A folded long working distance compact microscopy optical structure

Abstract

The utility model relates to optical imaging detection technical field especially relates to a kind of long working distance compact microimaging optical structure of turn-back, it includes microimaging optical structure, and microimaging optical structure includes polarization mechanism, first turn-back imaging mechanism and second turn-back imaging mechanism;Polarization mechanism includes focusing objective, polaroid and polarization spectroscope, focusing objective is set in the lowermost, polaroid is set between focusing objective and polarization spectroscope, focusing objective, polaroid and polarization spectroscope are aligned with the setting of median axis, first turn-back imaging mechanism includes first 1 / 4 wave plate, first reflector and first focusing ocular, and second turn-back imaging mechanism includes second 1 / 4 wave plate, second reflector, third 1 / 4 wave plate, third reflector and second focusing ocular.The utility model is introduced by turn-back light path to reduce the structure of microscopical system, realize a kind of long working distance compact microstructure, improve portability.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging and detection technology, and in particular to a compact microscopic imaging optical structure with a long working distance and a folding-back design. Background Technology

[0002] In the field of optical imaging inspection, microscopy imaging technology occupies a pivotal position. Its image quality directly affects the accuracy and efficiency of inspection, making it a key factor in evaluating the capabilities of inspection technology. In industrial inspection, the dual telecentric lens inspection structure has significant application value. In practical applications, long working distances and compact sizes are often important indicators of microscope lens performance. However, the unique structure of the dual telecentric architecture typically results in a relatively long physical optical path.

[0003] In the design of microscope lenses, eliminating aberrations to ensure image clarity is the primary task, making working distance a crucial parameter that cannot be ignored. However, under the same magnification conditions, extending the object-side working distance often results in an increase in the overall length of the lens, which undoubtedly poses a challenge to the lens's portability and spatial adaptability. Therefore, how to maintain a long working distance while ensuring lens compactness has become an urgent problem to be solved. Thus, this invention designs a folding-type, long-working-distance, compact microscopic imaging optical structure. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a compact, long-working-distance microscopic imaging optical structure with a folding-back design.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A compact, long-working-distance, folding-back microscopic imaging optical structure includes a microscopic imaging optical structure comprising a polarization mechanism, a first folding-back imaging mechanism, and a second folding-back imaging mechanism. The polarization mechanism includes a focusing objective, a polarizer, and a polarizing beam splitter. The focusing objective is positioned at the bottom, and the polarizer is positioned between the focusing objective and the polarizing beam splitter. The focusing objective, polarizer, and polarizing beam splitter are aligned along their central axis.

[0007] Furthermore, the first reflex imaging mechanism includes a first quarter-wave plate, a first reflecting mirror, and a first focusing eyepiece.

[0008] Furthermore, the second reflex imaging mechanism includes a second quarter-wave plate, a second mirror, a third quarter-wave plate, a third mirror, and a second focusing eyepiece.

[0009] Furthermore, the first quarter-wave plate is positioned directly above the polarizing beam splitter, the first reflecting mirror is positioned directly above the first quarter-wave plate, and the first focusing eyepiece is positioned directly to the left of the polarizing beam splitter.

[0010] Furthermore, the second quarter-wave plate, the second mirror, the third quarter-wave plate, and the third mirror are symmetrically arranged on both sides of the polarizing beam splitter.

[0011] Furthermore, the second focusing eyepiece is positioned directly above the polarizing beam splitter.

[0012] Compared with related technologies, the compact microscopic imaging optical structure with a long working distance and a folding-back design proposed in this invention has the following advantages:

[0013] This invention discloses a compact microscopic imaging optical structure with a long working distance, which reduces the size of the microscopic system by introducing a folding optical path. This achieves a compact microscopic structure with a long working distance. When polarized light passes through polarizing optical elements, it propagates in different directions due to polarization. Introducing a mirror and a quarter-wave plate into the microscopic system shortens the optical path through the folding system. The main function of the microscopic structure is to convert linearly polarized light into circularly polarized light using a quarter-wave plate. After reflection from the object being measured, the light first becomes linearly polarized by a polarizer, then circularly polarized by a quarter-wave plate after reflection by a polarizing beam splitter, and finally linearly polarized by a polarizing beam splitter. This linearly polarized light then enters the camera after reflection by a polarizing beam splitter. Compared to traditional microscopic structures, this design significantly reduces the size of the structure, achieving a compact microscopic structure with a long working distance. This allows for a reduction in the size of the microscope using this structure, improving portability. Attached Figure Description

[0014] Figure 1 The structural principle of the compact microscopic imaging optical structure with a long working distance and a folding-back design proposed in this utility model. Figure One ;

[0015] Figure 2 The structural principle of the compact microscopic imaging optical structure with a long working distance and a folding-back design proposed in this utility model. Figure Two .

[0016] In the diagram: 1. Focusing objective lens; 2. Polarizer; 3. Polarizing beam splitter; 4. First quarter wave plate; 5. First reflecting mirror; 6. First focusing eyepiece; 7. Second quarter wave plate; 8. Second reflecting mirror; 9. Third quarter wave plate; 10. Third reflecting mirror; 11. Second focusing eyepiece. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1

[0019] Reference Figure 1 A compact, long-working-distance, folding-back microscopic imaging optical structure includes a microscopic imaging optical structure comprising a polarization mechanism, a first folding-back imaging mechanism, and a second folding-back imaging mechanism. The polarization mechanism includes a focusing objective 1, a polarizer 2, and a polarizing beam splitter 3. The focusing objective 1 is positioned at the bottom, and the polarizer 2 is positioned between the focusing objective 1 and the polarizing beam splitter 3. The focusing objective 1, the polarizer 2, and the polarizing beam splitter 3 are aligned along their central axis. The first folding-back imaging mechanism includes a first quarter-wave plate 4, a first reflecting mirror 5, and a first focusing eyepiece 6.

[0020] In this configuration, the first quarter-wave plate 4 is positioned directly above the polarizing beam splitter 3, the first reflecting mirror 5 is positioned directly above the first quarter-wave plate 4, and the first focusing eyepiece 6 is positioned directly to the left of the polarizing beam splitter 3.

[0021] With the above setup, the light emitted by the object first passes through the focusing objective lens 1, then through the polarizer 2, and becomes linearly polarized light. The polarizing beam splitter 3 is set to allow light to pass through in the same positive polarization direction as the polarizer 2. After passing through the polarizing beam splitter 3, the light enters the first quarter-wave plate 4 and is converted into circularly polarized light. After being emitted on the first reflecting mirror 5, the circularly polarized light changes its rotation direction. After passing through the first quarter-wave plate 4 again, its polarization state is deflected by 90 degrees compared to the previous light. After being reflected by the polarizing beam splitter 3, it enters the first focusing eyepiece 6 and is imaged on the imaging plane.

[0022] Example 2

[0023] Reference Figure 2 The front polarization mechanism in this embodiment is the same as that in Embodiment 1. The difference is that the second folding imaging mechanism in this embodiment includes a second quarter wave plate 7, a second reflecting mirror 8, a third quarter wave plate 9, a third reflecting mirror 10, and a second focusing eyepiece 11.

[0024] In this configuration, the second quarter-wave plate 7, the second reflecting mirror 8, the third quarter-wave plate 9, and the third reflecting mirror 10 are symmetrically arranged on both sides of the polarizing beam splitter 3, and the second focusing eyepiece 11 is positioned directly above the polarizing beam splitter 3.

[0025] With the above configuration, the light emitted by the object first passes through the focusing objective lens 1, then through the polarizer 2, and becomes linearly polarized light. The polarizing beam splitter 3 is set to reflect the light in the same positive polarization direction as the polarizer 2. After the light is reflected through the polarizing beam splitter prism, it enters the second quarter-wave plate 7 and is converted into circularly polarized light. After being reflected by the second mirror 8, the rotation direction of the circularly polarized light changes. After passing through the second quarter-wave plate 7 again, the polarization state of the light changes by 90 degrees compared to the previous light. After being transmitted through the polarizing beam splitter prism 3, it enters the third quarter-wave plate 9 and is converted into circularly polarized light again. After being reflected by the third mirror 10, the light changes polarization direction again after passing through the third quarter-wave plate 9. After being reflected by the polarizing beam splitter prism 3, it enters the second focusing eyepiece 11 and is finally focused and imaged on the imaging plane. Embodiment 2 makes the optical system smaller in size.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A compact, long-working-distance, folding-back microscopic imaging optical structure, characterized in that, It includes a microscopic imaging optical structure, which includes a polarization mechanism, a first folding imaging mechanism, and a second folding imaging mechanism; The polarization mechanism includes a focusing objective (1), a polarizer (2), and a polarizing beam splitter (3). The focusing objective (1) is located at the bottom, and the polarizer (2) is located between the focusing objective (1) and the polarizing beam splitter (3). The focusing objective (1), the polarizer (2), and the polarizing beam splitter (3) are aligned along the central axis. The first refraction imaging mechanism includes a first quarter wave plate (4), a first reflecting mirror (5), and a first focusing eyepiece (6). The second refraction imaging mechanism includes a second quarter wave plate (7), a second reflecting mirror (8), a third quarter wave plate (9), a third reflecting mirror (10), and a second focusing eyepiece (11). The first quarter wave plate (4) is located directly above the polarizing beam splitter (3), the first reflecting mirror (5) is located directly above the first quarter wave plate (4), and the first focusing eyepiece (6) is located directly to the left of the polarizing beam splitter (3).

2. The compact microscopic imaging optical structure with a long working distance and a folding-back design according to claim 1, characterized in that, The second quarter wave plate (7), the second reflector (8), the third quarter wave plate (9) and the third reflector (10) are symmetrically arranged on both sides of the polarizing beam splitter (3).

3. The compact microscopic imaging optical structure with a long working distance and a folding-back design according to claim 1, characterized in that, The second focusing eyepiece (11) is positioned directly above the polarizing beam splitter (3).

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