Dual-camera co-eucentric adjustable optical axis distance telephoto lens

Abstract

The utility model discloses a kind of dual-camera common object plane adjustable light axis distance telecentric lens, including the optical assembly I being arranged along vertical optical axis I from lower object plane to upper image plane I, light splitting prism, diaphragm I and optical assembly II, the reflection side of light splitting prism is provided with diaphragm II and optical assembly III along horizontal optical axis II: optical assembly I is infinite conjugate distance telecentric objective lens;Optical assembly II is the tube mirror I that can swing left and right around the center of diaphragm I, when the swing angle of tube mirror I is ±θ1, the field of view center of tube mirror I and the point corresponding on object plane of infinite conjugate distance telecentric objective lens are conjugate;Optical assembly III is the tube mirror II that can swing up and down around the center of diaphragm II, when the swing angle of tube mirror II is ±θ2, the field of view center of tube mirror II and the point corresponding on object plane of infinite conjugate distance telecentric objective lens are conjugate;Camera is provided with corresponding each tube mirror, and two cameras can be realized to the object on object plane Two close target objects are photographed, and the distance of two target objects is less than 10mm.

Description

Technical Field

[0001] This utility model relates to optical instrument lenses, specifically a telecentric lens with adjustable optical axis spacing for dual cameras sharing a common object plane. Background Technology

[0002] To capture images of two targets that are on the same plane and close together (generally <10mm) (commonly used in machine vision applications such as positioning and marking), there are two common solutions: one is to use a dual-camera dual-lens system with two sets of secondary reflection prism optical components for imaging; the other is to use a single camera with a large target area and a wide field of view lens for imaging.

[0003] The two solutions described above have the following technical drawbacks:

[0004] For Option 1, since the optical components of the secondary reflection prism have a certain size, and in order to ensure the amount of light entering the lens, the distance between the two optical axes cannot be infinitely close. Generally speaking, the distance between the two optical axes is about 5 mm, which is the limit, and the distance is fixed and cannot be adjusted.

[0005] For Option 2, the cost of large-area cameras and wide-field lenses is extremely high, and the data transmission speed of large-area cameras is relatively slow, which cannot meet the usage requirements in many cases. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention proposes a telecentric lens with adjustable optical axis spacing for dual cameras sharing a common object plane.

[0007] A telecentric lens with adjustable optical axis spacing for dual cameras sharing a common object plane, capable of solving existing technical problems, comprises an optical component I, a beam splitter, an aperture stop I, and an optical component II arranged along a vertical optical axis I from the lower object plane to the upper image plane I. The beam splitter's reflective side is provided with an aperture stop II and an optical component III arranged along a horizontal optical axis II. The difference lies in:

[0008] 1. The optical component I is a telecentric objective lens with infinity conjugate distance.

[0009] 2. The optical component II is a tube mirror I that can swing left and right around the center of the aperture I. When the swing angle of the tube mirror I is ±θ1, the center of the field of view of the tube mirror I is conjugate with the point on the object plane corresponding to the point of the telecentric objective lens at infinity.

[0010] 3. The optical component Ⅲ is a tube mirror Ⅱ that can swing up and down around the center of the aperture Ⅱ. When the swing angle of the tube mirror Ⅱ is ±θ2, the field of view center of the tube mirror Ⅱ is conjugate with the point on the object plane corresponding to the point of the telecentric objective lens at infinity.

[0011] 4. Each tube is equipped with a camera. Two cameras can be used to photograph two close targets on the object surface, with a distance of less than 10mm between the two targets.

[0012] Further settings:

[0013] 1. The optical component I includes a combination lens I, a biconvex lens VI, a meniscus lens and a combination lens II arranged sequentially from bottom to top along the optical axis I. The combination lens I includes a biconcave lens I and a biconvex lens I cemented together. The combination lens II includes a meniscus lens I, a meniscus lens II and a meniscus lens III cemented together.

[0014] 2. The optical component II includes a combination lens III and a combination lens IV arranged from bottom to top along the optical axis I. The combination lens III includes a cemented meniscus lens IV and a biconvex lens II, and the combination lens IV includes a cemented biconvex lens III and a biconcave lens II.

[0015] 3. The optical component Ⅲ includes a combination lens Ⅴ and a combination lens Ⅵ arranged along the optical axis Ⅱ with a 90° bend. A reflector is provided at the bend of the optical axis Ⅱ. The combination lens Ⅴ includes a cemented meniscus lens Ⅴ and a biconvex lens Ⅵ. The combination lens Ⅵ includes a cemented biconvex lens Ⅴ and a biconcave lens Ⅲ.

[0016] Further mechanical structure design is as follows:

[0017] The beam splitter prism, aperture I, and aperture II are disposed within the beam splitter base. The telecentric objective lens with conjugate distance at infinity is mounted at the bottom of the beam splitter base. The tube mirror I is mounted at the top of the beam splitter base via a slide block I. The concave cylindrical surface of the bottom of the slide block I with radius R1 matches the convex cylindrical surface of the top of the beam splitter base with radius R1, thereby enabling the tube mirror I to swing left and right around the center of aperture I. The tube mirror II, composed of a vertical and a horizontal tube, is mounted on the side of the beam splitter base via a slide block II. The concave cylindrical surface of the side of the slide block II with radius R2 matches the convex cylindrical surface of the side of the beam splitter base with radius R2, thereby enabling the tube mirror II to swing up and down around the center of aperture II.

[0018] The beneficial effects of this utility model are:

[0019] The telecentric lens of this invention, with its dual-camera common object plane adjustable optical axis spacing, has a simple structure, good edge field of view imaging quality, small brightness difference between the center and edge fields of view, adjustable optical axis spacing, and is easy to operate. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0021] Figure 2 for Figure 1 Assembly diagram of the implementation method.

[0022] Figure number identifiers: 1. Beam splitter prism; 2. Aperture stop I; 3. Aperture stop II; 4. Telecentric objective lens with conjugate distance at infinity; 5. Tube lens I; 6. Tube lens II; 7. Combined lens I; 7-1. Biconcave lens I; 7-2. Biconvex lens I; 8. Biconvex lens VI; 9. Meniscus lens; 10. Combined lens II; 10-1. Meniscus lens I; 10-2. Meniscus lens II; 10-3. Meniscus lens III; 11. Combined lens III; 11-1. Meniscus lens IV; 11-2. Biconvex lens II; 12. Combined Lens IV; 12-1, Biconvex Lens III; 12-2, Biconcave Lens II; 13, Composite Lens V; 13-1, Meniscus Lens V; 13-2, Biconvex Lens VI; 14, Composite Lens VI; 14-1, Biconvex Lens V; 14-2, Biconcave Lens III; 15, Reflector; 16, Beam Splitter; 17, Object Plane; 18, Image Plane I; 19, Image Plane II; 20, Optical Axis I; 21, Optical Axis II; 22, Lens Barrel Slide I; 23, Lens Barrel Slide II; 24, Guide Pin Assembly I; 25, Guide Pin Assembly II. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the embodiments shown in the accompanying drawings.

[0024] This utility model relates to a dual-camera telecentric lens with adjustable optical axis spacing on a common object plane. It includes an optical component I, a beam splitter 1, an aperture stop I2, and an optical component II, arranged from the lower object plane 17 to the upper image plane I18 along a vertical optical axis I20. The aperture stop I2 is located on the transmission side of the beam splitter 1 (i.e., the aperture stop I2 is located on the upper side of the beam splitter 1). On the reflection side (left side) of the beam splitter 1, along the horizontal optical axis II21, an aperture stop II3 and an optical component III are provided. The optical axis II21 is folded upwards by 90° within the optical component III to the upper image plane II19. Figure 1 As shown.

[0025] Optical component I is an infinity-conjugate telecentric objective lens 4; optical component II is a tube mirror I5 that can swing left and right around the center of aperture I2. When the swing angle of tube mirror I5 is ±θ1, the center of the field of view of tube mirror I5 is conjugate to the corresponding point on the object surface of the infinity-conjugate telecentric objective lens 4; optical component III is a tube mirror II6 that can swing up and down around the center of aperture II3. When the swing angle of tube mirror II6 is ±θ2, the center of the field of view of tube mirror II6 is conjugate to the corresponding point on the object surface of the infinity-conjugate telecentric objective lens 4, that is, the centers of the field of view of optical components II and III coincide with the center of the field of view of optical component I; a camera is provided for each tube mirror, and two cameras can be used to photograph two close targets (distance < 10mm) on the object surface 17, such as... Figure 1 , Figure 2 As shown.

[0026] The optical component I includes, from bottom to top along the optical axis I20, a combination lens I7, a biconvex lens VI8, a meniscus lens 9, and a combination lens II10. The combination lens I7 includes a biconcave lens I7-1 (lower side) and a biconvex lens I7-2 (upper side) cemented together. The combination lens II10 includes meniscus lenses I10-1, II10-2, and III10-3 cemented together from bottom to top. Figure 1 As shown.

[0027] The optical component II includes a combined lens III11 (lower) and a combined lens IV12 (upper) arranged along the optical axis I20. The combined lens III11 includes a cemented meniscus lens IV11-1 (lower) and a biconvex lens II11-2 (upper); the combined lens IV12 includes a cemented biconvex lens III12-1 (lower) and a biconcave lens II12-2 (upper), as shown below. Figure 1 As shown.

[0028] The optical component III includes a combined lens V13 and a combined lens VI14 arranged along the optical axis II21. A reflector 15 is provided at the bend of the optical axis II21. The combined lens V13 is located on the horizontal section of the optical axis II21 and includes a cemented meniscus lens V13-1 (right side) and a biconvex lens VI13-2 (left side). The combined lens VI14 is located on the vertical section of the optical axis II21 and includes a cemented biconvex lens V14-1 (lower side) and a biconcave lens III14-2 (upper side). Figure 1 As shown.

[0029] The optical powers of optical components I, II, and III are all positive; the parameters of combined lenses V13 and VI14 are consistent with those of combined lenses III11 and IV12.

[0030] In the specific assembly structure, the beam splitter 1, aperture I2, and aperture II3 are disposed within the beam splitter base 16. The telecentric objective lens 4 with infinity conjugate distance is mounted at the bottom of the beam splitter base 16. The tube lens I5 is mounted at the top of the beam splitter base 16 via a tube slide I22. The concave cylindrical surface (radius R1) at the bottom of the tube slide I22 mates with the convex cylindrical surface (radius R1) at the top of the beam splitter base 16. The tube lens I5 can be guided and positioned by the guide pin assembly I24. The angle by which mirror I5 swings left and right around the center of aperture I2 is ±θ1; the tube mirror II6 (including a vertical tube and a horizontal tube) is mounted on the left side of the beam splitter 16 via a tube slide II23. The concave cylindrical surface (radius R2) on the right side of the tube slide II23 matches the convex cylindrical surface (radius R2) on the left side of the beam splitter 16. Guided and limited by the guide pin assembly II25, the tube mirror II6 can swing up and down around the center of aperture II3 by an angle of ±θ2. Figure 2As shown.

[0031] The above-described embodiments are merely one specific and detailed embodiment of the present utility model and should not be construed as limiting the scope of protection of the present utility model patent. For those skilled in the art, several modifications and improvements can be made without departing from the spirit of the present utility model, and these all fall within the scope of protection of the present patent.

Claims

1. A telecentric lens with adjustable optical axis spacing for dual cameras sharing a common object plane, comprising an optical component I, a beam splitter (1), an aperture stop I (2), and an optical component II arranged along a vertical optical axis I (20) from the lower object plane (17) to the upper image plane I (18), wherein the beam splitter (1) has an aperture stop II (3) and an optical component III arranged along a horizontal optical axis II (21) on its reflecting side, characterized in that: The optical component I is an infinity conjugate telecentric objective lens (4); The optical component II is a tube mirror I (5) that can swing left and right around the center of the aperture I (2). When the swing angle of the tube mirror I (5) is ±θ1, the center of the field of view of the tube mirror I (5) is conjugate with the point on the object surface corresponding to the telecentric objective lens (4) at infinity. The optical component Ⅲ is a tube mirror Ⅱ (6) that can swing up and down around the center of the aperture Ⅱ (3). When the swing angle of the tube mirror Ⅱ (6) is ±θ2, the center of the field of view of the tube mirror Ⅱ (6) is conjugate with the point on the object surface corresponding to the telecentric objective lens (4) at infinity. Each endoscope is equipped with a camera. Two cameras can be used to photograph two close targets on the object surface, with a distance of less than 10mm between the two targets.

2. The telecentric lens with adjustable optical axis spacing for dual cameras and common object plane as described in claim 1, characterized in that: The optical component I includes a combination lens I (7), a biconvex lens VI (8), a meniscus lens (9) and a combination lens II (10) arranged sequentially from bottom to top along the optical axis I (20). The combination lens I (7) includes a biconcave lens I (7-1) and a biconvex lens I (7-2) cemented together. The combination lens II (10) includes a meniscus lens I (10-1), a meniscus lens II (10-2) and a meniscus lens III (10-3) cemented together. The optical component II includes a combination lens III (11) and a combination lens IV (12) arranged from bottom to top along the optical axis I (20). The combination lens III (11) includes a cemented meniscus lens IV (11-1) and a biconvex lens II (11-2). The combination lens IV (12) includes a cemented biconvex lens III (12-1) and a biconcave lens II (12-2). The optical component Ⅲ includes a combination lens Ⅴ (13) and a combination lens Ⅵ (14) arranged along an optical axis Ⅱ (21) that folds upward at 90°. A reflector (15) is provided at the fold of the optical axis Ⅱ (21). The combination lens Ⅴ (13) includes a cemented meniscus lens Ⅴ (13-1) and a biconvex lens Ⅵ (13-2). The combination lens Ⅵ (14) includes a cemented biconvex lens Ⅴ (14-1) and a biconcave lens Ⅲ (14-2).

3. The dual-camera co-FOV adjustable optical-axis separation telecentric lens according to claim 2, wherein: The beam splitter (1), aperture I (2), and aperture II (3) are disposed within the beam splitter base (16). The telecentric objective lens (4) with infinity conjugate distance is mounted at the bottom of the beam splitter base (16). The tube mirror I (5) is mounted at the top of the beam splitter base (16) via a tube slide I (22). The concave cylindrical surface of the bottom of the tube slide I (22) with radius R1 is adjacent to the convex cylindrical surface of the top of the beam splitter base (16) with radius R1. The tube mirror I (5) is aligned to swing left and right around the center of the aperture I (2); the tube mirror II (6), which is composed of a vertical tube and a horizontal tube, is mounted on the side of the beam splitter (16) through the tube slide II (23). The concave cylindrical surface of the side of the tube slide II (23) with a radius of R2 is aligned with the convex cylindrical surface of the side of the beam splitter (16) with a radius of R2 to realize the tube mirror II (6) swinging up and down around the center of the aperture II (3).

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