Laser scanning field lens

Abstract

The utility model belongs to the technical field of field lenses, and particularly relates to a laser scanning field lens, which comprises a lens barrel, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens are sequentially arranged on the lens barrel along the irradiation direction of light beams, a plurality of rubber rings are fixedly arranged in the lens barrel, and a focal plane is arranged on the side edge of the lens barrel. According to the utility model, the plurality of lenses are arranged in the lens cone in sequence, the lenses are arranged in the mounting grooves in the inner wall of the lens cone, and the lenses are fixed in the lens cone through the rubber rings, so that the lenses cannot rotate or move, the focal length is prevented from changing, and the forming position of a light beam is prevented from being influenced; the concave-convex lens in the middle can be protected under the condition that the incident angle and the emergent angle of a light beam are not changed, and finally, the incident light beam is focused on one light spot through the three concave surfaces and the four convex surfaces according to the thickness and the distance of each lens.

Description

Technical Field

[0001] The utility model relates to the technical field of field lenses, in particular to a laser scanning field lens. Background Art

[0002] Laser scanning field lens, also known as laser scanning focusing lens or flat field focusing lens, is a professional lens system. Its main function is to change the position of the imaging beam without changing the optical properties of the optical system. Especially in laser marking machines, it is used to form a focused spot of uniform size in the entire marking plane.

[0003] Specifically, the function of the laser scanning field lens is to focus the incident light beam on a light spot so that the focal length does not change with the deflection angle. When the galvanometer scans, the light is incident on the field lens at an angle. Without a professional field lens, the focus cannot be maintained at the same light spot or plane, and the laser marking machine cannot work properly. The change in light angle is affected by the position and thickness of the concave and convex lens, so the lens cannot move or be damaged when using the field lens.

[0004] In order to solve the above problems, a laser scanning field mirror is proposed in the present application. Utility Model Content

[0005] To solve the above technical problems, the utility model provides a laser scanning field lens, comprising a lens barrel, on which a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens are sequentially arranged along the irradiation direction of the light beam, a plurality of rubber rings are fixedly arranged in the lens barrel, a focal plane is arranged on the side of the lens barrel, the thicknesses of both ends of the second lens, the third lens, the fourth lens and the fifth lens are equal, the thickness of the first lens is greater than the thickness of the seventh lens, the distance from the first lens to the center of the second lens is less than the distance from the second lens to the center of the third lens, the distance from the third lens to the center of the fourth lens is equal to the distance from the fourth lens to the center of the fifth lens, the distance from the fifth lens to the center of the sixth lens is equal to the distance from the sixth lens to the center of the seventh lens, and the first lens, the seventh lens and the focal plane are in a parallel state.

[0006] Preferably, the first lens is a biplane lens, the second lens is a biconcave lens, the third lens is a single concave lens, the fourth lens is a single convex lens, the fifth lens is a biconvex lens, the sixth lens is a single convex lens, and the seventh lens is a biplane lens.

[0007] Preferably, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the rubber ring are all fixedly connected inside the lens barrel.

[0008] Preferably, the inner wall of the lens barrel is provided with seven mounting grooves, and the rubber ring is fixedly arranged between the inner walls of the lens barrel mounting grooves and the two sides of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens.

[0009] The above technical solution of the utility model has the following beneficial technical effects:

[0010] The utility model arranges a plurality of lenses arranged in sequence in a lens barrel, installs the lenses in installation grooves on the inner wall of the lens barrel, and fixes the lenses in the lens barrel with rubber rings, so that the lenses will not rotate or move, and the focal length will not change, which will affect the forming position of the light beam. At the same time, double-plane lenses are arranged on the front and back surfaces, so that the concave-convex lens in the middle can be protected without changing the incident and emission angles of the light beam. Finally, through the thickness and spacing of each lens, three concave surfaces and four convex surfaces are used to focus the incident light beam on a light spot, so that the focal length will not change with the deflection angle, thereby ensuring the normal operation of the laser marking machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 3 This is a schematic diagram of the light beam irradiation structure at different angles of the utility model;

[0014] Figure 4 It is a schematic diagram of the enlarged structure of point A of the utility model.

[0015] Reference numerals:

[0016] 1. Lens barrel; 101. First lens; 102. Second lens; 103. Third lens; 104. Fourth lens; 105. Fifth lens; 106. Sixth lens; 107. Seventh lens; 2. Rubber ring; 3. Focal plane. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0018] It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention.

[0019] A laser scanning field lens provided by some embodiments of the utility model is described below in conjunction with the accompanying drawings.

[0020] Embodiment 1:

[0021] Combination Figure 1-4 As shown, a laser scanning field lens provided by the utility model comprises a lens barrel 1, on which a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106 and a seventh lens 107 are arranged in sequence along the irradiation direction of the light beam, a plurality of rubber rings 2 are fixedly arranged in the lens barrel 1, a focal plane 3 is arranged on the side of the lens barrel 1, the first lens 101 is a double-plane lens, the second lens 102 is a double-concave lens, the third lens 103 is a single-concave lens, the fourth lens 104 is a single-convex lens, the fifth lens 105 is a double-convex lens, the sixth lens 106 is a single-convex lens, and the seventh lens 107 is a double-plane lens, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107 and the rubber ring 2 are all fixedly connected inside the lens barrel 1, and the lens barrel The inner wall of the lens barrel 1 is provided with seven mounting grooves, the rubber ring 2 is fixedly arranged between the two sides of the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106 and the seventh lens 107 and the inner wall of the mounting groove of the lens barrel 1, the thickness of both ends of the second lens 102, the third lens 103, the fourth lens 104 and the fifth lens 105 are equal, the thickness of the first lens 101 is greater than the thickness of the seventh lens 107, the distance from the first lens 101 to the center of the second lens 102 is less than the distance from the second lens 102 to the center of the third lens 103, the distance from the third lens 103 to the center of the fourth lens 104 is equal to the distance from the fourth lens 104 to the center of the fifth lens 105, the distance from the fifth lens 105 to the center of the sixth lens 106 is equal to the distance from the sixth lens 106 to the center of the seventh lens 107, and the first lens 101, the seventh lens 107 and the focal plane 3 are in a parallel state.

[0022] Specifically, seven mounting grooves are provided in the lens barrel 1, in which a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106 and a seventh lens 107 are installed at the same time, and a rubber ring 2 is fixedly installed between each lens and the mounting groove of the lens barrel 1, so that the connection between each lens and the lens barrel 1 is more tightly connected, and the fixing ability is strengthened, so that the lens inside the lens barrel 1 will not rotate or move when in use, so as to avoid affecting the forming position of the light beam, and a focal plane 3 parallel to the first lens 101 and the seventh lens 107 is provided on the side of the lens barrel 1, and the first lens 101 and the seventh lens 107 are double-plane lenses, so that the incident and emission directions of the light beam will not be affected by the first lens 101 and the seventh lens 107, and at the same time, the first lens 101 and the seventh lens 107 are ... 101 and the seventh lens 107, and at the same time, the first lens 101 and the seventh lens 107 are fixedly installed between each lens 101 and the seventh lens Lens 107 can protect the concave-convex lens in the middle. Since the second lens 102 is a double concave lens, the third lens 103 is a single concave lens, the fourth lens 104 is a single convex lens, the fifth lens 105 is a double convex lens, and the sixth lens 106 is a single convex lens, the function of the concave lens is to diffuse the light beam at a certain angle, and the function of the convex lens is to converge the light beam at a certain angle. Therefore, after the light beam passes through the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105 and the sixth lens 106, a light spot of uniform size will be formed on the focal plane 3, thereby achieving the purpose of concentrating the light beam, so that the device changes the position of the imaging light beam without changing the optical characteristics of the optical system, and finally focuses the incident light beam on a light spot, and then uses it together with a scanning system, such as a galvanometer, to achieve high-precision laser processing.

[0023] The working principle and use process of the utility model are as follows: first, each lens and the rubber ring 2 are fixedly installed in the installation groove of the inner wall of the lens barrel 1, and the incident angle of the light beam is changed by the scanning system on the side of the rubber ring 2. The light beam is diffused by a certain angle after passing through the second lens 102 and the third lens 103, and then converged by a certain angle through the fourth lens 104, the fifth lens 105 and the sixth lens 106. Finally, the light beams of different angles will be concentrated on the focal plane 3 to form a light spot. The purpose of changing the position of the light spot is achieved by changing the incident angle of the light beam through the scanning system, thereby realizing high-precision laser processing.

[0024] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A laser scanning field lens, comprising a lens barrel (1), characterized in that: The lens barrel (1) is provided with a first lens (101), a second lens (102), a third lens (103), a fourth lens (104), a fifth lens (105), a sixth lens (106) and a seventh lens (107) in sequence along the light beam irradiation direction; a plurality of rubber rings (2) are fixedly provided inside the lens barrel (1); a focal plane (3) is provided on the side of the lens barrel (1); the thicknesses of the two ends of the second lens (102), the third lens (103), the fourth lens (104) and the fifth lens (105) are equal; the thickness of the first lens (101) is greater than that of the seventh lens (107); 07), the distance from the first lens (101) to the center of the second lens (102) is smaller than the distance from the second lens (102) to the center of the third lens (103), the distance from the third lens (103) to the center of the fourth lens (104) is equal to the distance from the fourth lens (104) to the center of the fifth lens (105), the distance from the fifth lens (105) to the center of the sixth lens (106) is equal to the distance from the sixth lens (106) to the center of the seventh lens (107), and the first lens (101), the seventh lens (107) and the focal plane (3) are in a parallel state.

2. A laser scanning field lens according to claim 1, characterized in that: The first lens (101) is a double-plane lens, the second lens (102) is a double-concave lens, the third lens (103) is a single-concave lens, the fourth lens (104) is a single-convex lens, the fifth lens (105) is a double-convex lens, the sixth lens (106) is a single-convex lens, and the seventh lens (107) is a double-plane lens.

3. The laser scanning field lens according to claim 1, characterized in that: The first lens (101), the second lens (102), the third lens (103), the fourth lens (104), the fifth lens (105), the sixth lens (106), the seventh lens (107) and the rubber ring (2) are all fixedly connected inside the lens barrel (1).

4. The laser scanning field lens according to claim 1, characterized in that: The inner wall of the lens barrel (1) is provided with seven mounting grooves, and the rubber ring (2) is fixedly arranged between the inner walls of the mounting grooves of the lens barrel (1) and the two sides of the first lens (101), the second lens (102), the third lens (103), the fourth lens (104), the fifth lens (105), the sixth lens (106) and the seventh lens (107).

Images