SU1506427A1 - Arrangement for monitoring alignment of viewfinter field of vision with stll camera frame field - Google Patents

Abstract

The invention relates to photographic equipment and improves the accuracy and performance of the control devices of cameras. The device contains test objects 4.5, mounted in the subject planes of the collimators 8, 9, whose axes intersect in the center of the entrance window of the viewfinder 10 and form equal angles α with the viewfinder axis 10. The recorder is made in the form of a photodetector device 14 placed in the image plane of the autocollimator 15 mounted on the optical axis in front of the lens 17 of the camera 3 and interfaced with the frame window area indicator. The pointer is made in the form of a mirror 11, aperture 12 and stops 13 installed symmetrically with respect to the center of the opening of the diaphragm 12. The camera 3 is placed on the holder 2 and the images of test objects 4, 5 are observed in the video searcher 10. By mixing the image of the diaphragm relative to the center of the diaphragm 12 The frame window's zone indicator determines the magnitude of the mismatch between the viewfinder field of view and the frame field of the camera. 4 il.

Description

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The invention relates to photographic equipment, specifically to instrumentation.

The aim of the invention is to increase accuracy and productivity.

Figure 1 presents the scheme of the device; Fig. 2 is a view of the field of view of the viewfinder of the controlled camera at the moment of its adjustment in the holder; on fig.Z - diagram of the photodetector; figure 4 - the same option.

The control device contains the base 1, the holder 2 of the monitored camera 3, the test objects 4 and 5 placed in the focal planes of the lenses 6 and 7 of the collimators

8 and 9, whose axes intersect on the optical axis in the center of the entrance window a, where the entrance pupil of the lens of the viewfinder 10 of the camera 3 is located, and form equal angles with the axis of the viewfinder 10, a pointer of the frame window frame, made in the form of a flat mirror 11 and located on its mirror surface of the diaphragm 12 and the stops 13 installed symmetrically with respect to the center of the aperture of the diaphragm 12, and the recorder, made in the form of a photodetector device.a 14, the sensitive area P of which is located in the image plane autocollimator 15, in the focal plane of lens 16 of which diaphragm D is set. Autocollimator 15 is installed in front of lens 17 of camera under test 3. Check marks (KM) of test objects 4 and 5 are light-scrambled

The device works as follows.

A controlled camera 3 (figure 1 is fixed in holder 2 and, observed in the viewfinder 10, using adjusting movements of holder 2, the reference marks of test objects 4 and 5 are positioned relative to the frame of the viewfinder 10 (figure 2). If the photodetector 14 includes an image analyzer (FIG. 3), then it is advisable to use a spot diaphragm D (FIG. 1), and the diaphragm 12 must be performed taking into account the allowable difference of viewfinder field of view 10 Lemma kad5

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camera 3. In this case, the image of the diaphragm D in the film channel of the camera 3 coincides with the aperture of the diaphragm 12 only if the magnitude of the mismatch of the field of view of the viewfinder 10 with the field of the frame does not exceed the allowable value. At the same time, the light rays from the diaphragm D emerging from the autocollimator 15 and passing through the lens 17 of the controlled camera 3, after reflection from the mirror 11, return to the autocollimator 15 and form an image of the diaphragm D. in the center of the sensitive area of the photodetector 18 of the photodetector 14 (Fig. 3) falls on the photodiode comparator 19, onto which the reference displacement Ug is also introduced. The illuminance of the light indicator 20 indicates the suitability of the monitored camera 3. If the mismatch of the field of view of the viewfinder 10 with the frame field of the camera 3 exceeds the permissible value, the light beam of the autocollimator 15 does not fall on the mirror 11 (Fig. 1), and consequently, on the photodetector 18 image analyzer. In this case, the indicator 20 (FIG. 3) does not light up. When using this type of image analyzer, there is no need to open the shutter of the camera 3 for a long time, since the electronic circuit ignites the indicator 20 in case of suitable monitored cameras at any shutter speed.

If the photodetector 14 includes an image analyzer, presented in figure 4, then the diaphragm 12 must be a point, and the diaphragm D must have a significant diameter. In this case, the image of the diaphragm D is formed in the plane of the film channel of the controlled camera 3. The rays of light reflected from the mirror

11 are returned to the autocollimator 15 and in the plane of the photocathode P of the vidicon.

21form the image of the diaphragm

12, which is transmitted to the screen 22 of the television set on the system 23. The image is offset from the center of the screen

22 by an amount proportional to the magnitude of the mismatch of the field of view of the viewfinder 10 with the frame field of the camera 3. To estimate the magnitude of the displacement

the image can be used measuring grid introduced into the field of view of the television system, for example, by installing a glass plate with strokes in the plane of the intermediate image. To eliminate the need to open the shutter of the monitored camera 3 for a long time, a television system with image storage is used.

Claims (1)

Invention Formula A device for monitoring the viewfinder's field of view with the camera's frame field, containing a base with a camera holder located on it, a test object with a reference mark placed in front of the viewfinder entrance window, and a frame window area indicator set in its plane, and recorder located on the optical Romm dudouc / fome / tf L R 18 and on 0 camera lens axes, about t l., in order to improve accuracy and performance, it is equipped with an additional test object identical to the main one, while the test objects are placed in the focal planes of the objectives of the collimators introduced which are located at the same angles to the optical axis of the viewfinder and intersect in the center of its input window, and the pointer of the frame window area is made in the form of a flat mirror and located on its mirror surface of the diaphragm and stops, installed symmetrically relative to the center of the aperture of the diaphragm, while the recorder is fulfilled in the form of a photodetector, sensitive the platform of which is located in the image plane of the inserted autocollimator with a diaphragm in its subject plane, set in front of camera lens. J lz / fO / 77 / yO f AM ffe / 77O C) and Mr. / 13 fut.3 ig / / I / t