TWM569425U - Optical testing device - Google Patents

Abstract

An optical detecting device for detecting an optical device to be tested, and comprising a target, a light source and a support base. The target is formed with a pattern for detection. The light source is used to form a light that is adapted to illuminate the optical device to be tested after penetrating the target. The first image sensor is placed on the support base and is adapted to receive light from the optical device to be tested to obtain an image including the detection pattern. The distance between the first image sensor and the optical device to be tested is a preset object distance.

Description

Optical detection device

The present invention relates to an optical detecting device, and more particularly to an optical detecting device, which is in a reverse projection mode based on an optical detecting device with an MTF value, and further switches another detecting content to measure a short object distance lens optical MTF. value.

Optical modulation modulation transfer function (MTF) has become a common indicator for evaluating the optical quality of an optical component or optical system on the market today, for example, by examining a lens in a certain area. The optical resolution of the modulation function at each spatial frequency (ie, the optical spatial frequency response SFR) reveals the resolution of the lens for each spatial frequency (linear density) in that region.

Figure 1 shows a schematic view of a conventional lens detecting device for detecting a lens. Fig. 1 is a view showing a conventional so-called back projection MTF detecting device. Figure 1 is a conventional technique of Taiwan Patent Application No. 104123388. Referring to FIG. 1 , the lens detecting device 100 includes a light source 120 , at least one image sensor 114 , a host 115 , a target 110 , and a lens 130 . To detect different characteristics of the lens 130, different targets 110 can be used. For example, the target 110 includes a pattern 101 and a pattern 102. When testing, from After the light of the light source 120 is irradiated to the target 110, it passes through the lens 130 and is irradiated to the image sensor 114. The image sensor 114 captures a pattern image corresponding to the target 110 and transmits it to the host 115, and then analyzes the captured pattern image by using the host 115 to obtain, for example, a resolution and a photoelectric conversion function (OECF; Opto). -electronic conversion function), gray scale, modulation transfer function (MTF), or optical spatial responses. The target 110 includes the pattern 101 and the pattern 102. Therefore, the image captured by the image sensor 114 includes the image 111 corresponding to the pattern 101 and the image 112 of the corresponding pattern 102.

Figure 2 shows a schematic representation of another test pattern of a conventional target. As shown in FIG. 2, the detection pattern 110a of the target 110 is a line pattern, which is projected to the upper image sensor 114 via the lens 130 to be tested, and generally a group of image sensors 114 is generally responsible for analyzing a set of cross line patterns. In order to obtain the line spread function and MTF in the vertical and horizontal directions. In addition, a fast Fourier transform (FFT) is performed on the line distribution function to produce the aforementioned optically resolved spatial frequency response.

Figure 3 shows a schematic view of a conventional lens detecting device for detecting a lens. The technique of Figure 3 is an infinite-finite range conjugate system. As shown in FIG. 3, the lens detecting device 100 includes a target 110, a light source 120, a lens to be tested 130, a plurality of telescope heads and an image module 140, and a curved track 150. The light of the light source 120 penetrates the target 110, and the target 110 is engraved with a test pattern to be analyzed, and then the light is projected to the telephoto image module 140 via the lens 130 to be tested. The telephoto image module 140 includes a telescope head 141 and an image sensor 142. The telescope head 141 provides an infinite object distance, and the image sensor 142 takes an image containing the pattern of the target 110 and uses a computer and software calculation (not shown) to determine the image quality. In the lens detecting device 100 shown in FIG. 3, a plurality of sets of telephoto images can be installed. The group 140 is configured to simultaneously measure image quality of different field of view (FOV), and the telephoto image module 140 can also measure the image quality of another different viewing angle by moving along the arc surface of the curved track 150 as needed. The advantage of this architecture is that there are fewer restrictions on wide-angle lenses.

An object of the present invention is to provide an optical detecting device capable of setting a distance between a first image sensor and an optical device to be tested as a predetermined object distance, thereby measuring optical characteristic values at different positions. In one embodiment, it is capable of switching a general multi-module remote detection or using a single image module to detect optical eigenvalues of different short object distance lenses.

In one embodiment, the optical detecting device is configured to detect an optical device to be tested, and includes a target, a light source, and a support. The target is formed with a pattern for detection. The light source is used to form a light that is adapted to illuminate the optical device to be tested after penetrating the target. The first image sensor is placed on the support base and is adapted to receive light from the optical device to be tested to obtain an image including the detection pattern. The distance between the first image sensor and the optical device to be tested is a preset object distance.

In an embodiment, the optical detecting device further includes a displacement mechanism. The displacement mechanism is coupled to the support base for moving the support base to set a distance between the first image sensor and the optical device to be tested.

In an embodiment, the optical detecting device further includes a track and a plurality of telephoto image modules. The displacement mechanism is located in the track. A plurality of telephoto image modules are disposed on the track, and each of the telephoto image modules is adapted to form an infinity object distance and is adapted to receive light from the optical device to be tested. Moreover, the first image sensor is located in the middle of the track.

In one embodiment, the displacement mechanism sets the distance between the first image sensor and the optical device to be tested by adjusting the height of the first image sensor.

In one embodiment, each of the telephoto image modules includes a telescope head and an image sensor, and the telescope head provides an infinity object distance, and the image sensor of the telephoto image module located in the middle of the track As the first image sensor.

In one embodiment, the optical detecting device further includes a track and a plurality of telephoto image modules. The telephoto image modules are disposed on the track, and each of the telephoto image modules is adapted to form an infinity object distance and is adapted to receive light from the optical device to be tested. Moreover, the displacement mechanism causes the first image sensor to be located on the path of the light or not in the path of the light, thereby setting the first image sensor and the optical device to be tested when the first image sensor is located on the path of the light. The distance between them.

In one embodiment, the optical detecting device further includes a computer for receiving an image to obtain at least one optical characteristic of the optical device to be tested.

In one embodiment, the pattern for detection includes a plurality of test patterns, which are formed in different ways. The test locations, and the computer distinguishes and obtains the test patterns, and each of the test patterns at each of the test locations respectively determines the at least one optical feature of each of the test locations. Preferably, the at least one optical feature comprises an MTF value.

In one embodiment, the test patterns include a plurality of meshes extending in a first direction and located on a line connecting the test locations, continuously disposed.

In one embodiment, the optical detecting device is configured to switch between the general multi-module detection or the single image module to detect at least one optical feature of the different object distance lens. In an embodiment, the optical detecting device can obtain optical characteristics of a plurality of different positions in one test operation.

100‧‧‧Lens detection device

101‧‧‧ pattern

102‧‧‧ patterns

110‧‧‧ Target

110a‧‧‧Detection pattern

111‧‧‧Image

112‧‧‧ images

114‧‧‧Image Sensor

115‧‧‧Host

120‧‧‧Light source

130‧‧‧ lens

140‧‧‧ Telephoto Module

141‧‧‧ telescope head

142‧‧‧Image Sensor

150‧‧‧ curved track

200‧‧‧ optical inspection device

200a‧‧‧Optical inspection device

210‧‧‧ Target

210a‧‧‧Detection pattern

210b‧‧‧ test pattern

220‧‧‧Light source

230‧‧‧ Optical device to be tested

240‧‧‧ Telephoto Module

241‧‧‧ telescope head

242‧‧‧Image Sensor

242a‧‧‧First image sensor

250‧‧‧ curved track

271‧‧‧ support

272‧‧‧displacement mechanism

280‧‧‧ computer

Figure 1 shows a schematic view of a conventional lens detecting device for detecting a lens.

Figure 2 shows a schematic diagram of a test pattern of a conventional target.

Figure 3 shows a schematic diagram of another conventional back projection detection device.

4 is a schematic view showing an optical detecting device of an embodiment of the present invention.

Fig. 5 is a view showing a pattern for detecting a target of another embodiment of the present invention.

Figure 6 is a schematic view showing an optical detecting device of another embodiment of the present invention.

According to an embodiment of the present invention, an optical detecting device 200 is provided for switching a general multi-module detection or detecting a plurality of optical features of different object distance lenses by using a single image module. In one embodiment, the at least one optical feature comprises a modulation transfer function value (MTF value). 4 is a schematic view showing an optical detecting device of an embodiment of the present invention. As shown in FIG. 4, the optical detecting device 200 is configured to detect an optical device 230 to be tested, and includes a target 210, a light source 220, a first image sensor 242a, and a support base 271. The target 210 has a detection pattern 210a formed thereon. The support 271 supports the first image sensor 242a such that the distance between the first image sensor 242a and the optical device 230 to be tested is a predetermined object distance. The first image sensor 242a is placed on the support base 271 and is adapted to receive a light from the optical device 230 to be tested to obtain an image including the detection pattern 210a.

In an embodiment, the optical detecting device 200 further includes a computer 280. The computer 280 obtains an image including the detection pattern 210a to determine at least one optical characteristic of the optical device 230 to be tested. Fig. 5 is a view showing a pattern for detecting a target of another embodiment of the present invention. As shown in FIG. 5, the detection pattern 210a includes a plurality of test patterns 210b formed at different test positions. The computer 280 further analyzes the image of the detection pattern 210a by using an AOI technique such as an image recognition software, and distinguishes the plurality of test patterns 210b, and then calculates and obtains each test pattern 210b located at each test position. At least one optical feature of each test location. Preferably, the test patterns 210b comprise a plurality of meshes extending in a first direction or a second direction and located on a line connecting the test locations, continuously arranged.

In one embodiment, the optical detecting device 200 further includes a plurality of telephoto image modules 240 and a curved track 250. In an embodiment, a displacement mechanism 272 is further included. Light penetration of light source 220 The target 210 and the target 210 are engraved with the detection pattern 210a to be analyzed, and then the light is irradiated to the telephoto image modules 240 via the optical device 230 to be tested. The telephoto image module 240 can form an infinity object distance and capture an image. More specifically, the telephoto image module 240 includes a telescope head 241 and an image sensor 242. The telescope head 241 provides an infinity object distance, and the image sensor 242 captures an image containing the pattern of the target 210 and calculates the image using a computer 280 storing the software calculation to obtain the image quality. In this embodiment, the image sensor 242 of the telephoto image module 240 located in the middle of the curved track 250 serves as the first image sensor 242a. As shown in FIG. 4, the displacement mechanism 272 is coupled to the support base 271 for moving the support base 271 to set the distance between the first image sensor 242a and the optical device 230 to be tested. More specifically, the displacement mechanism 272 removes the original telescope head 241 of the intermediate telephoto image module 240 and reduces the height of the first image sensor 242a to a desired object distance, thereby setting the first image sensor 242a. The distance from the optical device 230 to be tested is a predetermined object distance, enabling the optical detecting device 200 to perform optical detection of a short object distance. Preferably, all test patterns 210b are sensed in the first image sensor 242a at this time. The computer 280 further utilizes an image recognition software to distinguish the plurality of test patterns 210b, and then uses each test pattern 210b located at each test position to obtain at least one optical feature of each test position.

When the optical detecting device 200 is applied to the far object distance detection, the plurality of telephoto image modules 240 can be used to perform optical detection at a far object distance, and when applied to the short object distance detection, the single first image sensor 242a is used as a short object. Optical detection is performed. In the present invention, the optical device 230 to be tested may be a lens to be tested or a module to be tested. The lens and image module can be, for example, a camera lens, a monitor, or a telescope. Additionally, the displacement mechanism 272 can be a manual displacement mechanism or include an electric motor The displacement mechanism of the motor.

If the original object distance function of the telephoto image module 240 in the middle of the embodiment of FIG. 4 is retained, in an embodiment, a first image sensor 242a may be additionally added at a desired object height position. Figure 6 is a schematic view showing an optical detecting device of another embodiment of the present invention. The embodiment of Fig. 6 is similar to the embodiment of Fig. 4, and therefore the same elements are denoted by the same reference numerals, and the related description will be omitted. Only the at least one difference will be described below. As shown in FIG. 6, in the optical detecting device 200a, the displacement mechanism 272 is adapted to position the first image sensor 242a on the path of the light or not on the path of the light, so that the first image sensor 242a is located in the light. The distance between the first image sensor 242a and the optical device 230 to be tested is set to be a preset object distance. Preferably, all test patterns 210b are sensed in the first image sensor 242a at this time. The computer 280 further utilizes an image recognition software to distinguish the plurality of test patterns 210b, and then uses each test pattern 210b located at each test position to obtain at least one optical feature of each test position. When the first image sensor 242a is not located on the path of the light, the light from the optical device 230 to be tested is not received. In this embodiment, when the first image sensor 242a is located on the path of the light, the target 210 faces the first image sensor 242a.

In one embodiment, the curved track 250 is a continuous curved surface, and a telephoto image module 240 can be disposed at a middle position. The support base 271 is coupled to a displacement mechanism 272 that allows the support base 271 to be selectively located outside of the curved track 250 or inside the curved track 250. When the support base 271 is inside the curved track 250, the first image sensor 242a is located on the path of the light, and the target 210 faces the first image sensor 242a, and can only be detected by the first image sensor 242a. Optical measurement of the telephoto image module 240 located in the middle of the curved track 250 is not possible. Support base 271 In the outer side of the curved track 250, the first image sensor 242a is not located on the path of the light, and the target 210 does not face the first image sensor 242a, and the telephoto image mode located in the middle of the curved track 250 can be utilized. Group 240 is optically measured.

In one embodiment, the device is not limited to manual or automatic switching, that is, the displacement mechanism 272 can be coupled to the computer 280, automatically controlled by the computer 280, or manually operated by the user. Moreover, the present invention does not limit the pattern of the test pattern 210b, which may use a line, edge or other MTF detection pattern.

According to an embodiment of the present invention, the optical detecting device 200 is configured to switch a general multi-module remote detection or to detect at least one optical feature of a different short object lens by using a single image module. In one embodiment, the pattern for detection 210a includes a plurality of test patterns 210b formed at different test locations. The computer 280 further analyzes the image of the detection pattern 210a by using an AOI technique such as an image recognition software, and distinguishes the plurality of test patterns 210b, and then calculates and obtains each test pattern 210b located at each test position. At least one optical feature of each test location. Therefore, optical characteristics of a plurality of different positions can be obtained in one test operation.

Claims (9)

An optical detecting device for detecting an optical device to be tested, comprising: a target formed with a detecting pattern; a light source for forming a light, the light being adapted to penetrate the target and illuminating the optical to be tested And a first image sensor disposed on the support base for receiving the light from the optical device to be tested to obtain an image including the detection pattern, wherein the first image The distance between the inductor and the optical device to be tested is a preset object distance. The optical detecting device of claim 1, further comprising: a displacement mechanism coupled to the support base for moving the support base to set a distance between the first image sensor and the optical device to be tested. The optical detecting device according to claim 2, further comprising: a track, the displacement mechanism is disposed on the track; and a plurality of telephoto image modules disposed on the track, and each of the telephoto image modules is adapted to be formed An infinity object distance and adapted to receive the light from the optical device to be tested, and the first image sensor is located in the middle of the track. The optical detecting device according to claim 3, wherein the displacement mechanism sets a distance between the first image sensor and the optical device to be tested by adjusting a height of the first image sensor. The optical detecting device of claim 4, wherein each of the telephoto image modules comprises a telescope head and an image sensor, and the telescope head Providing an infinity object distance, and the displacement mechanism is adapted to move the telescope head of the telephoto image module located in the middle of the track, and the image sensor of the telephoto image module located in the middle of the track As the first image sensor, the optical detecting device performs optical detection of short object distance. The optical detecting device of claim 2, further comprising: a track; and a plurality of telephoto image modules disposed on the track, and each of the telephoto image modules is adapted to form an infinity object distance and adapted Receiving the light from the optical device to be tested, and the displacement mechanism is configured to locate the first image sensor in a path of the light or not in the light, so that the first image sensor is located in the light The distance between the first image sensor and the optical device to be tested is set on the path. The optical detecting device according to any one of claims 1 to 6, further comprising: a computer for receiving the image of the first image sensor to obtain at least one optical characteristic of the optical device to be tested. The optical detecting device according to claim 7, wherein the detecting pattern comprises a plurality of test patterns respectively formed at different plurality of test positions, and the computer distinguishes and obtains the test patterns, and the test is located in each of the tests. Each of the test patterns of the position respectively determines the at least one optical feature of each of the test locations. The optical detecting device of claim 8, wherein the at least one optical feature comprises an MTF value.