JPS58178330A - Photographic or cinematographic camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a taking lens, a reflective finder whose optical path is guided through the taking lens through a light turning member, and an active infrared rangefinder, the rangefinder being an infrared A light receiver having a sensing element is provided, and an infrared image formed on the target object from the rangefinder's light emitter is formed on the light receiver via a photographing lens and a mirror surface that reflects infrared light arranged in the finder optical path. It relates to a type of photographic or cine camera.

In a known photographic camera of this type (DE 293 610 Φ), an infrared-reflecting mirror surface is arranged between a light deflecting element, which is designed as a swiveling mirror, and a viewfinder image plane. The finder image is projected onto a screen in the finder image plane and is converted into an erect finder image visible within the finder eyepiece via a pentaprism. The infrared reflecting mirror surface, which is transparent for the rest of the light spectrum, extracts an infrared image from the viewfinder beam and images it onto an element configured as an infrared sensing element configured as a photodiode.

In compact miniature reflex cameras, the space that exists between the screen and the swiveling mirror in the viewfinder image plane is often not sufficient to incorporate an additional infrared-reflecting mirror surface.

As a method of arranging the infrared reflecting mirror surface so that it does not take up much space, there is a method of arranging a separate infrared mirror near the reflecting mirror of the camera and a photodiode outside the field of view of the finder screen. In this case, the reflector should be constructed and transparent to infrared light, while the infrared reflector should be such that the infrared image reaching it is imaged onto the photodiode of the screen. It should be tilted at a certain angle so that

It is also possible to use a single prismatic mirror in place of the two mirrors, the front side reflecting visible light but transparent to infrared radiation and the back side reflecting infrared radiation. The refractive power that acts on infrared light within the glass of the prismatic mirror refracts the infrared light.Therefore, the angle of inclination of the mirror surface that reflects infrared light relative to the mirror surface that reflects visible light is the difference between two separate mirrors, as described above. If you use it, it will also get bigger.

The above two space-saving methods of arranging mirror surfaces that reflect infrared rays have the disadvantage that it is necessary to close up the bell that reflects infrared rays as well as the mirror for taking pictures. However, the inertia of mirror-up possible arrangement formation is
It is significantly larger than a normal simple reflector. Therefore,
In most cases, it is not possible to amplify the reflector mechanism as fast as desired.

In contrast, in the type of camera described at the beginning,
An infrared screen is arranged at or near the finder image plane, a mirror surface that reflects infrared rays in the infrared screen forms an inclined angle with respect to the screen surface, and an infrared sensing element is arranged at or near the end face of the infrared screen. The photographic or cine camera of the present invention is characterized in that it includes an additional configuration of a difference between the light-converting inner member and the viewfinder image plane in order to incorporate a short surface that reflects infrared rays in the viewfinder optical path. It has the advantage of not requiring space. Therefore, the camera of the present invention can be constructed with a very small overall height, which is compatible with the increasing reduction in camera volume of camera manufacturers.

The camera according to the invention has the advantage that, in its configuration as a reflex camera, the kinematics and inertial behavior of the swiveling mirror, ie the inherent disadvantages of reflex cameras, do not have a disadvantageous effect.

The camera described in claim 1 can be configured more advantageously and preferably by the means described in claim 2 and subsequent claims.

In this case, the embodiment according to claim 4 is particularly advantageous. According to this configuration, an infrared screen that is particularly preferable in terms of manufacturing technology can be obtained.

One advantageous embodiment of the invention also results from the embodiment according to claim 5.

By mirror-finishing the arc-shaped end surface of the infrared screen,
The necessary optical path is formed between the mirror surface that reflects infrared rays and the infrared sensing element. The infrared radiation is retained in the infrared screen after being reflected from the mirror surface, since it is completely reflected on both sides. The intensity of the light beam traveling inside the infrared screen is not changed by several reflections, since the light beam is propagated unattenuated to the mirrored end face of the infrared screen.

Of course, a mirror surface that reflects infrared light will reduce the dose reflected from the mirrored end face of the screen, since these rays will not be able to pass through the mirror surface and thus will not reach the photodiode. If the object distance is large, the infrared imaging will of course be located close to the mirror end face, but still only at least a small percentage of the rays reflected at the mirror end face will reach the photodiode. Additionally, the light rays are randomly scattered throughout the thickness of the infrared screen. When the ratio of the height of the mirror surface that reflects infrared rays to the thickness of the infrared screen is 1:5, the loss in light quantity is only a factor of 10. If the object distance is short and within rangefinder equilibrium, the dose loss is doubled. However, the remaining amount is quite sufficient to control the infrared sensing element.

Advantageous embodiments of the invention also result from the claims. In this case, the drive device that moves the rangefinder and the distance ring of the taking lens synchronously adjusts the rangefinder and the taking lens to the shortest focusing distance of the taking lens at the start of each distance measurement. If a distance meter is constructed, the small-area infrared reflecting mirror surface described in claim 7 can be used. From this adjustment, the drive device directs the distance ring and, in known rangefinders, the infrared rays emitted from the light emitter in the direction of longer distance.
Move the infrared image until it reaches the periphery of the infrared reflecting mirror surface. At this time, the infrared sensing element senses the reflected light and shuts off the driving device. In practice, only the periphery of the infrared reflecting mirror surface is unused, so that the mirror surface can be constructed with a significantly smaller surface area with the dimensions mentioned. In this case, the extended surface of the infrared reflecting mirror surface may be arranged parallel or perpendicular to the direction of the infrared image scanning path.

In the first case, the peripheral part of the mirror surface in the direction of inclination of the cut surface scans the position of the infrared image, and in the second case, the peripheral part in the direction perpendicular to it scans.

An advantageous embodiment of the invention is defined in claim 8.
It can also be obtained from the section description. This implementation is advantageous if the rangefinder and camera are to track distance changes of the subject. In this case, the mirror surface should have sufficient length so that even when the rangefinder is adjusted to its maximum distance and the object is at its shortest focusing distance, the infrared radiation still hits the infrared sensing element.

An advantageous embodiment of the invention is defined in claim 9.
It can also be obtained from the section description. In this embodiment, the infrared image is somewhat substantially sharply focused onto the viewfinder image plane.

When the rangefinder reaches its equilibrium state, the taking lens is also adjusted to sharply aim the subject.

Advantageous embodiments of the invention also result from the claims. This embodiment is advantageous if, for constructional reasons, it is necessary to arrange the infrared star at a short distance from the viewfinder image plane. By providing a reflector that reflects twice, it is possible to place the infrared screen at a distance from the finder image plane that corresponds to several times the mirror thickness. In this case as well, when the rangefinder reaches an equilibrium state, the objective lens is sharply adjusted to the target object.

Advantageous embodiments of the invention also result from the claims. The control circuit according to the invention for additional distance correction of the photographing lens after the equilibrium state of the rangefinder has been achieved makes it possible to select any distance from the viewfinder image plane when placing the infrared screen, in which case the photographing For practical reasons, this distance should of course be kept as small as possible in order to reduce the amount of post-adjustment of the lens. When rangefinder equilibrium is achieved, an infrared image is actually sharply formed on the infrared screen, but a visible image is not sharply formed at the viewfinder and photo camera image planes.

By virtue of the fact that an equilibrium state is achieved and thus that a substantially constant distance correction is carried out in the taking lens after the rangefinder has stopped,
The target object is sharply adjusted on the image plane of the camera and also within the viewfinder. In this case, for every type of taking lens, a specific pre-adjustment is of course necessary in order to adjust the balance of the rangefinder.

The camera according to the invention as claimed in claim 13 also has the advantages mentioned at the outset of a small volume and a relatively small moment of inertia of the swiveling mirror.

Advantageous embodiments of the camera according to the invention also result from the claims. This arrangement of the infrared screen and the finder screen eliminates the need for post-adjustment of the photographing lens after distance measurement, which is required in the embodiment recited in claim 12. Based on the fact that the refractive index of glass decreases as the wavelength increases,
The infrared image plane is further away than the finder image plane. By appropriately selecting the geometric distance between the infrared screen and the viewfinder image plane, the deviation of this plane can be compensated for, so that the infrared image and finder image can be sharply formed at the same time with the same taking lens adjustment. . In this case, the geometric distance from the surface of the infrared screen facing the finder surface to the matte surface of the finder screen, which is the viewfinder image surface Kh, is actually 1. It's like a fog.

The invention will now be described in detail with reference to the illustrated embodiments.

In the reflex camera shown in a schematic sectional view in FIG. 1 as a first embodiment of the camera of the present invention, only the photographic lens 10, reflex finder 11, and light receiver 13 shown by dotted lines are partially Active infrared rangefinder shown 12
has.

The structure and mode of operation of the infrared rangefinder are described in detail in German Patent Application No. 2,936,104. Accordingly, a general description is provided herein.

An infrared rangefinder has a light emitter and a light receiver.

The emitter emits focused infrared radiation. This light beam is emitted within the emitter by a laser diode P and a projection lens. This light beam hits the target object on which the photographic lens is to be focused, and forms an infrared image thereon, and the facial image is formed on the infrared sensing element 14, for example, the photodiode 1, via the photographic lens 10. The photographing lens 1o generally has a distance adjustment device, for example a distance adjustment ring having a distance scale, for focusing. Via a drive mechanism, the light source of the emitter is coupled to the distance adjusting device in such a way that the light beam pivots relative to the optical axis of the photographing lens when the photographing lens is adjusted in the direction of its optical axis. The drive mechanism stops the photographic lens, and thus the inclination of the light beam, until the infrared image projected onto the subject hits the infrared sensing element 14. At this moment, the rangefinder reaches parallelism and the drive mechanism is stopped. The photographic lens can be accurately focused on the target object.

Regarding the infrared rangefinder 12, only an infrared sensing element 14 in the form of a photodiode P is shown in FIG.

The reflex finder 11 of the reflex camera is
A screen 16 arranged in the viewfinder image plane 15, which is indicated by a dotted line in a known manner, moves from the pen aiming object to the photographing lens 1.
0 and is reflected by the rotating mirror 19 toward the finder image plane 15 in a known manner, forming a left-right inverted image of the subject on the finder image plane 15 on the screen 16, and the face image is formed by a pentaprism. 17 is converted into a normal image and is viewed as a normal image within the eyepiece lens 18 of the finder. In order to take a photograph, the rotating mirror is rotated in the direction of the finder image plane 15, so that the optical path is opened toward the film plane 2o, and the subject is sharply imaged from the photographing lens 10 onto the image plane 20. and exposed to film.

In order to extract an infrared image from the finder optical path of the reflex finder 11, an infrared reflecting mirror surface 21 is provided in the finder optical path, and the infrared image formed on the aiming object is formed on the mirror surface and is extracted from there. The direction is changed towards the infrared sensing element 14. In particular, it is clear from FIG. 2 that this infrared reflecting mirror surface 21 is contained within an infrared screen 22 located at or near the finder image plane 15. The infrared screen 22 is arranged parallel to the screen 16, and the mirror surface 21 has an inclination angle α-4 with respect to the screen in the embodiment of FIG.
The infrared sensing element 14 is arranged on the left edge of the infrared screen 22 in FIG. 1 and on the right edge in FIG. The infrared screen 22 is divided into two halves 24 at an angle of inclination α=45° perpendicular to the longitudinal axis.
It is divided into 25 parts. The cut surface 26 of one of the screen halves 25 is treated so that infrared rays are reflected at a surface section 27 located at the lower edge of the center of the cut surface 26. Both screen halves 24, 25 are rejoined at the cut surface 26 with an optically transparent adhesive, thereby forming the third
A complete infrared screen 22 encapsulating an infrared reflective mirror surface 21 is produced, shown in the bottom view of the figure. The other end surface 2 on the opposite side of the end surface 23 on which the infrared sensing element 14 is mounted
8 is formed into an arc shape and is mirror-finished, so that infrared rays reflected from the mirror surface 21 are similarly reflected by the end surface 28. In this case, the arcuate end surface 28 is curved so that the reflected infrared rays are concentrated on the infrared sensing element 14 on the opposite side. The thickness of the infrared screen 22 is about 1 mm.

The mirror surface 21 has an extremely small area and a′<.

~Author. It has a side length of 1. Such a small area mirror surface 21
Of course, the rangefinder 12 is used for distance measurement of stationary objects and the rangefinder drive is controlled in such a way that the rangefinder is always adjusted to the camera's shortest focusing distance at the start of every distance measurement. This is possible only when

In this case, from this adjustment position, the drive device directs the direction of the infrared rays emitted from the distance adjustment ring of the photographic lens 10 and also from the light emitter towards a long distance so that the infrared image appears on the mirror surface 2.
until it reaches the edge 29 of 1. The infrared sensing element 14 then receives the reflected light and shuts off the drive. The prerequisite in this case is that the infrared image scanning of the rangefinder 12 is performed on the mirror surface 21 as indicated by the double arrow 31 in FIG.
It is carried out parallel to the extended plane of . However, the infrared image scanning can also be carried out perpendicularly thereto, ie perpendicular to the extension plane of the mirror surface 21, in which case the edge 30 of course scans the position of the infrared image.

If the taking lens adjustment should track changes in the distance of the subject, as is particularly desired in a lotus camera, the mirror surface 2
1 must be chosen to be large in the direction of the double arrow 31 in FIG. In this case, the longitudinal axis of the mirror surface 21 is parallel to the direction of movement of the infrared image scan. The length of the mirror surface 21 is determined by the formula: [In the formula, f is the focal length of the photographic lens 10, b is the optical center-to-center distance between the photographic lens and the infrared emitter, and po is the shortest photographic distance of the photographic lens.] stipulated based on

In the cameras shown in Figures 1 to 4, the infrared screen 2
2 is placed directly on the viewfinder image plane 15, so that the infrared and visible images are sharply focused when the rangefinder is in equilibrium and the driving device is shut off and accurate taking lens adjustment is performed. be done.

5 and 46, for structural reasons, only the infrared screen 22 is placed at a distance from the finder image plane 15, and moreover, as in the previous embodiment, it is arranged between the finder screen 15 and the rotating mirror 19. Examples of cameras capable of this are shown. In this case, the rotating mirror 19 is provided with another reflective surface 32 in addition to the reflective surface 40, and the infrared rays are reflected by this reflective surface.

In FIGS. 5 and 6, the reflective surface 32 is arranged on the rear surface 33 of the swiveling mirror 19, this being achieved by mirroring the rear surface of the swiveling mirror 19 accordingly. When the reflective surface 32 is provided in this way, the distance a from the finder image surface 15 of the infrared image surface generated at the lower edge of the infrared screen 22 in the arrangement format of the mirror surface 21 selected in FIGS. 2 to 4 is calculated by the formula: It is defined based on the % formula % (where h is the thickness of the rotating mirror 19 and n is the refractive index of the rotating mirror). In this case as well, when the rangefinder 12 is in an equilibrium state in which the distance adjustment device and the drive device for turning the optical path are stopped, a visible image is sharply formed on the finder image plane 15 and an infrared image is sharply formed on the infrared image plane 34. Ru.

In order to further increase the distance between the two image planes 15 and 34, the reflective surface 32 can additionally be made convex, as shown in FIG.

In all three embodiments of the reflex camera, in the balanced state of the rangefinder, the visible image is sharply focused on the viewfinder image plane 15 and the infrared image is sharply focused on the infrared image plane 34. However, it is unnecessary to focus two images simultaneously in this way. First, a measurement is made on the image plane of the infrared image selected for the infrared image (in which plane the edge 30 of the mirror surface 21 lies), while the taking lens can of course be adjusted in accordance with the adjustment of the rangefinder. It is. Immediately thereafter, the taking lens is additionally adjusted by an amount corresponding to the distance between the two surfaces lδ and 34. By means of this measure, a good focusing is achieved for the infrared image during the distance measurement, and an equally good focusing for the visible image subsequently recorded on the screen and thus on the film.

In order to carry out temporally continuous focusing of the infrared image and the visible image, once an equilibrium state is achieved with the rangefinder 12,
A control circuit is provided which initiates an additional adjustment of the taking lens towards a longer distance by an amount corresponding to the distance between the viewfinder image plane 15 and the infrared image plane 34. In this case, the infrared image plane 34 is similarly located between the finder image plane 15 and the rotating mirror 19. This additional distance adjustment amount of the photographic lens is constant for each photographic lens. The camera is particularly suitable for various infrared-corrected interchangeable lenses in which the visible image focus plane, ie the viewfinder image plane 15, is more or less distant from the infrared wavelength focus plane. All types of taking lenses require specific correction conditions that must be adjusted over the equilibrium state in order to take into account the small field movements characteristic of all taking lenses.

The reflex camera shown in cross section in FIG. 7 has an infrared reflecting mirror surface 2 in the finder optical path in order to extract an infrared image, which is different from the embodiments described so far.
1 is placed. To the extent that the components of the camera of FIG. 7 correspond to the components of the camera described above, they are indicated by the same reference numerals plus 100.

The camera also has a photographic lens 110, a reflex finder 111, and an infrared rangefinder 112. Similarly, a screen 11 is placed on the finder image plane 115 in the finder optical path.
6 is arranged, and when the photographing lens 110 is accurately focused on the screen, a sharp visible image is formed through the rotating mirror 119. A pentaprism 117 is disposed between the finder image plane 115 and the eyepiece lens 118, and this prism changes the left-right inverted visible image on the screen 116 into a normal image. Regarding the distance meter 112, an infrared sensing element 1 similarly configured as a photodiode is used.
Only 14 are shown.

In order to extract an infrared image, an infrared reflecting ψ surface 121 is provided on the curve 121 of the plano-convex lens 136. The lens is placed on the lower end surface 137 of the pentaprism 117 opposite the eyepiece. This end face 137 is configured to transmit infrared rays. The radius of curvature of the curved surface 135 is selected such that the infrared image reflected by the mirror surface 121 is imaged onto the photosensitive element 114 located on the back surface 138 of the pentaprism 117 facing the eyepiece 118 .

FIG. 8 shows a reflex camera with a further embodiment of the rangefinder, slightly modified with respect to FIGS. 1-4. Therefore, the same components are given the same reference numerals.

A significant difference lies primarily in the arrangement of the infrared screen 22, which in this case is located on the opposite side of the viewfinder image plane 15 from the swiveling mirror 19, ie between the screen 16 and the pentaprism 17. The distance d from the surface of the infrared screen 22 facing the screen 16' in the infrared image plane 34 to the matte surface 41 of the screen 16 in the finder image plane 15 is such that the finder image is the same as the viewfinder image at the same photographing lens adjustment position. The choice is such that the infrared image is sharply focused on the surface 15 and on the infrared juxtaposition 34. In this case, the distance d is actually approximately 14°. The matte surface 41 of the scrizi has a central unmatted notch 42 so that the light path can form an infrared image at the edge of the infrared reflecting mirror surface 21.

In this arrangement of the infrared screen 22, the inclination of the infrared reflecting mirror surface 21 is advantageously selected as a function of the maximum aperture ratio of the objective lens 10.

With a shooting lens aperture ratio of 1:1.4, the tilt angle is up to 6
2°. The unbrushed notch in the screen 16 is 3.5 x '10-. It requires only 2 tan, is therefore extremely small, and does not interfere with the finder image at all.

The rangefinder in the reflex camera in Figure 6 and the
Another difference from what has been described in FIGS.

The light emitter is constructed as a laser diode (43) and is fixedly arranged within the camera cavity. With an infrared reflector fixedly connected to the swiveling mirror 19, the emitted light is diverted to pass through a pupil portion of the taking lens 10 which is offset with respect to the optical axis of the taking lens 10. Therefore, this emitted light passes through the photographing lens 10 at a dispersion angle ε.

That is, the photographing lens 10 automatically adjusts the focus, that is, in the equilibrium state, is focused on the object, and produces a sharp image of the light emitter, ie, the laser diode P43, on the object. The returned image of the light emitter is sharply formed on the infrared reflecting mirror surface 21 of the infrared screen 22 through the photographing lens 10 at the center. If it is not in equilibrium, that is, if the photographing lens is not set at the correct distance to the subject, the infrared image will move based on the dispersion angle ε.

Of course, the infrared screen 22 is the screen 1 as described above.
The advantage of the above-mentioned rangefinder variant is that there are special demands on the working connection between the taking lens and the light emitter and on the directional accuracy of the optical axis - It's because it's unnecessary. It is not an essential requirement to arrange the reflecting mirror 44 behind the rotating mirror 19.

Depending on the respective position of the laser diode 43, the reflector 44 can be arranged in front of the swiveling mirror 19. In this case, the mirror 44 should be transparent to visible light.

In the infrared screen 22' schematically illustrated in FIG.
3' are on the opposite side. This end surface 23' is mirror-finished, except for the contact surface of the infrared sensing element 14', as shown by hatched lines in FIG. In this arrangement, the infrared radiation deflected by the mirror surface 21' is reflected by the mirrored portion of the end face 23' and impinges on the opposite arcuate end face 28'. From there, the infrared radiation is reflected towards the sensing element. The infrared light path is marked in FIG. 9 and marked with an arrow.

In this embodiment of the infrared screen 22', the infrared sensing element 14' can be configured significantly smaller than in the infrared screens of FIGS. 2-4.

As described above, in the infrared screen 22, the minimum length of the infrared reflecting mirror surface 21 is calculated based on the formula: In this case, as schematically illustrated in FIG.
If the rangefinder is constructed in such a way that an additional diverging light beam 47 is emitted from the sensor and traverses within the sensing range 9 immediately following the shortest photographing distance p0 of the taking lens 10, the minimum length of the mirror surface 21 can be significantly reduced. Can be shortened.

In the case of f=50 mm and b=40 m+n, the minimum reflecting mirror length is only t-5rrrrn when the shortest photographing distance is 0.4 m, and the minimum length of the mirror surface 21 is only l-Mn when the shortest photographing distance is 2 m. In the modified form of emitted light shown in Fig. 10, the shortest shooting distance is 0.4 m, and the maximum /J・Reflecting mirror surface length L
= l mm, since the object within the measuring distance range 49 is illuminated by a divergent light beam and the light ray returning from the object reaches the sensing element 15 via the shortest mirror surface 21. be. In this configuration,
The drive motor for adjusting the objective lens is necessary for continuous movement in the direction of a short distance when the object is at a shorter distance even though the length of the mirror surface 21 corresponds to the minimum distance of 2 m. Get information.

The generation of a divergent luminous flux is achieved by, for example, a part of the emitted light beam being emitted from the light emitter 4.
6 or by a diverging prism in the lateral section of the collimated beam 50 and deflected.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view of a reflex camera, Figure 2
Exploded perspective view of the infrared screen of the camera shown in Figure 3.
The figure is a perspective view of the combination of the infrared screen shown in FIG. 2, FIG. 4 is a view showing the infrared light path in the infrared screen, and FIG. 5 is a view partially showing the finder light path of the camera of the second embodiment.
FIG. 6 is a diagram showing the finder optical path of the camera according to the third embodiment, FIG. 7 is a partial cross-sectional view in the optical axis direction of the reflex camera according to the fourth embodiment, and FIG. 8 is a diagram showing the reflex camera according to the fifth embodiment. FIG. 9 is a partial cross-sectional view of the camera in the optical axis direction, FIG. 9 is a schematic diagram of an infrared screen of another embodiment, and FIG. 10 is a schematic diagram of the emission light path of the modified rangefinder.

Claims (1)

[Claims] 1. A photographic lens, a reflective finder in which an optical path is guided through the photographic lens via a light-converting internal member, and an active infrared rangefinder, the rangefinder having an infrared sensing element. The distance meter is equipped with a light receiver, and an infrared image formed from the light emitting device of the rangefinder on the target object is formed on the light receiver via a photographic lens and a mirror surface that reflects infrared rays arranged in the finder optical path. In a photographic or cine camera, there is an infrared screen (22) at or near the viewfinder image plane (15).
is arranged, and the mirror surface (21) that reflects infrared rays in the infrared screen (22) forms an inclined angle (α) with respect to the screen surface, and the infrared sensing element (14) is located in the infrared screen (22). Photographic or cine camera, characterized in that it is arranged at or near the end face (23). 2. The infrared screen (22) covers at least the entire field of view of the finder, and the infrared sensing element (14) is mounted directly on the end face (23) of the infrared screen (22). camera. 3. The infrared screen (22) is the finder image plane (1δ)
and has an infrared reflecting mirror surface (2
The camera according to claim 1 or 2, wherein the angle of inclination (α) of 1) is approximately 45°. The raw, infrared screen (22) is divided in the direction perpendicular to its longitudinal axis at the same angle as the inclination angle (α) of the infrared reflecting mirror surface (21), and the cut surface ( 26) is treated to reflect infrared radiation and the cut surfaces (26) of the screen portions (24, 25) are joined with an optically transparent adhesive. The camera according to any one of items 1 to 3. 5. End surface (23) where the infrared sensing element (14) is arranged
The i-side (28) of the infrared screen (22), opposite the
) is mirror-finished and shaped into an arc so that the infrared rays reflected there hit the infrared sensing element (14). Cameras listed in. 6. The camera according to any one of claims 1 to 5, wherein the height of the infrared screen (22) is about one. 7. The infrared reflecting mirror surface (21) has a width and a length of 1. ~
Heat. The method according to any one of claims 4 to 6, having the dimensions of the throat. 8. The width of the infrared reflecting mirror surface (21) measured in the direction of inclination of the cut surface (26) is 1/~'/, and the length 1-1 measured in the direction perpendicular to it is T). where f is the focal length of the photographic lens (10), b is the distance from the optical axis of the light emitter that emits converged infrared rays to the optical axis 1 of the photographic lens, and p. The camera according to any one of claims 4 to 6, wherein is the shortest photographing distance defined by the photographic lens (10). 9. The infrared screen (22) is the finder image plane (15)
9. The method as claimed in claim 1, wherein the light-directing element (19) is advantageously arranged directly between the viewfinder screen (15). 10. The infrared screen (22) is the light turning member (19)
) and a viewfinder image plane (15) at a distance from said image plane, the front infrared transparent light beam having a light turning member (19) facing towards the photographic lens (10). a reflective surface (40); an infrared reflective surface (40) that reflects infrared rays at a distance from and parallel to the reflective surface;
32) The camera according to any one of claims 3 to 8. 11. The camera according to claim 10, wherein the rear infrared reflecting surface (32) is formed in a convex shape. 12, equipped with an electric distance adjustment device that is controlled by the rangefinder and stops when an equilibrium state corresponding to the actual object distance is achieved in the rangefinder, and is equipped with an infrared long Tallinn (22
) is arranged between the light deflecting member (19) and the finder image plane (15) at a distance from said image plane, and when equilibrium is reached in the rangefinder (12), the infrared screen (22) initiates an additional substantially constant taking lens adjustment of a large distance-directed amount corresponding to the distance from the infrared image plane (34) formed in the viewfinder image plane (15); The camera according to any one of claims 3 to 8, which is provided with a control circuit. 13. A pentasolism is arranged between the finder image plane and the finder eyepiece, and the eyepiece (
The end face (137) of the pentasolism (117) opposite to the pentasolism (118) is configured to be infrared transparent, and a plano-convex lens (136) is arranged on the outer surface of the end face (1'37). -B, an infrared reflecting mirror surface (121) is arranged on the curved surface (135) of the lens, and the curved surface (135)
The radius of curvature of 135) forms an infrared image reflected by the mirror surface (121) onto an infrared sensing element (114) placed on the back side (138) of the pentasolism (117) facing the eyepiece (118). A photographic or cine camera according to claim 1, which is selected as follows. 14. The infrared screen (22) is located on the finder image plane (
15) at a distance (d) such that the finder image is sharply formed on the finder image plane (15) and the infrared image is sharply formed on the infrared image plane (34) at the same time. The camera according to any one of claims 1 to 8, wherein: 15. Finder image plane (15) and infrared image plane (34)
) The camera according to claim 14, wherein the distance between the camera and the camera is 10 minutes. 16. Having a mud screen, the matte surface (41)
16. Camera according to claim 14, characterized in that it has a non-matte cutout (42) located in the viewfinder image plane and centrally arranged. 17. The end surface (23') of the infrared screen (22") that supports the infrared sensing element (14') is a mirror surface (21')
and the supporting surface of the infrared sensing element (141) (
Claim 5, which is mirror-finished with 45) spaced apart.
Camera mentioned in section. 18. The infrared reflecting mirror surface (21) is measured in a direction perpendicular to the inclination direction of the cut surface (26), and the middle f is the photographic lens;
1? The focal length of (10), b is from the optical axis of the light emitter (46) that emits converged infrared rays to the optical axis of the photographing lens (48)
po represents the shortest photographing distance defined by the photographic lens (10), and a diverging luminous flux (47) is emitted from the emitter luminous flux (50), and the diverging luminous flux is emitted from the photographing lens (10). The optical axis (48) is connected to a distance range (49) directly following the shortest photographing distance (po) of the photographic lens (10).
7. A camera according to any one of claims 4 to 6, wherein the camera is oriented transversely within ). 19. Claims 14 to 18, characterized in that the emitter light rays starting from the emitter (43) of the rangefinder are guided via an infrared reflector (44) in a dispersive manner through the taking lens (10). The camera according to any one of paragraphs. 20. The infrared reflecting mirror (44) is a light turning member (19)
20. A camera according to claim 19, wherein the camera is fixedly connected to a camera.