一种双光测距成像光学系统的分光棱镜组件
By improving the structure of the beam splitter prism assembly, ensuring that the inclined planes of prism one and prism two are parallel to each other and have an included angle of 45°±0.5°, and using a titanium oxide film and adhesive layer for connection, the problem of insufficient light transmittance in the prior art is solved, and a dual-light ranging imaging optical system with high light transmittance is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN MAVINLENS OPTICAL CO LTD
- Filing Date
- 2025-08-13
- Publication Date
- 2026-07-17
AI Technical Summary
The beam splitter prism components of existing dual-light ranging imaging optical systems cannot simultaneously achieve a transmittance of 88% for both visible light and 850 nm-940 nm light, which affects product quality.
The inclined planes of prism one and prism two are parallel and opposite each other, with an included angle α of 45°±0.5°. A beam-splitting film is coated on the inclined plane. Prism one and prism two are bonded together with an adhesive layer. The laser is reflected by prism one and emitted from the top surface one. Visible light passes through prism one, enters the adhesive layer, then enters prism two and is emitted from the back surface two. The surfaces of prism one and prism two are coated with an anti-reflection film.
It achieved a transmittance of over 88% for both visible light and 850nm-940nm light, thus improving product quality.
Smart Images
Figure CN224518987U_ABST
Abstract
Claims
1. A beam-splitting prism assembly for a dual-beam ranging imaging optical system, comprising a first prism (1) located above and a second prism (2) located below, wherein: Prism 1 (1) includes front surface 1 (11), inclined surface 1 (12) and top surface 1 (13). Front surface 1 (11), inclined surface 1 (12) and top surface 1 (13) are all planes. Front surface 1 (11) is perpendicular to the optical axis L. Inclined surface 1 (12) is located behind front surface 1 (11) and has an angle α with optical axis L. Top surface 1 (13) is located above inclined surface 1 (12) and is perpendicular to front surface 1 (11). Prism 2 (2) includes inclined plane 2 (22) and back plane 2 (24). Both inclined plane 2 (22) and back plane 2 (24) are planes. Back plane 2 (24) is perpendicular to the optical axis L. Inclined plane 2 (22) is located in front of back plane 2 (24). Inclined plane 1 (12) is parallel to inclined plane 2 (22) and is vertically opposite to it. Inclined plane 1 (12) is coated with a beam-splitting film, and the included angle α is 45°±0.5°. The feature is that: an adhesive layer (4) is filled between the first inclined plane (12) and the second inclined plane (22) so as to bond the first prism (1) and the second prism (2) together; the beam-splitting film on the first inclined plane (12) is a titanium oxide film. The laser enters the prism (1) through the front face (11), and is reflected by the inclined surface (12) and emitted from the top surface (13); Visible light enters prism 1 (1) through front face 1 (11), passes through inclined face 1 (12) and enters glue layer (4), then enters prism 2 (2) through inclined face 2 (22), and finally passes through back face 2 (24) and is emitted.
2. The light splitting prism assembly of a dual optical ranging imaging optical system according to claim 1, wherein: The wavelength of the laser is 905 nanometers, and the length of the reflected optical axis AOB of prism one (1) is in the range of 10.49 mm ± 0.05 mm.
3. The beam splitting prism assembly of a dual optical ranging imaging optical system according to claim 1 or 2, characterized in that: The length of the optical axis AC of visible light and light in the 850-940 nm band passing through prism one (1) and prism two (2) is in the range of 7.48 mm ± 0.05 mm.
4. The light splitting prism assembly of a dual optical ranging imaging optical system according to claim 3, wherein: Anti-reflective coatings are applied to the front surface (11), top surface (13), bevel surface (22), and back surface (24).
5. The beam splitting prism assembly of a dual optical ranging imaging optical system according to claim 4, wherein: Prism 1 (1) also includes back face 1 (14), left face 1 (15) and right face 1 (16). Back face 1 (14) is parallel to front face 1 (11), left face 1 (15) and right face 1 (16) are parallel, left face 1 (15) is perpendicular to front face 1 (11), and left face 1 (15) is also perpendicular to top face 1 (13).
6. The beam splitting prism assembly of a dual optical ranging imaging optical system according to claim 5, wherein: Prism 2 (2) also includes front face 2 (21), left side face 2 (25), right side face 2 (26) and bottom face 2 (23). Front face 2 (21), left side face 2 (25), right side face 2 (26) and bottom face 2 (23) are all planes. Front face 2 (21) is parallel to back face 2 (24). Left side face 2 (25) is parallel to right side face 2 (26). Front face 2 (21) is perpendicular to right side face 2 (26). Bottom face 2 (23) is perpendicular to front face 2 (21), back face 2 (24), left side face 2 (25) and right side face 2 (26).
7. The beam splitting prism assembly of a dual optical ranging imaging optical system according to claim 6, wherein: The front surface one (11) is flush with the front surface two (21), the back surface one (14) is flush with the back surface two (24), the left side surface one (15) is flush with the left side surface two (25), and the right side surface one (16) is flush with the right side surface two (26), so that the entire spectroscopic prism assembly forms a cuboid shape.