A focal length lens for pattern projection

Abstract

This utility model discloses a focal length-free lens for pattern projection, comprising a lens barrel, a lens cover mounted on the outer side of the front end of the lens barrel, a lens assembly mounted on the inner side of the lens barrel, and an isolation gasket assembly mounted on the inner side of the lens assembly. The isolation gasket assembly includes a first gasket, a second gasket mounted in front of the first gasket, a third gasket mounted in front of the second gasket, and a fourth gasket mounted in front of the third gasket. The lens assembly includes a first lens, a second lens mounted in front of the first lens, a third lens mounted in front of the second lens, a fourth lens mounted in front of the third lens, and a fifth lens mounted in front of the fourth lens. This utility model uses multiple lenses to refract the laser beam multiple times, facilitating the maintenance of a parallel state for the projected laser beam while achieving lossless expansion and magnification, and simultaneously maintaining a constant intensity of the laser beam, effectively saving on aperture adjustments and avoiding focus adjustment operations.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, specifically to a focal length-free lens for pattern projection. Background Technology

[0002] When advertising in bars, KTVs, and shops, beam expanders are often used to project images. A beam expander is a lens assembly that can change the diameter and divergence angle of a laser beam. It is an optical system that increases the diameter of the collimated input beam to a larger collimated output beam. Its design is based on a focal-free system, ensuring that light enters and passes through the optical axis of the internal optical elements in a parallel manner, and exits in the same parallel manner, thus ensuring that the entire system is focal-free.

[0003] Existing beam expanders affect the intensity of laser beams during transmission, resulting in reduced pattern quality and requiring apertures to constrain the laser beams. Therefore, they do not meet current requirements. To address this, we propose a focal-free lens for pattern projection. Utility Model Content

[0004] The purpose of this invention is to provide a focal length-free lens for pattern projection, in order to solve the problems mentioned in the background art, where the intensity of the laser beam is affected during the transmission of the laser beam, resulting in a reduction in the quality of the projected pattern, and the need to use an aperture to constrain the laser beam.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a focal length-free lens for pattern projection, comprising a lens barrel, a lens cover installed on the outer side of the front end of the lens barrel, a lens assembly installed on the inner side of the lens barrel, an isolation gasket assembly installed on the inner side of the lens assembly, the isolation gasket assembly comprising a first gasket, a second gasket installed in front of the first gasket, a third gasket installed in front of the second gasket, and a fourth gasket installed in front of the third gasket; The lens assembly includes a first lens, a second lens mounted in front of the first lens, a third lens mounted in front of the second lens, a fourth lens mounted in front of the third lens, and a fifth lens mounted in front of the fourth lens.

[0006] Preferably, the first lens, second lens, third lens, fourth lens and fifth lens are coaxial with the first washer, second washer, third washer and fourth washer and are arranged alternately, the first washer is disposed between the first lens and the second lens, and the first washer, second washer, third washer and fourth washer are all made of hard rubber.

[0007] Preferably, the lens barrel, lens cover, lens assembly, and isolation gasket assembly are coaxial, the front end of the lens barrel is connected to the lens cover by a thread, and the lens assembly and isolation gasket assembly are locked together by the lens barrel and lens cover.

[0008] Preferably, the inner wall of the rear end of the lens barrel is provided with an internal mounting thread, the rear end of the lens barrel is provided with a laser module, the rear end of the lens barrel and the laser module are connected by an internal mounting thread, a first limiting ring is installed at the front end of the internal mounting thread, the lens barrel and the first limiting ring are integrally machined, and the front end face of the first limiting ring is in contact with the surface of the first lens.

[0009] Preferably, a second limiting ring is provided on the inner side of the front end of the lens cover, the lens cover and the second limiting ring are integrally stamped, the rear end face of the second limiting ring is in close contact with the front end face of the fifth lens, the inner wall of the lens cover is provided with an annular sealing groove, the inner side of the annular sealing groove is provided with a sealing ring, and the front end of the lens barrel is connected to the lens cover through the sealing ring.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model alternately places the first lens, second lens, third lens, fourth lens, and fifth lens in the lens assembly and the first washer, second washer, third washer, and fourth washer in the isolation washer assembly inside the lens barrel. The first limiting ring facilitates the limiting of the first lens. The first washer is located between the first lens and the second lens. When the lens barrel and lens cover are locked and installed, the first limiting ring and the second limiting ring can lock and fix the lens assembly and the isolation washer assembly. In this way, the isolation washer assembly keeps the lens assembly tightly installed and prevents the lens assembly from shifting inside the lens barrel. 2. This utility model connects the lens barrel and the lens cover through a sealing ring provided on the inner side of the annular sealing groove, thereby maintaining the inner sealing effect of the lens assembly. When the laser module irradiates the lens barrel with a laser beam, the laser beam passes through the first lens, the second lens, the third lens, the fourth lens and the fifth lens in sequence to expand and amplify the light. Unlike a beam expander, it can ensure that the laser beam is parallel when it is emitted from the fifth lens, and maintain the intensity of the laser beam. This effectively saves the aperture and avoids the need for focal length adjustment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the entire utility model; Figure 3 This is an exploded structural diagram of the entire utility model.

[0012] In the diagram: 1. Lens barrel; 101. First limiting ring; 102. Mounting internal thread; 2. Lens cover; 201. Second limiting ring; 202. Annular sealing groove; 3. Lens assembly; 301. First lens; 302. Second lens; 303. Third lens; 304. Fourth lens; 305. Fifth lens; 4. Isolation gasket assembly; 401. First gasket; 402. Second gasket; 403. Third gasket; 404. Fourth gasket. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0014] Please see Figure 1 and Figure 2 The present invention provides an embodiment of a focal length-free lens for pattern projection, comprising a lens barrel 1, a lens cover 2 mounted on the outer side of the front end of the lens barrel 1, and a lens assembly 3 mounted on the inner side of the lens barrel 1. The lens barrel 1, lens cover 2, lens assembly 3, and isolation gasket assembly 4 are coaxial. The front end of the lens barrel 1 is connected to the lens cover 2 by a thread. The lens assembly 3 and the isolation gasket assembly 4 are locked together by the lens barrel 1 and the lens cover 2, effectively maintaining the stable installation of the lens assembly 3 and the isolation gasket assembly 4.

[0015] Please see Figure 2 and Figure 3 An isolation gasket assembly 4 is installed inside the lens assembly 3. The isolation gasket assembly 4 includes a first gasket 401, a second gasket 402 installed in front of the first gasket 401, a third gasket 403 installed in front of the second gasket 402, and a fourth gasket 404 installed in front of the third gasket 403. The lens assembly 3 includes a first lens 301, a second lens 302 installed in front of the first lens 301, a third lens 303 installed in front of the second lens 302, a fourth lens 304 installed in front of the third lens 303, and a fifth lens 305 installed in front of the fourth lens 304. The laser beam passes through the first lens 301, the second lens 302, the third lens 303, the fourth lens 304, and the fifth lens 305 in sequence to expand and amplify the light. The first lens 301, the second lens 302, the third lens 303, the fourth lens 304, and the fifth lens 305 are coaxial with the first washer 401, the second washer 402, the third washer 403, and the fourth washer 404 and are arranged alternately. The first washer 401 is disposed between the first lens 301 and the second lens 302. The first washer 401, the second washer 402, the third washer 403, and the fourth washer 404 are all made of hard rubber. The isolation washer assembly 4 keeps the lens assembly 3 tightly installed and prevents the lens assembly 3 from shifting inside the lens barrel 1.

[0016] Please see Figure 2 The inner wall of the rear end of the lens barrel 1 is provided with an internal installation thread 102. A first limiting ring 101 is installed at the front end of the internal installation thread 102. The lens barrel 1 and the first limiting ring 101 are integrally machined. The front end face of the first limiting ring 101 is in contact with the surface of the first lens 301. A second limiting ring 201 is provided on the inner side of the front end of the lens cover 2. The lens cover 2 and the second limiting ring 201 are integrally stamped. The rear end face of the second limiting ring 201 is in contact with the front end face of the fifth lens 305. The lens assembly 3 and the isolation gasket assembly 4 can be locked and fixed through the first limiting ring 101 and the second limiting ring 201. The rear end of the lens barrel 1 is equipped with a laser module, and the rear end of the lens barrel 1 is connected to the laser module by an internal thread 102. The inner wall of the lens cover 2 is provided with an annular sealing groove 202, and a sealing ring is provided on the inner side of the annular sealing groove 202. The front end of the lens barrel 1 is connected to the lens cover 2 by the sealing ring. The sealing ring can maintain the sealing effect of the inner side of the lens assembly 3.

[0017] In summary, the first lens 301, second lens 302, third lens 303, fourth lens 304, and fifth lens 305 in the lens assembly 3, and the first gasket 401, second gasket 402, third gasket 403, and fourth gasket 404 in the isolation gasket assembly 4 are alternately placed inside the lens barrel 1. The lens barrel 1 is coaxial with the lens assembly 3 and the isolation gasket assembly 4. A first limiting ring 101 is provided inside the lens barrel 1, which facilitates the adjustment of the first lens 301. The first washer 401 is located between the first lens 301 and the second lens 302 to limit the position. The front end of the lens barrel 1 is connected to the lens cover 2 by threads. A second limiting ring 201 is provided on the inner side of the front end of the lens cover 2. When the lens barrel 1 and the lens cover 2 are locked and installed, the first limiting ring 101 and the second limiting ring 201 can lock and fix the lens assembly 3 and the isolation washer assembly 4. In turn, the isolation washer assembly 4 keeps the lens assembly 3 tightly installed and prevents the lens assembly 3 from shifting inside the lens barrel 1. Meanwhile, the lens barrel 1 and the lens cover 2 are connected by a sealing ring provided on the inner side of the annular sealing groove 202, thereby maintaining the inner sealing effect of the lens assembly 3. A laser module is connected to the rear end of the lens barrel 1 by an internal thread 102. When the laser module irradiates the lens barrel 1 with a laser beam, the laser beam passes through the first lens 301, the second lens 302, the third lens 303, the fourth lens 304 and the fifth lens 305 in sequence to expand and amplify the light. Unlike a beam expander, it can ensure that the laser beam is parallel when it is emitted from the fifth lens 305, and maintain the intensity of the laser beam. This effectively saves the aperture and avoids the need for focal length adjustment.

[0018] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A focal length-free lens for pattern projection, comprising a lens barrel (1), characterized in that: A lens cover (2) is installed on the outer side of the front end of the lens barrel (1), a lens assembly (3) is installed on the inner side of the lens barrel (1), an isolation gasket assembly (4) is installed on the inner side of the lens assembly (3), the isolation gasket assembly (4) includes a first gasket (401), a second gasket (402) is installed in front of the first gasket (401), a third gasket (403) is installed in front of the second gasket (402), and a fourth gasket (404) is installed in front of the third gasket (403). The lens assembly (3) includes a first lens (301), a second lens (302) is mounted in front of the first lens (301), a third lens (303) is mounted in front of the second lens (302), a fourth lens (304) is mounted in front of the third lens (303), and a fifth lens (305) is mounted in front of the fourth lens (304).

2. The focal length-free lens for pattern projection according to claim 1, characterized in that: The first lens (301), the second lens (302), the third lens (303), the fourth lens (304) and the fifth lens (305) are coaxial with the first washer (401), the second washer (402), the third washer (403) and the fourth washer (404) and are arranged alternately. The first washer (401) is disposed between the first lens (301) and the second lens (302). The first washer (401), the second washer (402), the third washer (403) and the fourth washer (404) are all made of hard rubber.

3. The focal length-free lens for pattern projection according to claim 2, characterized in that: The lens barrel (1), lens cover (2), lens assembly (3) and isolation gasket assembly (4) are coaxial. The front end of the lens barrel (1) is connected to the lens cover (2) by a thread. The lens assembly (3) and isolation gasket assembly (4) are locked together by the lens barrel (1) and lens cover (2).

4. The focal length-free lens for pattern projection according to claim 3, characterized in that: The inner wall of the rear end of the lens barrel (1) is provided with an internal mounting thread (102). The rear end of the lens barrel (1) is provided with a laser module. The rear end of the lens barrel (1) is connected to the laser module through the internal mounting thread (102). The front end of the internal mounting thread (102) is provided with a first limiting ring (101). The lens barrel (1) and the first limiting ring (101) are integrally machined. The front end face of the first limiting ring (101) is in contact with the surface of the first lens (301).

5. A focal length-free lens for pattern projection according to claim 4, characterized in that: The inner side of the front end of the lens cover (2) is provided with a second limiting ring (201). The lens cover (2) and the second limiting ring (201) are integrally stamped. The rear end face of the second limiting ring (201) is in close contact with the front end face of the fifth lens (305). The inner wall of the lens cover (2) is provided with an annular sealing groove (202). The inner side of the annular sealing groove (202) is provided with a sealing ring. The front end of the lens barrel (1) is connected to the lens cover (2) through the sealing ring.

Images