Abstract: A multifocal diffractive lens is provided which achieves efficient use of light. The multifocal diffractive lens 100 includes a diffraction grating 1c. Negative-order light L2 produces a focal point f2 for far vision and 0-order light L1 produces a focal point f1 nearer to that for far vision. The number of focal points is two or more. The focal position fc for far vision in polychromatic performance evaluation is located nearer to the multifocal diffractive lens than the focal position fs for far vision in monochromatic performance evaluation.

Abstract: There is provided a toric intraocular lens which improves the visibility of a toric axis. The toric intraocular lens is a toric intraocular lens including a lens body provided with an astigmatic axis. A mark indicating the astigmatic axis is formed at an optical surface of an outer rim portion of the lens body, and a length in a radial direction of the lens body and a length in a circumferential direction of the lens body of external dimensions of the mark are different from each other in top view of the optical surface.

Abstract: An ophthalmic lens has a cross-sectional shape in an arbitrary meridian direction on a lens surface of the ophthalmic lens. The cross-sectional shape is expressed by the following formula (1), Z = c ? r 2 1 + [ 1 - c 2 ? r 2 ? ( k + 1 ) ] 1 / 2 + A ? ( ? ) ? r 2 + B ? ( ? ) ? r 4 . In the formula, c is a paraxial curvature of the ophthalmic lens, r is a distance from a lens center of the ophthalmic lens, k is a conic constant of a surface which is in rotation symmetry with respect to an optical axis of the lens in the ophthalmic lens. The variables c, r and k are used in common in the meridian direction on the lens surface, and A(?) and B(?) are parameters expressed by functions depending on an angle in the meridian direction.

Abstract: To realize a toric ophthalmic lens including an edge that makes it possible to design a lens contributing to secondary cataract prevention without deteriorating a degree of freedom of lens design. The toric ophthalmic lens is a toric ophthalmic lens in which, in a top view of an optical portion, a substantially flat portion having a substantially fixed edge thickness of the optical portion is provided to overlap a steep meridian of a toric surface of the optical portion.

Abstract: An ophthalmic lens has a cross-sectional shape in an arbitrary meridian direction on a lens surface of the ophthalmic lens. The cross-sectional shape is expressed by the following formula (1), Z = c ? r 2 1 + [ 1 - c 2 ? r 2 ? ( k + 1 ) ] 1 / 2 + A ? ( ? ) ? r 2 + B ? ( ? ) ? r 4 . In the formula, c is a paraxial curvature of the ophthalmic lens, r is a distance from a lens center of the ophthalmic lens, k is a conic constant of a surface which is in rotation symmetry with respect to an optical axis of the lens in the ophthalmic lens. The variables c, r and k are used in common in the meridian direction on the lens surface, and A(?) and B(?) are parameters expressed by functions depending on an angle in the meridian direction.

Abstract: A toric intraocular lens includes a lens body, support portions, and connecting portions for connecting the lens body and the support portions. The lens is housed in an insertion apparatus that includes a tubular apparatus body having an insertion tube for the lens and a plunger for moving the lens. Each of the connecting portions is arranged at a position where the connecting portions face each other across a center of an optical axis of the lens body. One end of the flat meridian of the lens body is located at a position opposite to a position, with respect to an axis that passes through the center and connects the connecting portions, at which the plunger contacts the lens body. An angle between the flat meridian and an axis along which the lens is pushed by the plunger is larger than 0° and equal to or smaller than 90°.

Abstract: A tonic ophthalmic lens is described in which refractivity of the lens differs between a first direction on a plane perpendicular to an optical axis of the lens and a second direction which differs from the first direction on the plane. In addition, refractivity difference which is the difference between the refractivity in the first direction and the refractivity in the second direction varies depending on a position of the lens in a radial direction.

Abstract: An intraocular lens whose application range is wider than that of the conventional single intraocular lens from the viewpoint of the characteristics at the time of bending of the support portion is made. An intraocular lens includes an optical portion having a predetermined refractive power; and a support portion configured to maintain a position of the optical portion in an eye. The support portion includes a main body formed of a flexible material and a shaft portion formed of an elastic material. At least a portion of the shaft portion is covered by the main body. An end of the shaft portion is provided away from the optical portion.

Abstract: To realize a toric ophthalmic lens including an edge that makes it possible to design a lens contributing to secondary cataract prevention without deteriorating a degree of freedom of lens design. The toric ophthalmic lens is a toric ophthalmic lens in which, in a top view of an optical portion, a substantially flat portion having a substantially fixed edge thickness of the optical portion is provided to overlap a steep meridian of a toric surface of the optical portion.

Abstract: There is provided a toric intraocular lens which improves the visibility of a toric axis. The toric intraocular lens is a toric intraocular lens including a lens body provided with an astigmatic axis. A mark indicating the astigmatic axis is formed at an optical surface of an outer rim portion of the lens body, and a length in a radial direction of the lens body and a length in a circumferential direction of the lens body of external dimensions of the mark are different from each other in top view of the optical surface.

Abstract: A toric intraocular lens includes a lens body, support portions, and connecting portions for connecting the lens body and the support portions. The lens is housed in an insertion apparatus that includes a tubular apparatus body having an insertion tube for the lens and a plunger for moving the lens. Each of the connecting portions is arranged at a position where the connecting portions face each other across a center of an optical axis of the lens body. One end of the flat meridian of the lens body is located at a position opposite to a position, with respect to an axis that passes through the center and connects the connecting portions, at which the plunger contacts the lens body. An angle between the flat meridian and an axis along which the lens is pushed by the plunger is larger than 0° and equal to or smaller than 90°.

Abstract: In an autoclave in a high pressure acid leaching process in which starting material slurry and sulfuric acid are stirred by stirring machines in each compartment in the autoclave partitioned by partition walls to proceed leaching, and slurry is transferred from a compartment on an upstream side to a compartment on a downstream side to sequentially proceed leaching, wherein starting material slurry supply tubes having the starting material slurry discharge ports and sulfuric acid supply tubes having sulfuric acid discharge ports are alternately disposed on a perimeter of stirring blades of the stirring machine provided in the compartment at an upstream end, and the starting material slurry and sulfuric acid are added to the compartment at the upstream end from the starting material slurry discharge ports and the sulfuric acid discharge ports positioned higher than an uppermost part of the stirring blades and lower than a contained liquid surface.

Abstract: In an autoclave apparatus for a high-pressure acid leaching process which advances leaching by stirring heated and pressurized material slurry and sulfuric acid by stirrers in compartments in an autoclave main body of a plurality of compartments, transfers slurry from an upstream side compartment to a downstream one to advance leaching, liquid flow ports for slurry transfer that open and close by doors are provided on the partition walls, the liquid flow ports for slurry transfer are installed at positions where the heights from the lowermost portion the autoclave to the center of gravity are 0.1 to 0.3 times an autoclave diameter and distances from the center lines of the partition walls to the center of gravity are 0.05 to 0.25 times the autoclave diameter, and the liquid flow ports for slurry transfer have shapes which do not reach end portions of the partition walls.

Abstract: It is provided with an ophthalmic lens having a cross-sectional shape in an arbitrary meridian direction on a lens surface of the ophthalmic lens. The cross-sectional shape is expressed by the following formula (1), Z = cr 2 1 + [ 1 - c 2 ? r 2 ? ( k + 1 ) ] 1 ? / ? 2 + A ? ( ? ) ? r 2 + B ? ( ? ) ? r 4 (1) wherein c is a paraxial curvature of the ophthalmic lens, r is a distance from a lens center of the ophthalmic lens, k is a conic constant of a surface which is in rotation symmetry with respect to an optical axis of the lens in the ophthalmic lens, c, r and k are used in common in the meridian direction on the lens surface, and A(?) and B(?) are parameters expressed by functions depending on an angle in the meridian direction.

Abstract: A tonic ophthalmic lens is described in which refractivity of the lens differs between a first direction on a plane perpendicular to an optical axis of the lens and a second direction which differs from the first direction on the plane. In addition, refractivity difference which is the difference between the refractivity in the first direction and the refractivity in the second direction varies depending on a position of the lens in a radial direction.

Abstract: Provided is a technique which, in the design of intraocular lenses, simplifies design work and makes it possible for aberration of the entire eyeball to more precisely match a target value when the designed intraocular lens is inserted into a patient's eye. This intraocular lens design method involves deriving an intraocular lens aberration target value from the aberration of the cornea and anterior chamber and a set value of the total eyeball aberration (S102), and determining an intraocular lens shape such that the at least the aberration of the intraocular lens coincides with the target value (S103-S107). The intraocular lens aberration is set to an intraocular lens aberration for which prescribed convergent light is incident to the intraocular lens (S104).

Abstract: In an autoclave apparatus for a high-pressure acid leaching process which advances leaching by stirring heated and pressurized material slurry and sulfuric acid by stirrers in compartments in an autoclave main body of a plurality of compartments, transfers slurry from an upstream side compartment to a downstream one to advance leaching, liquid flow ports for slurry transfer that open and close by doors are provided on the partition walls, the liquid flow ports for slurry transfer are installed at positions where the heights from the lowermost portion the autoclave to the center of gravity are 0.1 to 0.3 times an autoclave diameter and distances from the center lines of the partition walls to the center of gravity are 0.05 to 0.25 times the autoclave diameter, and the liquid flow ports for slurry transfer have shapes which do not reach end portions of the partition walls.

Abstract: In an autoclave in a high pressure acid leaching process in which starting material slurry and sulfuric acid are stirred by stirring machines in each compartment in the autoclave partitioned by partition walls to proceed leaching, and slurry is transferred from a compartment on an upstream side to a compartment on a downstream side to sequentially proceed leaching, wherein starting material slurry supply tubes having the starting material slurry discharge ports and sulfuric acid supply tubes having sulfuric acid discharge ports are alternately disposed on a perimeter of stirring blades of the stirring machine provided in the compartment at an upstream end, and the starting material slurry and sulfuric acid are added to the compartment at the upstream end from the starting material slurry discharge ports and the sulfuric acid discharge ports positioned higher than an uppermost part of the stirring blades and lower than a contained liquid surface.

Abstract: Provided is a technique which, in the design of intraocular lenses, simplifies design work and makes it possible for aberration of the entire eyeball to more precisely match a target value when the designed intraocular lens is inserted into a patient's eye. This intraocular lens design method involves deriving an intraocular lens aberration target value from the aberration of the cornea and anterior chamber and a set value of the total eyeball aberration (S102), and determining an intraocular lens shape such that the at least the aberration of the intraocular lens coincides with the target value (S103-S107). The intraocular lens aberration is set to an intraocular lens aberration for which prescribed convergent light is incident to the intraocular lens (S104).

Abstract: The present invention is intended to provide an aroma device that can eliminate the need for the replacement of the light source, can prevent the light source from becoming high in temperature and can allow light and aroma to be enjoyed comfortably with a sense of security for a long time. The aroma device uses, as a light source, LEDs 1 covered with first and second covers 3 and 4, and also uses a heater 5 to heat a material 10 to be heated which emits aroma; hence, the need for the replacement of the light source is eliminated, the light source is prevented from becoming high in temperature, and light and aroma can be enjoyed comfortably with a sense of security for a long time.