US4336996A — Variable-focal-length objective and an optical sy…

Claim 1

Independent Claim 268 words

A variable-focal-length objective which is intended to equip optical printers and caption stands for the production of special effects on films, wherein said objective is constituted by four groups of lenses, viz: a first convergent group of four lenses, a second divergent group of four lenses, a third convergent group of six lenses, a fourth convergent group of two lenses, the first and third groups being coupled together and movable, and wherein said objective has the following lens formula in which: R is the radius of curvature of the successive faces of the lenses with a precision of 0.002 mm, E is the thickness of the lenses in millimeters with a precision of 0.1 mm, Nd is the refractive index of the lenses, NU (ν) is a complementary characteristic of the lenses. ______________________________________ R E Nd NU ______________________________________ 1 PLANE 3.00000 1.696500 36.5 2 103.0000 6.00000 1.697000 56 3 -202.4481 0.10000 AIR GROUP 4 109.0000 1 5.50000 1.697000 56 5 -184.0000 0.05000 AIR 6 -175.8000 3.00000 1.696500 36.5 7 264.6000 45.86100 AIR 8 -102.2700 2.00000 1.464500 65.7 9 83.8300 3.50000 1.740000 28.1 10 163.9200 1.50000 AIR GROUP 11 -200.3200 2 2.00000 1.464500 65.7 12 59.8200 3.50000 1.740000 28.1 13 91.8607 46.76600 AIR 14 1991.4000 3.0000 1.613099 44.4 15 200.0000 6.00000 1.608750 59 16 -185.8000 0.10000 AIR GROUP 17 -212.8000 3 5.00000 1.608750 59 18 -91.9756 0.10000 AIR 19 PLANE 6.00000 1.608750 59 20 -65.0000 3.00000 1.613099 44.4 21 65.0000 6.00000 1.608750 59 22 PLANE 47.34500 AIR 23 93.2200 7.00000 1.603500 64 GROUP 24 -135.8300 4 0.50000 AIR 25 -114.6300 - 3.00000 1.613099 44.4 26 242.800 121.53047 AIR. ______________________________________

Claim 2

Dependent Claim 268 words

A variable-focal-length objective which is intended to equip optical printers and caption stands for the production of special effects on films, wherein said objective is constituted by four groups of lenses, viz: a first convergent group of four lenses, a second divergent group of four lenses, a third convergent group of six lenses, a fourth convergent group of two lenses, the first and third groups being coupled together and movable, and wherein said objective has the following lens formula in which: R is the radius of curvature of the successive faces of the lenses with a precision of 0.002 mm, E is the thickness of the lenses in millimeters with a precision of 0.1 mm, Nd is the refractive index of the lenses, NU (ν) is a complementary characteristic of the lenses. ______________________________________ R E Nd NU ______________________________________ 1 PLANE 3.00000 1.696500 36.5 2 103.0000 6.00000 1.697000 56 3 -202.4481 0.10000 AIR GROUP 4 109.0000 1 5.50000 1.697000 56 5 -184.0000 0.05000 AIR 6 -175.8000 3.00000 1.696500 36.5 7 264.6000 45.86100 AIR 8 -102.2700 2.00000 1.464500 65.7 9 83.8300 3.50000 1.740000 28.1 10 163.9200 1.50000 AIR GROUP 11 -200.3200 2 2.00000 1.464500 65.7 12 59.8200 3.50000 1.740000 28.1 13 91.8607 46.76600 AIR 14 1991.4000 3.0000 1.613099 44.4 15 200.0000 6.00000 1.608750 59 16 -185.8000 0.10000 AIR GROUP 17 -212.8000 3 5.00000 1.608750 59 18 -91.9756 0.10000 AIR 19 PLANE 6.00000 1.608750 59 20 -65.0000 3.00000 1.613099 44.4 21 65.0000 6.00000 1.608750 59 22 PLANE 47.34500 AIR 23 93.2200 7.00000 1.603500 64 GROUP 24 -135.8300 4 0.50000 AIR 25 -114.6300 - 3.00000 1.613099 44.4 26 242.800 121.53047 AIR. ______________________________________

Claim 3

Dependent Claim 99 words

An optical system for the production of special effects on an unexposed film, constituting an optical printer or caption stand and comprising at least one objective associated with means for projecting at least one exposed film on the unexposed film in order to obtain special effects, wherein at least one of the objectives is constituted by four groups of lenses, viz: a first convergent group of four lenses, a second divergent group of four lenses, a third convergent group of six lenses, a fourth convergent group of two lenses, the first and third groups being coupled together and movable.

Claim 4

Dependent Claim 99 words

An optical system for the production of special effects on an unexposed film, constituting an optical printer or caption stand and comprising at least one objective associated with means for projecting at least one exposed film on the unexposed film in order to obtain special effects, wherein at least one of the objectives is constituted by four groups of lenses, viz: a first convergent group of four lenses, a second divergent group of four lenses, a third convergent group of six lenses, a fourth convergent group of two lenses, the first and third groups being coupled together and movable.

Claim 5

Dependent Claim 129 words

An optical system according to claim 2, wherein said variable-focal-length objective is pivotally mounted on an axis located at the midpoint between the object plane and the image plane and parallel to said planes so as to be capable of taking up two symmetrical positions with respect to said axis by reversal of said objective, and wherein: when the objective is located between the axis aforesaid and the object, the magnification corresponding to the limits of displacement in translational motion of the first and third groups varies substantially between 1 and 4, and when the objective is placed in its second position after reversal about the axis from the previous position, the reduction obtained by translational motion of the first and third groups varies substantially between 1 and 0.25.

Claim 6

Dependent Claim 69 words

An optical system according to claim 3 in which the general optical axis is horizontal, wherein said system comprises means for producing a pivotal displacement of the variable-focal-length objective about a horizontal axis at right angles to the optical axis of the system in order to cause said system to take up successively two symmetrical positions with respect to said axis after reversal through an angle of 180 degrees.

Claim 7

Dependent Claim 52 words

An optical system according to claim 4, wherein the means for producing a pivotal displacement of the objective about the axis aforesaid comprise a vertical shoe mounted on a support block and rotatable about said axis, stops for adjusting the positions of the objective being placed on each side of said shoe.

Claim 8

Dependent Claim 137 words

An optical system according to claim 3, constituted by a caption stand comprising a projector having a horizontal optical axis which is capable of unwinding a first film, a mirror for reflecting the luminous flux to a condenser which is intended to receive a document, an unexposed film unwound by a camera located above the condenser and carried by a supporting element in such a manner as to ensure that the optical axis of said element and of the camera is vertical, and two variable-focal-length objectives, one objective being mounted between the projector and the reflector for pivotal displacement about a vertical axis at right angles to the horizontal optical axis, the other objective being placed between the condenser and the camera for pivotal displacement about a horizontal axis at right angles to the vertical optical axis.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1985-06-28	1985-12-28	1986-06-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1989-06-28	1989-12-28	1990-06-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1993-06-28	1993-12-28	1994-06-29	$7700.00	Window Closed / Lapsed

Variable-focal-length objective and an optical system equipped with objectives of this type for the production of special effects on film

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