DE1945455U - DEVICE FOR DETERMINING THE FLASH RECORDING AREA IN CAMERAS. - Google Patents

Description

L 378 97 6 * 7/20/66

Essen, July 18, 1966 (26 764 / La / th)

PATENT ADVERTISEMENT

Dr. Andreevsky
43 Essen, KettwigerStt. 36

(Arn Hauptbahnhof-UÄtburg)
^ Telephone 25802

Utility model registration of the company
Minolta Camera Kabushiki Kaisha
Toyoda Building, 18, Shiocho-dori
4-chome, Minami-ku, Osaka / -Japan-

Vorrlohtung to Peststellung of B _r litzaufnahmebereiches in cameras.

The innovation relates to a device for plaguing the Flash recording area in cameras whose distance setting is linked to the aperture.

According to the innovation, such a device is intended for the photographer Provide tangible and audible information as to whether the camera setting is correct for an intended flash exposure was made.

With flash photography, the one for a correct one is generally used Exposure of the inserted film required aperture value F by essentially of the type of flash and of the film used depending on the guide number G and the Distance D to the object according to the equation

An apparatus which satisfies this equation (1) had to be therefore taking these three factors F, G and D into account result in a usable flash exposure area.

If you now assume that for the normally useful The smallest aperture for a guide number G. F min and the largest aperture is E max, as well as the shortest / permissible distance D min and the greatest permissible distance D max, the following relationships result: -.,

F min ■ * = F ■ == F max (2) /

D min <r D · < D max (3)

These relationships are special cases of equation (1), at to which this equation is only applicable in the area of relationships (2) and (3) is satisfied.

We already know cameras> their shutter with the aperture is coupled, which, however, has no indication of a necessary readjustment of the distance setting ring: have, though, at the actual setting of this ring the aforementioned equation (1) is only partially fulfilled in reality. The lack of information from the photographer whether in in this case, the conditions of relationships (2) and (3) the

Satisfying equation (1) or not can therefore result in a result in completely unusable flash exposure.

In the cameras of the aforementioned type '' _: ", '_ \ which are common nowadays, the distance ring is rotated so far that the relationships (2) and (3) in equation (1) with respect to a fixed guide number G If, for example, this guide number G is set to 80 \, for F min = 20 and F max = 1β , then.

the shortest permissible distance is D = ^ = 5 m a normal maximum value of D max = 10 m results in the relationship

5 <: D <10.;:

When the aforementioned distance is 2 m and an object at D - 3 m with a guide number G = 80 can, then this 3 m away object can be used without restriction * - the rotation of the distance ring can be absorbed; however, sometimes unusable flash images result come.

In order to eliminate these possible errors in flash photography, the user should be informed by the device according to the innovation before the shutter is actuated ^ whether the conditions of equation (1) are actually also met by the; Relationships (2) and (3) are met respectively. vice versa. : / ']'.

It is therefore proposed that such a device in the way to train that with the: adjustment ring for the; Removal of engaging ratchet mechanism is provided, which can only be felt and heard to engage when the position of the setting ring fulfills all conditions for perfect flash exposure.

In particular, it is provided that between the guide number ring, and the adjustment ring for the distance one in its movement arranged in such a way controlled by the guide number ring intermediate organ istj that it is only when the setting is correct for flash photography of the distance setting ring comes into engagement with this perceptibly and audibly.

The innovation is described in detail below using two in the attached drawings illustrated embodiments explained .; show it: ;

Figure 1 is a plan view of the main parts of the innovation;

FIG. 2 is a plan view of a modified embodiment;

Figure 3 is a diagram to explain the principle of ₌ innovation. > ■

In the embodiment according to FIG. 1, a first display element 2 for determining the flash receiving area is mounted on the breechblock housing 1 on a pin 4 in such a way that it is rotated clockwise by means of a spring 3. The tip 5 of this organ 2 lies above a first toothing 8 on the adjusting ring J for the removal, which can be rotated about a sleeve 8 concentrically to the lock housing. In addition, the guide number ring 11, which is arranged concentrically around the lock housing, has a cutout 12 with a cam surface 10 on which a pin 9 of the organ 2 rests, whereby the tip 5 of the part 2 is brought into engagement with the teeth 8 of the lock ring 7 or is lifted out of this engagement. In addition, on the lock housing 1 is a second member 13 for determining the receiving

area of the flash exposures arranged to be pivotable, which is loaded counterclockwise by the same spring 3. The tip 14 of this second organ 15 lies over a second toothing 15 on the distance ring 7, while at the other end of this part 13 a curved surface 16, which lies opposite a pin 17 seated in the guide number ring 11.

To explain the mutual relationships between the two organs 2 and 13 and the distance ring 7 should the diagram from FIG. 3 can be used. In this diagram, the three factors are those mentioned at the beginning Equation (1) set out in their mutual relationship, where GN is shown as the logarithm on the ordinate and D as the logarithm on the abscissa.

The factors GN, F and D of equation (1) can each be limited practically as mentioned at the beginning. The lightning reception areas are areas A and B, which are outlined in thick lines in the diagram, with D ₁ = GN _max / ^F _ma

The above explanations show that, as information for the photographer, the first display element 2 and the first teeth 8 of the distance setting ring 7 reach area A according to FIG . ^{i == :: r} "D <^. Dp, wherein the curved surface 10 of the guide number ring 11 extends in such a way that this first display element 2 comes into contact with the first teeth 8 of the distance setting ring 7. The relationship of the second display element 13 to the second

Tooth 15 of the distance setting ring 7 corresponds to the area B in Figure 3. » ie the setting of the distance ring 7 corresponds with a constant guide number G- the relationship D _0. «^ D« = ■ D, this second display element 15 then in turn with the second teeth 15 of the; Rangefinder 7 comes into engagement with khacking noises and defines the mutual position between the pin 17 in the guide ring 11 and its curved surface l6, so that the photographer is informed accordingly. ^:

To record the device after the innovation in daylight to hold out, twisted the rear end 18 of the cam surface 10 in the guide number ring 11, the first display element 2 by means of whose guide pin 9 counterclockwise in such a way: that the tip 5 of this organ 2 of the teeth 8 of the removal ring 7 comes free.

In addition, the pin 17 of the guide number ring comes here to rest on the rear end 19 of the curved surface 1β of the display element 13, so that its tip 14 from the teeth 15 of the distance ring 7 is lifted and thereby also releases it for daylight shots.

The device described above works as follows: First of all, with the guide number ring 11, one is derived from the Type of flash used and the sensitivity of the inserted film resulting guide number G set,. wherein the initial profiles of the tips 5 respectively. 14 des first resp. second display element 2 respectively. 13 can be determined by the fact that the cam surface 10 and the pin 17: rotated with the guide number ring. If then through Turn the distance setting ring 7 to close the aperture

and the distance D of the object from the apparatus -. the-relation-D j ^ · = ■ D - < Dg corresponds, instructs the first display element 2 removes the photographer from it, the second display element 13 for its part being in the engagement area according to equation (1) or outside this range of engagement. In other words, if the combination of GN-, F and D is in the range of A and B according to FIG. 3, occurs when the distance setting ring 7 is rotated a cracking noise that does not sound if this combination is out of range.

On the other hand, the guide pin 9 of the first display member 2 slides on the rear end 18 of the curved surface 10, so that the tip 5 of this organ 2 of the teeth 8 of the distance setting ring 7 and at the same time the tip 14 of the organ 13 through the pin 17 of the _; Guide number ring 11 is withdrawn from the teeth 15 of the distance ring, so that the distance setting ring can be rotated freely and no clicking noises arise when it is rotated. Λ

The embodiment according to FIG. 2 corresponds to the case in which the effect of the second display element 13 is viewed as secondary, with Dg according to FIG For this reason, this second display element 13 and the parts interacting with it have been omitted, and the length of the first teeth 8 of the setting ring 7 for the distance according to FIG D _w "- D ₀ increased value

max d.

used.

Since necessarily J clicking noises occur in the renewal according to the device only in response to rotation of the Entfernungseinstellringes when the device is set by means of the conductivities ring 11 in accordance with the conditions of the ■ equation (1) for flash photography, the device is also in that absolutely foolproof bootcovers as der_: photographer if a cracking sound can be heard when setting the ring 7 for a daylight exposure, you immediately know that the guide number ring is set to flash exposure.

Expectations;

Claims (1)

378976 * 7/20/6! 1. A device for the Peststellung Blitzaufnahmeberelches in cameras whose range-setting is coupled to the diaphragm, characterized in that an in flash photography with the adjustment ring (7) for the distance ^in:; Intervention coming ratchet mechanism (2, Ij5) is provided, which can only be felt and heard when the position of the setting ring meets all the conditions for perfect flash exposure. '_'._-- 2. Device according to claim 1, characterized in that between the guide number ring (11) and the setting ring (7) for the distance there is an intermediate element (2) controlled in its movement by the guide number ring: it is only correct for flash photos Adjustment of the removal adjustment ring (7) comes into engagement with this perceptibly and audibly. Patent attorney Dr. W. Andreevsky