Beam splitting device and beam splitter

Abstract

The disclosure discloses a beam splitting device and a beam splitter, which comprises a prism base, a prism, a positioning surface and a fixing structure; the prism is arranged on the upper surface of the prism base; the positioning surface is arranged on the upper surface of the prism base and is attached to the two adjacent surfaces of the prism which are perpendicular to the upper surface of the prism base, so as to position the prism; and the fixing structure is in abutment with the positioning surface, the upper surface of the prism base and the upper surface of the prism, so that the prism is fastened with the prism base. The disclosure can ensure that the beam splitting device has good light splitting effect in a large-aperture optical system, ensures the same optical path and improves the system accuracy.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of optical-mechanical systems, and in particular to a beam splitting device and a beam splitter. BACKGROUND

[0002] The beam splitting device is used to split a light beam into two light beams, and is widely used in optical-mechanical systems. In current optical-mechanical systems and experimental platforms, the light aperture of the beam splitting device is usually small, generally about one inch, and it is difficult to use in optical-mechanical systems with larger field angles and numerical apertures. Moreover, the light splitting film in the beam splitting device usually splits the light beam energy into two beams equally, and sometimes different light beam energy ratios are required for optical-mechanical systems with different use scenarios. The current beam splitting device is difficult to meet the needs and the application range is limited. SUMMARY

[0003] The purpose of the present disclosure is to provide a beam splitting device and a transformer to increase the light aperture and improve the light splitting effect in large-aperture optical systems.

[0004] To achieve the above purpose, the present disclosure provides a beam splitting device, comprising:

[0005] a prism base, a prism, a positioning surface, and a fixing structure.

[0006] The prism is placed on the upper surface of the prism base.

[0007] The positioning surface is placed on the upper surface of the prism base and is attached to the two adjacent surfaces of the prism perpendicular to the upper surface of the prism base 1 to achieve positioning of the prism.

[0008] The fixing structure is in contact with the positioning surface, the upper surface of the prism base, and the upper surface of the prism, so that the prism is tightly fixed to the prism base.

[0009] The present disclosure also provides a beam splitter comprising the above beam splitting device.

[0010] The beam splitting device of the present disclosure, through the interaction of the prism base, the prism, the positioning surface, and the fixing structure, the prism is placed on the upper surface of the prism base; the positioning surface is placed on the upper surface of the prism base and is attached to the two adjacent surfaces of the prism perpendicular to the upper surface of the prism base 1 to achieve positioning of the prism; the fixing structure is in contact with the positioning surface, the upper surface of the prism base, and the upper surface of the prism, so that the prism is tightly fixed to the prism base, to achieve better attachment between the prism base and the prism, form a complete and stable structure, ensure that the optical paths of the two light beams after splitting are equal, and reduce imaging errors. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic diagram of the overall internal structure of a beam splitting device according to an embodiment of the present disclosure;

[0012] Figure 2 is a schematic diagram of the overall appearance structure of a beam splitting device according to an embodiment of the present disclosure;

[0013] Figure 3 is a schematic diagram of the front view structure of a beam splitting device according to an embodiment of the present disclosure;

[0014] Figure 4 is a schematic diagram of the structure of a beam splitting device provided with a slide and a filter according to an embodiment of the present disclosure;

[0015] Figure 5A is a schematic diagram of the oblique view structure of a slide and a filter according to an embodiment of the present disclosure;

[0016] Figure 5B is a schematic diagram of the front view structure of a slide and a filter according to an embodiment of the present disclosure;

[0017] Figure 6 is a schematic diagram of the structure of a filter and an attenuator holder according to an embodiment of the present disclosure.

[0018] In the drawings:

[0019] 1, prism base; 2, prism; 3, positioning surface; 4, upper top plate; 5, pressing plate; 6, 7, light shielding plate; 8, top screw; 9, attenuator holder; 10, filter holder; 11, slide; 12, light splitting film; 13, support structure.

[0020] The implementation, functional features and advantages of the present disclosure will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0021] It should be understood that the specific embodiments described herein are merely intended to explain the present disclosure and are not intended to limit the present disclosure.

[0022] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is further understood that the terms "comprise" and "comprising" and the like, when used in the specification, specify the presence of stated features, integers, steps, operations, elements, units, modules, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It is further understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can be present. In addition, the use of "connection" or "coupling" herein also includes wireless connection or wireless coupling. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] With reference to Figures 1-6 In an embodiment of the present disclosure, a beam splitting device comprises:

[0024] The prism base 1, the prism 2, the positioning surface 3, the fixing structure (not numbered). The prism 2 is placed on the upper surface of the prism base 1; the positioning surface 3 is placed on the upper surface of the prism base 1 and is in contact with the two adjacent surfaces of the prism 2 perpendicular to the upper surface of the prism base 1 to achieve positioning of the prism 2. Specifically, the number of positioning surfaces 3 is two, which are arranged perpendicular to each other on the upper surface of the prism base 1, and the prism 2 has four surfaces perpendicular to the upper surface of the prism base 1, of which two adjacent surfaces are in contact with the two positioning surfaces 3, respectively, so that the direction of the prism 2 can be accurately positioned by the positioning surfaces 3; the fixing structure is in abutment with the positioning surface 3, the upper surface of the prism base 1 and the upper surface of the prism 2, so that the prism 2 is tightly fixed with the prism base 1. The accuracy of the upper surface of the prism base 1 and the positioning surface 3 is slightly higher than that of the prism 3 in the form and position tolerance, so as to achieve better contact between the prism base 1 and the prism 3 and to minimize the stress and pressure between the prism base 1 and the prism 3. Moreover, the clear aperture of the beam splitting device is much larger than one inch, reaching more than four inches, which can meet the requirements of the use scenarios with larger field of view angle and numerical aperture and can ensure that the optical paths of the two beams after beam splitting are equal, so as to reduce the imaging error.

[0025] In one embodiment, the fixing structure comprises the upper top plate 4, the pressing plate 5 and the light shielding plate 6, 7; the light shielding plate 6, 7 respectively adheres to the corresponding positioning surface 3, that is, the light shielding plate 6 adheres to one of the positioning surfaces 3, and the light shielding plate 7 adheres to the other positioning surface 3, and the light shielding plate 6, 7 is perpendicular to the upper surface of the prism base 1; the pressing plate 5 is placed on the upper surface of the prism 2 and abuts against each other, and the prism 2 is pressed tightly; the upper top plate 4 is perpendicular to the light shielding plate 6, 7 and abuts against each other, thereby forming the outside of the fixing structure; in the inside of the fixing structure, the cavity is formed between the upper top plate 4 and the pressing plate 5, and the upper top plate 4 and the pressing plate 5 are fixed by installing the top screw 8 in the cavity 5, thereby forming the fixing structure to stabilize the prism 2 and the prism base 1.

[0026] In one embodiment, the lower surface of the pressing plate 5 is coated with glue and abuts against the upper surface of the prism 2, and for the prism 3 with large volume and mass, the traditional spring sheet pressing mode with small contact area provides limited supporting force, and even if the supporting force is increased, it is possible to cause the refractive index to change or even the edge to collapse due to excessive pressure in the local part, and by coating the lower surface of the pressing plate 5 with glue to increase the direct friction force with the upper surface of the prism 2 and better disperse the pressure of the top screw 8, the damage of the prism 2 caused by the refractive index change or even the edge collapse due to excessive pressure in the local part can be avoided.

[0027] In one embodiment, the beam splitting device further comprises the support structure 13 extending along the bottom of the two opposite sides of the prism base 1, the slide 11 is fixedly installed on the support structure 13, and the slide 11 adheres to the side of the prism base 1; the attenuation sheet rack 9 and the alternative filter rack 10 are installed on the slide 11, and the attenuation sheet rack 9 and the alternative filter rack 10 can slide up and down along the side of the prism base 1 through the slide 11, so that in the use process, different degrees of attenuation sheet or different waveband filters are selected to meet the use requirements of different lights of the two light beams after light splitting.

[0028] In one embodiment, the attenuation sheet rack 9 and the alternative filter rack 10 are circular rectangular structures, and the attenuation sheet rack 9 and the alternative filter rack 10 have the same structure, and the attenuation sheet rack 9 is taken as an example for description, the positioning clamping groove 91 and the pushing handle 92 are arranged side by side on one side of the circular rectangular structure of the attenuation sheet rack 9, and the middle part of the circular rectangular structure is the mounting hole 93 for installing the attenuation sheet, and the mounting hole of the alternative filter rack 10 is for installing the filter. The Figure 5A and Figure 5BThe middle attenuation piece rack 9 and the alternative filter rack 10 are put into the slide 11 and then installed on the support structure 13 of the prism base 1. During use, different degrees of attenuation pieces or different waveband filters can be selected to achieve the use requirements of different light of the two light beams after splitting. Specifically, the attenuation piece rack 9 is pushed by the push handle 92 to slide upward. When the positioning clamping groove 91 of the attenuation piece rack 9 enters the clamping spring, the attenuation piece rack 9 is fixed, thereby completing the selection of the required attenuation piece. When not in use, the attenuation piece rack 9 is pressed downward by the push handle 92 to make the positioning clamping groove 91 disengage from the clamping spring, and the attenuation piece rack 9 slides down to the lower part of the slide rail of the slide 11. Similarly, the operation of the alternative filter rack 10 is the same as that of the attenuation piece rack 9.

[0029] In one embodiment, the light splitting device further comprises a light splitting film 12, through which the light beam energy is evenly split into two beams. For optical-mechanical systems with different use scenario requirements, the proportion of different light fluxes can be adjusted by selecting different attenuation pieces. Narrowband filters can also be selected to achieve the selection of different RGB channels. For example, by selecting different filters and attenuation pieces, the energy proportion of the two light beams after splitting can be changed. For example, by selecting an attenuation piece with a 50% transmittance, the light flux ratio between the two light beams is 4:1.

[0030] The beam splitting device of the above embodiment, through the interaction of the prism base 1, the prism 2, the positioning surface 3, and the fixing structure, the prism 2 is placed on the upper surface of the prism base 1; the positioning surface 3 is placed on the upper surface of the prism base 1 and is attached to the two adjacent surfaces of the prism 2 perpendicular to the upper surface of the prism base 1 to achieve the positioning of the prism 2; the fixing structure is in contact with the positioning surface 3, the upper surface of the prism base 1, and the upper surface of the prism 2, so that the prism 2 is tightly fixed with the prism base 1 to achieve better attachment between the prism base 1 and the prism 3, form a complete and stable structure, and ensure that the optical paths of the two light beams after splitting are equal to reduce imaging errors.

[0031] In an embodiment of the present disclosure, a beam splitter comprises the beam splitting device of the above embodiment.

[0032] The above description is only the preferred embodiments of the present disclosure, and does not limit the patent scope of the present disclosure. Any equivalent structure or equivalent process transformation based on the content of the present disclosure and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present disclosure.

Claims

1. A beam splitting device, characterized by, The prism base, the prism, the positioning surface, the fixing structure; The prism is placed on the upper surface of the prism base; The positioning surface is placed on the upper surface of the prism base, and is in contact with two adjacent surfaces of the prism perpendicular to the upper surface of the prism base to achieve the positioning of the prism; the number of the positioning surface is two, which are arranged perpendicular to each other on the upper surface of the prism base, and the prism has four surfaces perpendicular to the upper surface of the prism base, wherein two adjacent surfaces are in contact with the two positioning surfaces respectively; The fixing structure is in contact with the positioning surface, the upper surface of the prism base and the upper surface of the prism, so that the prism is fastened with the prism base; The fixing structure further comprises a light shield plate, which is in contact with the corresponding positioning surface, i.e. the first light shield plate is in contact with one of the positioning surfaces, and the second light shield plate is in contact with the other positioning surface; The light aperture of the beam splitting device is more than four inches. The fixing structure comprises an upper top plate and a pressing plate; 2. The beam splitting device of claim 1, wherein The light shield plate is in contact with the positioning surface and perpendicular to the upper surface of the prism base; The pressing plate is placed on the upper surface of the prism and in contact with each other; The upper top plate is perpendicular to the light shield plate and in contact with each other; The upper top plate and the pressing plate form a cavity in the middle, and the upper top plate and the pressing plate are fixed by installing a top screw in the cavity. The lower surface of the pressing plate is in contact with the upper surface of the prism after being coated with glue.

3. The beam splitting device of claim 2, wherein The beam splitting device further comprises a support structure extending along the bottom of the two opposite surfaces of the prism base, and a slide is fixedly installed on the support structure, and the slide is in contact with the side surface of the prism base; 4. The beam splitting device of claim 1, wherein The slide is installed with an attenuation plate rack and an alternative filter rack, which can slide up and down along the side surface of the prism base through the slide. The attenuation plate rack and the alternative filter rack are circular rectangular structures, and a positioning slot and a pushing handle are arranged side by side on one side of the circular rectangular structure, and the middle part of the circular rectangular structure is an installation hole for installing an attenuation plate or a filter.

5. The beam splitting device of claim 4, wherein, The beam splitting device further comprises a light splitting film.

6. The beam splitting device of claim 1, wherein, The beam splitting device comprises any one of claims 1-6.

7. A beam splitter, characterized by The beam splitting device comprises any one of claims 1-6.

Images