CN213517722U

CN213517722U - Spectrum lens

Info

Publication number: CN213517722U
Application number: CN202022770652.7U
Authority: CN
Inventors: 滕君方; 黄城
Original assignee: Dongguan Ruixing Vision Technology Co ltd
Current assignee: Dongguan Ruixing Vision Technology Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-06-22
Anticipated expiration: 2030-11-25

Abstract

The utility model relates to the technical field of optical measuring blocks, in particular to a spectral lens, which comprises a front lens barrel and a rear lens barrel assembled with the front lens barrel; the front end lens barrel is provided with an interface used for being assembled with an external light source; a plurality of front-end lenses are arranged in the front-end lens barrel; a plurality of rear end lenses are arranged in the rear end lens barrel; light rays emitted from an external light source sequentially pass through the front end lens and the rear end lens and then penetrate out of the rear end lens barrel; the combined focal length of the front lenses is f 1; the combined focal length of the dry back lenses is f 2; and f1>2.5f 2. The utility model discloses light-emitting angle is great.

Description

Spectrum lens

Technical Field

The utility model relates to an optical measurement technical field, concretely relates to spectrum camera lens.

Background

The spectrum confocal measuring method uses light with different wavelengths, and utilizes the principle that the light passes through a measuring head and then generates dispersion and focuses on different axial positions in the optical axis direction, so that the data of the thickness, the height difference and the like of a measured object are calculated in a reverse mode, and one or more distances in the optical axis direction can be measured by one-time measurement. With the continuous development of technical requirements, the spectrum confocal technology is widely used in precise non-contact measurement.

However, the conventional confocal measuring head generally has a relatively small angle and a short working distance.

Disclosure of Invention

An object of the utility model is to overcome above shortcoming, provide a spectral lens, the emergent ray angle is great.

In order to achieve the above purpose, the specific scheme of the utility model is as follows: a spectral lens comprises a front end lens barrel and a rear end lens barrel assembled with the front end lens barrel; the front end lens barrel is provided with an interface for assembling with an external light source system; a plurality of front-end lenses are arranged in the front-end lens barrel; a plurality of rear end lenses are arranged in the rear end lens barrel; light rays emitted from an external light source system sequentially pass through the front end lens and the rear end lens and then penetrate out of the rear end lens barrel; the combined focal length of the front lenses is f 1; the combined focal length of the dry back lenses is f 2; and f1>2.5f 2.

The utility model is further arranged that the combined focal length of a plurality of front end lenses is f1>60 mm; at least one front lens is a negative focal length lens.

The utility model discloses further set up to, an at least slice rear end lens is negative focal length lens.

The utility model discloses further set up to, the quantity of rear end lens is three at least.

The utility model discloses further set up to, at least a slice rear end lens is positive lens, and this rear end lens's refracting index is greater than 1.85.

The utility model is further provided with a plurality of front end lenses comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence along the direction of light emission; the first lens, the second lens, the third lens and the sixth lens are all negative lenses; the fourth lens and the fifth lens are both positive lenses.

The utility model is further provided with that the rear end lenses comprise a seventh lens, an eighth lens and a ninth lens which are arranged in sequence along the direction of the light ray; the eighth lens and the ninth lens are both negative lenses; the seventh lens is a positive lens.

The utility model discloses further set up as, the front end lens and/or the kind of the abbe number material of rear end lens is three at least.

The utility model discloses further set up to, the front end lens cone with the connection can be dismantled to the rear end lens cone.

The utility model has the advantages that: by arranging the front and rear portions, the front portion collimates the light and separates the light of different wavelengths by dispersion of different materials. The rear portion separately magnifies the front portion component and separates different positions on the focused optical axis. The optical design at the rear end enlarges the focusing position of the light so as to achieve the purpose of long working distance. The light exit angle alpha is up to 60 degrees and its working distance L is up to 11 mm.

Drawings

The invention is further described with the aid of the accompanying drawings, in which, however, the embodiments do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived from the following drawings without inventive effort.

FIG. 1 is a light path diagram of the present invention;

wherein: 2. a front end lens barrel; 3. a rear end lens barrel; 4. an interface; 11. a first lens; 12. a second lens; 13. a third lens; 14. a fourth lens; 15. a fifth lens; 16. a sixth lens; 17. a seventh lens; 18. an eighth lens; 19. and a ninth lens.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

As shown in fig. 1, a spectral lens according to the present embodiment includes a front end lens barrel 2 and a rear end lens barrel 3 assembled with the front end lens barrel 2; the front end lens barrel 2 is provided with an interface 4 for assembling with an external light source system; a plurality of front end lenses are arranged in the front end lens barrel 2; a plurality of rear end lenses are arranged in the rear end lens barrel 3; light rays emitted from an external light source system sequentially pass through the front end lens and the rear end lens and then penetrate out of the rear end lens barrel 3; the combined focal length of the front lenses is f 1; the combined focal length of the dry back lenses is f 2; and f1>2.5f 2.

Specifically, the external light source system is provided with an optical fiber for transmitting and receiving the optical fiber, and the front end lens and the rear end lens perform dispersion processing on the emitted light. The light emitted by the external light source system is collimated by the front end lens, converged by the rear end lens, and then passes out of the rear end lens barrel 3 to reach the surface of the object to be measured; the light rays pass through the surface of the object to be measured, are reflected and then enter the spectral lens again, are finally coupled into the optical fiber, and are transmitted to an external processor to judge data such as thickness, height difference and the like of the surface of the object to be measured. By arranging the front and rear portions, the front portion collimates the input light and separates the light of different wavelengths by dispersion of different materials. The rear portion is derived from splitting the light rays from the front portion up and down to separate different positions on the optical axis of the focus. The optical design at the rear end enlarges the focusing position of the light so as to achieve the purpose of long working distance. The light exit angle alpha is up to 60 degrees and its working distance L is up to 11 mm. The emergent light is larger, the working distance is long, and the focused light spot is small.

As shown in fig. 1, in the spectral lens according to this embodiment, the combined focal length of the front end lenses is f1>60 mm; at least one front lens is a negative focal length lens.

The arrangement structure is more compact.

As shown in fig. 1, in the spectral lens according to this embodiment, at least one rear lens is a negative focal length lens.

The setting can shorten the focal length of the rear end of the spectrum confocal measuring head, and the working distance is long.

As shown in fig. 1, in the spectral lens according to this embodiment, the number of the rear end lens is at least three.

The rear end lens needs to have a large light condensation angle, and needs to be provided with a plurality of small spherical aberration lenses which can improve the light condensation angle.

As shown in fig. 1, in the spectral lens of this embodiment, at least one rear lens is a positive lens, and the refractive index of the rear lens is greater than 1.85.

As shown in fig. 1, in the spectral lens according to this embodiment, the front end lenses include a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, and a sixth lens 16, which are sequentially arranged along the direction of light emission; the first lens 11, the second lens 12, the third lens 13 and the sixth lens 16 are all negative lenses; the fourth lens 14 and the fifth lens 15 are both positive lenses.

The lens collimation effect of the setting is better.

As shown in fig. 1, in the spectral lens according to this embodiment, the rear lenses include a seventh lens 17, an eighth lens 18, and a ninth lens 19 sequentially arranged along the direction of light emission; the eighth lens 18 and the ninth lens 19 are both negative lenses; the seventh lens 17 is a positive lens.

The focusing effect of the above arrangement is better.

As shown in fig. 1, in the spectral lens according to this embodiment, the number of types of the abbe materials of the front lens and/or the back lens is at least three. For measuring more accurate data. For improving the measurement accuracy.

As shown in fig. 1, in the spectral lens according to this embodiment, a front lens barrel 2 is detachably connected to a rear lens barrel 3. In particular a threaded connection.

The above is only a preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the protection scope of the present invention.

Claims

1. A spectral lens, characterized by: comprises a front end lens barrel (2) and a rear end lens barrel (3) assembled with the front end lens barrel (2); the front end lens barrel (2) is provided with an interface (4) for assembling with an external light source system;

a plurality of front end lenses are arranged in the front end lens barrel (2); a plurality of rear end lenses are arranged in the rear end lens barrel (3); light rays emitted from the external light source system sequentially pass through the front end lens and the rear end lens and then penetrate out of the rear end lens barrel (3);

the combined focal length of the front lenses is f 1; the combined focal length of the rear lenses is f 2; and f1>2.5f 2.

2. A spectral lens according to claim 1, wherein: the combined focal length of the front lenses is f1>60 mm; at least one front lens is a negative focal length lens.

3. A spectral lens according to claim 1, wherein: at least one rear lens is a negative focal length lens.

4. A spectral lens according to claim 1, wherein: the number of the rear end lens is at least three.

5. A spectral lens according to claim 1, wherein: at least one of the rear lenses is a positive lens, and the refractive index of the rear lens is greater than 1.85.

6. A spectral lens according to claim 1, wherein: the front end lenses comprise a first lens (11), a second lens (12), a third lens (13), a fourth lens (14), a fifth lens (15) and a sixth lens (16) which are sequentially arranged along the direction of light emission; the first lens (11), the second lens (12), the third lens (13) and the sixth lens (16) are all negative lenses; the fourth lens (14) and the fifth lens (15) are both positive lenses.

7. A spectral lens according to claim 1, wherein: the rear end lenses comprise a seventh lens (17), an eighth lens (18) and a ninth lens (19) which are sequentially arranged along the direction of light emission; the eighth lens (18) and the ninth lens (19) are both negative lenses; the seventh lens (17) is a positive lens.

8. A spectral lens according to claim 1, wherein: the front lens and/or the back lens may be made of at least three types of Abbe materials.

9. A spectral lens according to claim 1, wherein: the front end lens cone (2) is detachably connected with the rear end lens cone (3).