TWI808918B - Focusing system - Google Patents

Abstract

A focusing system is used for performing a focusing process on a lens module under test. The focusing system includes a light source, a frame, a first focusing pattern and a focusing device. The frame is disposed on one side of the light source. The first focusing pattern is disposed between the light source and the frame. The focusing device is disposed in the frame. The focusing device includes a fixation member and a second focusing pattern. The fixation member clamps a lens of the lens module under test. There is a first predetermined distance between the lens and the first focusing pattern. The second focusing pattern is disposed on the fixation member, and there is a second predetermined distance between the lens and the second focusing pattern. The first predetermined distance is greater than the second predetermined distance.

Description

Focusing system

The present invention relates to a focusing system, in particular to a focusing system for a fixed-focus lens.

The focusing method of the lens module is mainly to fix the lens module with a jig or a holding element, and then use the holding device to adjust the relative position of the lens (lens) and the image sensor (image sensor) for focusing.

When focusing on the fixed-focus lens module, a specified focus distance will be set according to the needs of the usage scenario. For example, if the usage situation is that the distance between the camera and the object is usually 10 centimeters, then the specified focus distance will be set to 10 centimeters. Generally speaking, the main components of the focusing system include a light box, a focusing chart (that is, a test chart for focusing) and a holding device. Wherein, both the focusing map and the holding device are arranged in the light box, and the holding device holds the lens to be tested. Before focusing, the focus chart will be set at the specified focus distance (that is, 10 cm) away from the lens to be tested. When focusing, the holding element can be used to rotate the lens under test to adjust the relative position of the lens under test and the image sensor until the focus map in the output image is clear (in focus).

However, if a fixed-focus lens is in focus at a position of 10 cm, the distance from 1.5 cm to infinity can be covered according to the depth of field table, but only at a distance of about 10 cm will be clear, and the rest of the distance will be relatively blurred, let alone the image at a distance of less than 1.5 cm. Therefore, it is difficult to ensure that the focus images of the fixed-focus lens are clear both in the near view and the distant view. In other words, if the foreground is in focus, the foreground may still be blurry; conversely, if the foreground is in focus, the foreground may still be blurry. Therefore, the conventional focusing method and the used focusing system cannot determine whether the images of the fixed-focus lens in the close-range focus and the long-range focus can be clear, and there is room for improvement.

In view of the above-mentioned problems, the main purpose of the present invention is to provide a focusing system, which includes a first focusing map and a focusing device, through the structure of the first focusing map and the focusing device including a second focusing map, to solve the problem that the conventional focusing system cannot judge whether the images of the lens module to be tested can be clear in the close-range focus and the distant-view focus.

To achieve the above object, the present invention provides a focusing system for performing a focusing process on a lens module to be tested. The focus system includes a light source, a frame, a first focus map and a focus device. The frame is arranged on one side of the light source. The first focusing map is set between the light source and the frame. The focusing device is arranged in the frame. The focusing device includes a holding element and a second focusing map. The holding element holds a lens of the lens module to be tested. There is a first predetermined distance between the lens and the first focusing map. The second focus map is set on the holding element and has a second predetermined distance from the lens. The first predetermined distance is greater than the second predetermined distance.

According to an embodiment of the present invention, the first focusing map does not overlap with the second focusing map.

According to an embodiment of the present invention, the holding element includes a clamping portion and a first supporting portion. The clamping part is located on a bottom side of the holding element, and the first supporting part is located on a top side of the holding element.

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

According to an embodiment of the present invention, the clamping part fixes the lens. The focusing device includes a focusing plate, and the second focusing image 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 device includes a focusing lens. The focusing lens is arranged on the first supporting part and is located above the focusing plate.

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

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

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

According to an embodiment of the present invention, the holding element includes a second supporting portion, and the cover plate is fixed to the second supporting portion.

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

According to an embodiment of the present invention, the focusing system further includes a control module electrically connected to the lens module to be tested and receiving a test image. The test image includes the pattern of the first focus map and the pattern of the second focus map, and the holding element drives the lens to move until both the first focus map and the second focus map in the test image are in focus.

Based on the above, the focusing system according to the present invention includes a light source, a frame, a first focusing map and a focusing device. The first focusing map is set between the light source and the frame. The holding element of the focusing device clamps the lens of the lens module to be tested, and the focusing device includes a second focusing map. Wherein, there is a first predetermined distance between the lens and the first focusing map, and a second predetermined distance between the lens and the second focusing map, and the first predetermined distance is greater than the second predetermined distance. With the aforementioned structure, the focusing system uses the first focusing map to confirm that the long-range focus image of the lens module under test is clear, and uses the second focus map to confirm that the close-range focus image of the test lens module is clear. Therefore, the images of the specified close-range and long-range images of the lens module under test that is focused by the focusing system of the present invention can be clearly presented.

In order to better understand the technical content of the present invention, preferred specific embodiments are given as follows.

FIG. 1 is a schematic diagram 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 diagram of the focusing device shown in FIG. 1 and the lens module to be tested. Please refer to FIG. 1 , FIG. 2 and FIG. 3 . Firstly, the focusing system 1 of this embodiment is used to perform a focusing process on a lens module 9 to be tested. Wherein, the lens module 9 to be tested is a fixed-focus lens module as an example. In this embodiment, the focusing system 1 includes a light source 10 , a frame 20 , a first focusing map 30 and a focusing device 40 . The frame 20 is disposed on one side of the light source 10 , for example, the frame 20 is located below the light source 10 . In this embodiment, the light source 10 is a light source board placed on the top side 21 of the frame 20 . In addition, the top side 21 of the frame 20 is made of light-transmitting material, so that the light emitted by the light source 10 can enter into the frame 20 .

The first focusing map 30 is disposed between the light source 10 and the frame 20 . In one embodiment, the first focusing map 30 can be directly printed on the side of the frame 20 close to the light source 10 . In one embodiment, the first focusing map 30 can be printed on a light-transmitting plate, and the light-transmitting plate with the first focusing map 30 is disposed on the side of the frame 20 close to the light source 10 , or between the frame 20 and the light source 10 . In this embodiment, the first focusing map 30 is printed on a transparent plastic sheet, and the transparent plastic sheet with the first focusing map 30 is disposed on the top side 21 of the frame 20 . The light source 10 is placed on the top side 21 of the frame 20 and above the transparent plastic sheet, so that the first focusing image 30 is located between the light source 10 and the frame 20 .

The focusing device 40 is disposed in the frame 20 . Fig. 4 is an exploded schematic view of the adjustment device shown in Fig. 1, and Fig. 5 is a schematic cross-sectional view of the focusing device and the lens module to be tested shown in Fig. 3, please refer to Fig. 3, Fig. 4 and Fig. 5. The focus device 40 includes a holding element 41 and a second focus map 42 . The holding element 41 clamps a lens 91 of the lens module 9 to be tested, so that the lens 91 has a first predetermined distance D1 from the first focusing map 30 (as shown in FIG. 1 ). The second focusing map 42 is disposed on the holding element 41 and has a second predetermined distance D2 from the lens 91 (as shown in FIG. 5 ). It should be noted that since the first focusing map 30 and the second focusing map 42 are relatively thin, they are marked on the sidelines. Since the holding element 41 clamps the lens module 9 to be tested, the second focusing map 42 is closer to the lens 91 than the first focusing map 30 , so the first predetermined distance D1 is greater than the second predetermined distance D2 .

It should be noted that the predetermined distance referred to in this embodiment refers to a preset designated focus distance. Wherein, the first focusing chart 30 in this embodiment is a test chart for focusing in the distant view, so the first predetermined distance D1 may be a designated focusing distance for the distant view. Moreover, the second focus chart 42 is a test chart for close-up focus, so the second predetermined distance D2 may be a specified focus distance for close-up. For example, if the use situation of the lens module 9 to be tested is that it can present a clear image at a distance of 1 cm to 10 cm from the object, then the designated focusing distance for the distant view can be set to 10 cm, and the designated focusing distance for the close view can be set to 1 cm. In other words, the first predetermined distance D1 can be set to 10 cm, and the second predetermined distance D2 can be set to 1 cm. In this embodiment, by adjusting the height of the frame 20 or the position of the holding element 41 , the distance between the lens 91 and the first focusing image 30 located on the top side 21 of the frame 20 is 10 cm (that is, the first predetermined distance D1). In addition, the distance between the second focus map 42 and the lens 91 is 1 cm (that is, the second predetermined distance D2 ) by the height of the holding element 41 itself or the setting position of the second focus map 42 .

Specifically, the holding element 41 of this embodiment includes a clamping portion 411 and a first supporting portion 412 , as shown in FIG. 4 and FIG. 5 . The clamping portion 411 is located on a bottom side of the holding element 41 , and the first supporting portion 412 is located on a top side of the clamping portion 411 . The clamping portion 411 is an annular shape with a small inner diameter, and the first support portion 412 may be an annular platform with a relatively large inner diameter. Preferably, the holding element 41 in this embodiment has a funnel-shaped structure, and the outer perimeter of the top side of the holding element 41 is longer than the outer perimeter of the bottom side.

The clamping part 411 fixes the lens 91 , for example, the clamping part 411 is sleeved on the outside of the lens 91 , so that the inner wall of the clamping part 411 clamps and fixes the lens 91 . The second focusing map 42 is disposed on the first supporting portion 412 . Specifically, the focusing device 40 of this embodiment includes a focusing plate 43 , and the second focusing map 42 is formed on the focusing plate 43 . Wherein, the focusing plate 43 is a transparent plastic sheet, preferably a circular transparent plastic sheet. The second focusing map 42 is printed on the focusing plate 43 , and the focusing plate 43 is disposed on the first supporting portion 412 . Therefore, in this embodiment, by designing the height between the first support portion 412 of the holding element 41 and the lens 91 to be 1 cm (ie, the second predetermined distance D2), the second focus map 42 is separated from the lens 91 by 1 cm (ie, the second predetermined distance D2).

It should be noted that both the first focusing map 30 and the second focusing map 42 can be alternately provided with black and transparent color blocks, and the first focusing map 30 and the second focusing map 42 in FIG. 2 and FIG. In other embodiments, the first focusing map 30 or the second focusing map 42 may also be densely arranged lines or other patterns suitable for focusing, which is not limited by the present invention.

In this embodiment, the height (or thickness) of the holding element 41 is designed to be greater than or equal to the second predetermined distance D2, so that the shortest distance between the clamping portion 411 and the first support portion 412 is substantially the second predetermined distance D2 (for example, 1 cm). Therefore, after the clamping portion 411 fixes the lens 91 , the distance between the lens 91 and the second focusing map 42 can be the second predetermined distance D2 (for example, 1 cm).

Preferably, the focusing device 40 also includes a focusing lens 44 . The focusing lens 44 is made of light-transmitting material, such as but not limited to a transparent plastic plate or glass plate. Preferably, the focusing lens 44 and the focusing plate 43 are both circular. The focus lens 44 is disposed on the first support portion 412 and above the focus plate 43 for fixing the second focus map 42 and the focus plate 43 to the holding element 41 . In other embodiments, the focus lens 44 and the focus plate 43 can also be in other shapes, as long as they can be fixed on the holding element 41 , the present invention is not limited thereto.

Preferably, the focusing device 40 may further include a cover plate 45 disposed on the top side of the holding element 41 . Specifically, the holding element 41 further includes a second support portion 413 , and the second support portion 413 is disposed adjacent to the first support portion 412 . In this embodiment, both the first supporting portion 412 and the second supporting portion 413 are ring-shaped platforms, and are stepped due to the difference in size and height. As viewed from the center of the focusing device 40 , the second support portion 413 is close to the outer edge and 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 FIGS. 4 and 5 . The cover plate 45 is disposed on the first support portion 412 and is fixed to the second support portion 413 in a screw lock manner. Since the cover plate 45 is located above the focus lens 44 , the focus lens 44 can be fixed to the holding element 41 .

In this embodiment, the cover plate 45 is also an annular structure, so the cover plate 45 has a hollow portion 451 . Wherein, the hollow portion 451 corresponds to the second focusing map 42 to prevent the cover plate 45 from blocking the second focusing map 42 . Moreover, when the annular cover plate 45 is arranged on the second support portion 413, the inner edge portion of the cover plate 45 is located above the first support portion 412, so that the inner edge portion of the cover plate 45 overlaps with the outer edge portion of the focus lens 44, and then the focus lens 44 can be fixed to the holding element 41. In other embodiments, the cover plate 45 can also be a circular transparent plate and disposed on the second support portion 413 .

Preferably, the first focusing map 30 and the second focusing map 42 do not overlap, as shown in FIG. 2 . Specifically, the range where the first focusing map 30 is projected onto the focusing plate 43 does not overlap with the second focusing map 42 . In this embodiment, the first focusing map 30 is ring-shaped, the second focusing map 42 is circular, and the second focusing map 42 corresponds to the hollow portion of the ring-shaped first focusing map 30 . Since the first focusing map 30 and the second focusing map 42 do not overlap, it is possible to simultaneously check whether the first focusing map 30 and the second focusing map 42 in a test image are clear without interfering with each other.

FIG. 6 is a schematic diagram of a test image generated by the focusing system shown in FIG. 1 , 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 a test image from the lens module 9 to be tested. The control module 50 is also electrically connected to a display screen to present the test image, as shown in FIG. 6 . Wherein, the test image includes the pattern of the first focusing map 30 and the pattern of the second focusing map 42 . As shown in FIG. 5 , the lens module 9 to be tested further includes an image sensor 92 and a lens mount 93 . The image sensor 92 is disposed at the bottom of the mirror base 93 . The lens 91 is movably connected to the mirror base 93 and corresponds to the image sensor 92 . During the focusing process, the lens 91 can be driven by the holding element 41 of the focusing device 40 to move, so as to adjust the relative distance between the lens 91 and the image sensor 92, until the first focusing image 30 and the second focusing image 42 in the test image are in focus (that is, both present clear images), as shown in FIG. 6 . For example, if the lens 91 is screwed to the mirror base 93, the focusing device 40 can be rotated clockwise or counterclockwise, and the holding element 41 can drive the lens 91 to rotate, so as to adjust the distance between the lens 91 and the image sensor 92 until the first focusing image 30 and the second focusing image 42 both show clear images. In other words, the focusing system 1 of the present embodiment can confirm that the images of the lens module 9 under test in both the close-range focus and the long-range focus are clear.

Specifically, when the focus-adjusted lens module 9 under test is separated from the object by 1 cm (i.e., the specified focus distance for the close view), the distant view part can still clearly present an image (for example, the image of the object or environment 10 cm away from the lens module 9 under test). On the contrary, when the distance between the lens module 9 under test and the object after focus adjustment is 10 centimeters, it can still clearly present the close-up image (for example, the distance between the lens module 9 under test and the object 9 is 1 centimeter). In other words, the lens module 9 to be tested for focusing by the focusing system 1 of the present embodiment can clearly present (ie, be in focus) the specified close-range and distant-view images.

In addition, the first focus map 30 is disposed between the light source 10 and the frame 20, and the focus device 40 has the structure of the second focus map 42, so that the difference between the first predetermined distance D1 and the second predetermined distance D2 can be quite large. Therefore, the focusing system 1 of the present embodiment can be applied in a situation where there are specified focus distances for both the long view and the close view, and the difference between the specified focus distances for the long view and the close view can be quite large. For example, the first predetermined distance D1 in this embodiment may be equal to 10 times the second predetermined distance D2, and correspondingly, the designated focus distance of the distant view may be equal to 10 times the designated focus distance of the near 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 is just an example, and it can also be adjusted to other values according to the usage situation.

FIG. 7 is a schematic diagram of a focusing device according to another embodiment of the present invention, please refer to FIG. 7 . The focus device 40a of this embodiment includes a holding element 41 , a second focus map 42a , a focus lens 44a and a cover plate 45 . Wherein, the holding element 41 and the cover plate 45 are the same as those of the foregoing embodiments, so their element numbers are used. The difference from the previous embodiment is that the second focus map 42a of this embodiment is formed on the focus lens 44a. For example, the focus lens 44a may be a glass plate, and the second focus image 42a is formed on the focus lens 44a by etching. In other words, the second focus pattern 42a may be a pattern (such as a square) etched on the focus lens 44a. In addition, the focusing lens 44a is also circular, and is disposed on the first supporting portion 412 to make the second focusing lens 42a. Therefore, in this embodiment, the second focusing map 42a is formed on the focusing lens 44a to replace the focusing plate of the previous embodiment.

In summary, according to the focusing system of the present invention, it includes a light source, a frame, a first focusing map and a focusing device. The first focusing map is set between the light source and the frame. The holding element of the focusing device clamps the lens of the lens module to be tested, and the focusing device includes a second focusing map. Wherein, there is a first predetermined distance between the lens and the first focusing map, and a second predetermined distance between the lens and the second focusing map, and the first predetermined distance is greater than the second predetermined distance. With the aforementioned structure, the focusing system uses the first focusing map to confirm that the long-range focus image of the lens module under test is clear, and uses the second focus map to confirm that the close-range focus image of the test lens module is clear. Therefore, the images of the specified close-range and long-range images of the lens module under test that is focused by the focusing system of the present invention can be clearly presented.

It should be noted that the above-mentioned embodiments are examples for the convenience of description, and the scope of rights claimed by the present invention should be determined by the scope of the patent application, rather than limited to the above-mentioned embodiments.

1: Focusing system 10: light source 20: frame 21: top side 30: The first focusing map 40, 40a: focusing device 41: Holding element 411: clamping part 412: The first support part 413: the second support part 42, 42a: the second focus map 43: Focus plate 44, 44a: focusing lens 45: cover plate 451: hollow part 50: Control module 9: Lens module to be tested 91: Lens 92: Image sensor 93:Mirror holder D1: The first predetermined distance D2: second predetermined distance

FIG. 1 is a schematic diagram 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 schematic diagram of the training 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 diagram of a focusing device according to another embodiment of the present invention.

40: Focusing device

41: Holding element

411: clamping part

412: The first support part

413: the second support part

42:Second focusing map

43: Focus plate

44: Focus lens

45: cover plate

451: hollow part

Claims (12)

A focusing system is used to perform a focusing process on a lens module to be tested, and the focusing system includes: a light source; a frame, arranged on one side of the light source; a first focusing map, disposed between the light source and the frame; and A focusing device is arranged in the frame, and the focusing device includes: A holding element clamps a lens of the lens module to be tested, and the lens has a first predetermined distance from the first focusing map; and A second focus map is arranged on the holding element and has a second predetermined distance from the lens, and the first predetermined distance is greater than the second predetermined distance. The mirror focusing system according to claim 1, wherein the first focusing map and the second focusing map do not overlap. The focusing system according to claim 1, wherein the holding element includes a clamping part and a first supporting part, the clamping part is located at a bottom side of the holding element, and the first supporting part is close to a top side of the holding element. The focusing system as claimed in claim 3, wherein the holding element is a funnel shape, and the outer perimeter of the top side of the holding element is larger than the outer perimeter of the bottom side. The focusing system according to claim 3, wherein the clamping portion fixes the lens, the focusing device includes a focusing plate, the second focusing map is formed on the focusing plate, and the focusing plate is arranged on the first supporting portion. The focusing system according to claim 5, wherein the focusing device includes a focusing lens, and the focusing lens is arranged on the first supporting part and is located above the focusing plate. The focusing system according to claim 3, wherein the focusing device includes a focusing lens, the second focusing image is formed on the focusing lens, and the focusing lens is arranged on the first supporting part. The focusing system as claimed in claim 1, wherein the focusing device further includes a cover plate disposed on a top side of the holding element. The focusing system according to claim 8, wherein the cover plate has a hollow portion corresponding to the second focusing map. The focusing system as claimed in claim 8, wherein the holding element includes a second support portion, and the cover plate is fixed to the second support portion. The focusing system according to claim 10, wherein the second supporting part is disposed adjacent to the first supporting part, and the second supporting part is close to an outer edge of the holding element. The focusing system as described in claim 1 further includes: A control module is electrically connected to the lens module to be tested, and receives a test image, the test image includes the pattern of the first focus map and the pattern of the second focus map, and the holding element drives the lens to move until the first focus map and the second focus map in the test image are in focus.

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