DE2351325B1 - Photographic shutter with light stabilizers - Google Patents

Description

The invention relates to a photographic shutter with light stabilizers which prevent that the exposure aperture is released during the establishment of the exposure readiness.

In the case of photographic cameras with a shutter blade having an opening, precautions must be taken to meet the exposure opening at the point necessary for cocking the shutter, the exposure opening briefly releasing return movement of the shutter blade to be covered by light protection means.

In such a case, which became known through DT-OS 2 242 578 Closure is a separate cover wing is provided, which when returning (Tensioning) the shutter blade is pivoted by the tensioning means in front of the exposure opening, so that the opening of the shutter blade which sweeps over the exposure opening does not cause any undesired exposure can cause. Since the cover wing is required as an additional part that only performs a single function is, there are relatively high costs and additional space requirements compared to the benefits.

It is the object of the invention to provide the light stabilizers to be trained in such a way that they can also perform other functions and those usually necessary for them Replace parts to save costs and space.

The solution to the problem is contained in the claims and is explained on the basis of the drawings. All parts not necessary for understanding the device have been omitted from the drawings. It shows
F i g. 1 the shutter with a view of the diaphragm blades,

F i g. 2 the lock with a view of the lock slide and the light protection means in the starting position,
F i g. 3 the closure according to FIG. 1 and 2 in plan view,

F i g. 4 the closure according to FIG. 1 to 3 at the beginning of the bolt tensioning process,

F i g. 5 the closure according to FIG. 1 to 4 in the clamping position.

The shutter 9 and the diaphragm blades 2, 3 are slidably mounted on a bearing plate 10. The locking slide 9 is acted upon by the tension spring 11 in the direction of arrow B and interacts with the trigger 12 through its angled 9Zj. His

Opening 9a sweeps over the exposure opening 1 during the process.

The diaphragm blades 2, 3 (see FIG. 1) have openings 2a, 3a or 26, 36 provided, which by changeable overlap of the openings 2a, 3a or 26, 36 different Can form aperture openings, the size of the lens aperture 2a, 3a by the Adjuster 18 as a function of the amount of light falling through the photocell aperture 26, 36 onto the photocell 8 is chosen. The movement of the adjuster 18 is provided by means of pin-and-slot connections 7,6a, 4,66,5,6c A lever 6 pivotable about the bearing 16 is transmitted to the diaphragm blades 2, 3.

The switching handle 14 is mounted displaceably in the direction of the arrow A and is used to establish the readiness for exposure (shutter lift, film transport, tensioning of the percussion ignition device, turning of the multiple flash lamp socket). In order to be able to use one and the same switch handle 14 to keep the switching travel for the shutter lift and the like as well as the switching travel for film transport, which becomes smaller with increasing winding diameter, precautions must be taken to prevent the switching handle 14 from being disengaged from the slide 9 when it reaches the locking position to separate.

According to the invention, this is done by the light protection 13, which is connected to the switching handle via its arm 13a 14 is in engagement and cooperates with the locking slide 9 through its angled portion 136. the The direction of movement of the light protection 13 is approximately parallel to the shutter 9, and its slope 13c works together with a stationary projection 15.

The mode of operation of the device is as follows: Based on the method shown in FIGS. 1 to 3, the switching handle 14 is actuated in the direction of arrow A. As shown in FIG. 4 shows that the light protection 13 is initially moved in front of the exposure opening 1.
After the light protection 13 has become effective, its angled portion 136 hits the locking slide 9 resting on the pin 17 and takes it with it in the direction of the arrow A. During this chip movement, the opening 9a of the locking slide 9 sweeps over the

Exposure opening 1, but without being able to produce an exposure, since the light protection 13 is the exposure opening 1 covers. At the end of the clamping movement, the locking slide 9 engages with its angled position 9Zj on the trigger 12 (see Fig. 5), and the tension spring 11 is tensioned.

At the same time, the light protection 13 strikes the stationary projection 15 with its slope 13c. Included the light protection 13 is pivoted in the direction of arrow C, and its arm 13a is moved by the switching handle 14 separates.

Thereafter, the movement of the switching handle 14 is transmitted exclusively to that not shown Film transport device, which depends on the winding diameter after a more or less long Switching path of the switching handle 14 by taking effect, for example, the film scanning Locking device is locked.

After the readiness for exposure has been established, the switching handle 14 runs back in the direction of arrow B into the starting position. In doing so, its boom 14a strikes against the arm 13a of the light shield 13, causing it to move away from the projection 15 and into the starting position according to FIG. 2 is moved. The shutter is now ready for exposure.

By actuating the trigger 12, the shutter 9 is released to run in the direction of arrow B , during which the exposure of the recording material takes place. After the closure slide has expired, the device again takes the steps shown in FIG. 2 starting position shown.

In a departure from the described decoupling of the light protection 13, this process can also be applied to others Kind, for example transversely to the direction of movement of the light protection 13 and the locking slide 9.

Due to the advantageous use of the light protection 13 as a control and coupling element between the switching handle 14 and locking slide 9, the device was designed to be particularly cost-effective and space-saving.

For this purpose 2 sheets of drawings

Claims (4)

Patent claims: 1. Photographic shutter with light stabilizers which prevent the exposure aperture is released during the establishment of readiness for exposure, characterized in that that the light stabilizer is used to produce the readiness for exposure Switching handle cooperates and as an engaging and disengaging coupling element between the switching handle and the shutter is formed. 2. Photographic shutter with light stabilizers according to claim 1, characterized in that that the light protection means (13) is designed as a slidably and pivotably mounted slide, which is in engagement with the switching handle (14) via an arm (13a) and an angle (136) which is arranged at a distance from the slide-shaped closure (9), so that the light protection means (13) only after one necessary for the light protection to take effect First switch the lock (9) to the clamping position brings. 3. Photographic shutter with light stabilizers according to claim 1 or 2, characterized in that that the light protection means (13) has a slope (13c) which is provided with a stationary projection (15) cooperates, the light protection means (13) when it hits the at the end of the constant switching travel lying projection (15) pivoted and from the switching handle (14) is decoupled so that the switching handle (14) to terminate the beyond, not constant switching travel is free. 4. A photographic shutter with light stabilizers according to any one of claims 1 to 3, characterized characterized in that the switching handle (14) has a boom (14a) which with the arm (13a) of the light stabilizer (13) interacts and resets it when it returns to the starting position.