture opening holes 9 and 10 of the same shape, respectively, and a central portion 13a is rotatably supported by a shaft 14 parallel to the optical axis. The aperture actuating lever 13 is placed at a position equidistant from the ball 14 from the ends 11a and 11a of the aperture plates 11 and 12 on the same side.
12a are connected and supported by connecting pins 15 and 16, respectively.

The diaphragm actuating lever 13 supports a linking rod 17 parallel to the optical axis direction at its upper end, and the tip of the linking rod 17 is connected to the ear portion 18 supported downwardly at the substantially central portion of the bar 1 as described above.
The diaphragm actuating lever 13 is rotated around the diaphragm 14 in conjunction with the operation of the knob 2, and the diaphragm plates 11 and 12 are moved oppositely in the left and right direction. The aperture diameter is set by displacing the aperture apertures 9 and 10 by a distance equal to the direction in which the apertures 9 and 10 overlap. The state shown in the figure shows the leftward displacement position of the aperture operating lever 13 where the aperture diameter is at its minimum, and the operating lever 13 moves from the neutral position to either the hour hand U or the rebounding hand V of the shaft 14. Even when rotated in the direction of
A pair of aperture plates 11 and 12 are operated to narrow down the aperture diameter. As mentioned above, the aperture mechanism B allows for two-stage aperture.
By setting , one aperture operation can be used for flash photography and the other aperture operation can be used for outdoor light photography, so the lever 1 operated by the knob 2 has a ma mark indicating flash photography and a plein air photography. Marks indicating ▼ are marked at appropriate intervals so that, for example, during flash photography, a distance mark (described later) can be selected using the mark.

On the other hand, 20 and 21 indicated by dashed lines in the figure are windows for displaying a distance mark and an aperture mark, respectively, provided on the camera case. Distance marks a, b, c and aperture marks (weather marks) 1, m, n are displayed on the right ends of the distance mark display lever 22 and the aperture mark display lever 23, which are movably superimposed on each other. .

The distance marks a, b, and c are arranged in order of distance from the farthest object to the right end, and the aperture marks ], m, and n are arranged in order of increasing EV value from the right end.

The distance mark display lever 22 and the aperture mark display lever 23 are provided with ASA sensitivity switching means C for displacing and switching these levers 22 and 23 in mutually opposite directions according to the ASA sensitivity of the film.

This ASA sensitivity switching means C is an ASA sensitivity switching means provided in a double batrone type film cartridge (not specifically shown).
It operates by detecting the presence or absence of a protrusion for sensitivity detection when the cartridge is loaded.

More specifically, the ASA sensitivity switching means C has a detection end 25a for detecting the presence or absence of a convex portion of the cartridge, and a detection rod 25 protruding in a direction perpendicular to the bars 22 and 23 described above; a rotary lever 26 that moves the distance mark display lever 22 in one direction by changing the displacement direction of the detection rod 25 by 90 degrees in conjunction with the detection rod 25;
Similarly, it is comprised of two rotary levers 27 and 28 that are linked to the detection rod 25 and are linked to each other so as to displace the aperture mark display lever 23 in a direction opposite to the distance mark display lever 22. When the cartridge containing ASAIOO film is loaded into a predetermined position in the camera, when the detection rod 25 is pressed in the direction of the arrow in the figure by the detection protrusion indicating ASAIOO, the rotation lever 26 is moved in the horizontal plane. The distance mark display lever 22 is rotated by a certain angle counterclockwise in the direction of the hour hand, and the engaging portion 22b at the left end of the distance mark display lever 22, which is supported from the right side in the figure, is pushed against the rising edge 26a provided at one end in the right direction Y in the figure, thereby displacing the entire lever 22. , window 2
The distance marks displayed externally from 0 are two marks b and c corresponding to medium and short distances.

On the other hand, the aperture mark display lever 2 is interlocked with the detection rod 25 via two mutually interlocking rotary levers 27 and 28.
3 is displaced in a direction that is 2700 degrees different from the movement of the detection rod 25 in the arrow direction, in other words, in a direction Z that is opposite to the displacement direction Y of the distance mark display lever 22, and as a result, the current Let us assume that the aperture marks viewed from one window 21 are two aperture marks with large EV values, m.

Next, the operation of the above configuration will be explained. '11
Flash Photography In the case of ASA400 In this case, as shown in Figure 2 A, each window 20, 21
, distance marks a, b, c and aperture mark, respectively.
All of m and n are displayed, and the photographer operates knob 2 to match the ma-mark with one of the three distance marks a, b, and c displayed according to the subject distance, and then Accordingly, the distance and the aperture diameter corresponding to the distance can be set by the aperture setting means B.

[o) For ASAIOO In this case, the distance mark display lever 22 and the aperture mark display lever 23 are switched by the ASA switching means C at the same time as the film cartridge is loaded, and from the window 20, the distance mark display lever 22 and the aperture mark display lever 23 are switched corresponding to short distance and medium distance. Distance marks b and c are displayed.

'21 Outdoor Light Photography In this case, the aperture marks, m, and n are selected using the ▼ marks, and as shown in Figure 3 for the ASA400, when the knob 2 is moved significantly to the right, The diaphragm can be set by matching the ▼ mark with any one of the diaphragm marks -, m, and n displayed from 21.

Note that the case of external light photography using ASAIOO film is not shown in the drawings, but since it is the same as that shown in Figure 2 except for the difference in marks, the explanation will be omitted.

As is clear from the detailed description above, the present invention is capable of automatically switching the selection range of the distance mark and aperture mark depending on the film sensitivity level, and furthermore, the aperture diameter can be changed from close to fully open to aperture. We have provided an aperture setting means that can be used in three stages, such as 3 steps, so that external light photography and flash photography can be performed using the distance adjustment means itself. It is an object of the present invention to provide an exposure adjustment device with a simple structure that allows switching of shooting conditions and setting of distance and aperture at the same time by mutual selection. It is possible to provide a simple camera that can easily perform even flash photography.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an exposure adjustment device showing an embodiment of the present invention, and FIG.
Figure 3 is an explanatory diagram illustrating distance selection when using a flash corresponding to O.
Figure A is an explanatory diagram similar to the mouth. A. ...Distance adjustment means (1...Lever,
2...knob, 3...pin, 4...
- Engagement means of Zenicho 5, 6. ...Kampin, 7.
...cam groove), B...aperture setting means (1
1, 12...Pair of aperture plates, 13...Aperture operating lever, 17...Linking rod), 20,2
1...Window, 22...Distance mark display lever, 23...Aperture mark display lever, C...
...ASA switching means (25...ASA detection rod, 26, 27, 28... rotary lever).
Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 Distance adjustment means 1, 2, 3, 4, 6, and 7 for fixing the photographing lens system in the optical axis direction during external light photography and adjusting the focus by displacing the photographing lens system in the optical axis direction during flash photography; Setting means 11, 12, 13, and 17 are provided which are operated by the distance adjusting means to narrow down the aperture diameter for displacements in any of the opposite directions from the neutral position corresponding to the maximum aperture diameter. Displacement aperture operation is used for outdoor light photography,
Displaceable distance mark indicating means 22 in which a plurality of distance marks are marked in the order of distance so that the aperture operation in the other direction is used for flash photography, and a first window 20 formed in the camera body case is marked; A movable aperture mark indicating means 23 in which a plurality of aperture marks are marked in order of aperture diameter so as to be exposed to a second window 21 opened in the main body case, and a distance mark display means and an aperture mark display according to the ASA sensitivity of the film. ASA switching means 25 for respectively displacing the means in opposite directions with respect to the neutral position of the aperture setting means;
, 26, 27, and 28, and the selection range of the aperture mark during flashing is increased in the case of high-sensitivity film compared to the case of low-sensitivity film. .