CN205561770U - Lens thickness detection device - Google Patents

Abstract

The utility model discloses a lens thickness detection device. Lens thickness detection device, including base, detecting head, treat test table, detector, the detecting head with treat that test table installs on the base, treat that test table locates the detecting head under, the detector is connected to the detecting head, the detecting head includes the light source, the detecting head top is located to the light source, the base includes focus adjusting device, focus adjusting device connects the detecting head. The light source is through detecting head focus and with on the lens that awaits measuring of light struck on treating test table, and the parameter of the refraction reverberation through the inspection mirror piece is calculated and true fixed mirror piece thickness.

Description

Lens thickness detection device

Technical field

This utility model relates to field of optical detection, detects device particularly to lens thickness.

Background technology

In optical field, the detection of lens has a significance determining optical effect, and the center thickness of lens Measurement is the most important thing therein, the strictest to the required precision of lens for the field such as photo-etching machine objective lens, camera space.

The method of existing measurement lens center thickness includes contact type measurement and non-contact measurement two kinds.

Contact type measurement, generally uses micrometer or amesdial is measured.When measuring lens, center thickness is often very difficult to Aligning central point, speed is very slow, and is easy for damageeing lens during measuring, and causes lens unavailable.

And contactless measurement, conventional includes image measurement method, coplanar capacitance method, the confocal method of white light and interferometric method Deng, however as more and more higher to the requirement of the aspects such as degree of accuracy, anti-interference and efficiency in industry now, these methods are all deposited In defect, it is impossible to entirely reach requirement.

Utility model content

The purpose of this utility model is to provide a kind of strong interference immunity, the lens thickness detection device that detection efficiency is high.

For achieving the above object, this utility model adopts the following technical scheme that, lens thickness detection device, including pedestal, Detecting head, treat scaffold tower, detector, detecting head and treat that scaffold tower is arranged on pedestal, treat that scaffold tower is located at immediately below detecting head, detecting head Connecting detector, detector includes that light source, light source are located at above detecting head, and pedestal includes focal length adjustment device, and focus adjustment fills Put connection detecting head.Light source is focused on by detecting head and is radiated at by light on the eyeglass to be measured treating on scaffold tower, by detection eyeglass Refraction reflection light parameter, lens thickness is calculated and determined.

In some embodiments, detecting head connects light source and detector by optical fiber.Light source and inspection is connected by optical fiber Survey device, facilitate light transmit, speed soon, anti-interference by force.

In some embodiments, treating that scaffold tower is provided with mobile station, described mobile station connects treats scaffold tower and pedestal.Movement is set Platform, facilitates regulation to treat scaffold tower position, with detecting head centring.

In some embodiments, focal length adjustment device is ball-screw.Use ball-screw, by the rotatory force of nut, Be converted to the locomotivity of upper and lower straight line, regulation detecting head and the distance treating scaffold tower, complete the adjustment of focal length.

In some embodiments, mobile station includes the vertical adjusting screw rod of both direction and adjusting nut, adjusting screw rod Coordinate with adjusting nut.The adjusting screw rod vertical by both direction and the cooperation of adjusting nut, complete the shifting of mobile station XY axle Dynamic adjustment, mobile station drives and treats scaffold tower so that eyeglass to be measured and detecting head complete central campus pair.

In some embodiments, detector connects client, and client is computer or mobile phone.By detector with computer even Connect, analyzed by computer data, imaging and result of calculation.

The beneficial effects of the utility model are: this utility model lens thickness detection device, anti-to lens by detecting head Penetrate light detection, accurately measure lens thickness, and there is strong anti-interference ability.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model lens thickness detection device；

Fig. 2 is the thickness measure principle schematic of this utility model planoconcave lens；

Fig. 3 is that the spectral wavelength that this utility model client shows analyzes schematic diagram.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is described in further detail.

Embodiment 1

As it is shown in figure 1, lens thickness detection device, pedestal 1, detecting head 2, treat scaffold tower 3, detector 4, detecting head 2 and treating Scaffold tower 3 is arranged on pedestal 1, treats that scaffold tower 3 is located at immediately below detecting head 2, and detecting head 2 connects detector 4, and detector 4 includes light Source 41, pedestal 1 includes that focal length adjustment device 11, focal length adjustment device 11 connect detecting head 2.

Detecting head 2 connects light source 41 and detector 4 by optical fiber.Light source 41 uses LED white light modulation.

Treating that scaffold tower 3 is provided with mobile station 31, mobile station 31 connects treats scaffold tower 3 and pedestal 1.Mobile station 31, convenient regulation are set Treat scaffold tower 3 position, with detecting head 2 centring.

Focal length adjustment device 11 is ball-screw.Use ball-screw, by the rotatory force of nut, be converted to upper and lower straight line Locomotivity, regulation detecting head 2 and the distance treating scaffold tower 3, complete the adjustment of focal length.

Mobile station 31 includes that the vertical adjusting screw rod of both direction and adjusting nut, adjusting screw rod and adjusting nut coordinate. The adjusting screw rod vertical by both direction and the cooperation of adjusting nut, complete the mobile adjustment of mobile station 31XY axle, mobile station Scaffold tower 3 is treated in 31 drives so that eyeglass to be measured and detecting head 2 complete central campus pair.

Light source focuses on and is radiated at by light by detecting head 2 on the eyeglass to be measured treating on scaffold tower 3, by detecting the folding of eyeglass Penetrate the parameter of reflection light, lens thickness is calculated and determined.Thickness equations is derived as follows:

Fig. 2, in 3, the radius of curvature of convex surface is R, and thickness is D, obtains the existing peak value of wavelength X 1 and λ 2 through test at spectrum, Respectively two bundle auto-collimation light in corresponding diagram, wherein corresponding first auto-collimation of λ 1, λ 2 after first face refraction to second Individual face realizes auto-collimation, has following derivation according to the geometric triangulation relation formed in the law of refraction and figure.

In triangle OAB, the law of sines is utilized to have:

$\frac{OB}{sin\∠OAB}=\frac{OA}{{\mathrm{sin\θ}}_2}\⇒\∠OAB=\arcsin \left(\frac{OB}{OA}{\mathrm{sin\θ}}_2\right)=\arcsin \left(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2\right)---\left(1\right)$

Wavelength X 2 angle of incidence and ∠ OAB are complementary, so having:

$a=\mathrm{\π}-\∠OAB=\mathrm{\π}-arcsin\left(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2\right)---\left(2\right)$

Can release according to triangle relation simple in the law of refraction and figure:

${\mathrm{\θ}}_4=a-b=a-arcsin\frac{\sin a}{n\left({\mathrm{\λ}}_2\right)}---\left(3\right)$

θ 5=a-θ 2, θ 3=θ 2-θ 4

In triangle OAB, have

$AB=\frac{{\mathrm{sin\θ}}_5\·R}{{\mathrm{sin\θ}}_2}=\frac{\sin (a-{\mathrm{\θ}}_2)\·R}{{\mathrm{sin\θ}}_2}---\left(4\right)$

In triangle ABC, the law of sines is utilized to have:

$BC=\frac{AB\·{\mathrm{sin\θ}}_4}{{\mathrm{sin\θ}}_3}---\left(5\right)$

So the thickness of part to be measured is: (substituting into formula 1,2,3,4,5 in the lump)

$\begin{array}{c}D=D_0+BC=D_0+\frac{\frac{\sin (a-{\mathrm{\θ}}_2)\·R}{{\mathrm{sin\θ}}_2}\×\sin (a-\arcsin (\frac{\sin a}{n\left({\mathrm{\λ}}_2\right)}))}{\sin ({\mathrm{\θ}}_2-a+\arcsin (\frac{\sin a}{n\left({\mathrm{\λ}}_2\right)}))}\\ =D_0+\frac{\frac{\sin \[\arcsin \left(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2\right)-{\mathrm{\θ}}_2\]\·R}{{\mathrm{sin\θ}}_2}\×\sin \[\arcsin (\frac{R+D_0}{R}{\mathrm{sin\θ}}_2-\arcsin (\frac{\sin \left(\arcsin \right(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2))}{n\left({\mathrm{\λ}}_2\right)})\]}{\sin \[{\mathrm{\θ}}_2-\arcsin \left(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2\right)+\arcsin \left(\frac{\sin (\mathrm{\π}-\arcsin (\frac{R+D_0}{R}{\mathrm{sin\θ}}_2))}{n\left({\mathrm{\λ}}_2\right)}\right)\]}\\ =D_0+R\frac{\frac{\sin \[\arcsin \left(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2\right)-{\mathrm{\θ}}_2\]}{{\mathrm{sin\θ}}_2}\×\sin \[\arcsin \left(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2\right)-\arcsin \left(\frac{R+D_0}{R\×n\left({\mathrm{\λ}}_2\right)}{\mathrm{sin\θ}}_2\right)\]}{\sin \[{\mathrm{\θ}}_2-\arcsin \left(\frac{R+D_0}{R}{\mathrm{sin\θ}}_2\right)+\arcsin (\frac{R+D_0}{R\×n\left({\mathrm{\λ}}_2\right)}{\mathrm{sin\θ}}_2\]}\end{array}$

It can be seen that the thickness of part to be measured and four amounts are relevant in formula, it is θ 2, R and D0 respectively and treats photometry Glass refractive index at wavelength X 2.Wherein, θ 2 and D0 is relevant with the design of detecting head 2, can from the curve of spectrum obtained, λ 1 and λ 2 at corresponding peak wavelength determines；R is the curvature (needing known) of part to be measured；N (λ 2) can look into existing material Storehouse obtains.Therefore, can be obtained the geometric thickness of part to be measured by above computing, these computings can pass through detector 4 connect computer, and calculate in computer.

Embodiment 2

As it is shown in figure 1, lens thickness detection device, pedestal 1, detecting head 2, treat scaffold tower 3, detector 4, detecting head 2 and treating Scaffold tower 3 is arranged on pedestal 1, treats that scaffold tower 3 is located at immediately below detecting head 2, and detecting head 2 connects detector 4, and detector 4 includes light Source 41, pedestal 1 includes that focal length adjustment device 11, focal length adjustment device 11 connect detecting head 2.

Detecting head 2 connects light source 41 and detector 4 by optical fiber.Light source 41 uses xenon lamp.

Treating that scaffold tower 3 is provided with mobile station 31, mobile station 31 connects treats scaffold tower 3 and pedestal 1.Mobile station 31, convenient regulation are set Treat scaffold tower 3 position, with detecting head 2 centring.

Focal length adjustment device 11 is ball-screw.Use ball-screw, by the rotatory force of nut, be converted to upper and lower straight line Locomotivity, regulation detecting head 2 and the distance treating scaffold tower 3, complete the adjustment of focal length.

Mobile station 31 includes that the vertical adjusting screw rod of both direction and adjusting nut, adjusting screw rod and adjusting nut coordinate. The adjusting screw rod vertical by both direction and the cooperation of adjusting nut, complete the mobile adjustment of mobile station 31XY axle, mobile station Scaffold tower 3 is treated in 31 drives so that eyeglass to be measured and detecting head 2 complete central campus pair.

Detected 2 white light sources sent of eyeglass irradiate, and reflection light is respectively the distance measurement signals on two surfaces.Root According to the optical characteristics of testee, the physical thickness numerical value of sample just can be obtained.Owing to using optical signal, the result of measurement Do not affected by testee mechanical vibration or environment.Thickness measure uses white light as light source, and therefore tested sample must be able to Penetrated by white light.Have the probe (maximum 45 degree) of big acceptance angle, it is possible to maybe can not be with measurement when probe on coarse surface Face is measured in the case of keeping vertically.

This utility model lens thickness detection device, it is also possible to the eyeglass after detection plated film, uses optical diffraction method to examine respectively Survey the lens thickness after plated film and the lens thickness of naked eyeglass, by calculating the thickness that can obtain thin film.

Above-described is only embodiments more of the present utility model.For the person of ordinary skill of the art, On the premise of creating design without departing from this utility model, it is also possible to making some deformation and improvement, these broadly fall into this practicality Novel protection domain.

Claims (7)

1. lens thickness detection device, it is characterised in that include pedestal (1), detecting head (2), treat scaffold tower (3), detector (4), Described detecting head (2) and treat that scaffold tower (3) is arranged on pedestal (1), described in treat that scaffold tower (3) is located at immediately below detecting head (2), described Detecting head (2) connects detector (4), and described detector (4) includes light source (41), and described light source (41) connects detection by optical fiber Head (2), described pedestal (1) includes focal length adjustment device (11), and described focal length adjustment device (11) connects detecting head (2).

Lens thickness the most according to claim 1 detection device, it is characterised in that described detecting head (2) is by optical fiber even Connect light source (41) and detector (4).

Lens thickness the most according to claim 1 detection device, it is characterised in that described in treat that scaffold tower (3) is provided with mobile station (31), scaffold tower (3) and pedestal (1) are treated in described mobile station (31) connection.

Lens thickness the most according to claim 1 detection device, it is characterised in that described focal length adjustment device (11) is rolling Ballscrew.

Lens thickness the most according to claim 3 detection device, it is characterised in that described mobile station (31) includes two sides Coordinate to vertical adjusting screw rod and adjusting nut, described adjusting screw rod and adjusting nut.

Lens thickness the most according to claim 1 detection device, it is characterised in that described detector (4) connects client, Described client is computer or mobile phone.

Lens thickness the most according to claim 1 detection device, it is characterised in that described light source (41) is white light, light source (41) it is halogen, xenon or LED.