CN201497460U - Lens edge uniform thickness difference measuring device with adjustable diameter - Google Patents

Abstract

The utility model relates to a lens edge uniform thickness difference measuring device with the adjustable diameter, which comprises a base (2) and a regulating disc (3), wherein the regulating disc (3) is arranged on the base (2). The utility model is characterized in that three I-shaped chutes are formed on the regulating disc (3), movable fulcrum frames (1) are arranged in the chutes, steel balls (7) and fastening knurling locking bolts (6) are arranged on each fulcrum frame (1), a measuring meter frame (4) is arranged on the edge part of the regulating disc (3), and a measuring meter (5) is arranged on the measuring meter frame (4). The utility model has the advantages of simple structure and convenient use, can easily measure the lens edge uniform thickness difference at high efficiency without adding other measuring tools, and the fulcrum size is changed by only using the regulating disc, so the lenses with the diameter between 10 and 140 can be measured, and the utility model is suitable for being used by various optical cold processing enterprises.

Description

Adjustable diameter lens edge equal thickness difference detection device

technical field

The utility model relates to an optical detection instrument, in particular to a detection device for detecting the thickness difference at the edge of a lens, in particular to a detection device for the thickness difference at the edge of an adjustable diameter lens.

Background technique

As we all know, in order to meet the imaging needs of the optical system, the spherical center of each lens surface in the system should be on the same straight line, which is called the optical axis of the system. For a single lens, the straight line passing through the centers of the two spheres is called the optical axis, the straight line passing through the vertices of the two curved surfaces is called the geometric axis, and the misalignment between the geometric axis and the optical axis (space intersection or parallel stagger) is called the center deviation (indicated by the letter C).

The general lens processing is first rough and fine grinding, then polishing, and finally edging to ensure that the optical axis of the lens coincides with its geometric axis, and the edge equal thickness difference Δt (shown in Figure 1) is greater than the given value of the formula It is impossible to make the optical axis coincide with the geometric axis by edging, so it is necessary to measure and control the thickness difference at the edge during the rough and fine grinding stages of the lens. As far as the applicant knows, there is no corresponding detection device available for use at present.

Contents of the invention

The purpose of this utility model is to solve the problem that the production efficiency and product quality are affected by the lack of a corresponding edge thickness detection device in lens processing, and to design a highly versatile and versatile device that can quickly measure the equal thickness difference of the lens edge. Thickness difference detection device such as diameter adjustment lens edge.

The technical scheme of the utility model is:

A device for detecting thickness difference such as the edge of an adjustable diameter lens, including a base 2 and an adjustment disc 3, the adjustment disc 3 is installed on the base 2, and the feature is that there are three I-shaped chutes on the adjustment disc 3, and the chute A movable fulcrum frame 1 is installed in the middle, and each fulcrum frame 1 is equipped with a steel ball 7 and a knurled locking bolt 6 for tightening, and a detection meter frame 4 is installed on the edge of the adjustment disc 3, and the detection meter 5 is installed on the On the detection table frame 4.

The angles between the three fulcrums 1 are 120 degrees.

The beneficial effects of the utility model:

The utility model solves the urgent needs of production, has a simple structure, is suitable for detecting lenses of various diameters and thicknesses, and is beneficial to improving production efficiency and product quality.

The utility model can measure the thickness difference of the edge of the lens simply and efficiently, without adding other measuring tools, and only uses the adjustment disc to change the fulcrum size, so that the lens with a diameter of 10 to 140 can be measured, and is suitable for various optical cold processing enterprises.

Description of drawings

Fig. 1 is a schematic diagram of the offset position of the optical axis and the geometric axis of the lens of the present invention.

Fig. 2 is an optical diagram of the biconvex lens of the present invention.

Fig. 3 is a schematic structural view of the detection device of the present invention.

FIG. 4 is a top view of FIG. 3 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figures 2, 3, and 4.

A device for detecting thickness difference such as the edge of an adjustable diameter lens, comprising a base 2 and an adjustment disc 3, the adjustment disc 3 is installed on the base 2, and the adjustment disc 3 is equipped with three chutes with a phase difference of 120 degrees (such as Figure 4), the fulcrum frame 1 is installed in the chute, the rotatable steel ball 7 and the knurled fastening bolt 6 for tight positioning are installed on the fulcrum frame 1, and the detection table frame 4 is installed on the edge part of the adjustment disc 3 , the detection table 5 is installed on the detection table frame 4, as shown in Figure 3.

The using method of the utility model is:

(1) Loosen the knurled fastening bolt 6 on the fulcrum frame 1 and adjust its size to place the lens 8 to be tested in the middle.

(2) Place the lens 8 to be tested on the steel ball 7 on the fulcrum frame 1 .

(3) Adjust the position of the fulcrum frame 1 so that the lens 8 (as shown in FIG. 2 ) can just rotate on the ball.

(4) Tighten the knurled fastening bolt 6 on the fulcrum frame 1 .

(5) Move the dial gauge (or dial gauge) so that the gauge head is at the edge of the lens 8.

(6) Rotate the lens 8 to read the number of divisions that the pointer on the dial indicator (or dial indicator) moves, which is the edge equal thickness difference of the lens.

Fig. 2 is a schematic diagram of detection and calculation of the present invention. In processing, the outer diameter needs to be enlarged by 1.5 mm, that is, 31.5 mm. Then, according to the calculation formula of lens edging allowance,

Δt=ΔΦ(Φ+ΔΦ)(R1+R2-d)/2R1R2

＝1.5×(30+1.5)×(200+300-10)/2×200×300

=0.19mm

Φ——the diameter of the lens after edging

ΔΦ——Lens outer diameter magnified size

R1, R2 - the radius of curvature of the two sides of the lens

d——lens center thickness value

It can be concluded that during the rough and fine grinding process, the thickness difference of the control edge is 0.19mm. After the fine grinding is completed, select the dial indicator to be installed on the table frame, and adjust the fulcrum frame 1 according to the steps in the above method of use, and place the lens 8. Lock the knurled fastening bolt 6 and turn the lens. If the pointer on the dial gauge 5 moves within 19 grids, the lens can be transferred to the polishing process; if the pointer on the dial gauge 5 moves more than 19 grids, then the lens needs to be repaired, and the thickness difference at the edge should be corrected again.

The parts not involved in the utility model are all the same as the prior art or can be realized by adopting the prior art.

Claims (2)

1. A device for detecting thickness differences such as the edge of an adjustable diameter lens, comprising a base (2) and an adjustment disc (3), the adjustment disc (3) is installed on the base (2), and is characterized in that the adjustment disc (3) ) There are three I-shaped chutes, and a movable fulcrum frame (1) is installed in the chute, and a steel ball (7) and a knurled locking bolt (6) for fastening are installed on each fulcrum frame (1) , a detection table frame (4) is installed on the edge portion of the adjustment disc (3), and the detection table (5) is installed on the detection table frame (4). 2. The device for detecting equal thickness difference at the edge of an adjustable-diameter lens according to claim 1, characterized in that the angle between the three fulcrum frames (1) is 120 degrees.

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