Photographic focusing screen camera

Claim 2

Photographic focusing screen camera including an image receiver carrier and a lens carrier having a camera lens mounted thereon, an elongated camera base, said carriers each being mounted on said base, a focusing arrangement having means for varying the focus distance between said carriers provided for at least one of said carriers, a swinging arrangement provided for said one carrier and having means for swinging it about a swing axis relative to the other of said carriers, said swinging arrangement being provided with first scale means for the swing angle and an accompanying first pointer means for reading the adjusted swing position of said one carrier as compared to a basic zero position thereof, said first scale means having a scale element graduated in units of angular measurement, said image carrier having a focusing screen mounted thereon with at least one pair of spaced first markings located at a predetermined distance from one another for determining limitations of a measuring basis on said screen, which measuring basis extending perpendicularly to said swing axis of said one carrier, said means for varying the focus distance between said carriers being provided with second scale means and an accompanying second pointer means for a measuring angle, said second scale means having a scale element graduated in units of angular measurement developed according to the formula: sin Alpha Delta S/M where M is the dimension of said measuring basis in units of linear measurement, Delta S is a difference in focus distances between said lens and said markings on said screen in the same units of linear measurement, i.e., the extent of the necessary shift of said focusing arrangement for changing the sharp focusing of images produced on one and the other of said markings of two parts of an object lying at different disTances from said lens, and Alpha is the angle by which said one carrier is to be swung in order to simultaneously focus sharp images of the two parts of the object on said two markings.

Claim 3

Camera as in claim 1, wherein the scale elements of said first and second scale means are graduated in the same units of angular measurement.

Claim 4

Photographic focusing screen camera including an image receiver carrier and a lens carrier having a camera lens mounted thereon, an elongated camera base, said carriers each being mounted on said base, a focusing arrangement having means for varying the focus distance between said carriers provided for at least one of said carriers, a swinging arrangement provided for said one carrier and having means for swinging it about a swing axis relative to the other of said carriers, said swinging arrangement being provided with first scale means for the swing angle and an accompanying first pointer means for reading the adjusted swing position of said one carrier as compared to a basic zero position thereof, said first scale means having a scale element graduated in units of angular measurement, said image carrier having a focusing screen mounted thereon with at least one pair of spaced first markings located at a predetermined distance from one another for determining limitations of a measuring basis on said screen, which measuring basis extends perpendicularly to said swing axis of said one carrier, said means for varying the focus distance between said carriers being provided with second scale means and an accompanying second pointer means for a measuring angle, said second scale means having a scale element graduated in units of angular measurement developed according to the formula: sin Alpha Delta S/M whereby M is the dimension of said measuring basis in units of linear measurement, Delta S is a difference in focus distances between said lens and said markings on said screen in the same units of linear measurement, i.e., the extent of the necessary shift of said focusing arrangement for changing the sharp focusing of images produced on one and the other of said markings of two parts of an object lying at different distances from said lens, and Alpha the angle by which said one carrier is to be swung in order to simultaneously focus sharp images of the two parts of the object on said two markings, the graduations of said scale element of the measuring angle and said scale element of the swing angle having a zero point and extending in opposite directions therefrom, the graduations being variably marked in said directions in such a manner as to indicate the directions of the scale of the measuring angle and of the scale of the swing angle, corresponding one to the other.

Claim 5

Photographic focusing screen camera including an image receiver carrier and a lens carrier having a camera lens mounted thereon, an elongated camera base, said carriers each being mounted on said base, a focusing arrangement having means for varying the focus distance between said carriers provided for at least one of said carriers, a swinging arrangement provided for said one carrier and having means for swinging it about a swing axis relative to the other of said carriers, said swinging arrangement being provided with first scale means for the swing angle and an accompanying first pointer means for reading the adjusted swing position of said one carrier as compared to a basic zero position thereof, said first scale means having a scale element graduated in units of angular measurement, said image carrier having a focusing screen mounted thereon with at least one pair of spaced first markings located at a predetermined distance from one another for determining limitations of a measuring basis on said screen, which measuring basis extends perpendicularly to said swing axis of said one carrier, said means for varying the focus distance between said carriers being provided with second scale means and an accompanying second pointer means for a measuring angle, said second scale means having a scale element graduated in units of angular measurement developed according to the formula: sin Alpha Delta S/M whereby M is the dimension of said measuring basis in units of linear measurement, Delta S is a difference in focus distances between said lens and said markings on said screen in the same units of linear measurement, i.e., the extent of the necessary shift of said focusing arrangement for changing the sharp focusing of images produced on one and the other of said markings of two parts of an object lying at different distances from said lens, and Alpha the angle by which said one carrier is to be swung in order to simultaneously focus sharp images of the two parts of the object on said two markings, the graduations of said scale element of the measuring angle and said scale element of the swing angle having a zero point and extending in opposite directions therefrom, the graduations being variably marked in said directions in such a manner as to indicate the directions of the scale of the measuring angle and of the scale of the swing angle, corresponding one to the other.

Claim 6

Camera as in claim 3, wherein said second pointer means for said second scale means of said focusing arrangement is mounted for adjustable movement in longitudinal direction of the scale of the measuring angle.

Claim 7

Camera as in claim 4, wherein said second pointer means includes a pointer for said scale element of said second scale means, and wherein said scale element and said second pointer means are provided with means for setting said pointer at a desired basic position with respect to said scale.

Claim 8

Camera as in claim 3, wherein said scale element of said second scale means of the focusing arrangement is mounted for adjustable movement with respect to said second pointer means.

Claim 9

Camera as in claim 6, wherein said second scale means and said second pointer means are provided with means for setting said scale element of the second scale means at a desired basic position with respect to the scale of the measuring angle.

Claim 10

Camera as in claim 3, wherein said focusing arrangement includes a holder element for mounting said one carrier on said base, and further includes a yoke member supporting said one carrier on said holder element for shifting movement in relation thereto, said scale element of said second scale means of the focusing arrangement being lOcated on one of said holder element and yoke member, and said second pointer means being located on the other of said yoke member and holder element, and the graduations of said scale element of said second scale means being disposed along a straight line.

Claim 11

Camera as in claim 3, wherein said focusing arrangement includes a precision drive having adjacent stationary and rotatable members, said second scale means being located at one of said stationary and rotatable members and the second pointer means being located at the other of said stationary and rotatable members, whereby the graduations of said scale element of said second scale means are disposed along a curved course.

Claim 12

Camera as in claim 3, wherein said scale element of said second scale means has directional arrows for indicating the direction of swing of said one carrier required for producing a correction of focus sharpness.

Claim 13

Camera as in claim 3, wherein at least two image carriers and focusing screens of different size are provided and adapted to be mounted and used selectively, said focusing screens each having markings for determining limitations of differently dimensioned measuring bases, and wherein at least two differently graduated scale elements of the second scale means of the focusing arrangement are provided, in correspondence with said different measuring bases.

Claim 14

Camera as in claim 11, wherein said scale element of the second scale means is removably and exchangeably mounted at said focusing arrangement.

Claim 15

Camera as in claim 3, wherein said pair of markings are constituted by straight parallel lines spaced from one another by a distance equal to the dimension of said measuring basis.

Claim 16

Camera as in claim 3, wherein said focusing screen is provided with a second pair of spaced markings located at a predetermined distance from one another for determining limitations of a second measuring bases which extend in a direction at right angles to said first named measuring basis, the first and second measuring basis having equal dimensions.

Claim 17

Camera as in claim 14, wherein said first and second pair of markings are each constituted by straight parallel lines spaced from one another by a distance equal to the dimension of said measuring basis.

Claim 18

Camera as in claim 15, wherein the markings together form a square having a center which coincides with a center of said focusing screen.

Claim 19

Camera as in claim 3, wherein said markings are adapted to be moved on said focusing screen, the distance between said markings being constant.

Claim 20

Camera as claimed in claim 3, wherein said focusing screen has at least two pairs of markings located at different predetermined distances from one another for determining limitations of at least two differently dimensioned measuring bases, and wherein said second scale means of said focusing arrangement is provided with at least two differently graduated scale elements, in correspodence with said different measuring bases.