DE1945454U - CAMERA WITH AUTOMATIC EXPOSURE. - Google Patents

Description

P.A. 3 78 977 * 20.7.

Essen, July 18, 1966, (26 775 / La / th)

PATENT ADVOCATE

Dr. Audreevsky

43 Essen, Kettwiger Str * 36

* cb 02

Utility model registration of the company Minolta Camera Kabushiki Kaisha Toyoda Building, l8, Shioeho-dori 4-chome, Minami-ku, Osaka, Japan

Camera with automatic exposure.

The innovation concerns a camera with automatic exposure and built-in power source for a flash bulb to be inserted into a corresponding lamp socket of the camera, where / with the automatic exposure has a locking lever for locking the indicator needle of the exposure meter, which corresponds to the movement of one seated on the release button Shift rod is movable.

In such a camera, hereinafter referred to as "EE camera" (Electric Eye-Camera) denotes ty ± -r, dv. it was common up to now *; the insufficient brightness of the for automatic adjustment object to be photographed indicate that the

Indicator needle of the built-in light meter from one specific area was brought out. However, there is the great disadvantage that if an object is necessarily should be photographed, whose brightness reaches a critical value, other measuring devices are to be used need to determine whether the brightness of the subject is actually for a flawless recording with the camera is too low or just at the limit of the Performance of the camera.

In view of these disadvantages of such cameras is the Innovation based on the task of a camera of the aforementioned Art to create * which a warning lamp on a suitable, immediately visible point, which lights up in the event of failure of the automatic exposure due to insufficient brightness of the object and warns the user of a daylight exposure. ;

After a proposed solution to the innovation is provided, that parallel to the circuit of the flashlight lamp a circuit for a warning lamp with a normally open Microswitch and on the locking lever one of the position of the indicator needle of the exposure meter for an actuation the automatic exposure of insufficient brightness of the object to be photographed corresponding deep notch is designed so that when the release button is depressed and the indicator needle locked into this notch the ^ Microswitch to indicate a failure of the automatic exposure due to insufficient brightness is switched on.

If, therefore, with the new EE camera, the photographer: Press the shutter release button to take a picture of an object ^

which is not bright enough to use the built-in To make an automatic aperture setting with the exposure meter, the warning lamp lights up before the actual Release process so that the photographer sees that the automatic setting of the exact aperture value is impossible and can put on a suitable flash bulb and take a flash picture. The headlamp can be made to light up using the power source for the flashlight bulb, so that no special power source is required. The EB camera according to the innovation therefore gives a much more reliable and faster warning regarding an inadequate Brightness of the object as a previously common exposure control with a needle and corresponding markings, so that sufficient lighting of the object can be provided quickly and reliably.

Appropriately, according to a further proposal, the innovation is provided that the circuit for the warning lamp with its microswitch parallel to the circuit for the Flashlight with a pair of contacts on the breech housing, is connected to the same power source.

The warning lamp can be placed under one in the upper one as desired Camera cover inserted translucent cap or be built directly in the camera viewfinder. In the latter pail ". ■■ _ ■ According to a special suggestion of the innovation, the warning lamp sits in a lamp socket in the viewfinder housing used one-piece prism and this prism shows the light rays of the WameLämpe on a display surface reflective surface, so that when the warning lamp is switched on the display area is visible in the viewfinder.

The prism which forms a part with the lamp socket preferably consists of a transparent, high-molecular-weight prism Material like an acrylic resin and therefore very compact and inexpensive to manufacture, it being used together with the warning lamp within the viewfinder as a test facility for others Values such as the condition of a dry cell battery and the condition of the film inserted in the camera are used can be. '-

Some preferred embodiments are shown below the innovation explained in detail with reference to the accompanying drawings; show it:

Figure 1 is a schematic representation of the main part of the Warning device according to the innovation; -

Figure 2 is an enlarged perspective view of the V Explanation of the construction of the exposure meter of the device from FIG. 1;

Figure 3 shows the electrical circuit diagram of the warning device according to Figure 1;

FIG. 4 shows the perspective view of an EE camera the warning device according to the innovation;

FIG. 5 shows a modified version of the exposure meter from Figure 2 in a schematic representation;

FIG. Β shows a warning device mounted in a viewfinder in schematic representation, partly in section;

Figure 7 is a perspective view of a prism for a "-,: Warning device;

Figure 8 a view into the viewfinder with built-in prismaj

FIG. 9 shows another embodiment of the warning device according to: FIG. 6;

FIG. 10 shows a section through a lens of the device

from Figure 9i and:

Figure 11 shows a view of the viewfinder with a lens Figure 10.

The honeycomb window 2 of an exposure meter on the upper front side of the camera housing 1, which can be seen in particular in FIGS. 1 and 4, guides the light beams onto the photoelectric cell of the exposure meter and thereby sets the indicator needle 3 in motion. The release rod r of the release button 4 carries two pins 5 and β and is; -: pressed upwards by a tension spring. By the force of this spring, the pin 5 is pressed against a locking lever 10: ■ ■ '- for the indicator needle 3, which is spring-loaded in a clockwise direction. This lever has on the underside an arcuate milled recess 7 * which holds it in a certain ν display area of the needle 3, furthermore, a notch 8 formed at the far right end of this milled recess 7 and a shoulder 9 for actuating a microswitch 22. The notch 8 runs in a direction opposite to the center of the curvature of the milled recess 7. The pin 6 is pressed against a diaphragm control lever 12 by the pressure of the tension spring acting on the lower end of the release pin 4, which is pulled down by a spring in guide slots and ah the part of it The lower edge, which lies above the indicator needle 3, has several steps 11 with which the indicator

needle is engageable. When the release button 4 is not depressed, the levers 10 and 11 are fixed in the positions shown in FIG.

The lever 12 carries at the far right end (Figure 1) an actuating pin 13, which through slots 15 in the upper part of two symmetrically arranged ■ Shutter plates 14 protrudes, these slots 15 of the Sheets 14 are formed near the pivot axis of the sheets. As FIG. 1 shows, these two slots are 15 formed in the two sealing plates 14 in such a way that they cross one another.

The locking housing 16 has two terminals 23, of which one via a flash bulb 18 to one pole of a dry battery 17 and the other directly to the other pole of this battery 17 is connected. In addition, the battery 17 is in a circuit for a warning ' lamp 21, which is either in the viewfinder 19 or under a translucent display cap 21 in the top wall of the Camera is arranged. This circuit runs from the one Pole of the battery 17 to the microswitch 22, which is located under the actuating shoulder 9 of the lever 10, and from this via the warning lamp 21 to the other pole of the battery.

In another embodiment the innovation is the one acting on the lever 10 at the far left end Tension spring has been omitted, with a microswitch in; the training according to Figure 5 is used ;. This microswitch 22 has a lower fixed contact: and an upper movable contact. The movable lever of the upper contact is actuated by the actuating lug 9 in

its upper position, when the lever ΙΌ blocking the needle 5 is held in its upper position, so that the microswitch 22 remains open while; when lowering the ^{extension 9 a} m lever 10, the joint contact of the microscope holder also drops and the holder 22 'closes. -...-- ". ^: ", ^

When the release button 4 is pressed to take a picture to make, thereby the pin 5 is pressed down at the same time, which up to then the lever 10 against the force of his mainspring had held, so that now this spring rotates the lever 10 clockwise and presses against the indicator needle J5 of the light meter, which is thereby held in a position, which the measured brightness in the curved recess 7 of the lever, provided that the brightness of the subject permits exposure. On the other hand, when depressing of the release button 4, the pin β is also depressed the shutter lever 12 follows the movement of this 6 until the step part 11 rests on the indicator needle 3. During this downward movement of the lever 12, the pin 1J5 is also moved downward and pushes the two locking plates apart to achieve a certain aperture. By further depressing the release button 4 the camera shutter is operated and the film is exposed. When the release button 4 is released, all parts return to their starting position according to Figure 1 back.

In the case of insufficient light conditions, ie when the brightness of the object is too weak to trigger the automatic exposure, the indicator needle 5 swivels off the scale 'J- and moves all the way to the right, so that if

Now the release button 4 is depressed, the needle. _L tip engages in the notch 8 of the lever 10 and the extension 9 closes the microscope holder 22. As a result, the warning lamp 21 is switched on and the photographer is shown that the lighting conditions are no longer sufficient to operate the automatic aperture setting, so that photographs can only be taken with a flash. In these circumstances it becomes the trigger. If button 4 is further depressed without a flash bulb 18 being inserted, the shutter is actuated, but only an underexposed image is obtained. When the warning lamp 21 lights up, the photographer must release the release button 4 and insert a flashlight bulb 18. in order to be able to carry out a perfect flashlight exposure.

The warning lamp is needed to determine whether the lighting conditions are sufficient for the automatic exposure control or not 21 not necessarily arranged within the viewfinder 19 too but it may be appropriate to any other Be attached in place of the camera, such as on their upper wall (Figure 4), preferably a translucent light cap 20 is provided. A review, Whether the lighting conditions are sufficient for taking photos with daylight or not is easy to tell. tes depressing the release button 4 on the object. directed camera, as the warning lamp lights up immediately in insufficient light conditions. -

A special embodiment of the innovation is shown in FIGS. 6-10, in which the warning device is arranged in the viewfinder of the camera. The surface of a ^;

Prism 24, which is indicated by a warning lamp 25 (Figure β) is illuminated, lies directly in the lower edge of the bright frame 26 in the viewfinder. This frame 26 is -: limits the scope of the image of an ALBADA viewfinder. When one looks into the viewfinder, one finds this frame 26 and the illuminated surface of the prism 24 practical in a common plane. Therefore, when this illuminated "- ■; Area of the prism 24 is labeled accordingly, can If you look into the viewfinder and at the same time illuminate the surface of the prism, this inscription is easy to see read. The position of this marking in the field of vision allows as desired by appropriate selection of the angle of the reflective surface of the prism and the Select the height of this illuminated area, for example (see Fig. 8) the lettering directly in the light frame 'can appear without obstructing the view through the viewfinder.

To attach the prism 24, in the embodiment according to FIG. 6, an opening 27 of suitable dimensions is formed on the right-hand side end of the viewer housing 28 near the eyepiece 32. forms. The eyepiece 52 carries the light frame 26 on the inner surface. In addition, in the viewfinder housing 28 at the front end there is an objective lens 29 and, at a suitable distance between this and the eyepiece 32, a concave lens j51 v with a concave half-mirror surface 30 on the one facing the eyepiece Used area. The transparent work -Stoff, for example, an acrylic resin, existing prism _24,: having a lamp socket 33, a reflective _top: surface 34, a display area 35 may be that labeled or otherwise marked and an abutment surface 36 (Figure 7) · In the receiving opening 33 of the prism 24 is

then a warning lamp 25 connected to a corresponding battery 37 is inserted so that its light beam falls on the reflective surface ~ 3 & and from there through the inscribed surface 35 to the mirror surface 30, from where the light beam reaches the eyepiece. As has already been explained in connection with the embodiment according to FIGS. 1-5, this warning lamp 25 lights up when a microscope holder 38 is closed.

The warning device shown in Figure β works as follows:

If the lighting conditions are not sufficient to actuate the auto iris, the micro ^is: switch "58 is closed by suitable control elements, which are not shown here again, This is the -. Warning lamp 25 in the lamp holder 33 of the prism 2 $ for ^winding: _v lights brought and its light beam is refracted at the reflecting surface J> K of the prism to the labeled or otherwise marked surface to illuminate 35th In the-. Writing of this surface 35 can be seen through the eyepiece 32 and the semi-transparent concave mirror 30 as part of the lower edge of the light frame 26 .

A further modification of the new dimensioning is shown in FIG. 9, the prism device 2k carrying the warning lamp 25 being inserted in the viewfinder housing 28 between the objective lens 29 and the concave lens 3I. The light from the warning lamp 25 can thereby be perceived when looking into the viewfinder through the eyepiece 32 and the concave lens 31, the marking on the display surface 35 being able to stand out from the other part of the viewfinder image. When the display surface 35 is displayed in the same way as ...

The object that is located should be visible, a special visibility can be achieved through the lens system 32, 39 and 31, which is practically the same as the lens system 32>
31 and 29: -

In FIG. 11, as in FIG. 8, a view through a viewfinder is shown, but the indication of insufficient light conditions appears as a point of light instead of an inscription. ■ - ■ ': ■ -

Expectations;

Claims (5)

Protection requirements. 1. Camera with automatic exposure and built-in power source for a flash bulb to be inserted into a corresponding lamp socket of the "-;..; --_ camera," whereby the automatic exposure has a locking lever for locking the indicator needle of the exposure meter, which corresponds to the movement of a button on the release button seated switching rod is movable, characterized in that parallel to the circuit; the flashlight lamp (18) a circuit for a warning lamp (21 or 25) with a normally open microswitch (22 or 38) and on the locking lever (10) one of the position of the indicator needle ( 3) the exposure meter is designed with a deep sinkerbijing (8) corresponding to the brightness of the object to be photographed for an operation of the automatic exposure control, so that when the trigger button (H-) is depressed and the indicator needle locked into this notch, the micro switch is closed by the locking lever and thus: the warning lamp for Indication of a failure the automatic exposure is switched on due to insufficient brightness: is. 2. Camera according to claim 1, characterized in that the circuit for the warning lamp (21 or 25) with its microswitch (22 or 38) parallel to the circuit for the flashlight lamp (18) with a pair of contacts (23 or 38) on the lock housing (16) is connected to the same power source (17 or 37). 3. Camera according to claim 1 or 2, characterized in that the warning lamp (21) under one in the upper camera cover inserted translucent cap (20) is installed. 4. Camera according to claim 1 or 2, characterized in that that the warning lamp (25) is built into the viewfinder (28) of the camera. 5. A camera according to claim 4, characterized in that the warning lamp (25) in a lamp holder (33) of an im Viewfinder housing (28) inserted one-piece prism (27) sits and this prism a the light rays of the warning lamp on a display surface (35) reflecting Eläne (3 ^), so that when the warning lamp is on, the Display area is visible in the viewfinder. : Patent attorney Dr. W. Andreevsky