Magnifier light path system

Abstract

The utility model relates to the technical field of magnifying lenses, in particular to a magnifying lens optical path system, which comprises a triplet lens group. The triplet lens group is composed of a positive lens, a first negative lens and a second negative lens, one surface, with a large curvature radius, of each of the first negative lens and the second negative lens is plated with an antireflection film, the wave band peak value is 550 nm, the wave band is 400-700 nm, and the transmittance is greater than or equal to 98%; no air gap exists between the positive lens and the first negative lens and between the positive lens and the second negative lens, and the positive lens is glued with the first negative lens and the second negative lens through photosensitive glue. According to the utility model, through designing the light path system of the magnifying glass, the problems of magnification times and clearness of the existing magnifying glass are solved, and the magnifying glass has a good market prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of magnifiers, in particular to a magnifier optical path system. Background Art

[0002] Magnifier: A simple visual optical device used to observe tiny details of an object. It is a converging lens with a focal length much smaller than the clear vision distance of the eye. With the continuous creation of science and technology, there are more and more types of magnifiers. In the existing technology, the appearance and fill light functions of the magnifier are usually improved, but the optical path system of the magnifier is often ignored. The optical path system plays an important role in the magnification and clarity of the magnifier.

[0003] Based on this, we designed an optical path system of a magnifying glass. Utility Model Content

[0004] The utility model aims to provide a magnifying glass optical path system to solve the problems pointed out in the background technology.

[0005] The embodiment of the utility model is realized by the following technical scheme: a magnifying glass optical path system, including a triple cemented lens group;

[0006] The triplet lens group is composed of a positive lens, a first negative lens and a second negative lens, wherein the first negative lens and the second negative lens have a larger curvature radius and are coated with an anti-reflection film, and the band peak is 550nm, the band is 400nm-700nm, and the transmittance is greater than or equal to 98%;

[0007] There is no air gap between the positive lens and the first negative lens and the second negative lens, and they are glued together by photosensitive adhesive.

[0008] According to a preferred embodiment, the positive lens is a biconvex lens;

[0009] The first negative lens and the second negative lens are meniscus lenses.

[0010] According to a preferred embodiment, the radius of the biconvex lenses is 7.05 mm;

[0011] The convex surface radius of the meniscus lens is 13.521 mm, and the concave surface radius is 7.05 mm.

[0012] According to a preferred embodiment, the diameter of the positive lens is

[0013] The diameters of the first negative lens and the second negative lens are

[0014] According to a preferred embodiment, the center thickness of the positive lens is 9.2±0.1 mm, and the edge thickness is 3.1 mm;

[0015] The center thickness of the first negative lens and the second negative lens is 1±0.05 mm, and the edge thickness is 2.5 mm.

[0016] According to a preferred embodiment, the eccentricity C of the positive lens is less than or equal to 0.02;

[0017] The eccentricity C of the first negative lens and the second negative lens is less than or equal to 0.03.

[0018] According to a preferred embodiment, it also includes an eyepiece frame, a protective cover is provided on one side of the eyepiece frame, and the protective cover is connected to the eyepiece frame by rivets.

[0019] According to a preferred embodiment, a pressure ring is provided in front of the triplet lens group, and the triplet lens group is radially positioned by the pressure ring.

[0020] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects: the utility model not only improves the problems of magnification and clarity of existing magnifiers by designing the optical path system of the magnifier, but also has good market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of the optical path system of the magnifying glass provided in Example 1 of the utility model;

[0022] Figure 2 A side view of the optical path system of the magnifying glass provided in Example 1 of the utility model;

[0023] Figure 3 A perspective view of the optical path system of the magnifying glass provided in Example 1 of the utility model;

[0024] Icon: 1-protective cover, 2-rivet, 3-pressure ring, 4-eyepiece frame, 5-triplet lens group. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Example 1

[0027] like Figure 1As shown, the embodiment of the utility model provides a magnifying glass optical path system, the optical path system includes a triplet lens group, the triplet lens group 5 is composed of a positive lens, a first negative lens and a second negative lens

[0028] (1) The positive lens is a biconvex lens with the following parameters:

[0029] The material is H-K9L, the diameter is Radius R1: 7.05mm, radius R2: 7.05mm, center thickness d is 9.2±0.1mm, edge thickness (t=3.1mm is the reference size), eccentricity C is less than or equal to 0.02, surface shape N=3, ΔN=0.5, surface finish B=Grade IV, chamfer: 0.3x45°.

[0030] (2) The first negative lens and the second negative lens are concave-convex lenses, and the parameters are as follows:

[0031] The material is F4, the diameter is Convex radius R1: 13.521mm, concave radius R2: 7.05mm, center thickness is 1±0.05mm, edge thickness is (t=2.5mm is the reference size), eccentricity C is less than or equal to 0.03, surface type N=3, ΔN=0.3, surface finish B=Grade IV, chamfer: 0.3x45°, the side with a larger radius of curvature is coated with an anti-reflection film, the band peak is 550nm, the band is 400nm-700nm, and the transmittance is greater than or equal to 98%.

[0032] There is no air gap between the positive lens and the first negative lens and the second negative lens, and they are glued together by photosensitive glue, and the glue layer has no impurities, bubbles and other defects. The combined focal length f ′ =18±1.

[0033] Furthermore, if Figure 2 , Figure 3 As shown, the optical path system also includes an eyepiece frame 4, and a protective cover 1 is provided on one side of the eyepiece frame 4. The protective cover 1 is connected to the eyepiece frame 4 through a rivet 2. By canceling the limit of the protective cover 1 by the rivet 2, the protective cover 1 can be moved along the eyepiece frame 4 to cover the entire eyepiece frame 4 so as to protect the triple-cemented lens group 5.

[0034] Furthermore, in the eyepiece frame 4 of the present embodiment, a pressing ring 3 is provided in front of the triplet lens group 5 , and the triplet lens group 5 is radially positioned by the pressing ring 3 .

[0035] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects: the utility model not only improves the problems of magnification and clarity of existing magnifiers by designing the optical path system of the magnifier, but also has good market prospects.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnifying glass optical path system, characterized in that: comprising a triplet lens group (5); The triplet lens group (5) is composed of a positive lens, a first negative lens and a second negative lens, wherein the first negative lens and the second negative lens have a larger curvature radius and are coated with an anti-reflection film, and the peak value of the wavelength is 550nm, the wavelength is 400nm-700nm, and the transmittance is greater than or equal to 98%; There is no air gap between the positive lens and the first negative lens and the second negative lens, and they are glued together by photosensitive adhesive.

2. The magnifying glass optical path system according to claim 1, characterized in that: The positive lens is a biconvex lens; The first negative lens and the second negative lens are meniscus lenses.

3. The magnifying glass optical path system as claimed in claim 2, characterized in that: The radius of the biconvex lenses is 7.05 mm; The convex surface radius of the meniscus lens is 13.521 mm, and the concave surface radius is 7.05 mm.

4. The magnifying glass optical path system according to claim 1, characterized in that: The diameter of the positive lens is The diameters of the first negative lens and the second negative lens are 5. The magnifying glass optical path system according to claim 1, characterized in that: The center thickness of the positive lens is 9.2±0.1 mm, and the edge thickness is 3.1 mm; The center thickness of the first negative lens and the second negative lens is 1±0.05 mm, and the edge thickness is 2.5 mm.

6. The magnifying glass optical path system according to claim 1, characterized in that: The eccentricity C of the positive lens is less than or equal to 0.02; The eccentricity C of the first negative lens and the second negative lens is less than or equal to 0.

03.

7. The magnifying glass optical path system according to any one of claims 1 to 6, characterized in that: It also comprises an eyepiece frame (4), one side of the eyepiece frame (4) is provided with a protective cover (1), and the protective cover (1) is connected to the eyepiece frame (4) via a rivet (2).

8. The magnifying glass optical path system according to claim 7, characterized in that: A pressing ring (3) is arranged in front of the triple-cemented lens group (5), and the triple-cemented lens group (5) is radially positioned by the pressing ring (3).

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