TWI777868B - Focal length measuring device with different media on both sides of concave lens - Google Patents

Abstract

The invention includes a light source, a convex lens structure and a central moving component. The light source emits a first light beam toward the convex lens structure, which has a first diameter; the first light beam passes through the convex lens structure and becomes a second light beam to irradiate to the central moving component. The central moving component has a front concave lens part and a rear light-transmitting wall part, and is filled with a second medium. The second light beam passes through the front concave lens portion and becomes a third light beam, and then passes through the second medium and the rear light-transmitting wall portion and then irradiates the rear moving element. Adjusting the position of the central moving element can make the third light beam have a second light beam. The diameter of parallel light is focused on a second focal point in the second medium. There is a first focal length between the convex lens structure and the second focal point, and a second focal length between the front concave lens part and the second focal point. This case also has the advantages of being able to measure the focal length when the two sides of the concave lens are different media, and can detect that the third beam is indeed parallel light.

Description

Focal length measuring device with different media on both sides of concave lens

The present invention relates to a focal length measuring device with different media on both sides of a concave lens, especially a concave lens that can measure the focal length when the two sides of the concave lens are different media, and can detect that the third beam is indeed parallel light. The side is the focal length measuring device of different media.

Traditionally, the measurement of the focal length of a concave lens is generally carried out in the same medium, for example, in air.

When the concave lens is applied to a frog lens (myopia lens) or contact lens, since the optical properties of the concave lens are measured in the air, if the user wears the myopia lens in sea water, tap water in swimming pools, or rivers At the junction of the sea (such as the mouth of a freshwater river), the refractive index of the light of the myopic frog mirror may be different, so that the actual correctable myopia may be slightly different. Even seawater at different locations may have different refractive indices of light due to differences in salinity.

Therefore, for two sides of a concave lens under different media (for example, air on one side and sea water on the other side), what is the change in its optical properties (such as focal length)? How to measure? These are all areas that the industry needs to develop and overcome.

In view of this, it is necessary to develop a technology that can solve the above-mentioned conventional shortcomings.

The purpose of the present invention is to provide a focal length measuring device with different media on both sides of the concave lens, which has the advantages of being able to measure the focal length when the two sides of the concave lens are different media, and can detect that the third beam is indeed parallel light and so on. . In particular, the problem to be solved by the present invention is for two of a concave lens Under different media (for example, air on one side and sea water on the other side), how to measure its optical properties (such as focal length) and so on.

The technical means to solve the above problem is to provide a focal length measuring device with different media on both sides of a concave lens. The device part includes: a base; The virtual optical axis emits a first beam, the first beam is parallel light, and the cross-sectional diameter of the first beam is defined as a first diameter; a convex lens structure is arranged on the base, the Both the virtual optical axis and the first light beam pass through the center of the convex lens structure; a central moving component is set on the base, and the central moving component includes a first moving part and a liquid-receiving part; the first moving part The moving part is arranged on the base along the virtual optical axis, and when the liquid-receiving part is arranged on the first moving part, it can move relative to the first moving part along the virtual optical axis; the liquid-receiving part can move relative to the first moving part along the virtual optical axis; The part has a bottom part, a front concave lens part, a rear light-transmitting wall part and two side wall parts, a liquid-receiving space is surrounded therebetween; a rear-end moving component is set on the base, and the rear-end part is The moving component includes a second moving part, a rear moving seat part, a light-transmitting part and an image capturing part; the second moving part is arranged on the base along the virtual optical axis, when the rear end When the moving seat is arranged on the second moving portion, it can move relative to the second moving portion along the virtual optical axis, and the light-transmitting portion and the image capturing portion are both arranged at the rear end along the virtual optical axis on the moving seat; and a control component electrically connected to the light source, the central moving component and the rear moving component; thereby, when the central moving component is not installed on the base, the first light beam It passes through the convex lens structure and becomes a second light beam. The second light beam is convergent light and irradiates toward a first medium and focuses on a first focus; and when the central moving component and the rear moving component are installed on the base, and the liquid-receiving space accommodates a second medium, the second beam passes through the front concave lens portion and becomes a first light beam The three light beams pass through the second medium, the rear light-transmitting wall portion and the light-transmitting portion successively, and then radiate out. The control component controls the image capturing portion to capture a working image toward the light-transmitting portion. The working image has a circular bright area, and the control element controls the relative movement of the liquid-receiving part and the first moving part to adjust the working image so that the third beam is focused on a second medium in the second medium. When the second focus is on, the rear end movable seat and the second movable part can be controlled to move relative to each other through the control element. When it is confirmed that the diameter of the circular bright area remains unchanged, it means that the third light beam is indeed parallel light. The cross-sectional diameter of the third light beam is defined as a second diameter, and there is a first focal length between the center point of the convex lens structure and the second focal point, and the distance between the center point of the front concave lens portion and the second focal point There is a second focal length in between.

The above objects and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of the following selected embodiments.

Hereinafter, the present invention will be described in detail with the following examples and accompanying drawings:

10: Pedestal

20: Light source

21: Light-emitting part

22: Light source convex lens part

30: Convex lens structure

40: Central mobile component

41: The first mobile department

42: Liquid receiving part

421: Bottom

422: Front concave lens part

423: Rear light-transmitting wall

424: Side Wall

42A: Bottom groove

42B: Side slot

50: Backend Mobile Components

51: Second moving part

52: Rear end moving seat

53: Translucent part

54: Image Capture Department

541: Working Image

54A: Circular bright area

54B: Dark Zone

60: Control Components

X: virtual optical axis

S: liquid-bearing space

L: Beam

L1: First beam

L2: Second beam

L3: Third beam

U1: First focus

U2: Second focus

W1: first medium

W2: Second medium

M1: lens holder

M2: concave lens

D ₁ : first diameter

D ₂ : Second diameter

f ₁ : first focal length

f ₂ : second focal length

Q: The center of the circle

R: radius

Figure 1 is a schematic diagram of the present invention

Fig. 2 is a schematic diagram of one of the focal length measurement processes of the present invention

Fig. 3 is a schematic diagram of the second focal length measurement process of the present invention

FIG. 4 is a schematic diagram of the third focal length measurement process of the present invention.

FIG. 5 is a schematic diagram of the fourth focal length measurement process of the present invention.

Fig. 6 is a schematic diagram of a part of the structure of the present invention

Fig. 7 is a partial cross-sectional view at the position VII-VII of Fig. 6

Fig. 8 is a partial cross-sectional view at the position VIII-VIII of Fig. 6

Fig. 9 is a schematic diagram of the working image of the present invention before processing

Fig. 10 is a schematic diagram of the working image of the present invention after processing

Referring to Figures 1, 2, 3, 4 and 5, the present invention is a focal length measuring device with different media on both sides of a concave lens, comprising:

A base 10 .

A light source 20 is installed on the base 10, the light source 20 is used for emitting a first light beam L1 along a virtual optical axis X, the first light beam L1 is parallel light, and the first light beam L1 The cross-sectional diameter is defined as a first diameter D ₁ .

A convex lens structure 30 is disposed on the base 10 , the virtual optical axis X and the first light beam L1 both pass through the center of the convex lens structure 30 .

A central moving assembly 40 is mounted on the base 10 , and the central moving assembly 40 includes a first moving part 41 and a liquid-receiving part 42 . The first moving portion 41 is disposed on the base 10 along the virtual optical axis X, and when the liquid-receiving portion 42 is disposed on the first moving portion 41, it can be connected to the base 10 along the virtual optical axis X. The first moving part 41 moves relatively. The liquid-receiving portion 42 has a bottom portion 421 , a front concave lens portion 422 , a rear light-transmitting wall portion 423 and two side wall portions 424 , and a liquid-receiving space S is surrounded therebetween.

A rear end moving assembly 50 is mounted on the base 10 , and the rear end moving assembly 50 includes a second moving part 51 , a rear moving seat part 52 , a light-transmitting part 53 and an image capture Take part 54. The second moving portion 51 is disposed on the base 10 along the virtual optical axis X. When the rear moving seat portion 52 is disposed on the second moving portion 51, it can be connected to the base 10 along the virtual optical axis X. The second moving portion 51 moves relatively, and the light-transmitting portion 53 and the image capturing portion 54 are both disposed on the rear moving seat portion 52 along the virtual optical axis X.

A control element 60 is electrically connected to the light source 20 , the central moving element 40 and the rear moving element 50 .

Therefore, when the central moving element 40 is not disposed on the base 10 (as shown in FIG. 2 ), the first light beam L1 passes through the convex lens structure 30 to become a second light beam L2 , the second light beam L2 The light beam L2 is convergent and irradiated toward a first medium W1 (eg, air) and focused on a first focus U1 . And when the central moving component 40 and the rear moving component 50 are installed on the base 10, and the liquid-receiving space S accommodates a second medium W2, the second light beam L2 passes through the front concave lens portion 422 and becomes A third light beam L3 passes through the second medium W2, the rear light-transmitting wall portion 423 and the light-transmitting portion 53 successively, and then radiates out. The control component 60 controls the image capturing portion 54 toward the transparent portion. The light part 53 captures a working image 541 (refer to FIG. 9 or 10), the working image 541 has a circular bright area 54A, and then controls the liquid-receiving part 42 and the first movement through the control element 60 The working image 541 is adjusted by the relative movement of the part 41 so that the third light beam L3 is focused on a second focus U2 in the second medium W2 (which is deviated from the first focus U1, and the lines are cluttered, so the first Fig. 4 only shows the second focus U2, the state of the moving position of the liquid-receiving portion 42 is omitted and not shown, and when it is shown first), the rear-end moving seat portion 52 and the second moving seat portion 52 can be controlled through the control component 60. The moving part 51 moves relatively, and when it is confirmed that the diameter of the circular bright area 54A remains unchanged, it means that the third light beam L3 is indeed parallel light, and the cross-sectional diameter of the third light beam L3 is defined as a second diameter D ₂ , there is a first focal length f ₁ between the center point of the convex lens structure 30 and the second focus U2 , and a second focal length f ₂ between the center point of the front concave lens portion 422 and the second focus U2 .

In practice, the light source 20 may include a light emitting portion 21 and a light source convex lens portion 22; the light emitting portion 21 emits a light beam L along the virtual optical axis X toward the light source convex lens portion 22, and the light beam L passes through the light source convex lens After the portion 22 , it becomes the first light beam L1 and irradiates toward the convex lens structure 30 .

Referring to FIGS. 6 , 7 and 8 , the front concave lens portion 422 may include a lens holder M1 and a concave lens M2 .

The bottom portion 421 corresponds to the lens holder M1 and has a bottom groove 42A.

Each of the two side wall portions 424 corresponds to the lens holder M1 and has a side groove 42B.

Therefore, the bottom groove 42A and the two side grooves 42B are used for the insertion and installation of the front concave lens portion 422 .

Of course, the relevant anti-seepage or anti-leakage design can be directly fixed by apron or silicone (the next time it needs to be replaced, it can be removed. This is a skill that has been practiced in the industry for many years, so I won't go into details). It is a well-known technique that can be achieved, and will not be described in detail.

In addition, both the first moving part 41 and the second moving part 51 can be known commercially available linear slide rail assemblies, rails and linear movement control elements, . . . , or other devices capable of controlling movement in a linear direction. .

The light-transmitting portion 53 can be at least one of a frosted glass structure and a related light-transmitting plate structure.

Regarding the actual measurement process in this case, it can be divided into the following two states:

[a] Both sides of the concave lens are in the same medium state: refer to Fig. 2, it is a concave lens (the concave lens in Fig. 2 is omitted and not shown, please refer to the front concave lens portion 422 in Figs. In the case where both sides are both air (that is, the first medium W1), the light-emitting portion 21 is controlled by the control component 60 to emit the light beam L along the virtual optical axis X toward the light source convex lens portion 22 ( In the first medium W1 (that is, in the air), after passing through the light source convex lens portion 22 , the light beam L becomes the parallel light L1 and radiates toward the convex lens structure 30 . The first light beam L1 passes through the convex lens structure 30 to become a second light beam L2, and the second light beam L2 also irradiates the first medium W1 (air) (actually should pass through the The front concave lens portion 422 (not shown) is focused on the first focus U1 (the first focus U1 may be shifted in position due to different media in subsequent measurement of other media, but at least refer to).

[b] The two sides of the concave lens are in different medium states: refer to Figures 1, 3, 4 and 5, through the control element 60 to control the light-emitting portion 21 to emit the light beam toward the light-source convex lens portion 22 along the virtual optical axis X L (in the air), after the light beam L passes through the light source convex lens portion 22, it becomes the first light beam L1 and radiates toward the convex lens structure 30; the first light beam L1 passes through the convex lens structure 30 and becomes the second light beam L1 The light beam L2, the second light beam L2 passes through the front concave lens portion 422 and then becomes the third light beam L3, and then sequentially passes through the second medium W2 (eg, seawater at a certain location) and the rear light-transmitting wall portion 423 to illuminate When reaching the transparent portion 53 , the control component 60 can control the image capturing portion 54 to capture the working image 541 toward the transparent portion 53 , and the working image 541 has a circular bright area 54A.

The point is that after adding a different medium (ie, the second medium W2 ), the original focus position (ie, the first focus U1 ) may shift.

At this time, it is necessary to repeatedly control the relative movement of the liquid-receiving part 42 and the first moving part 41 to the front and back (the lines are tangled, only the second focus U2 is shown in Figure 4, and the state of the moving position of the liquid-receiving part 42 is omitted. (not shown, shown together), when moving forward or backward to different positions, the third light beam L3 may converge or diverge, and it is necessary to keep trying to find a certain position at last. , the third light beam L3 is focused on a second focus U2 in the second medium W2. At this time, the rear-end moving seat portion 52 and the second moving portion 51 can be further controlled to move relative to each other through the control element 60. When it is confirmed that the diameter of the circular bright area 54A remains unchanged, it means that the third light beam L3 is indeed a parallel light. when it stops moving. At this time, the cross-sectional diameter of the third light beam L3 is defined as the second diameter D ₂ , the center point of the convex lens structure 30 and the second focus U2 have a first focal length f ₁ , and the front concave lens portion has a first focal length f 1 . There is a second focal length f ₂ between the center point of 422 and the second focal point U2.

For ease of understanding, the following data are given for trial calculation:

[a] Known part:

The cross-sectional diameter of the first light beam L1 is defined as the first diameter D ₁ =10 cm.

When the size (diameter) of the circular bright area 54A is adjusted to remain unchanged, the diameter of the circular bright area 54A is equal to the cross-sectional diameter of the third light beam L3 = the second diameter D ₂ =5 cm.

The distance between the convex lens structure 30 and the front concave lens portion 422 is 15 cm.

[b] Unknown part:

The first focal length f ₁ and the second focal length f ₂ are unknown.

The distance between the convex lens structure 30 and the front concave lens portion 422 is equal to 15 cm, which is equal to the value of the first focal length f ₁ minus the second focal length f ₂ , so the second focal length f ₂ = the first focal length f ₁ -15 cm .

；10f ₁-150=5f ₁；5f ₁=150；f ₁=30。 where, M =efficiency (unitless); D1 ₌ first diameter; D2 =first diameter; f1 ₌ first focal length _; and f2 = _second focal length; then

; 10 f ₁ -150=5 f ₁ ; 5 f ₁ =150; f ₁ =30.

Therefore, f ₁ =30 cm can be solved.

Further, the second moving portion 51 and the rear moving seat portion 52 are controlled to move relative to each other, and it can be repeatedly confirmed whether the diameter of the circular bright area 54A remains the same. If so, it means that the third light beam L3 is indeed parallel. Light.

Also, referring to FIG. 9 , regarding the calculation of the diameter of the circular bright area 54A of the working image 541 , for example, the control component 60 can perform image processing on the working image 541 . For example, the circular bright area 54A (the periphery of which is a dark area 54B) is first presented by binarization or a similar known image processing method, and the maximum distance in the horizontal direction of the circular bright area 54A can be measured, That is, the diameter of the circular bright area 54A can be measured, which is equal to the second diameter D ₂ of the third light beam L3.

Alternatively, the working image 541 is subjected to (conventional) image processing, that is, edge thinning (after processing, as shown in FIG. 10 ), and the second diameter D ₂ of the third light beam L3 can also be as shown in FIG. 10 . Show, use image processing to obtain curve (circle) fitting, and then use the least square method to convert a series of edge coordinate points into a circle equation, obtain a circle center Q and the second diameter ( D ₂ =2*R), Also another method.

By analogy, different media (liquids), such as the second focus U2 of tap water in an indoor swimming pool, can be measured and substituted into the formula for calculation.

The advantages and effects of the present invention can be summarized as follows:

[1] It is very special to perform focal length measurement when the two sides of the concave lens are different media. The present invention provides the central moving assembly and the rear moving assembly. The liquid-receiving part can be filled with a second medium, so that the two sides of the front concave lens part (the outer side contacts the first medium, usually air, and the inner side contacts the second medium, such as water) are different media, and the center is controlled When the moving element moves along the virtual optical axis, the second focal length can be obtained by indirect confirmation through the rear moving element, and the related data can be further calculated according to the formula. Therefore, it is very special to perform focal length measurement when the two sides of the concave lens are different media.

[2] It can be detected that the third light beam is indeed parallel light. By controlling the relative movement of the second moving part and the rear moving seat, it can be repeatedly confirmed whether the diameter of the circular bright area remains the same, and if so, it means that the third light beam is indeed parallel light. Therefore, it can be detected that the third light beam is indeed parallel light.

The above is only to describe the present invention in detail by means of preferred embodiments, and any simple modifications and changes made to the embodiments do not depart from the spirit and scope of the present invention.

10: Pedestal

20: Light source

21: Light-emitting part

22: Light source convex lens part

30: Convex lens structure

40: Central mobile component

41: The first mobile department

42: Liquid receiving part

421: Bottom

422: Front concave lens part

423: Rear light-transmitting wall

424: Side Wall

50: Backend Mobile Components

51: Second moving part

52: Rear end moving seat

53: Translucent part

54: Image Capture Department

60: Control Components

X: virtual optical axis

S: liquid-bearing space

L: Beam

L1: First beam

L2: Second beam

M1: lens holder

M2: concave lens

Claims (3)

A focal length measuring device with different media on both sides of a concave lens, comprising: a base; a light source, which is arranged on the base, the light source is used for emitting a first light beam along a virtual optical axis, the The first light beam is parallel light, and the cross-sectional diameter of the first light beam is defined as a first diameter; a convex lens structure is arranged on the base, and the virtual optical axis and the first light beam pass through The center of the convex lens structure; a central moving component is arranged on the base, the central moving component includes a first moving part and a liquid-receiving part; the first moving part is arranged on the virtual optical axis along the virtual optical axis on the base, and when the liquid-receiving part is arranged on the first moving part, it can move relative to the first moving part along the virtual optical axis; the liquid-receiving part has a bottom, a front concave lens part, A rear light-transmitting wall portion and two side wall portions enclose a liquid-receiving space therebetween; a rear-end moving component is mounted on the base, and the rear-end moving component includes a second moving portion, a a rear moving seat part, a transparent part and an image capturing part; the second moving part is arranged on the base along the virtual optical axis, when the rear moving seat part is arranged on the second moving part During the time, the system can move relative to the second moving part along the virtual optical axis, the light transmitting part and the image capturing part are both arranged on the rear moving seat part along the virtual optical axis; and a control component, which The light source, the central moving element and the rear moving element are electrically connected; thereby, when the central moving element is not arranged on the base, the first light beam passes through the convex lens structure and becomes a second light beam light beam, the second light beam is convergent light and irradiates toward a first medium and focuses on a first focus; When a second medium is accommodated in the space, the second light beam passes through the front concave lens portion and becomes a third light beam, and then passes through the second medium, the rear light-transmitting wall portion and the light-transmitting portion successively, and then irradiates out. , the control component controls the image capture portion to capture a working image toward the light-transmitting portion, the working image has a circular bright area, and then controls the liquid-receiving portion to be opposite to the first moving portion through the control component The working image is adjusted by moving and adjusted until the third light beam is focused on a second focus in the second medium, and the rear end moving seat and the second moving part can be controlled to move relative to each other through the control component. When it is confirmed that the diameter of the circular bright area remains unchanged, it means that the third beam is indeed parallel light, and the cross-sectional diameter of the third beam is defined as a second diameter. There is a first focal length between the focal points, and a second focal length between the center point of the front concave lens portion and the second focal point. The focal length measuring device with different media on both sides of the concave lens according to claim 1, wherein: the light source comprises a light-emitting part and a light-source convex lens part; the light-emitting part emits light along the virtual optical axis toward the light-source convex lens part A light beam, after passing through the convex lens part of the light source, becomes the first light beam and radiates toward the convex lens structure. The focal length measuring device with different media on both sides of the concave lens according to claim 1, wherein: the front concave lens part comprises a lens holder and a concave lens; the bottom part corresponds to the lens holder and has a bottom groove; and the Each of the two side wall portions corresponds to the lens holder and has a side groove; thus, the bottom groove and the two side grooves are used for the front concave lens portion to be inserted and installed.

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