CN200950181Y - Molded lens with notches for decentration detection - Google Patents

Abstract

The utility model relates to a molded lens with nicks for eccentricity detection, which is characterized in that one or a plurality of nicks concentric with an optical surface are respectively arranged on the plane parts of the front and the back surfaces of the molded lens within the range of not influencing the molding of the optical surface, and the nicks can be observed by a tool microscope; by this, the eccentric value of the molded lens can be measured by the eccentric detection function of the tool microscope, and the eccentric direction can be calibrated to be used as the basis for the correction of the mold.

Description

Molded lens with notches for decentration detection

technical field

The utility model relates to a molded lens provided with a notch for eccentricity detection, and in particular to a lens with one or several lenses on the front and rear of the lens and on the plane part outside the scope of the optical surface. Concentric notches, and the above notches can be observed under a tool microscope, by using the eccentricity detection function attached to the tool microscope, the eccentricity value of the molded lens can be measured, and the eccentricity direction can be calibrated as the The basis for the correction of the lens forming mold.

Background technique

A molded lens. The molded lens A1 shown in Figure 1 generally includes the following steps: first design the front and rear optical surfaces A2 of the lens, such as designing one convex and one concave two aspherical surfaces; and then use ultra-precision machining To make a lens forming mold, such as using an ultra-precision machining machine, and using a numerical control program (NC) to set the tool path, that is, to set the sag value (cutting depth value), so that it can automatically perform precision machining of the mold , and as far as a curved lens is concerned, let the Z axis be the optical axis (Optical Axis) of the lens, and take the center of the curved surface as the zero point (the origin of the X-Y plane), and at different positions on the curved surface of the lens, the direction of the Z axis is parallel to the X-Y The height difference of the plane is the sag value, and the sag value can be calculated by using optical equations such as Anamorphic surface, First Type Toric surface or Second Type Toric surface and matching parameters; and then using the molding die for injection molding (injection molding) process or die-casting process to manufacture lenses in mass production; and after the molding mold is completed, a sample is generally made first to test whether the lens is eccentric, as a basis for mold correction; and each manufactured Generally, a lens can only be judged as a usable good product after a testing procedure.

It is also concerned with the detection of the eccentricity of the optical surface A2 of the molded lens A1. As shown in Figure 2, the existing detection technology is to use a penetrating eccentricity meter A3 and a rotatable jig A4 to make the parallel light source at the bottom The light A5 directly penetrates the optical surface A2 of the lens A1 to be tested to be imaged on the screen (display screen) A6 for detection; but the price of the penetrating eccentricity meter A3 is expensive, and the production cost is relatively increased. The fixture A4 of the lens A1 must drive the lens A1 to be tested to rotate, and use the diameter of the focal point A7 rotating on the screen (display) A6 as the basis for determining the size of the eccentricity. Therefore, the requirement for the eccentricity of the fixture A4 itself is very high. If the value is at least 2 μm (10 ^-6 m), the cost of jig A4 will be relatively increased, and the error of the clamping operation will easily affect the test results, resulting in relatively troublesome testing and control (quality control) of molded lens A1 . In the existing detection technology, only the eccentricity of the lens A1 to be tested can be determined on the screen A6, and it is impossible to determine the front and rear two different optical surfaces A2 of the lens A1 to be tested (such as a convex and a concave front and rear two non- spherical surface), so although the eccentricity of lens A1 is detected on screen A6, it is difficult to directly use it as the basis for mold correction. The error of one of the optical surfaces makes it impossible to accurately or efficiently correct the molding surface of the mold on the erroneous optical surface, which relatively causes troubles in mold correction.

Contents of the invention

The main purpose of the present utility model is to provide a molded lens provided with notches for eccentricity detection, which are respectively provided with one or Several notches concentric with the optical surface, and the said notches can be observed under the tool microscope, so that when the lens is inspected for eccentricity, the lens can be detected by using the eccentricity detection function attached to the tool microscope The eccentricity and the eccentric direction can be calibrated as the basis for the correction of the lens forming mold, so as to reduce the cost of testing equipment, simplify the testing procedure, improve the working efficiency of mold correction, and improve the control effect of the lens.

Another object of the present utility model is to provide a molded lens provided with a notch for eccentricity detection, wherein the notch is used to make the optical lens on the forming mold The surface forming surface and the notch forming surface are cut by the same cutting stroke, so as to simplify the process of making the notch on the lens, and make the notch and the optical surface form a concentric state.

Another object of the present utility model is to provide a molded lens with notches for eccentricity detection, wherein the notches are arranged at different diameters of the front and rear plane parts of the lens, so that the notches can be Observe under the tool microscope respectively, and then determine the eccentricity and eccentricity direction of the two different optical surfaces at the front and rear of the lens respectively, and simplify the correction of the mold by correcting each optical surface in the mold accurately and efficiently Operation.

Description of drawings

Fig. 1 is a schematic cross-sectional view of an existing molded lens;

Fig. 2 is a schematic diagram of an existing method for detecting eccentricity of a molded lens;

Fig. 3 is a schematic cross-sectional view of an embodiment of the utility model;

Fig. 4 is an enlarged schematic view of a concentric notch in the front plane part in Fig. 3;

Fig. 5 is an enlarged schematic view of a concentric notch in the rear plane part in Fig. 3;

Fig. 6 is a schematic diagram of the eccentric detection method of the molded lens of the present invention;

Fig. 7 is a detection schematic diagram of concentric notches observed through a tool microscope magnification of the utility model;

Fig. 8 is a schematic diagram of a forming mold for molding a lens of the present invention.

Explanation of reference signs: 1-lens; 10, 11-optical surface; 12, 13-flat surface; 14, 15-notch; 141, 151-sharp corner; 16-periphery of lens; 2-tool microscope; 20-camera 21-display screen; 22X-Y-platform; 23-backlight light source; 3-molding mold; 30, 31-molding surface; 32, 33-molding surface.

Detailed ways

Relevant utility model is to reach above-mentioned purpose, technical means and effect thereof that feature adopts, by citing preferred embodiment and coordinating drawing description as follows:

With reference to shown in Figure 3, the basic structure of the molded lens 1 of the present utility model is similar to the lens A1 shown in Figure 1 of the existing molded lens, with front and rear two different optical surfaces 10,11 (such as a convex and a concave front and rear two Aspherical surface) and front and rear two plane parts 12, 13, and it is characterized in that: on the front and rear plane parts 12, 13 of the molded lens 1, and within the range that does not affect the molding of the optical surfaces 10, 11, respectively set One or several notches 14,15 concentric with the optical surface, as shown in Figure 3, are respectively provided with a notch 14,15 concentric with the optical surfaces 10,11 on the front and rear two plane parts 12,13, And the notches 14, 15 can be enlarged and observed as shown in FIG. 7 through the display screen 21 of the camera 20 shown in FIG. The eccentricity detection function included in the tool microscope 2 can measure the eccentricity value of the lens 1, and can calibrate the eccentricity direction as the basis for the correction of the lens forming mold.

As shown in Figure 8 again, the notches 14, 15 are made when the forming mold 3 of the lens 1 is made, so that the optical surfaces 30, 31 corresponding to the optical surfaces 10, 11 of the lens on the forming mold 3 and corresponding to the engraved The nicks 32, 33 of the nicks 14, 15 are processed by the cutting tool of the ultra-precision machining machine at the same time, that is, the same cutting stroke is used to complete the processing, so as to ensure that the nicks 14, 15 on the lens 1 and the optical surface 10, 11 is concentric state.

Referring again to Figures 6 and 7, when utilizing the tool microscope 2 to measure the eccentricity of the eyeglass 1, the eyeglass 1 to be tested is placed on the X-Y platform 22, and a backlight light source 23 is provided below the eyeglass 1 to be tested, so that the camera 20 can pass through. The magnified images of the notches 14, 15 and the lens periphery 16 observed on the display screen 21 of the lens are shown in FIG. When the tool microscope 2 picks the graphical object, as shown in Figure 7, it can obtain information such as the coordinates and true roundness of the optical surfaces 10 and 11 of the lens 1 to be tested, wherein the coordinates can be used to calculate the amount of eccentricity and the direction of eccentricity (position), the true roundness can be used to determine the error of manual operation, if the true roundness is too large, it means that the manually selected position is not accurate, or the object is placed unevenly, or the object shrinks too much, and the eccentric direction can be calibrated respectively, As the basis for correcting the lens forming mold 3.

It is better to respectively have a sharp angle 141,151 on the said notches 14,15, so that the notches 14,15 can still show a clearer and finer notch on the display screen 21 under the action of the backlight light source 22 The enlarged images of 14 and 15 are passed to improve the accuracy of the eccentricity side.

Referring again to Fig. 6, shown in 7, described notch 14,15 is to be located at the place of different diameters on the front and back plane part 12,13 of lens, as notch 14 is closer to optical surface 10, and notch 15 is farther away The optical surface 11 makes the front and rear two notches 14,15 can be displayed on the display screen 21 respectively by the tool microscope 2 and the video camera 20 as shown in Figure 7, then through the two notches 14,15 respectively on the display screen 21 Compared with the peripheral edge 16 of the lens 1, the eccentricity of the two different optical surfaces 10, 11 at the front and rear of the lens 1 can be determined respectively, so that the molding of the optical surfaces 10, 11 can be corrected accurately and efficiently. The molding surface 30/31 of the mold 3, and the correction operation of the mold 3 is simplified.

To sum up, the new molded lens provided with the notch for eccentricity detection can indeed achieve the above-mentioned effect through the structure disclosed above. And this model has not been seen in publications and has not been used publicly before the application, and it has met the requirements of novelty and progress for a model patent.

The above description is only illustrative, rather than restrictive, of the present invention. Those of ordinary skill in the art understand that many modifications and changes can be made without departing from the spirit and scope defined by the following appended claims. Or equivalent, but all will fall within the protection domain of the present utility model.

Claims (4)

1. A molded lens provided with notches for eccentricity detection, which utilizes a lens forming mold to manufacture, has front and rear two optical surfaces and front and rear two plane parts, is characterized in that: the front and rear surfaces of the lens Scores concentric with the optical surface are respectively provided on the flat part within the range that does not affect the shaping of the optical surface. 2. The molded lens provided with decenter detection notches according to claim 1, wherein there is at least one notch on said lens. 3. The molded lens provided with a notch for decentering detection according to claim 1, wherein the diameter of said notch is different in the front and rear plane parts of the lens. 4. The molded lens provided with a notch for decentration detection as claimed in claim 1, wherein a sharp corner is provided on said notch.

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