10 results about "Cylindrical power" patented technology

The system includes a series of contact lenses having at least one cylindrical power across a plurality of spherical powers, each lens having a stabilization region positioned on the front surface outside the viewing region. For each cylindrical power within the series there is a set of lenses comprising: a first lens having only a spherical power in the central optical region and having a first maximum thickness of a stable region, and a second lens having a second maximum thickness of a stable region; the first maximum thickness is designed such that a first population with a first eyelid pressure provides a predetermined angular recovery response and rotational stability on the eyes; and the second lens has first spherical focal power and second spherical focal power so as to correct presbyopia. The second lens has a maximum thickness greater than the first thickness, the maximum thickness being designed such that a second population having an eyelid pressure less than or equal to 70% of the first eyelid pressure provides an angular recovery response and rotational stability at least as good as the predetermined angular recovery response and rotational stability of the first lens.

1. Name of the product in this design: Intelligent Surface Measuring Instrument. 2. Purpose of this design: To measure and test the optical properties of lenses, such as spherical power, cylindrical power, and prism power. 3. The key design points of this product are: the shape of design 1, and the shapes, colors, and combinations of design 2 and 3. 4. The picture or photo that best illustrates the key design points: Design 1 3D diagram 1. 5. Design 1 is designated as the basic design. 6. Other situations requiring explanation: Other explanation: Designs 2 and 3 for which protection is sought include color.

The utility model relates to the technical field of mechanical manufacturing, and provides a cylinder sleeve convenient to machine, which comprises an upper cylinder barrel and a lower cylinder barrel, a horn hole is arranged at one end of the upper cylinder barrel, threads are fixedly connected to the inner surface of the horn hole, a circular truncated cone is fixedly connected to the outer surface of the lower cylinder barrel, and a spiral groove is arranged on the outer surface of the circular truncated cone. The side, close to the horn hole, of the upper cylinder barrel and the end, close to the circular truncated cone, of the lower cylinder barrel are each provided with a plurality of dovetail grooves, a pair of dovetail grooves in the same horizontal direction are formed in the outer surfaces of the upper cylinder barrel and the lower cylinder barrel, and dovetail pins are movably embedded in the multiple pairs of dovetail grooves correspondingly to divide the long cylinder sleeve into the upper cylinder barrel and the lower cylinder barrel. And then the upper cylinder barrel and the lower cylinder barrel form a longer cylinder sleeve through threaded connection and tenon-and-mortise connection of the dovetail pin, so that the longer cylinder sleeve can be conveniently machined, precision indexes such as cylindricity, roundness and straightness of the whole cylinder sleeve are ensured, the machining precision is ensured, and the machining difficulty is reduced.

The application discloses a pointing mirror assembly and a bonding tool thereof, and relates to the technical field of space laser communication. The pointing mirror adopts a back convex cylindrical structure form, improves the rigidity of the bonding part of the mirror body, improves the anti-deformation capability, and provides sufficient operation space for the tool at the back. The flexible joint is locally bonded with the mirror body, and a force releasing lever is formed from the bonding point to the inner flexible groove root, so that the shrinkage deformation of the glue layer is released, the bonding stress is reduced, and the bonding stress caused by the continuous bonding of the whole circumference of the outer cylindrical surface is avoided. In addition, the circumferential material of the bonding point is continuous, the bonding surface cylindricity and local rigidity are easy to control, the uniformity of the glue layer is easy to guarantee, and the pointing mirror position stability under vibration is stable. The external interfaces are far away from each other, and the unevenness influence is weakened. By selecting appropriate bonding layer thickness adhesive and using the tool plug, the two bonding parts do not need to be precisely machined and matched. After bonding, the assembly precision and consistency are high, the subsequent whole machine adjustment is facilitated, and the space environment working condition requirements are met.

The invention discloses a near glasses fitting method for myopia prevention and control, and belongs to the field of myopia prevention and control. The problems that read-write glasses obtained according to an existing fitting method are poor in applicability and poor in myopia prevention and control effect are solved. According to the technical scheme, the method comprises the following steps that the accurate diopter of a detected person is obtained through objective optometry and subjective optometry, the initial spherical power is S, the cylindrical power is C, the additional spherical power S1 = 1 / f-1 / F on the basis of the distant optometry is calculated according to the actual habitual eye using distance f and the simulated eye using distance F of a patient, and the additional spherical power S1 = 1 / f-1 / F is calculated according to the actual habitual eye using distance f and the simulated eye using distance F of the patient; calculating the total spherical power SP = S + S1 to obtain the actual gradient AC / A = Y2-Y1 when the positive spherical lens is added to the detected person, further obtaining the additional value P1 = S1 * AC / A of the first prism, calculating the additional value P2 = (2 * BI blurring point-BO blurring point) / 3 of the second prism, and comparing the additional value of the first prism with the additional value of the second prism to obtain the final prism addition degree and the final spherical power; the invention is applied to the visual light industry.

The system includes a series of contact lenses having at least one cylindrical power across a plurality of spherical powers, each lens having a stabilization region positioned on the front surface outside the viewing region. For each cylindrical power within the series there is a set of lenses comprising: a first lens having only a spherical power in the central optical region and having a first maximum thickness of a stable region, and a second lens having a second maximum thickness of a stable region; the first maximum thickness is designed such that a first population with a first eyelid pressure provides a predetermined angular recovery response and rotational stability on the eyes; and the second lens has first spherical focal power and second spherical focal power so as to correct presbyopia. The second lens has a maximum thickness greater than the first thickness, the maximum thickness being designed such that a second population having an eyelid pressure less than or equal to 70% of the first eyelid pressure provides an angular recovery response and rotational stability at least as good as the predetermined angular recovery response and rotational stability of the first lens.

The invention relates to an ophthalmic lens (10) having a rotating point and a vertical line (VL) passing through said rotating point, and providing at a far vision point (FVP) at least a non-zero cylindrical power oriented according to a nominal cylinder axis relative to said vertical line and in a near vision area (11) a non-zero addition of spherical power. According to the invention, said ophthalmic lens is suitable for a range of prescriptions of cylinder axis of at least 20° about said nominal cylinder axis.

The system comprises three optical elements arranged along an optical axis, each optical element having a different cylindrical axis and a variable cylindrical power. The three elements together form a composite optical element having an overall spherical power (SPH), a cylindrical power (CYL) and a cylindrical axis (Axis) which can be varied according to a prescription (Rx).

A tool for detecting the shape and position tolerance of the outer contour of a small thin-walled cylindrical shell, using an axial positioning method to detect the shell's straightness, circular runout, coaxiality and end face verticality. The workpiece is mounted on the first positioning conical shaft and the second positioning conical shaft of the detection tool and axially clamped. Two cones are used to match the apertures at both ends of the cylindrical workpiece, respectively, and the workpiece axis automatically coincides with the connecting center line of the two cones, so that the measurement reference and the design positioning reference coincide. The right end cone is pushed to clamp the workpiece by the pressure of the spring, and the workpiece rotates freely under the clamping state. The measuring table frame is installed on the slider seat of the high-precision rolling linear guide pair, and the linear movement of the measuring table frame can be realized. The present invention can measure the runout of any position of the outer contour feature of the cylindrical shell, thereby reflecting the shape and position tolerances of the workpiece measurement part, such as coaxiality, roundness, cylindricity, verticality, flatness, straightness, etc. The operation process is convenient and suitable for batch detection at the production site.

The invention discloses a pointing mirror assembly and a bonding tool thereof, and relates to the technical field of space laser communication. The pointing mirror adopts a cylindrical structure with a convex back, so that the rigidity of the mirror body at the bonding part is improved, the deformation resistance is improved, and meanwhile, a sufficient operation space is provided for the back to adapt to a tool. The flexible joint is locally bonded with the mirror body, and a force unloading lever is formed from the bonding point to the root of the flexible groove on the inner side, so that curing shrinkage deformation of the adhesive layer is released, the bonding stress is reduced, and the situation that the bonding stress is nowhere to be released due to full-circumference continuous bonding of the outer cylindrical surface is avoided. In addition, circumferential materials of bonding points are continuous, cylindricity and local rigidity of a bonding surface are easy to control, and uniformity of an adhesive layer and stability of location degree of the pointing mirror under vibration are guaranteed. External interfaces are far away from each other, so that the unevenness influence is weakened. And an adhesive with a proper adhesive layer thickness is selected, and a tool plug block is utilized, so that two adhesive pieces do not need to be subjected to finish turning assembly. And the precision and the consistency of the bonded assembly are high, subsequent whole machine assembling and adjusting are facilitated, and meanwhile the space environment working condition requirements are met.