DE2704931C3 - Single-lens reflex camera with internal exposure metering - Google Patents

Description

The invention relates to a single-lens reflex camera which, for exposure measurement in the exposure beam path with the aperture open, has an adjuster that can be coupled to a coupling element of the lens-fitted aperture stopper, and which, against its return spring, can be adjusted according to the aperture values set on the aperture stopper and because the adjuster is movable when the interchangeable lens is removed its return spring is moved into a basic position beyond the position corresponding to the start aperture.

There are built in single-lens reflex cameras exposure metering known by Internal measurement with an open aperture deliver the desired measurement result. Special lenses are required for this, that of the camera-side exposure metering device adapted and with the lens-side diaphragm cooling plate have connected coupling members. Interchangeable lenses that do not have such coupling elements which can also be attached to the camera and for performing photographic work Suitable for taking pictures: however, exposure measurement is not possible because the return movement of the Adjuster is not controlled. With this in mind, stops are provided in other known cameras, which limit the return movement of the exposure metering device in one position, the largest aperture (opening aperture) wi! !! ilfe cinws such ·; Aii> cii! Agj can Exposure measurements can be carried out at the working aperture.

When removing the interchangeable lenses, the adjuster then moves into the position that the initial aperture is equivalent to

To carry out work panel measurements are also known interchangeable lenses, each gear independent of the aperture and rigid Have actuator through which at the attached

Interchangeable lens adjuster of the exposure metering device against its return spring in the start position corresponding to the largest aperture The stops on the camera side for the adjuster for the purpose of the aperture measurement are durable

ίο not required. When these interchangeable lenses are removed, the adjuster moves, as a result of its return spring, into a basic position that deviates from the position that corresponds to the start aperture
The object of the invention is an arrangement that at

π removed interchangeable lens the measuring device According to the invention, this is achieved by an actuating cam on the adjuster it is provided which, when the adjuster is in the basic position, is arranged in the measuring circuit

Keeps main switch in open position. This is useful Actuating cam coupled with a slide switch The invention is based on an illustrated and

described embodiment explained It shows

F i g. 1 an arrangement according to the invention when

set interchangeable lens and

F i g. 2 shows the arrangement according to FIG. 1 with the interchangeable lens removed.

In a partially shown camera housing 1 (cf. FIG. I), this is based on a time scale 2

jo adjustable measuring mechanism 3 rotatably mounted The measuring mechanism 3 is in a known manner on one in the recording beam path lying photoelectric converter 7 connected. Corresponding to the measuring tool pointer 4 the tracking mark 5 of the adjuster 6 is arranged

Vi The adjuster 6 is rotatably mounted concentrically to the measuring mechanism 3. The return spring 8 seeks to turn the adjuster 6 clockwise. Opposite the pointer 9 provided on the Eins'.eller 6 are several Blenoenskalen 10a, lOfe. 10c provided.

These aperture scales 10a, 106 and 10c are used to display the aperture values in the case of interchangeable lenses Preselection diaphragm, whose diaphragm stopper U via a coupling member 12 with the adjuster 6 of the The observation measuring device can be coupled for automatic

· »■> taking into account different initial openings takes into account each initial opening set the pointer 9 always has the same position.

The adjuster 6 has a switching cam 14 with the the shift rod 15 is in connection The shift spring 17 seeks to cause the switching rod 15 to close the main switch 16.

When the interchangeable lens Π is removed (see FIG. 2), the return spring 8 has the switching cam 14 Shift rod 15 moved against the shift spring 17, so

ce J. fl J »·. * fnV '' ri ^r r " ^rf rt ^: - ■ P- '* · - · ■» »·

of the interchangeable lens 13 becomes the adjuster 6 against its return spring 8 by the actuator 12 emotional. The switch cam 14 is made up down, SQ that the switch rod 15 as a result of mi switch spring 17 can close the main switch 16.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Single-lens reflex camera used to measure exposure In the recording beam path with an open aperture, one can be coupled to a coupling member of the aperture stopper on the lens side Has adjuster which, against its return spring, is adjustable in the diaphragm stopper Aperture values corresponding positions of the coupling member is movable, and at the Removal of the interchangeable lens of the adjuster due to its return spring over that of the start aperture corresponding position is moved into a basic position, characterized in that that an actuating cam (14) is provided on the adjuster (6) which is in the basic position located adjuster (6) a main switch (16) arranged in the measuring circuit "in Open position hill 2. Single-lens reflex camera according to Claim 1, characterized in that the actuating cam (14) is coupled to a slide switch (15).