Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B27/00—Photographic printing apparatus
  • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
  • G03B27/52—Details
  • G03B27/68—Introducing or correcting distortion, e.g. in connection with oblique projection
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B19/00—Cameras
  • G03B19/02—Still-picture cameras
  • G03B19/10—Plate or cut-film cameras

Definitions

• the present invention relates to a specialist camera with a rail which forms the camera base and is tiltable with respect to the horizontal and with a lens and an image standard which can be moved independently of one another on this rail and on which a lens or, respectively, pivotable about at least one axis aligned transversely to the camera base.
• Image carrier is arranged and with a screen provided for attachment to the image carrier, which has at least two adjustment lines running parallel to the pivot axis of this carrier.
• the image plane and / or the main plane of the lens must be pivoted in such a way that their extensions coincide with the extension of the line connecting the objects to be imaged at a common point to cut. Because the objects to be imaged are usually offset from one another both laterally and vertically, the lens and image carrier of a compartment camera can be pivoted about two axes oriented perpendicular to one another and transversely to the camera base, so that the above-mentioned imaging condition can be met.
• the Swivel joint is arranged below the horizontal swivel axis, causing a lateral displacement of the image on the image carrier.
• the present invention is therefore based on the object of creating a specialist camera in which to sharply image two objects with different object widths required pivoting of the image plane is calculated from the longitudinal displacement and the image standard on the camera base and the distance of the image points measured perpendicular to the pivot axis on a vertical image plane, regardless of the inclination of the camera base.
• this object is achieved with a specialist camera of the type described at the outset, which is characterized in that the rail forming the camera base is assigned an electronic sensor for the angle of inclination and at least the image standard is associated with an electronic sensor for moving it along the camera base, and further an electronic circuit is provided, from the measured values entered for the distance between the two pixels on the focusing screen measured perpendicular to the swivel axis and for the angle of inclination of the camera base and for the displacement of the vertical image standard along the camera base, for the simultaneous sharp imaging of the two pixels on the The required pan angle is calculated for the image carrier.
• Fig. 1 shows the schematic diagram for determining the pivoting of an image carrier in order to sharply image two objects at different distances from the taking lens on a focusing screen at the same time as well as the oblique-angled triangle, with the aid of which the required pivoting angle can be calculated if the camera base is inclined with respect to the horizontal and the picture carrier is vertical,
• Fig. 2 shows the preferred embodiment of a focusing screen for insertion into the image carrier while dividing the camera
• FIG. 3 shows the block diagram of a possible embodiment of the electronic evaluation circuit.
• 1 shows a camera base 10, which is inclined by the angle ⁇ with respect to the horizontal 11, as well as the vertically aligned main plane 12 of a lens and the image plane 13 of an image carrier.
• 1 shows two objects 14 and 16 (or parts of an object).
• the distance of the object 14 from the lens is smaller than the corresponding distance of the object 16.
• the image standard (not shown) in position 17 of the camera base and for sharply imaging the lens distant Object 16 must be pushed into the position 18 by the distance ⁇ S.
• the vertical distance between the in the image plane, or the lines running through these points and parallel to the horizontal pivot axis of the image standard, the length d is.
• the oblique-angled triangle is simply supplemented into a right-angled triangle 22, 25, 24.
• the height (counter cathode) of this right-angled triangle is ⁇ S -cos ⁇ according to the known trigonometric functions.
• a focusing screen according to FIG. 2 is preferably used.
• This focusing screen has lines aligned at right angles to one another, which form an adjustment grid and are identified by letters.
• the distance between adjacent setting lines is predetermined and constant and is, for example, 10 mm. This division of the focusing screen enables the position of each point depicted on it and the distance between two points required for the calculation of the swivel angle described above to be specified.
• a rack is embedded in the base, and the standard has a pinion that engages in this rack.
• the pinion interacts with an electromechanical pulse generator that generates pulses when the standard is moved, the number of which is proportional to the length of the shift.
• a potentiometer can be used, which is arranged on the joint that connects the camera base to a tripod.
• pulse generator and potentiometer that can be used for the described purpose are known to any person skilled in the art, which is why their detailed description is expressly omitted here.
• FIG. 3 shows the block diagram of an embodiment of the electronic circuit which, from the entered values for the angle of inclination ⁇ , the displacement path ⁇ S and the distance d between the pixels, the sought pivot angle calculated.
• the circuit contains a central processing unit 30 with a tail unit 31 and associated register 32, an arithmetic unit 33 and a working memory 34, all of which are connected to one another by means of a data bus 36 and control lines (not shown).
• the central unit is preferably designed as a microprocessor.
• a first input device 37 is provided for the angle of inclination ⁇ and, as already described, contains a potentiometer which generates an analog output signal which corresponds to the inclination of the camera base arranged on a tripod with respect to the horizontal.
• An analog / digital converter 38 is assigned to this input device, which converts the output signal of the potentiometer into a digital signal which is fed to the data bus 36 of the central unit via a first data line 39.
• a second input device 42 is designed as a pulse generator which, when the image standard is moved along the camera base, generates a pulse train whose number of pulses is proportional to the displacement ⁇ -f.
• a counter 43 is assigned to the impluser, which counter is reset to zero before the start of a camera setting and which is shifted by one distance during the shift of the image standard
• a third input device 46 is designed as a keypad into which the coordinates determining the spacing of the pixels on the focusing screen are keyed in and which forwards the corresponding data via data line 47 to data bus 36.
• the circuit also includes a data output device 48 which is connected to the data bus 49 via a data line 41.
• the data output device is simply designed as an optical display device on its screen or display elements the desired angle value appears.
• the camera base is first inclined such that the object to be photographed or the objects appear on the focusing screen with the desired viewing angle.
• the required angle of inclination ⁇ then forms the signal at the output of the analog / digital converter 37.
• the (vertically standing) focusing screen is shifted along the camera base until a first desired object or part of an object is sharply imaged.
• the counter 43 is then reset to zero and then the focusing screen is shifted until a second desired object or another part of an object is sharply imaged.
• the number of pulses corresponding to the displacement path ⁇ S then appears as the output signal of the counter 43.
• the indices of those setting lines on or near which the two objects or parts of objects are sharply imaged are entered into the keypad 46 at the output thereof a digital signal appears that corresponds to the distance d measured across the direction of these setting lines.
• the cos of the set angle of inclination ⁇ is then called up from the working memory, multiplied by the value for the path ⁇ S and the product Cos ⁇ ⁇ S is temporarily stored. Then the s / ln of the angle of inclination ⁇ is called up, multiplied by the value for the path ⁇ s and the distance d between the setting lines is added to this product and the sum d + sin ⁇ . ⁇ S is stored temporarily. The quotient is then made from the two temporarily stored values
• the camera according to the invention is also suitable for calculating the pivoting angle about the second (vertical) axis is.
• a measuring transducer 37 ' is also assigned to the vertical swivel axis, and that the horizontal distance between the two setting lines, on or near which the two pixels lie, as distance d' in adapted third input device 46 'is keyed in.
• the transducer for the Schwen kung and the shift do not necessarily have to be arranged only on the image standard or on the carrier, but can just as well be arranged on the lens standard or carrier or on both. It is also possible to transfer a calculated setting from the image carrier to the lens carrier (or vice versa) instead of or in addition to the data output device, to arrange further measuring sensors and to use an electronic monitoring circuit which generates a signal when the pivoting of the objective or the image carrier of the calculated one Swivel corresponds. Finally, it is possible to further expand the electronic circuit and not only to use it to calculate the swivel angle or angles, but also to automatically set the shutter speed and / or aperture.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Stereoscopic And Panoramic Photography (AREA)
• Focusing (AREA)
• Automatic Focus Adjustment (AREA)
• Indication In Cameras, And Counting Of Exposures (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4283796

Family Applications (1)

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Cited By (2)

Families Citing this family (6)

Citations (4)

Family Cites Families (4)

• 1984
  • 1984-10-10 CH CH4859/84A patent/CH665035A5/de not_active IP Right Cessation
• 1985
  • 1985-10-09 WO PCT/CH1985/000152 patent/WO1986002465A1/de not_active Ceased
  • 1985-10-09 US US06/894,672 patent/US4692007A/en not_active Expired - Lifetime
  • 1985-10-09 DE DE3590504A patent/DE3590504C1/de not_active Expired
  • 1985-10-09 DE DE85CH8500152D patent/DE3590504D2/de not_active Expired

Patent Citations (4)

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