413 results about "Conditional expression" patented technology

The invention discloses a human resource data natural language query and SQL generation method and system, and relates to the technical field of SQL generation, and the method comprises the steps: preprocessing a natural language query text input by a user, and constructing a query semantic tree; traversing the query semantic tree to generate a candidate entity set, determining an unambiguous entity through a three-layer ambiguity resolution mechanism of semantic scoring, service verification and cross validation, identifying a composite intention, disassembling the composite intention into a sub-intention sequence, and generating an SQL operation instruction set in combination with a preset SQL operation mapping rule; based on the SQL operation instruction set and the human resource data association model, determining a data table set and an association path, generating a dynamic calculation logic and structured condition expression, and constructing a structured query skeleton; according to the method, the personalized SQL template is dynamically generated according to the query skeleton, after filling, grammar verification, strategy optimization and logic consistency verification are performed, and the optimized SQL statement is output, so that the query accuracy and performance are remarkably improved.

The present application relates to the technical field of electric digital data processing, and provides a data preparation method, system, and device for AIGC-based interaction analysis, and a medium. The method comprises: by means of a pre-trained text label recognition model, determining a label sequence corresponding to an interaction statement having experienced first word segmentation processing; on the basis of a preset expression construction rule, determining a label combination sequence corresponding to the label sequence and a conditional expression corresponding to the label combination sequence; by means of a preconfigured database candidate text dictionary and a preset matching rule, determining a strictly matched keyword and a fuzzily matched keyword corresponding to the interaction statement having experienced second word segmentation processing; on the basis of the strictly matched keyword and a similar candidate text corresponding to the fuzzily matched keyword, determining a word segmentation result corresponding to the second word segmentation processing; on the basis of a plurality of preset SQL statement rule matching templates, generating an interaction SQL query statement, so as to determine, on the basis of the interaction SQL query statement, interaction response information corresponding to the interaction statement.

The invention discloses a complex SQL query dynamic rewriting method based on AST and a server, and relates to the field of data rewrite.The method comprises the steps that in response to a received target database type, an original SQL query statement is analyzed into AST; an SQL processor is initialized; recursively traversing a selection statement structure of the main query, and recursively traversing a sub-query structure nested in the selection statement structure; recursively traversing each selected statement structure in the joint query; recursively traversing conditional expressions in the updated statements, the deleted statements and the inserted statements or nesting and selecting statement structures; converting the rewritten AST into an SQL (Structured Query Language) query statement after dynamic rewriting; and returning the dynamically rewritten SQL query statement, and rewriting the SQL expression and the SQL statement structure in the AST according to a preset dynamic modification logic. The technical problem that a complex nested structure cannot be processed in a traditional SQL enhancement or modification mode can be effectively solved.

The zoom lens consists of, in order from the object side, a first lens group that has a negative refractive power; a second lens group that has a positive refractive power; a third lens group that has a negative refractive power; and a fourth lens group that has a positive refractive power. During zooming, in each lens group, distances between the adjacent groups in the direction of the optical axis are changed. The first lens group consists of, in order from the object side, a first lens having a negative refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power. The third lens group consists of a negative lens. During focusing, only the third lens group moves along the optical axis. The zoom lens satisfies predetermined conditional expressions.

The invention discloses a compact internal focusing wide-angle photographic lens and a photographic device. The lens sequentially comprises a first lens group with positive focal power, an aperture diaphragm, a second lens group with positive focal power and a third lens group with negative focal power from an object side to an image side, in the focusing process, the second lens group moves along the optical axis, and the first lens group and the third lens group remain unchanged relative to the position of the image plane. The first lens group, the second lens group and the third lens group satisfy the following conditional expressions: 1.5 < = F1 / F < = 3.5; 1 < = F2 / F < = 2; -3 < = F3 / F < =-1; wherein F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the focal length of the photographic lens. The compact internal focusing type wide-angle photographic lens provided by the technical scheme of the invention is beneficial to optimizing the optical performance of the lens, simplifying the focusing mechanism and simplifying the design and manufacturing.

The invention discloses a large-aperture internal focusing type standard photographic lens and a photographic device. The lens sequentially comprises a first lens group with positive focal power, an aperture diaphragm, a second lens group with positive focal power and a third lens group with negative focal power from an object side to an image side, in the focusing process, the second lens group moves along the optical axis, and the first lens group and the third lens group remain unchanged relative to the position of the image plane. The first lens group, the second lens group and the third lens group satisfy the following conditional expressions: 1 < = F1 / F < = 3; 0.5 < = F2 / F < = 1.5; -5 < = F3 / F < =-3; wherein F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the focal length of the photographic lens. The large-aperture internal focusing type standard photographic lens provided by the technical scheme of the invention is beneficial to optimization of optical performance, focusing mechanism, balance of positive and negative focal power and simplification of design and manufacturing of the lens.

The illumination optical system is disposed at a distal end of a light guide of an endoscope. A first surface that is a surface of the illumination optical system closest to a light guide side includes a plurality of ring-shaped groove portions that are arranged in a concentric circular shape about an optical axis of the illumination optical system. The groove portions have an inclined surface that narrows a groove width from the light guide side toward an irradiation target side. In the first surface, all surfaces that are perpendicular to the optical axis and adjacent to the inclined surfaces of the groove portions are light diffusion surfaces. The light diffusion surfaces include first light diffusion surfaces that are present between the groove portions adjacent to each other. The illumination optical system satisfies a predetermined conditional expression.

An imaging optical system (100) includes, in order from an object side to an image side, a front group (110), an aperture (130), and a rear group (120). The front group (110) is configured from a plurality of lenses including the first lens (10) disposed closest to the object side. The rear group (120) is configured from a plurality of lenses. The first lens (10) has a negative refractive power. When the total length of the entire lens system is d0, the effective radius of the object-side lens surface (11) of the first lens (10) is sd11, and the maximum image height is IH, the following conditional expressions are satisfied: 3.000 < d0 / sd11 < 4.500 (1); and (2) d0 / IH is greater than 2.500 and less than 5.000.

An imaging optical system includes, in order from an object side to an image side, a first lens group, a second lens group, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power, in which, when focusing from an infinite distance object to a close distance object, the first lens group remains stationary with respect to an image surface, the second lens group moves to the object side along an optical axis, the third lens group remains stationary with respect to the image surface, the fourth lens group moves to the object side along the optical axis, and the fifth lens group remains stationary with respect to the image surface, the imaging optical system includes an aperture diaphragm, and the imaging optical system satisfies a predetermined conditional expression.

The invention discloses an optical lens, which is characterized by sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis, the second lens has negative focal power; the third lens has negative focal power; the fourth lens has positive focal power; the fifth lens has positive focal power; the sixth lens has negative focal power; the seventh lens has positive focal power; the eighth lens has positive or negative focal power; a ninth lens having negative or positive focal power; the tenth lens has negative focal power; the eleventh lens has positive focal power; the twelfth lens has negative focal power; the thirteenth lens has negative or positive focal power; the number of lenses with focal power in the optical lens is thirteen. The optical lens satisfies the following conditional expressions: 3.497 < = F89 / F < = 6.061; wherein F89 is the combined effective focal length value of the eighth lens and the ninth lens, and F is the total effective focal length value of the optical lens.

The invention discloses a compact internal focusing type standard photographic lens and a photographic device. The lens sequentially comprises a first lens group with positive focal power, an aperture diaphragm, a second lens group with positive focal power and a third lens group with negative focal power from an object side to an image side, in the focusing process, the second lens group moves along the optical axis, and the first lens group and the third lens group remain unchanged relative to the position of the image plane. The first lens group, the second lens group and the third lens group satisfy the following conditional expressions: 2 < = F1 / F < = 4; 0.7 < = F2 / F < = 2; -4 < = F3 / F < =-2; wherein F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the focal length of the photographic lens. The compact internal focusing type standard photographic lens provided by the technical scheme of the invention is beneficial to optimization of optical performance, focusing mechanism, positive and negative focal power balance and simplification of design and manufacturing of the lens.

The utility model discloses a visual system. The visual system comprises a first lens cone and a second lens cone which are sequentially arranged from a first side to a second side along an optical axis, and a first lens group and a second lens group which are respectively supported on the two lens cones, the first lens group sequentially comprises a first lens, a reflective polarizing element and a quarter-wave plate, and the second lens group sequentially comprises a second lens, a partial reflection element and a third lens; the focal power of the first lens and the second lens is positive, the surface types of the first lens and the third lens are convex and concave-convex respectively, and the second side surface of the second lens is a convex surface; the second lens and the third lens are glued; the second lens group can move along the optical axis to be close to or far away from the display on the second side, so that the system is switched between the first state and the second state; the visual system satisfies the following conditional expressions: 0.33 < = (fz / f23) * (La / Lb) < = 1.10 and 0.75 mmlt; (dbs / dam) * [delta] flt; and the thickness is 1.95 mm.

An optical system comprises a first lens group having positive refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power, arranged in order from an object side. When focusing, the second lens group moves along an optical axis. The optical system satisfies the following conditional expression0.30<{1−(β2)2}×(β3)2<2.00where β2 is a lateral magnification of the second lens group for a state of focusing on infinity, andβ3 is a lateral magnification of the third lens group.

The invention provides an imaging optical system suitable for a large aperture ratio telephoto lens which is light in weight and in which chromatic aberration on the axis is well corrected. This imaging optical system is configured from a first lens group (G1), a second lens group (G2), and a third lens group (G3), which are arranged in this order from the object side and have positive refractive power, only the second lens group (G2) moves when focusing from an object at infinity to an object at a close distance, the first lens group (G1) is configured from a group 1a and a group 1b arranged in this order from the object side, and the third lens group (G3) is configured from a group 1b and a group 1b arranged in this order from the object side. The 1b group has a meniscus-shaped negative lens (L1na) having a convex surface facing the object side and a negative lens (L1nb) different from the negative lens (L1na), the negative lens (L1na) being a negative lens located closest to the object side in the first lens group (G1), and the imaging optical system satisfies a predetermined conditional expression.

The imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, in which the second lens has a positive refractive power and is made of a glass material, and the fifth lens is made of a plastic material, the imaging lens system satisfies a conditional expression f number lt; the f number is the f number of the imaging lens system.

A phase difference sheet including a substrate and a phase difference film as a tilt film, wherein, in a biaxial refractive index ellipsoid exhibiting a refractive index anisotropy, of three principal refractive indexes nx, ny, nz, the principal refractive index in the length direction of a columnar structure, i.e., the X-axis direction, is nx, the principal refractive index in the major axis direction of an ellipse perpendicular to the X-axis, i.e., the Y-axis direction, is ny, and the principal refractive index in the minor axis direction, i.e., the Z-axis direction, is nz, the following conditional expression (1) is satisfied, and, in a case where the incident angle of a direction tilted to the X-axis side with the normal as a reference is positive, the phase difference of incident light at an incident angle of +30° is Re(+30), the phase difference of incident light at an incident angle of -30° is Re(-30), and the ratio of Re(+30) to Re(-30), i.e., the phase difference ratio, is Re(30) ratio, the following conditional expression (2) is satisfied, ny > nx > nz (1), Re(30) ratio = Re(30) / Re(-30) = 1.1 to 4.0 (2).

The variable magnification optical system (ZL) has a plurality of lens groups including a first lens group (G1) disposed closest to the object side and having a positive refractive power and a final lens group (GL) disposed closest to the image surface side and having a negative refractive power, the plurality of lens groups having at least six lens groups, and when changing magnification, the first lens group (G1) and the final lens group (GL) each have a positive refractive power and a negative refractive power. The variable magnification optical system (ZL) satisfies the following conditional expression: 2.00 < f1 / (-fL) < 20.00, where f1 is the focal length of the first lens group (G1), and fL is the focal length of the final lens group (GL).

An electronic device is provided. The electronic device includes a first imaging optical system including a first image sensor, and a second imaging optical system including a second image sensor, a reflective member, a first lens group, a second lens group, and a third lens group, the first, second, and third lens groups being sequentially arranged from the reflective member to the second image sensor, the second and third lens groups being configured to slide with respect to the first lens group, and the first and second imaging optical systems being configured to satisfy a conditional expression SSW / SST>2, where SSW denotes a size of the first image sensor and SST denotes a size of the second image sensor.

An observation optical system includes a display element and an eyepiece lens disposed on an eyepoint side of the display element. The eyepiece lens includes a first lens having positive optical power, a second lens having negative optical power, and a third lens consecutively in order from closest to a display element side to the eyepoint side. In a case where a half value of a longest diameter of a display region in the display element is denoted by H, and a focal length of the eyepiece lens in a state where diopter is −1 diopter is denoted by f, the observation optical system satisfies a conditional expression represented by 0.35<H / f<0.6.

The invention provides an imaging lens which is small in size and maintains good optical performance and an imaging device provided with the imaging lens. The imaging lens includes, in order from an object side to an image side, a first lens group, an aperture, and a second lens group. The second lens group includes two or more lenses satisfying the following conditional expression, where f is the focal length of the imaging lens in a state in which the imaging lens is focused on an infinite object, and Rf is the radius of curvature of the object-side surface of the lens included in the imaging lens. -15 < f / Rf <-0.5

The utility model relates to an optical imaging system. The optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side, in which a conditional expression TTL / (2 * IMG HT) < = 0.57 is satisfied, where TTL is a distance from an object side surface of the first lens to an image plane along an optical axis, and IMG HT is half a diagonal length of the image plane.

The imaging lens includes, in order from an object side to an image side, a first lens group, a second lens group, and a third lens group having positive refractive power. During focusing, the interval between the first lens group and the second lens group changes, and the interval between the second lens group and the third lens group changes. The imaging lens satisfies a preset conditional expression.

The imaging lens includes, in order from an object side, a first lens group that has a refractive power, a second lens group that has a positive refractive power, and a third lens group that has a negative refractive power. During focusing, the second lens group moves. The second lens group includes a stop and at least three negative lenses. The imaging lens satisfies predetermined conditional expressions.

This zoom optical system (ZL(1)) has a plurality of lens groups (G1-G7), wherein when during zooming, distances between adjacent lens groups vary. The plurality of lens groups include: a first focused lens group (G6) that moves during focusing; and a second focused lens group (G7) that is disposed closer to an image plane side than the first focused lens group and moves during focusing along a trajectory that is different from that of the first focused lens group. The first focused lens group (G6) and the second focused lens group (G7) both have a negative refractive power and satisfy the following conditional expression, 0.40<fF1 / fF2<6.00, where fF1: focal length of first focused lens group and fF2: focal length of second focused lens group.

An optical lens assembly includes a first lens to a sixth lens in sequence along an optical axis from a light output side to a light input side. An optical axis region and a periphery region of a light input surface of the sixth lens are concave and convex surfaces, respectively. A periphery region of a light output surface of the sixth lens is a concave surface. The optical lens assembly satisfies conditional expressions of EDmax / EDmin≦2.100 and 3.000≦(D21t32+G56) / D11t21. EDmax and EDmin are maximum and minimum values of effective diameters. D21t32 is a distance from a light output surface of the second lens to a light input surface of the third lens. G56 is an air gap between the fifth and sixth lenses on the optical axis. D11t21 is a distance from a light output surface of the first lens to the light output surface of the second lens.

A zoom lens according to the present disclosure comprises: a first lens group having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power. The third lens group has a first lens unit configured as a vibration-proof lens unit that moves an image formation position in a direction perpendicular to an optical axis by moving in a direction perpendicular to the optical axis, a second lens unit disposed further toward the image surface side than the vibration-proof lens unit, and an aperture stop disposed further toward the image surface side than the vibration-proof lens unit, and satisfies conditional expression (1). fL3a is the focal length of the vibration-proof lens unit, and fL3b is the focal length of the second lens unit.　(1): 0.0 < |fL3a / fL3b| < 1.5

An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially disposed in ascending numerical order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, wherein the second lens has a positive refractive power, the third lens has a convex image-side surface in a paraxial region thereof, and the imaging lens system satisfies the conditional expression 0.3<f / f4<0.4, where f is a focal length of the imaging lens system, and f4 is a focal length of the fourth lens.

A zoom lens consists of, in order from the object side, a first lens group that has a positive refractive power, a middle group that includes a plurality of lens groups in which the spacings between adjacent lens groups change during zooming, and the final lens group. The focusing group that moves during focusing is disposed in the middle group. The zoom lens satisfies predetermined conditional expressions.

The invention provides a variable magnification optical system and an imaging apparatus. A variable magnification optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a negative refractive power arranged in order from an object side, the variable magnification optical system being characterized in that the interval between the first lens group and the second lens group changes when magnification is varied, and the interval between the fourth lens group and the fifth lens group changes when magnification is varied. The variable magnification optical system satisfies a specific conditional expression in which an interval between the second lens group and the third lens group varies, an interval between the third lens group and the fourth lens group varies, and when focusing from an infinite end to a very near end, any one of the fourth lens group and the fifth lens group moves along an optical axis.

The application discloses a high-illumination projection assembly and a welcome lamp, which comprise an illumination lens group, an imaging lens group and a shell assembly; the imaging lens group comprises, in sequence from the image side to the object side, a first lens with positive refractive power, a second lens with negative refractive power and a third lens with positive refractive power; the imaging lens group has three lenses with refractive power; the illumination lens group comprises, in sequence from the image side to the object side, a fourth lens with positive refractive power and a fifth lens with positive refractive power; the imaging lens group satisfies the following conditional expression: 54.115mm < f123 / tan (Semi-Fov1) < 134.382mm; the imaging range of the imaging lens group can be wide, the pattern projected by the projection assembly has higher recognition and the imaging is clearer.