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Double-telecentric prime lens

A fixed-focus lens and double-telecentric technology, applied in the field of optical systems, can solve the problems of high-level telecentricity, low pixel resolution, and interference with lens imaging quality, etc., to achieve uniform brightness and clear image quality of imaging pictures Bright, clear and excellent imaging effect

Pending Publication Date: 2018-10-02
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of its structural design, the telecentricity of the telecentric lens on the object side and the image side cannot meet a high level at the same time, and the pixel resolution is low, and the prism in it will cause the light source to form a bright spot in the center of the imaging surface, which interferes The image quality of the lens

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, in this embodiment, the first lens group G1 with positive refractive power, the second lens group G2 with positive refractive power, the special-shaped reentrant prism LL, and the diaphragm are arranged in sequence from the object side to the image side along the light incident direction. STP, a third lens group G3 with positive refractive power, and an imaging surface IMG.

[0036] The first lens group includes: a first lens L1 with positive power, a second lens L2 with positive power, and an aspherical third lens L3 with negative power.

[0037] The second lens group includes: a fourth cemented lens L4 with negative refractive power and the cemented surface facing the image side, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, and a sixth lens L6 with negative optical power. The seventh lens L7 with positive refractive power, and the eighth lens L8 with positive refractive power.

[0038] The...

Embodiment 2

[0055] Such as Figure 4 Shown is a schematic diagram of the structure of this embodiment. Compared with Embodiment 1, the third lens L3 of the first lens group in this embodiment adopts a spherical lens with negative refractive power, and the eighth lens L8 of the second lens group adopts a positive refractive power and the glued surface faces the image. square eighth cemented lens.

[0056] Specifically, the telecentric fixed-focus lens described in this embodiment has an effective focal length of 275 mm and an object-image distance of 380 mm.

[0057] The lens structure parameters of the present embodiment are specifically as follows:

[0058]

[0059]

[0060] The absolute values ​​of the ratios of the focal length of the first lens group, the second lens group, and the third lens group to the overall focal length of the lens in this embodiment satisfy 0.63, 0.67, and 0.52 in sequence. The reasonable focal length ratio of the lens group can balance the axial chrom...

Embodiment 3

[0067] Such as Figure 6 Shown is a schematic diagram of the structure of this embodiment. Compared with Embodiment 1, a thirteenth lens L13 with positive refractive power is further provided behind the twelfth lens L12 in the third lens group in this embodiment to increase the image-side telecentricity.

[0068] Specifically, the telecentric fixed-focus lens described in this embodiment has an effective focal length of 128 mm and an object-image distance of 380 mm.

[0069] The lens structure parameters of the present embodiment are specifically as follows:

[0070]

[0071]

[0072] The absolute values ​​of the ratios of the focal length of the first lens group, the second lens group, and the third lens group to the overall focal length of the lens in this embodiment satisfy 0.72, 0.62, and 0.55 in sequence. The reasonable focal length ratio of the lens group can balance the axial chromatic aberration caused by imaging.

[0073] The object-space telecentricity and t...

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Abstract

Provided in the invention is a double-telecentric prime lens comprising a first lens group having a positive focal power, a second lens group having a positive focal power, a specially-shaped return prism, a diaphragm, a third lens group having a positive focal power and an imaging plane with an optical sensor. The above-mentioned units are arranged successively from an object side to an image side. The specially-shaped return prism consists of three triangular prisms; the first triangular prism and the second triangular prism are glued by facing each other; and the third triangular prism andthe first triangular prism are glued in opposite. The lens has advantages of high telecentricity, 8-M high resolution, and good central bright spot prevention effect.

Description

technical field [0001] The invention relates to a technology in the field of optical systems, in particular to a bi-telecentric fixed-focus lens on the object side and the image side. Background technique [0002] The magnification of the image obtained by the telecentric lens within a certain range of object distance will not change. It is mainly divided into two types: object telecentric and image telecentric, which are used to eliminate the readings caused by inaccurate focusing on the object respectively. Error and used to eliminate the measurement error caused by inaccurate focusing on the image side. Due to the characteristics of its structural design, the telecentricity of the telecentric lens on the object side and the image side cannot meet a high level at the same time, and the pixel resolution is low, and the prism in it will cause the light source to form a bright spot in the center of the imaging surface, which interferes image quality of the lens. Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/22G02B13/18G02B17/08
CPCG02B13/18G02B13/22G02B17/08
Inventor 尚洁阳诸益炜盛亚茗
Owner JIAXING ZHONGRUN OPTICAL TECH
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