Compound prism module and image acquisition module

1. A compound prism module, comprising:

a first prism, comprising a first light-incident surface, a first reflecting surface, and a first light-emergent surface connected to each other, wherein the first light-incident surface and the first light-emergent surface are connected to each other on a first side edge;

a second prism, comprising a second light-incident surface, a second reflecting surface, and a second light-emergent surface connected to each other, wherein the second light-incident surface and the second light-emergent surface are connected to each other on a second side edge, and

the first prism and the second prism are integrally formed, the first light-incident surface and the second light-incident surface are connected to each other and are coplanar, the first reflecting surface and the second reflecting surface are connected to each other on a third side edge, there is a spacing between the third side edge and a connection between the first light-incident surface and the second light-incident surface, and the first side edge and the second side edge are parallel to each other and far away from each other;

a prism holder, comprising a bottom surface and a first inclined side surface and a second inclined side surface extending from two opposite side edges of the bottom surface, wherein the second reflecting surface is fixed to the second inclined side surface, and the first reflecting surface is fixed to the first inclined side surface; and

a lens holder, comprising a bottom plate and a vertical plate, wherein the vertical plate vertically extends from the bottom plate, the vertical plate is disposed on the bottom surface of the prism holder, to cause the first inclined side surface and the second inclined side surface to be perpendicular to the bottom plate, the first prism and the second prism are disposed on the bottom plate, to cause the first light-incident surface and the second light-incident surface to be perpendicular to the bottom plate, and the first reflecting surface and the second reflecting surface are combined with the prism holder.

2. The compound prism module according to claim 1 , wherein

the first reflecting surface and the second reflecting surface are provided with reflective coatings to strengthen the reflection effect.

3. The compound prism module according to claim 1 , wherein

there is a first angle between the first light-incident surface and the first reflecting surface, there is a second angle between the second light-incident surface and the second reflecting surface, there is a third angle between the first reflecting surface and the second reflecting surface, and a sum of the first angle, the second angle, and the third angle is 180 degrees.

4. The compound prism module according to claim 1 , wherein

the third angle between the first reflecting surface and the second reflecting surface is equal to an angle between the first inclined side surface and the second inclined side surface.

5. The compound prism module according to claim 1 , wherein the first inclined side surface and the second inclined side surface are provided with reflective coatings.

6. The compound prism module according to claim 1 , wherein

a rigidity coefficient of the prism holder is greater than rigidity coefficients of the first prism and the second prism.

7. The compound prism module according to claim 6 , wherein

the prism holder is a reflecting prism made of glass, and the first prism and the second prism are plastic prisms.

8. An image acquisition module, comprising:

the compound prism module according to claim 1 ; and

two image cameras, directly or indirectly fixed to the first prism and the second prism, and respectively facing the first light-emergent surface and the second light-emergent surface to acquire images.

9. The compound prism module according to claim 8 , wherein the first reflecting surface and the second reflecting surface are provided with reflective coatings.

10. The compound prism module according to claim 8 , wherein

there is a first angle between the first light-incident surface and the first reflecting surface, there is a second angle between the second light-incident surface and the second reflecting surface, there is a third angle between the first reflecting surface and the second reflecting surface, and a sum of the first angle, the second angle, and the third angle is 180 degrees.

11. The compound prism module according to claim 8 , wherein

the third angle between the first reflecting surface and the second reflecting surface is equal to an angle between the first inclined side surface and the second inclined side surface.

12. The compound prism module according to claim 8 , wherein the first inclined side surface and the second inclined side surface are provided with reflective coatings.

13. The compound prism module according to claim 8 , wherein

a rigidity coefficient of the prism holder is greater than rigidity coefficients of the first prism and the second prism.

14. The compound prism module according to claim 13 , wherein

the prism holder is a reflecting prism made of glass, and the first prism and the second prism are plastic prisms.

15. An image acquisition module, comprising:

the compound prism module according to claim 1 ; and

two image cameras, fixed to the lens holder, and respectively facing the first light-emergent surface and the second light-emergent surface to acquire images.

16. The image acquisition module according to claim 15 , wherein the lens holder further comprises two holders extending from the bottom plate and respectively corresponding to the first light-emergent surface and the second light-emergent surface, and the two image cameras are respectively fixed to the holders.