Automatic focusing lens structure

Abstract

The utility model relates to the technical field of projector lenses, in particular to an automatic focusing lens structure, which is fixedly mounted on a projection light machine and comprises a lens frame, a motor is fixedly arranged on the projection light machine, two bumps are fixedly connected onto the lens frame, an output end of the motor is fixedly connected with a driving gear, and the projection light machine is fixedly connected with the driving gear. A rotating rod is fixedly arranged at one end of the connecting block, and a matching groove is formed in the other end; the matching groove is connected with the driving gear in a matched mode, a cam structure is fixedly arranged on the rotating rod, and the cam structure is rotationally installed between the two protruding blocks. According to the automatic focusing lens structure, in the focusing process of an actual projection light machine, the motor needs to drive the rotating rod to rotate continuously, the cam structure is used for promoting the protruding block to move, the driven lens moves forwards and backwards smoothly, the focusing and focusing accuracy is high, focusing is accurate, a complex structure in the lens is omitted, and the cost is reduced. Focusing operation is completed through simple single-motor driving, manual adjustment is not needed, and the focusing process is simple and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of projector lenses, in particular to an automatic focusing lens structure. Background Art

[0002] The focus of existing projector lenses mostly adopts a structure with optical coupling limiter, which has many software and hardware problems in actual use, poor accuracy during use, and the structure is easily damaged.

[0003] In the prior art, the name disclosed in the application number: CN202122032184.8 is: a lens transmission structure and a projector lens focusing device, which includes an optical lens, a transmission turntable and a transmission ring, the rotating axis of the transmission turntable is perpendicular to the rotating axis of the transmission ring, and the transmission ring is arranged outside the optical lens; one side of the transmission turntable is provided with a plurality of cylinders evenly distributed along its circumference, and one end of the transmission ring is provided with a plurality of semicircular grooves evenly distributed along its circumference; the transmission turntable and the transmission ring are transmission connected by the matching of the cylinders and the semicircular grooves.

[0004] However, the lens focusing device mentioned in the prior art has a relatively complex structure. Under actual focusing drive, the driving process of the focusing device has poor stability, and the adjustment operation cannot be cyclically operated. The focusing operation is difficult to control, and focusing errors are prone to occur during actual use. Therefore, it is necessary to design an automatic focusing lens structure. Utility Model Content

[0005] The utility model aims to provide an automatic focusing lens structure to solve the problems in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] An autofocus lens structure, the lens structure is fixedly mounted on a projection optical machine, the lens structure comprises a lens frame, a motor is fixedly arranged on the projection optical machine, two protrusions are fixedly connected to the lens frame, a driving gear for driving a rotating rod is fixedly connected to the output end of the motor, a rotating rod is fixedly arranged at one end of the connecting block, and a matching groove is arranged at the other end;

[0008] The matching groove is matched and connected with the driving gear. A cam structure for driving the lens frame to focus is fixedly arranged on the rotating rod. The cam structure is rotatably installed between the two protrusions.

[0009] Furthermore, a lens cover is fixedly connected to one end of the projection optical machine, a dust cover is fixedly provided on the lens cover, an axial hole is provided at one end of the dust cover, connecting rods are symmetrically fixed to the lens cover, and connecting grooves are symmetrically provided at one end of the dust cover.

[0010] Furthermore, fixing plates are symmetrically fixed to both sides of the dust cover, bolts pass through the fixing plates and are connected to the projection optical machine, and a positioning block is symmetrically fixed to one end of the dust cover, and the connecting rod is fixedly connected to the positioning block.

[0011] Furthermore, a lens 1 is fixedly connected in the lens frame, a mounting ring is abutted on one side of the lens 1, a clamping plate is fixedly provided on one side of the mounting ring, and a lens 2 is clamped in the clamping plate.

[0012] Furthermore, a locking ring is fixedly provided on one side of the lens two, the locking ring is threadedly connected to the lens frame, and the lens three is fixedly provided inside the locking ring, and the lens one, the lens two, and the lens three are coaxially arranged.

[0013] Furthermore, the lens frame is slidably installed in the lens cover, a mounting ear is symmetrically fixed on one side of the motor, a bolt passes through the mounting ear and is connected to the connecting groove, a connecting block is rotatably provided in the dust cover, a connecting shaft is fixed at one end of the rotating rod, and the connecting shaft is rotatably connected to the shaft hole.

[0014] Beneficial effects of the utility model:

[0015] 1. The automatic focus lens structure of the utility model needs to use a motor to drive the rotating rod to rotate continuously during the actual focusing process of the projection optical machine, and use the cam structure to move the protrusion to move the lens smoothly forward and backward. The focusing accuracy is high and the focusing is accurate. The complex structure in the lens is omitted, and a simple single motor drive is used to complete the focusing operation;

[0016] 2. The utility model has an automatic focus lens structure, and the focusing operation process is located inside the dust cover. The structure is simple, the operation is stable, and the error during the operation is small. The lens focusing is automatically completed without manual adjustment. The focusing process is simple and efficient, and is suitable for the focusing function of the projector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the projection optical machine of the utility model;

[0019] Figure 2 It is a schematic diagram of the lens structure of the utility model;

[0020] Figure 3 It is a cross-sectional schematic diagram of the lens structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the cam structure of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the rotating rod of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] An autofocus lens structure, such as Figure 1 As shown, the lens structure is fixedly mounted on the projection light machine 1, one end of the projection light machine 1 is fixedly connected to a lens cover 11, the lens structure includes a lens frame 3, the lens frame 3 is arranged in the lens cover 11, a dust cover 12 is fixedly provided on the lens cover 11, an axial hole 13 is opened at one end of the dust cover 12, and a motor 2 is fixedly provided at the other end, and the motor 2 is fixedly mounted on the top cover of the projection light machine 1.

[0025] The lens cover 11 is fixedly connected with symmetrically distributed connecting rods 14 , and the connecting rods 14 are used to fix the dust cover 12 .

[0026] like Figure 2-5 As shown, one end of the dust cover 12 is provided with symmetrically distributed connecting grooves 15, and symmetrically distributed fixing plates 16 are fixedly provided on both sides of the dust cover 12. Bolts pass through the fixing plates 16 and are fixedly connected to the projection optical machine 1. One end of the dust cover 12 is fixedly provided with symmetrically distributed positioning blocks 17, and the connecting rod 14 passes through the positioning blocks 17 and is fixedly connected to the positioning blocks 17.

[0027] A lens 1 31 is fixedly provided in the lens frame 3, a mounting ring 30 is abutted on one side of the lens 1 31, a clamping plate 35 is fixedly provided on one side of the mounting ring 30, a lens 2 32 is clamped in the clamping plate 35, a locking ring is fixedly provided on one side of the lens 2 32, the locking ring is threadedly connected to the lens frame 3, and a lens 3 33 is fixedly provided in the locking ring, and the lens 1 31, the lens 2 32, and the lens 3 33 are coaxially arranged.

[0028] Two protrusions 34 are fixedly connected to the lens frame 3, and the lens frame 3 is slidably installed in the lens cover 11. One side of the motor 2 is fixedly provided with symmetrically distributed mounting ears 20, which are fixedly connected to the connecting groove 15 through bolts passing through the mounting ears 20. The output end of the motor 2 is fixedly connected with a driving gear 26, and a connecting block 22 is rotatably provided in the dust cover 12. A rotating rod 23 is fixedly provided at one end of the connecting block 22, and a matching groove 27 is opened at the other end.

[0029] The matching groove 27 is fixedly connected with the driving gear 26. A connecting shaft 24 is fixedly arranged at one end of the rotating rod 23. The connecting shaft 24 is rotatably connected with the shaft hole 13. The motor 2 drives the rotating rod 23 to rotate. A cam structure 25 is fixedly arranged on the rotating rod 23. The cam structure 25 rotates and is located between two protrusions 34. The protrusions 34 limit the two sides of the circular cam structure 25. When the motor 2 drives the cam structure 25 to rotate, the protrusions 34 are driven to slide relatively along the arc-shaped side surfaces of the cam structure 25. The cam structure 25 controls the protrusions 34 to move forward and backward, and then drives the lens frame 3 and each lens therein to translate, thereby adjusting the focus function of the projection optical machine.

[0030] Here’s how it works:

[0031] After all the lenses are installed in the lens frame 3, the lens frame 3 is then installed in the lens cover 11, and the motor 2 is fixedly installed on the top of the projection optical machine 1. The rotating rod 23 is further fixedly connected to the output end of the motor 2, and the cam structure 25 is inserted between the two protrusions 34. The assembly is simple and convenient, the assembly error is small, the production cost is low, and the equipment efficiency is high.

[0032] Driven by the motor 2, the cam structure 25 is driven to rotate by the driving gear 26, and then the lens frame 3 is driven to move in an infinite cycle in the lens cover 11, thereby realizing the imaging focus function of the projector. The two protrusions 34 on the lens frame 3 always maintain a uniform and reasonable gap, ensuring that the projector has a good focusing effect during use, a small focusing error, good driving stability, and a stable adjustment effect.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An auto-focus lens structure, the lens structure is fixedly mounted on a projection optical machine (1), characterized in that: The auto-focus lens structure comprises a lens frame (3), a motor (2) is fixedly provided on the projection optical machine (1), two protrusions (34) are fixedly connected to the lens frame (3), a driving gear (26) for driving a rotating rod (23) is fixedly connected to the output end of the motor (2), the rotating rod (23) is fixedly provided at one end of the connecting block (22), and a matching groove (27) is provided at the other end; The matching groove (27) is matched and connected with the driving gear (26); a cam structure (25) for driving the lens frame (3) to focus is fixedly provided on the rotating rod (23); the cam structure (25) is rotatably mounted between the two protrusions (34).

2. The auto-focus lens structure according to claim 1, characterized in that: A lens cover (11) is fixedly connected to one end of the projection optical machine (1), a dust cover (12) is fixedly provided on the lens cover (11), an axial hole (13) is provided at one end of the dust cover (12), a connecting rod (14) is symmetrically fixedly connected to the lens cover (11), and a connecting groove (15) is symmetrically provided at one end of the dust cover (12).

3. The auto-focus lens structure according to claim 2, characterized in that: The two sides of the dust cover (12) are symmetrically fixed with fixing plates (16), bolts pass through the fixing plates (16) and are connected to the projection optical machine (1), one end of the dust cover (12) is symmetrically fixed with a positioning block (17), and the connecting rod (14) is fixedly connected to the positioning block (17).

4. The auto-focus lens structure according to claim 1, characterized in that: The lens frame (3) is fixedly provided with a lens 1 (31), one side of the lens 1 (31) is in contact with a mounting ring (30), one side of the mounting ring (30) is fixedly provided with a clamping plate (35), and the clamping plate (35) is clamped with a lens 2 (32).

5. The auto-focus lens structure according to claim 4, characterized in that: A locking ring is fixedly provided on one side of the second lens (32), the locking ring is threadedly connected to the lens frame (3), and a third lens (33) is fixedly provided inside the locking ring. The first lens (31), the second lens (32), and the third lens (33) are coaxially arranged.

6. The auto-focus lens structure according to claim 2, characterized in that: The lens frame (3) is slidably mounted in the lens cover (11); a mounting ear (20) is symmetrically fixedly connected to one side of the motor (2); a bolt passes through the mounting ear (20) and is connected to the connecting groove (15); a connecting block (22) is rotatably arranged in the dust cover (12); a connecting shaft (24) is fixedly arranged at one end of the rotating rod (23); and the connecting shaft (24) is rotatably connected to the shaft hole (13).

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