CN118192093A - Focusing system - Google Patents

Abstract

The invention relates to a focusing system which is used for carrying out a focusing process on a lens module to be tested. The focusing system comprises a light source, a frame, a first focusing chart and a focusing device. The frame is arranged at one side of the light source. The first focusing diagram is arranged between the light source and the frame. The focusing device is arranged in the frame. The focusing device comprises a fixing element and a second focusing chart. The fixing element clamps the lens of the lens module to be tested. The lens and the first focusing diagram have a first preset distance. The second focusing chart is arranged on the fixing element and has a second preset distance with the lens. The first predetermined distance is greater than the second predetermined distance.

Description

Focusing system

Technical Field

The present disclosure relates to focusing systems, and particularly to a focusing system for a fixed focus lens.

Background

The focusing mode of the lens module is mainly to utilize a clamp or a fixing element to fix the lens module, and then to adjust the relative position of the lens (lens) and an image sensor (image sensor) by a fixing device so as to focus.

When focusing the fixed focus lens module, a designated focusing distance is set according to the requirement of the use situation. For example, the use case is that the distance between the camera and the target is typically 10 cm, and the designated focusing distance is set to be 10 cm. Generally, the main components of a focusing system include a light box, a focusing chart (i.e., a test chart for focusing), and a holding device. Wherein, the focusing chart and the fixing device are both arranged in the light box, and the fixing device clamps the lens to be tested. Before focusing, the focusing diagram is set at a position separated from the lens to be measured by the designated focusing distance (namely 10 cm). During focusing, the lens to be measured can be rotated by the fixing element to adjust the relative position of the lens to be measured and the image sensor until the focusing diagram in the output image is clear (in focus).

However, if the fixed focus lens is focused to a position of 10 cm, the distance from 1.5 cm to infinity can be covered by the reference scene depth table, but only the distance of about 10 cm is clear, and the remaining distance is relatively blurred, not to mention an image with a distance of less than 1.5 cm. Therefore, it is difficult to ensure that the fixed focus lens is clear in both near and far focus images. In other words, if the distant view has been focused to clarity, the close view may still be blurred; conversely, if the close range is in focus, the distant range may still be blurred. Therefore, the focusing method and the focusing system used in the prior art cannot judge whether the images of the focus lens in near-view focusing and far-view focusing can be clear or not, and there is room for improvement.

Disclosure of Invention

In view of the above problems, the present invention provides a focusing system, which includes a first focusing chart and a focusing device, and the first focusing chart and the focusing device include a second focusing chart, so as to solve the problem that the focusing system in the prior art cannot determine whether the images of the lens module to be measured in close-range and far-range can be clear.

In order to achieve the above objective, the present invention provides a focusing system for performing a focusing process on a lens module to be tested. The focusing system comprises a light source, a frame, a first focusing chart and a focusing device. The frame is arranged at one side of the light source. The first focusing diagram is arranged between the light source and the frame. The focusing device is arranged in the frame. The focusing device comprises a fixing element and a second focusing chart. The fixing element clamps the lens of the lens module to be tested. The lens and the first focusing diagram have a first preset distance. The second focusing chart is arranged on the fixing element and has a second preset distance with the lens. The first predetermined distance is greater than the second predetermined distance.

According to an embodiment of the present invention, the first focusing diagram and the second focusing diagram do not overlap.

According to an embodiment of the invention, the holding element comprises a clamping portion and a first supporting portion. The clamping part is positioned at the bottom side of the holding element, and the first supporting part is positioned at the top side of the holding element.

According to an embodiment of the invention, the holding element is funnel-shaped and the outer circumference of the top side of the holding element is larger than the outer circumference of the bottom side.

According to an embodiment of the invention, the clamping part fixes the lens. The focusing device comprises a focusing plate, and the second focusing diagram is formed on the focusing plate. The focusing plate is arranged on the first supporting part.

According to an embodiment of the present invention, the focusing apparatus includes a focusing lens. The focusing lens is arranged on the first supporting part and is positioned above the focusing plate.

According to an embodiment of the present invention, the focusing apparatus includes a focusing lens. The second focusing diagram is formed on the focusing lens, and the focusing lens is arranged on the first supporting part.

According to an embodiment of the invention, the focusing device further includes a cover plate disposed on an upper surface of the holding element.

According to an embodiment of the invention, the cover plate has a hollow portion, and the hollow portion corresponds to the second focusing chart.

According to an embodiment of the invention, the holding element comprises a second support portion, to which the cover plate is fixed.

According to an embodiment of the invention, the second support portion is disposed adjacent to the first support portion, and the second support portion is close to an outer edge of the holding element.

According to an embodiment of the invention, the focusing system further includes a control module electrically connected to the lens module to be tested and receiving the test image. The test image comprises a pattern of the first focusing chart and a pattern of the second focusing chart, and the fixing element drives the lens to move until the first focusing chart and the second focusing chart in the test image reach focusing.

In the foregoing, the focusing system according to the present invention includes a light source, a frame, a first focusing chart and a focusing device. The first focusing diagram is arranged between the light source and the frame. The fixing element of the focusing device clamps the lens of the lens module to be tested, and the focusing device comprises a second focusing diagram. The lens and the first focusing diagram have a first preset distance, the lens and the second focusing diagram have a second preset distance, and the first preset distance is larger than the second preset distance. By means of the structure, the focusing system confirms that the far-view focusing image of the lens module to be tested is clear by using the first focusing diagram, and confirms that the near-view focusing image of the lens module to be tested is clear by using the second focusing diagram. Therefore, the lens module to be tested which is focused by the focusing system can clearly present the images of the appointed close view and distant view.

Drawings

Fig. 1 is a schematic view of a focusing system according to an embodiment of the present invention.

Fig. 2 is an exploded view of the focusing system shown in fig. 1.

Fig. 3 is an enlarged schematic view of the focusing device and the lens module to be tested shown in fig. 1.

Fig. 4 is an exploded view of the focusing device shown in fig. 1.

Fig. 5 is a schematic cross-sectional view of the focusing device and the lens module to be tested shown in fig. 3.

Fig. 6 is a schematic diagram of a test image generated by the focusing system shown in fig. 1.

Fig. 7 is a schematic view of a focusing apparatus according to another embodiment of the present invention.

Description of the reference numerals

Focusing system 1

Light source 10

Frame 20

Topside 21

First focusing chart 30

Focusing device 40, 40a

Holding element 41

Clamping portion 411

First support portion 412

Second support 413

Second focusing charts 42, 42a

Focusing plate 43

Focusing lens 44, 44a

Cover plate 45

Hollow 451

Control module 50

Lens module 9 to be tested

Lens 91

Image sensor 92

Mirror base 93

First predetermined distance D1

A second predetermined distance D2

Detailed Description

In order to better understand the technical content of the present invention, the following description is given by way of specific preferred embodiments.

Fig. 1 is a schematic view of a focusing system according to an embodiment of the present invention, fig. 2 is an exploded view of the focusing system shown in fig. 1, and fig. 3 is an enlarged schematic view of the focusing device and the lens module to be tested shown in fig. 1, fig. 2 and fig. 3. First, the focusing system 1 of the present embodiment is used for performing a focusing process on the lens module 9 to be tested. The lens module 9 to be tested is taken as an example of a fixed focus lens module. In the present embodiment, the focusing system 1 includes a light source 10, a frame 20, a first focus map 30, and a focusing device 40. The frame 20 is disposed at one side of the light source 10, for example, the frame 20 is located under the light source 10. In this embodiment, the light source 10 is a light source board disposed on the top side 21 of the frame 20. In addition, the top side 21 of the frame 20 is made of a transparent material, so that the light emitted by the light source 10 can enter the frame 20.

The first focusing diagram 30 is disposed between the light source 10 and the frame 20. In one embodiment, the first focusing chart 30 may be printed directly on the side of the frame 20 near the light source 10. In an embodiment, the first focusing chart 30 may be printed on a light-transmitting plate, and the light-transmitting plate with the first focusing chart 30 is disposed on a side of the frame 20 near the light source 10, or between the frame 20 and the light source 10. In this embodiment, the first focus pattern 30 is printed on a transparent plastic sheet, and the transparent plastic sheet having the first focus pattern 30 is disposed on the top side 21 of the frame 20. The light source 10 is then placed on the top side 21 of the frame 20 and over the transparent plastic sheet, thereby positioning the first focusing diagram 30 between the light source 10 and the frame 20.

The focusing device 40 is disposed within the frame 20. Fig. 4 is an exploded view of the focusing device shown in fig. 1, and fig. 5 is a cross-sectional view of the focusing device shown in fig. 3 and a lens module to be tested, please refer to fig. 3, fig. 4 and fig. 5. The focusing device 40 includes a holding member 41 and a second focusing chart 42. The holding element 41 holds the lens 91 of the lens module 9 to be tested, so that the lens 91 and the first focusing chart 30 have a first predetermined distance D1 (as shown in fig. 1). The second focusing chart 42 is disposed on the holding element 41 and has a second predetermined distance D2 from the lens 91 (as shown in fig. 5). Note that, since the first focusing chart 30 and the second focusing chart 42 are thin, they are marked on the side lines. Since the holding element 41 holds the lens module 9 to be tested so that the second focusing chart 42 is closer to the lens 91 than the first focusing chart 30, the first predetermined distance D1 is greater than the second predetermined distance D2.

The predetermined distance in this embodiment refers to a predetermined focusing distance. The first focusing chart 30 of the present embodiment is a test chart for long-range focusing, so the first predetermined distance D1 may be a designated focusing distance of the long-range. In addition, the second focusing chart 42 is a test chart for close-up focusing, so the second predetermined distance D2 may be a designated focusing distance of the close-up. For example, if the usage situation of the lens module 9 to be tested is 1 cm to 10 cm away from the target, the specified focusing distance of the distant view can be set to 10 cm, and the specified focusing distance of the close view can be set to 1 cm. In other words, the first predetermined distance D1 may be set to 10 centimeters and the second predetermined distance D2 to 1 centimeter. In the present embodiment, the lens 91 is separated from the first focusing chart 30 on the top side 21 of the frame 20 by 10 cm (i.e. the first predetermined distance D1) by adjusting the height of the frame 20 or the position of the holding element 41. In addition, the second focusing chart 42 is separated from the lens 91 by 1 cm (i.e. the second predetermined distance D2) by the height of the holding element 41 itself or the setting position of the second focusing chart 42.

Specifically, the holding element 41 of the present embodiment includes a clamping portion 411 and a first supporting portion 412, as shown in fig. 4 and 5. The clamping portion 411 is located at the bottom side of the holding element 41, while the first support portion 412 is located at the top side of the clamping portion 411. The clamping portion 411 may be a ring shape having a smaller inner diameter, and the first supporting portion 412 may be a ring-shaped platform having a larger inner diameter. Preferably, the holding element 41 of the present embodiment has a funnel-shaped structure, and the outer circumference of the top side of the holding element 41 is larger than the outer circumference of the bottom side.

The clamping portion 411 fixes the lens 91, for example, the clamping portion 411 is sleeved outside the lens 91, so that the inner wall of the clamping portion 411 clamps and fixes the lens 91. The second focusing chart 42 is disposed on the first supporting portion 412. Specifically, the focusing apparatus 40 of the present embodiment includes a focusing plate 43, and the second focusing chart 42 is formed on the focusing plate 43. The focusing plate 43 is a transparent plastic sheet, and may be a circular transparent plastic sheet. The second focusing chart 42 is formed on the focusing plate 43 in a printing manner, and the focusing plate 43 is disposed on the first supporting portion 412. Therefore, in the present embodiment, the first supporting portion 412 of the holding element 41 and the lens 91 are 1 cm (i.e. the second predetermined distance D2), so that the second focusing chart 42 is 1 cm (i.e. the second predetermined distance D2) from the lens 91.

It should be noted that, the first focusing chart 30 and the second focusing chart 42 may be interlaced with black and transparent color blocks, and the first focusing chart 30 and the second focusing chart 42 in fig. 2 and fig. 4 are only shown in a square shape, and black color blocks are not drawn. In other embodiments, the first focusing chart 30 or the second focusing chart 42 may be densely arranged lines or other patterns suitable for focusing, which is not limited by the present invention.

In the present embodiment, the height (or thickness) of the holding element 41 is designed to be greater than or equal to the second predetermined distance D2, such that the shortest distance between the clamping portion 411 and the first supporting portion 412 is substantially the second predetermined distance D2 (e.g. 1 cm). Therefore, when the lens 91 is fixed by the clamping portion 411, the distance between the lens 91 and the second focusing diagram 42 may be a second predetermined distance D2 (for example, 1 cm).

Preferably, the focusing apparatus 40 further includes a focusing lens 44. The focusing lens 44 is a light transmissive material, which may be, for example, but not limited to, a transparent plastic plate or a glass plate. Preferably, the focusing lens 44 and the focusing plate 43 are circular. The focusing lens 44 is disposed on the first supporting portion 412 and above the focusing plate 43, so as to fix the second focusing chart 42 and the focusing plate 43 to the fixing element 41. In other embodiments, the focusing lens 44 and the focusing plate 43 may have other shapes, and need only be fixed to the holding element 41, which is not limited by the present invention.

Preferably, the focusing device 40 further includes a cover 45 disposed on the top side of the holding element 41. Specifically, the holding element 41 further includes a second support 413, and the second support 413 is disposed adjacent to the first support 412. In this embodiment, the first supporting portion 412 and the second supporting portion 413 are annular platforms, and are stepped due to the difference in size and height. As seen from the center point of the focusing device 40, the second support portion 413 is close to the outer edge and the top side of the holding element 41, and the first support portion 412 is closer to the inner edge and lower than the second support portion 413, as shown in fig. 4 and 5. The cover 45 is provided on the first support portion 412 and is screwed to the second support portion 413. Since the cover 45 is located above the focusing lens 44, the focusing lens 44 can be fixed to the holding element 41.

In the present embodiment, the cover 45 is also in a ring-shaped structure, so the cover 45 has a hollow 451. The hollow portion 451 corresponds to the second focusing chart 42, so as to avoid the cover plate 45 from shielding the second focusing chart 42. When the annular cover 45 is disposed on the second supporting portion 413, the inner edge portion of the cover 45 is located above the first supporting portion 412, so that the inner edge portion of the cover 45 and the outer edge portion of the focusing lens 44 overlap each other, and the focusing lens 44 can be fixed to the fixing element 41. In other embodiments, the cover 45 may be a circular transparent plate, and disposed on the second supporting portion 413.

Preferably, the first focusing chart 30 and the second focusing chart 42 do not overlap, as shown in fig. 2. Specifically, the range of the first focusing chart 30 projected onto the focusing plate 43 does not overlap with the second focusing chart 42. In the present embodiment, the first focusing chart 30 is annular, the second focusing chart 42 is circular, and the second focusing chart 42 corresponds to the hollow portion of the annular first focusing chart 30. Since the first focusing chart 30 and the second focusing chart 42 do not overlap, whether the first focusing chart 30 and the second focusing chart 42 in the test image are clear or not can be checked at the same time, and mutual interference is avoided.

Fig. 6 is a schematic diagram of a test image generated by the focusing system shown in fig. 1, and please refer to fig. 1, fig. 2, fig. 3 and fig. 6. In this embodiment, the focusing system 1 further includes a control module 50 electrically connected to the lens module 9 to be tested, for receiving the test image from the lens module 9 to be tested. The control module 50 is further electrically connected to the display screen to present the test image, as shown in fig. 6. The test image includes a pattern of the first focusing chart 30 and a pattern of the second focusing chart 42. As shown in fig. 5, the lens module 9 to be tested further includes an image sensor 92 and a lens base 93. The image sensor 92 is disposed at the bottom of the lens base 93. The lens 91 is movably connected to the lens holder 93 and corresponds to the image sensor 92. In the focusing process, the lens 91 is driven to move by the holding element 41 of the focusing device 40, so as to adjust the relative distance between the lens 91 and the image sensor 92 until the first focusing chart 30 and the second focusing chart 42 in the test image are in focus (i.e. both represent clear images), as shown in fig. 6. For example, if the lens 91 is connected to the lens holder 93 in a screw-locking manner, the focusing device 40 can be rotated clockwise or counterclockwise, and the lens 91 is driven to rotate by the holding element 41, so as to adjust the distance between the lens 91 and the image sensor 92 until the first focusing chart 30 and the second focusing chart 42 are both clear images. In other words, the focusing system 1 of the present embodiment can confirm that the images of the lens module 9 to be measured in both near and far focuses are clear.

Specifically, when the focusing is completed, the lens module 9 to be measured is separated from the target by 1 cm (i.e. the designated focusing distance of the close range), the distant view part of the lens module 9 to be measured can still clearly present an image (for example, an image of the target or the environment separated from the lens module 9 to be measured by 10 cm). On the contrary, when the focusing is completed and the lens module 9 to be measured is separated from the target by 10 centimeters, the image of the close range (for example, 1 centimeter from the lens module 9 to be measured) can still be clearly presented. In other words, the lens module 9 to be measured focusing by the focusing system 1 of the present embodiment can clearly present (i.e. focus) the images of the designated close range and the designated far range.

In addition, the first focusing diagram 30 is disposed between the light source 10 and the frame 20, and the focusing device 40 has a structure of the second focusing diagram 42 such that a difference between the first predetermined distance D1 and the second predetermined distance D2 may be quite large. Therefore, the focusing system 1 of the present embodiment can be applied to a use situation having both a far view and a near view of a specified focusing distance, and the difference between the far view and the near view of the specified focusing distance can be quite large. For example, the first predetermined distance D1 of the present embodiment may be equal to 10 times the second predetermined distance D2, and the corresponding designated focusing distance of the distant view may be equal to 10 times the designated focusing distance of the close view. In other embodiments, the first predetermined distance D1 may also be greater than 10 times the second predetermined distance D2. The aforementioned 10 times are only examples, and other values may be adjusted according to the use situation.

Fig. 7 is a schematic view of a focusing apparatus according to another embodiment of the present invention, please refer to fig. 7. The focusing device 40a of the present embodiment includes a holding element 41, a second focusing chart 42a, a focusing lens 44a and a cover 45. The retaining element 41 and the cover 45 are the same as in the previous embodiments, so that the reference numerals are used. The difference from the foregoing embodiment is that the second focusing chart 42a of the present embodiment is formed on the focusing lens 44a. For example, the focusing lens 44a may be a glass plate, and the second focusing chart 42a is formed on the focusing lens 44a in an etching manner. In other words, the second focus map 42a may be a pattern (e.g., square) etched on the focus lens 44a. The focusing lens 44a is also circular and is disposed on the first support portion 412 to focus the second chart 42a. Therefore, in this embodiment, the second focusing chart 42a is formed on the focusing lens 44a instead of the focusing plate of the previous embodiment.

In summary, the focusing system according to the present invention includes a light source, a frame, a first focusing chart and a focusing device. The first focusing diagram is arranged between the light source and the frame. The fixing element of the focusing device clamps the lens of the lens module to be tested, and the focusing device comprises a second focusing diagram. The lens and the first focusing diagram have a first preset distance, the lens and the second focusing diagram have a second preset distance, and the first preset distance is larger than the second preset distance. By means of the structure, the focusing system confirms that the far-view focusing image of the lens module to be tested is clear by using the first focusing diagram, and confirms that the near-view focusing image of the lens module to be tested is clear by using the second focusing diagram. Therefore, the lens module to be tested which is focused by the focusing system can clearly present the images of the appointed close view and distant view.

It should be noted that the above-mentioned embodiments are presented for the purpose of illustration and that the scope of the invention as claimed should be defined by the following claims rather than by the foregoing description.

Claims (12)

1. A focusing system is used for carrying out focusing process on a lens module to be tested, and comprises:

A light source;

A frame disposed at one side of the light source;

the first focusing diagram is arranged between the light source and the frame; and

A focusing device disposed in the frame, the focusing device comprising:

the fixing element clamps the lens of the lens module to be tested, and the lens and the first focusing chart have a first preset distance; and

The second focusing chart is arranged on the fixing element and has a second preset distance with the lens, and the first preset distance is larger than the second preset distance.

2. The mirror focusing system of claim 1, wherein the first focusing diagram and the second focusing diagram do not overlap.

3. The focusing system of claim 1, wherein the holding element includes a clamping portion and a first support portion, the clamping portion being located at a bottom side of the holding element, the first support portion being located near a top side of the holding element.

4. A focusing system as recited in claim 3, wherein the holding element is funnel-shaped and an outer circumference of the top side of the holding element is larger than an outer circumference of the bottom side.

5. The focusing system of claim 3, wherein the clamping portion fixes the lens, the focusing device includes a focusing plate, the second focusing chart is formed on the focusing plate, and the focusing plate is disposed on the first supporting portion.

6. The focusing system of claim 5, wherein the focusing device comprises a focusing lens disposed on the first support portion and above the focusing plate.

7. The focusing system according to claim 3, wherein the focusing device includes a focusing lens, the second focusing chart is formed on the focusing lens, and the focusing lens is disposed on the first supporting portion.

8. The focusing system of claim 1, wherein the focusing device further comprises a cover plate disposed on a top side of the holding member.

9. The focusing system of claim 8, wherein the cover plate has a hollow portion corresponding to the second focusing chart.

10. The focusing system of claim 8, wherein the holding member includes a second support portion to which the cover plate is fixed.

11. The focusing system of claim 10, wherein the second support is disposed adjacent to the first support and the second support is proximate to an outer edge of the holding element.

12. The focusing system of claim 1, further comprising:

The control module is electrically connected with the lens module to be tested and receives a test image, the test image comprises a pattern of the first focusing image and a pattern of the second focusing image, and the fixing element drives the lens to move until the first focusing image and the second focusing image in the test image are in focus.