CN104062771A - Eccentric adjustment method of optical lens with submicron order control precision - Google Patents

Abstract

The invention proposes an eccentric adjustment method of an optical lens lens with submicron-level control accuracy. In the present invention, the piezoelectric ceramic placed on the piezoelectric ceramic support seat drives the lens eccentricity adjustment nail with sub-micron control accuracy under the control of the applied voltage, and then adjusts the eccentric position of the lens to be adjusted, and at the same time through the rotation of the centering instrument rotary table The eccentric position of the lens to be adjusted can be accurately obtained by the measurement of the rotation and lens surface eccentricity reflection image measurement components, and the optical design analysis software is used until the eccentricity of the lens to be adjusted is adjusted to meet the optimal design requirements, and then glue is injected to completely fix the lens to be adjusted. The invention proposes a new method for accurately adjusting the eccentricity of the optical lens lens driven by piezoelectric ceramics, which can ensure that the adjustment precision of the eccentricity of the lens is controlled at a high level of sub-micron, so that the imaging lens has more superior quality.

Description

Optical lens eccentric adjustment method with sub-micron level control accuracy

technical field

The invention belongs to the technical field of optical instruments, and relates to a method for accurately adjusting the eccentricity between lenses during the assembly process of optical lenses.

Background technique

Optical lens is an essential key component in various optical imaging systems and monitoring systems. The quality of the optical lens directly affects the performance of the imaging system and monitoring system, and even determines the success. Because the optical lens must have various aberration defects in theory, a more complex combination of optical lenses with different shapes and different materials is often used in the design of the optical lens. The purpose is to correct various aberrations of the optical lens in order to obtain high-quality imaging. quality. However, there are still many errors from the completion of the design to the actual manufacture. In the process of actually manufacturing optical lenses, it is inevitable that there will be various parts manufacturing errors, lens assembly errors, and so on. Although the lens, lens barrel, spacer and other parts of the optical lens that affect the imaging quality of the optical system generally have higher tolerance requirements, even so, these residual tolerances will still affect the imaging quality of the entire lens.

Generally, lenses with higher requirements often have one or two eccentrically adjustable lenses or lens groups during structural design. During assembly and production, the eccentric adjustment of one or two eccentrically adjustable lenses or lens groups is used to achieve error correction. The mutual compensation among them makes the imaging quality of the whole lens optimal. The general eccentric adjustment is accomplished by pushing the adjustable lens or lens group through the rotation of the adjusting screw. Since the adjustment screw is a mechanical structure, the adjustment accuracy is generally not high, typically 10 microns or 5 microns. It is difficult to achieve submicron control accuracy.

The quality requirements of modern optical systems are getting higher and higher. For some special high-precision applications, the quality degradation of the optical system caused by a few microns of lens eccentricity is intolerable. Therefore, the precise control and adjustment of lens eccentricity has become a The bottleneck of optical lens manufacturing technology.

Contents of the invention

The present invention proposes a piezoelectric ceramic as a precision moving actuator to precisely adjust the eccentricity of the lens of the optical lens with a precision of sub-micron level, and cooperate with the centering instrument and the optical design computer analysis software to realize the lens in the optical lens The eccentricity is precisely controlled in order to achieve mutual compensation between errors and optimize the imaging quality of the entire lens.

This method uses the lens eccentricity adjustment system. The system consists of a centering instrument rotary table, a lens to be assembled, a piezoelectric ceramic support seat, a piezoelectric ceramic, a lens eccentricity adjustment nail, and a lens surface eccentric reflection image measurement component, which are placed on a piezoelectric ceramic support. Under the control of the applied voltage, the piezoelectric ceramic on the seat drives the lens eccentricity adjustment nail with sub-micron control precision, and then adjusts the eccentric position of the lens to be adjusted. Accurately obtain the eccentric position of the lens to be adjusted, and cooperate with the optical design analysis software until the eccentricity of the lens to be adjusted is adjusted to meet the requirements of the optimal design before injecting glue to completely fix the lens to be adjusted.

During the lens assembly process, the eccentricity of each lens can be measured through this system: rotate the centering instrument rotary table, at this time, the eccentric value of each lens surface can be measured one by one through the lens surface eccentric reflection image measurement component. According to the test eccentricity value of each lens, it is input into optical design software, such as ZEMAX software, etc., and the eccentricity of the lens to be adjusted is used as a variable to optimize the imaging quality of the entire lens and obtain the best eccentricity value of the lens to be adjusted. According to this eccentricity value, by controlling the driving voltage value of the piezoelectric ceramic in this system, the eccentricity adjustment of the mirror to be adjusted is realized. After the eccentricity of the lens to be adjusted is adjusted to meet the requirements of the optimal design, glue is injected through the corresponding injection hole on the lens to completely fix the lens to be adjusted.

The invention proposes a new method for accurately adjusting the eccentricity of the optical lens lens driven by piezoelectric ceramics, which can ensure that the adjustment precision of the eccentricity of the lens is controlled at a high level of sub-micron, so that the imaging lens has more superior quality.

Description of drawings

Fig. 1 is a schematic diagram of the system composition of the eccentric assembly and adjustment method of the optical lens lens with sub-micron level control accuracy of the present invention. In the figure, 1 is the rotating table of the centering instrument; 2 is the lens barrel and lens to be assembled; 3 is the piezoelectric ceramic support seat; 4 is the piezoelectric ceramic; 5 is the adjustment nail; 6 is the center lens to be adjusted; 7 is the eccentric reflection like measurement components.

Fig. 2 is a view along A-A in Fig. 1 .

Figure 3 is a typical piezoelectric ceramic voltage-displacement curve.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

Referring to Figure 1, this optical lens lens eccentricity adjustment system with sub-micron level control precision consists of a centering instrument rotary table 1, a lens to be assembled 2, a piezoelectric ceramic support seat 3, a piezoelectric ceramic 4, and a lens eccentricity adjustment nail 5 1. The lens surface eccentric reflection image measurement component 7 is composed. Among them, the control accuracy is sub-micron movement actuator is piezoelectric ceramics, placed on the piezoelectric ceramic support base, the other end of the piezoelectric ceramics is closely adjacent to the eccentric adjustment nail. The piezoelectric ceramics, the supporting seat and the eccentric adjustment nail each have a total of three parts to form an eccentric adjustment execution structure in one direction. A total of four groups of such eccentric adjustment execution structures are symmetrically installed in four directions of the eccentric lens 6 to be adjusted, as shown in the accompanying drawing 2, there are respectively left, right, upper and lower groups.

The actuator of eccentric movement is piezoelectric ceramics. Piezoelectric ceramics are high-precision micro-displacement devices. The inverse piezoelectric effect of piezoelectric ceramics is used, that is, when a dielectric with piezoelectric properties is placed in an external electric field, due to the action of the electric field, the relative displacement of the positive and negative charge centers inside the medium is caused, resulting in deformation of the medium. It can realize the displacement of microns and tens of microns, and can output a large force at the same time. See Figure 3. Under the control of the applied voltage, the total length of the piezoelectric ceramic can change. When one end of the piezoelectric ceramic is fixed , the other end can realize the displacement of micron and ten microns, and has a displacement accuracy as high as 0.1 micron or even higher.

When the lens to be adjusted needs to move to the right, reduce the piezoelectric ceramic driving voltage of the right group of eccentric adjustment actuators, and the total length of the piezoelectric ceramic will be reduced, so that the adjustment nail and the piezoelectric ceramic will be separated and loosened, and the adjustment nail will lose its treatment. At the same time, increase the piezoelectric ceramic driving voltage of the left group of eccentric adjustment actuator structures. Since the support seat at one end of the piezoelectric ceramic is fixed with the base of the system (rotary table of the centering instrument), the eccentric adjustment nail must be fixed. Moving to the right, the eccentric lens to be adjusted can realize the eccentric movement to the right.

Similarly, the eccentric adjustment of the lens to be adjusted to the left, upward, and downward in any direction can be realized respectively.

The rotating table of the centering instrument and the lens surface eccentric reflection image measurement component in the accompanying drawing 1 actually constitute a centering instrument, and the eccentricity of each lens during the lens assembly process can be measured through this system: the rotating centering instrument The rotating stage, at this time, the eccentric value of each lens surface can be measured one by one through the lens surface eccentric reflection image measurement component. According to the test eccentricity value of each lens, input the eccentricity value together with all optical parameters into the optical design software, such as ZEMAX software, etc., and use the eccentricity of the lens to be adjusted as a variable to optimize the imaging quality of the entire lens and obtain the best to be adjusted The eccentricity value of the lens. According to this eccentricity value, by controlling the driving voltage value of the piezoelectric ceramic in this system, the eccentricity adjustment of the mirror to be adjusted is realized. After the eccentricity of the lens to be adjusted is adjusted to meet the requirements of the optimal design, glue is injected through the corresponding injection hole on the lens to completely fix the lens to be adjusted.

The lens eccentric adjustment method of the present invention uses piezoelectric ceramics with extremely high displacement control precision as an actuator, and can realize lens eccentric adjustment with a stroke of several microns and a precision of sub-micron level. In order to achieve mutual compensation between lens errors, so that the imaging quality of the entire lens can be optimal.

Claims (3)

1. the optical lens eccentricity of glasses lens Method of Adjustment of submicron order control accuracy, it is characterized in that: the method is used eccentricity of glasses lens adjustment System, by centerscope universal stage (1), camera lens to be assembled (2), piezoelectric ceramics supporting seat (3), piezoelectric ceramics (4), eccentricity of glasses lens adjustment nail (5), the eccentric reflection image of lens surface is measured assembly (7) composition, be placed in the control accuracy with sub-micron under piezoelectric ceramics (4) the alive control outside on piezoelectric ceramics supporting seat (3) and drive eccentricity of glasses lens adjustment nail (5), and then adjust the eccentric position of eyeglass to be adjusted (6), the measurement of simultaneously measuring assembly (7) by rotation and the eccentric reflection image of lens surface of centerscope universal stage (1) accurately obtains the eccentric position of eyeglass to be adjusted (6), coordinate optical design analysis software, until wait the offset of adjusting eyeglass (6) adjust to meet optimal design and require after thoroughly fixing eyeglass to be adjusted (6) of injecting glue again.

2. optical lens eccentricity of glasses lens Method of Adjustment according to claim 1, is characterized in that: piezoelectric ceramics (4), supporting seat (3) and eccentric adjust nail (5) each one the bias of a direction of totally three part compositions adjust execution architecture; Totally four groups of symmetries of such bias adjustment execution architecture is arranged on the four direction for the treatment of eccentric eyeglass.

3. optical lens eccentricity of glasses lens Method of Adjustment according to claim 1, it is characterized in that: the eccentricity values of measuring one by one each lens surface by the eccentric reflection image measurement assembly of lens surface (7), according to the test eccentricity values of each eyeglass, eccentricity values is input to together with whole optical parameter to optical design software, using the offset of eyeglass to be adjusted (6) as variable, optimize whole lens imaging quality, obtain the eccentric value of best eyeglass to be adjusted (6), according to this eccentric value, by controlling the driving voltage value of piezoelectric ceramics (4), realize the offset adjustment of eyeglass to be adjusted (6).