MTF detection device for wafer-level optical element

1 . A MTF detection device for a wafer-level optical element, wherein the device comprises:

a luminescent source, a mobile disc, an adjustable bracket, and a detection assembly;

a plurality of luminescent sources is used to emit light signals and are set sequentially along a direction of a light path, and the plurality of luminescent sources are movable along the direction of the light path;

the mobile disc is set up with a placing area, and the mobile disc is movable, so as to locate different locations of the placing area on an extension of a central line of the luminescent source by moving the mobile disc;

the placing area is used to place a sample to be detected;

a distance between the adjustable bracket and the luminescent a source is adjustable, and an external processing assembly is located on a first side of the adjustable bracket; and the first side of the adjustable bracket is a side that is close to the luminescent source; and

the detection assembly is installed over the adjustable bracket, and is used to receive the light emitted from the luminescent source through the sample to be detected and through the external processing assembly.

2 . The MTF detection device according to claim 1 , wherein the luminescent source performs a vertical movement along the direction of the light path to move the luminescent source to an image plane of the sample to be detected.

3 . The MTF detection device according to claim 1 , wherein the external processing assembly comprises: a groove and an optical assembly.

4 . The MTF detection device according to claim 1 , wherein the optical element comprises: an aperture assembly; wherein

the aperture assembly comprises an aperture element and a lens;

the bottom of the groove has a hole, and the hole is used for the light to pass through; and

the hole is coaxially set with the luminescent source all the time.

5 . The MTF detection device according to claim 4 , wherein a size of the groove is adjustable; and

the aperture assembly is located at a center of the groove.

6 . The MTF detection device according to claim 1 , wherein a lift mechanism is set on the one end of the adjustable bracket that is away from the external processing assembly; wherein

the lift mechanism comprises: a first lift structure, a second lift structure, and a lift element;

the first lift structure is used to control a larger vertical movement of the lift element; and

the second lift structure is used to control a smaller vertical movement of the adjustable bracket on the lift element.

7 . The MTF detection device according to claim 6 , wherein the first lift structure comprises a fixed bracket and a lock assembly;

the first lift structure adjusts the lock assembly to control the vertical movement of the lift element on the fixed bracket;

the second lift structure comprises a fine-tuning assembly; and

the second lift structure controls the vertical movement of the adjustable bracket on the lift element.

8 . The MTF detection device according to claim 7 , wherein the fixed bracket and a base are in a fixed connection;

the lift element is socketing to the fixed bracket;

the fine-tuning assembly is installed on one end of the lift element that is away from the adjustable bracket;

the lock assembly is used to make the lift element and the adjustable bracket perform simultaneous vertical movement when the lock assembly is open; and

the lock assembly is used to lock the lift element and the adjustable bracket together to form a fixation when the lock assembly is closed.

9 . The MTF detection device according to claim 8 , wherein the fine-tuning assembly comprises: a differential head, an expansion rod, a sliding block, a side plate and a guide rail;

the guide rail is located on one side of the lift element that is close to the adjustable bracket;

the adjustable bracket is fixed on the side plate, and the side plate is installed on one side of the sliding block that is away from the guide rail;

one end of the expansion rod is connected to the differential head, and the other end of the expansion rod is connected to the sliding block;

when the differential head is used to shorten the expansion rod, the expansion rod shortens and moves the sliding block toward the differential head, and the adjustable bracket performs the downward movement with the sliding block simultaneously; and

when the differential head is used to lengthen the expansion rod, the expansion rod lengthens and moves the sliding block away from the differential head, and the adjustable bracket performs the upward movement with the sliding block simultaneously.

10 . The MTF detection device according to claim 8 , wherein the guide rail and the sliding block are in a detachable connection, and the sliding block and the adjustable bracket are in a detachable connection.

11 . The MTF detection device according to claim 9 , wherein the expansion rod and the sliding block are in a plug-in connection.

12 . The MTF detection device according to claim 1 , wherein the detection assembly comprises: a first detector;

the first detector and the luminescent source are located along the direction of the light path, and the first detector is fixed over the luminescent source; and

the first detector is used to receive the light signal emitted by the center of the luminescent source.

13 . The MTF detection device according to claim 12 , wherein the detection assembly comprises: a plurality of second detectors;

the first detector and the plurality of the second detectors are located at different positions; and

the second detector is used to receive the light signal emitted by a non-center of the luminescent source.

14 . The MTF detection device according to claim 13 , wherein the detection assembly comprises: a dome bracket, and a plurality of chutes;

the first detector is fixed at the center of the dome bracket;

each of the chutes in the plurality of the chutes is disposed on the dome bracket, one end of each chutes is disposed at the center of the dome bracket, and the direction of the chutes extends from the center of the dome bracket to the direction that is away from the center of the dome bracket;

each of the second detector is installed in each chute, respectively; and

the light signal emitted by the luminescent source passes through the sample to be detected and through the external processing assembly, then is received by the detection assembly.

15 . The MTF detection device according to claim 7 , wherein the lock assembly comprises a fixed valve and a threaded hole;

the life element is set with the threaded hole;

the fixed valve is through the thread hole to clamp the fixed bracket, so as to fix the lift element on the fixed bracket; and

the fixed valve is used to deactivate the clamp status between the fixed valve and the fixed bracket by rotating the fixed valve, so as to open the lock assembly and make the lift element to perform vertical movement on the fixed bracket.

16 . The MTF detection device according to claim 10 , wherein the differential head is connected to the lift element by the fixed assembly;

the fixed assembly comprises a ring element and a support rod;

the differential head passes through the ring element and connects to the expansion rod; and

one end of the support rod is connected to the ring element, and the other end of the support rod is fixedly connected to the lift element.

17 . The MTF detection device according to claim 1 , wherein the sample to be detected is a wafer-level optical element.

18 . The MTF detection device according to claim 17 , wherein the sample to be detected is a wafer-level metalens.

19 . The MTF detection device according to claim 18 , wherein the sample to be detected is a wafer-level micro-nano grating structure.

20 . The MTF detection device according to claim 1 , wherein the luminescent source is set coaxially with the external processing assembly, so as to make the light signal emitted by the luminescent source pass through the sample to be detected and through the external processing assembly, and then be received by the detector to complete the MTF detection of the sample to be detected.