阅读说明：本技术 一种曝光系统及光刻机 (Exposure system and photoetching machine ) 是由 湛宾洲 王彩红 于 2019-01-17 设计创作，主要内容包括：本发明实施例提供一种曝光系统及光刻机,曝光系统包括：沿光轴依次排列的光源、耦合镜组、匀光组件、中继镜组和投影物镜；所述曝光系统还包括能量传感器和至少一个能量探测器,所述能量传感器位于所述投影物镜的像面上；所述匀光组件包括第一匀光单元和第二匀光单元,所述第一匀光单元位于所述耦合镜组与所述第二匀光单元之间,所述第一匀光单元与所述第二匀光单元沿光轴方向上存在空隙；所述能量探测器位于所述匀光组件一侧且朝向所述空隙处,所述能量探测器用于接收从所述空隙出射的光线,并对所述能量传感器进行标定。本发明实施例提供一种曝光系统及光刻机,以实现提高能量探测器的线性度,以及提高曝光剂量的控制精度。(The embodiment of the invention provides an exposure system and a photoetching machine, wherein the exposure system comprises: the light source, the coupling lens group, the dodging component, the relay lens group and the projection objective lens are sequentially arranged along an optical axis; the exposure system further comprises an energy sensor and at least one energy detector, wherein the energy sensor is positioned on the image surface of the projection objective; the light homogenizing assembly comprises a first light homogenizing unit and a second light homogenizing unit, the first light homogenizing unit is positioned between the coupling mirror group and the second light homogenizing unit, and a gap exists between the first light homogenizing unit and the second light homogenizing unit along the direction of an optical axis; the energy detector is positioned on one side of the light uniformizing assembly and faces the gap, and the energy detector is used for receiving light rays emitted from the gap and calibrating the energy sensor. The embodiment of the invention provides an exposure system and a photoetching machine, which are used for improving the linearity of an energy detector and improving the control precision of exposure dose.)

1. An exposure system, comprising: the light source, the coupling lens group, the dodging component, the relay lens group and the projection objective lens are sequentially arranged along an optical axis;

the exposure system further comprises an energy sensor and at least one energy detector, wherein the energy sensor is positioned on the image surface of the projection objective;

the light homogenizing assembly comprises a first light homogenizing unit and a second light homogenizing unit, the first light homogenizing unit is positioned between the coupling mirror group and the second light homogenizing unit, and a gap exists between the first light homogenizing unit and the second light homogenizing unit along the direction of an optical axis; the energy detector is positioned on one side of the light uniformizing assembly and faces the gap, and the energy detector is used for receiving light rays emitted from the gap and calibrating the energy sensor.

2. The exposure system according to claim 1, further comprising at least one mirror disposed in one-to-one correspondence with the energy detectors, the mirror being located between the light unifying unit and the energy detectors in one-to-one correspondence with the mirror, the mirror being configured to reflect the light exiting from the gap onto the energy detectors in one-to-one correspondence with the mirror.

3. The exposure system according to claim 1, wherein a width of the gap between the first light unifying unit and the second light unifying unit is 0.05mm or more and 0.2mm or less.

4. The exposure system of claim 1, wherein the first dodging unit is symmetric about a first dodging unit central axis, the second dodging unit is symmetric about a second dodging unit central axis, the first dodging unit central axis and the second dodging unit central axis are collinear;

the vertical distance between the surface of one side, facing the energy detector, of the first dodging unit and the energy detector is smaller than or equal to the vertical distance between the surface of one side, facing the energy detector, of the second dodging unit and the energy detector.

5. The exposure system of claim 4, wherein the number of energy detectors is 2-4.

6. The exposure system of claim 5, wherein the exposure system comprises two of the energy detectors, a first energy detector and a second energy detector; the first energy detector and the second energy detector are respectively positioned at two opposite sides of the central axis of the first dodging unit and the central axis of the second dodging unit.

7. The exposure system of claim 5, wherein the exposure system comprises four of the energy detectors, and the four energy detectors are uniformly distributed around the central axis of the first light homogenizing unit and the central axis of the second light homogenizing unit.

8. The exposure system according to claim 1, wherein the first dodging unit is symmetrical about a first dodging unit central axis, the second dodging unit is symmetrical about a second dodging unit central axis, the first dodging unit central axis is parallel to the second dodging unit central axis, and a perpendicular distance between the first dodging unit central axis and the second dodging unit central axis is greater than 0;

the vertical distance between the surface of one side, facing the energy detector, of the first dodging unit and the energy detector is smaller than or equal to the vertical distance between the surface of one side, facing the energy detector, of the second dodging unit and the energy detector.

9. The exposure system of claim 8, wherein the first dodging unit comprises first and second opposing sides parallel to a central axis of the first dodging unit; the second light homogenizing unit comprises a third side surface and a fourth side surface which are parallel to the central axis of the second light homogenizing unit and are opposite; the first side face and the third side face are positioned on the same side of the central axis of the first dodging unit; the second side surface and the fourth side surface are positioned on the same side of the central axis of the first dodging unit;

the vertical distance between the first side and the third side is greater than 0, and/or the vertical distance between the second side and the fourth side is greater than 0.

10. The exposure system according to claim 8, wherein a vertical distance between the central axis of the first light unifying unit and the central axis of the second light unifying unit is 0.1mm or more and 0.3mm or less.

11. A lithography machine comprising an exposure system according to any one of claims 1 to 10.

Technical Field

The embodiment of the invention relates to the lithography technology, in particular to an exposure system and a lithography machine.

Background

The microlithography technology in semiconductor manufacturing is to precisely project and expose a pattern on a mask plate onto a photoresist-coated silicon wafer by using an optical system. The exposure system comprises a photoetching lighting device, a mask plate, a projection objective and a workpiece table used for accurately aligning the silicon wafer. The lithographic illumination apparatus needs to provide a uniform rectangular field of view on the mask surface, and then project the pattern on the mask plate onto the silicon wafer through the projection objective for exposure. The dose of exposure needs to be controlled in order to accurately reproduce the feature size of the mask pattern on the silicon wafer.

Disclosure of Invention

The embodiment of the invention provides an exposure system and a photoetching machine, which are used for improving the linearity of an energy detector and improving the control precision of exposure dose.

In a first aspect, an embodiment of the present invention provides an exposure system, including: the light source, the coupling lens group, the dodging component, the relay lens group and the projection objective lens are sequentially arranged along an optical axis;

the exposure system further comprises an energy sensor and at least one energy detector, wherein the energy sensor is positioned on the image surface of the projection objective;

the light homogenizing assembly comprises a first light homogenizing unit and a second light homogenizing unit, the first light homogenizing unit is positioned between the coupling mirror group and the second light homogenizing unit, and a gap exists between the first light homogenizing unit and the second light homogenizing unit along the direction of an optical axis; the energy detector is positioned on one side of the light uniformizing assembly and faces the gap, and the energy detector is used for receiving light rays emitted from the gap and calibrating the energy sensor.

Optionally, the exposure system further includes at least one reflector disposed in one-to-one correspondence with the energy detectors, the reflector is located between the dodging assembly and the energy detectors in one-to-one correspondence with the reflector, and the reflector is configured to reflect light emitted from the gap to the energy detectors in one-to-one correspondence with the reflector.

Optionally, the width of the gap between the first light uniformizing unit and the second light uniformizing unit is greater than or equal to 0.05mm and less than or equal to 0.2 mm.

Optionally, the first dodging unit is symmetrical about a first dodging unit central axis, the second dodging unit is symmetrical about a second dodging unit central axis, and the first dodging unit central axis is collinear with the second dodging unit central axis;

the vertical distance between the surface of one side, facing the energy detector, of the first dodging unit and the energy detector is smaller than or equal to the vertical distance between the surface of one side, facing the energy detector, of the second dodging unit and the energy detector.

Optionally, the number of energy detectors is 2-4.

Optionally, the exposure system comprises two of the energy detectors, a first energy detector and a second energy detector respectively; the first energy detector and the second energy detector are respectively positioned at two opposite sides of the central axis of the first dodging unit and the central axis of the second dodging unit.

Optionally, the exposure system includes four energy detectors, and the four energy detectors are uniformly distributed around the central axis of the first light uniformizing unit and the central axis of the second light uniformizing unit.

Optionally, the first dodging unit is symmetrical about a first dodging unit central axis, the second dodging unit is symmetrical about a second dodging unit central axis, the first dodging unit central axis is parallel to the second dodging unit central axis, and a vertical distance between the first dodging unit central axis and the second dodging unit central axis is greater than 0;

the vertical distance between the surface of one side, facing the energy detector, of the first dodging unit and the energy detector is smaller than or equal to the vertical distance between the surface of one side, facing the energy detector, of the second dodging unit and the energy detector.

Optionally, the first dodging unit comprises a first side surface and a second side surface parallel to the central axis of the first dodging unit and opposite to each other; the second light homogenizing unit comprises a third side surface and a fourth side surface which are parallel to the central axis of the second light homogenizing unit and are opposite; the first side face and the third side face are positioned on the same side of the central axis of the first dodging unit; the second side surface and the fourth side surface are positioned on the same side of the central axis of the first dodging unit;

the vertical distance between the first side and the third side is greater than 0, and/or the vertical distance between the second side and the fourth side is greater than 0.

Optionally, a vertical distance between the central axis of the first light uniformizing unit and the central axis of the second light uniformizing unit is greater than or equal to 0.1mm and less than or equal to 0.3 mm.

In a second aspect, an embodiment of the present invention provides a lithography machine including the exposure system according to the first aspect.

The embodiment of the invention provides an exposure system, which comprises a light homogenizing assembly and at least one energy detector, wherein the light homogenizing assembly comprises a first light homogenizing unit and a second light homogenizing unit which are arranged at intervals, the energy detector receives light emitted from a gap between the first light homogenizing unit and the second light homogenizing unit, and the energy distribution received by the energy detector is relatively uniform because the light received by the energy detector is subjected to light homogenizing treatment of the first light homogenizing unit, so that the linearity of the energy detector is improved, and the control precision of exposure dose is improved. It will be appreciated that the light rays are typically reflected multiple times inside the light unifying unit (e.g., the first and second light unifying units) for the purpose of light unifying. Therefore, the light ray can only enter the light incident surface (one end of the light uniformizing unit) of the light uniformizing unit and correspondingly exits the light exiting surface (the other end of the light uniformizing unit) of the light uniformizing unit, and thus the light ray cannot propagate at the part other than the light incident surface and the light exiting surface of the light uniformizing unit. For example, the light cannot exit from the light unifying unit to the outside thereof at the middle portion of the light unifying unit. In the embodiment of the invention, the gap is arranged between the first light homogenizing unit and the second light homogenizing unit, the light after the light homogenizing treatment of the first light homogenizing unit is emitted to the gap from the light emitting surface of the first light homogenizing unit, and the light emitted from the gap can be detected by the energy detector.

Drawings

Fig. 1 is a schematic structural diagram of an exposure system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a portion of the exposure system shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a portion of the structure of the exposure system shown in FIG. 2;

FIG. 4 is a schematic cross-sectional view of a portion of another exposure system according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a portion of another exposure system according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a portion of another exposure system according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of another exposure system according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a portion of the structure of the exposure system shown in FIG. 7;

FIG. 9 is a schematic cross-sectional view of a portion of another exposure system according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of another exposure system according to an embodiment of the present invention;

FIG. 11 is a schematic cross-sectional view of a portion of the structure of the exposure system shown in FIG. 10;

FIG. 12 is a schematic diagram of another exposure system according to an embodiment of the present invention;

FIG. 13 is a cross-sectional view of a portion of the structure of the exposure system shown in FIG. 12.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a schematic structural diagram of an exposure system according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a part of the exposure system shown in fig. 1, and referring to fig. 1 and fig. 2, the exposure system includes a light source 101, a coupling lens group 102, a light uniformizing assembly 103, a relay lens group 104, and a projection objective 105, which are sequentially arranged along an optical axis (shown by a dotted line in fig. 1). The light emitted from the light source 101 passes through the coupling lens group 102 and irradiates the light receiving surface of the light uniformizing assembly 103, and optionally, the light receiving surface of the light uniformizing assembly 103 is located on the focal plane of the coupling lens group 102. After light is homogenized by multiple reflections in the light homogenizing assembly 103, a uniform illumination area is formed, and a uniform illumination field with a certain Numerical Aperture (NA) is formed by the relay lens group 104. The uniform illumination field illuminates the image on the reticle and then exposes a line at the image plane of the projection objective 105.

The exposure system further comprises an energy sensor 106 and at least one energy detector 107, the energy sensor 106 being located on the image plane of the projection objective 105. The illumination at the image plane of the projection objective 105 can be read by an energy sensor 106. The light unifying assembly 103 comprises a first light unifying unit 1031 and a second light unifying unit 1032, the first light unifying unit 1031 is located between the coupling mirror group 102 and the second light unifying unit 1032, a gap exists between the first light unifying unit 1031 and the second light unifying unit 1032 in the optical axis direction, an energy detector 107 is located at one side of the light unifying assembly 103 and faces the gap, and the energy detector 107 is used for receiving light rays emitted from the gap and calibrating the energy sensor 106. The energy detector 107 can monitor the illumination of the image plane of the projection objective 105 on-line during the exposure process, and control the exposure dose based on the illumination.

The embodiment of the invention provides an exposure system, which comprises a light homogenizing assembly and at least one energy detector, wherein the light homogenizing assembly comprises a first light homogenizing unit and a second light homogenizing unit which are arranged at intervals, the energy detector receives light emitted from a gap between the first light homogenizing unit and the second light homogenizing unit, and the energy distribution received by the energy detector is relatively uniform because the light received by the energy detector is subjected to light homogenizing treatment of the first light homogenizing unit, so that the linearity of the energy detector is improved, and the control precision of exposure dose is improved.

Optionally, referring to fig. 1 and fig. 2, the light unifying assembly 103 may further include a light unifying unit support structure 1, the light unifying unit support structure 1 may support the first light unifying unit 1031 and the second light unifying unit 1032, and a light through hole may be opened on the light unifying unit support structure 1, so that the light exits from the light unifying unit support structure 1 to the outside of the light unifying unit support structure 1 so as to be received by the energy detector 107. The first light uniformizing unit 1031 and the second light uniformizing unit 1032 are both quartz rods, and the end face sizes of the first light uniformizing unit 1031 and the second light uniformizing unit 1032 are both 8mm-35mm (inclusive). In general, the end face of the quartz rod is rectangular, and the size of the end face refers to the side length of the rectangle. The lengths of the first light unifying unit 1031 and the second light unifying unit 1032 are both 200mm-400mm (inclusive).

Optionally, referring to fig. 2, the exposure system further includes at least one mirror 2 disposed in one-to-one correspondence with the energy detector 107, the mirror 2 is located between the dodging assembly 103 and the energy detector 103 in one-to-one correspondence with the mirror 2, and the mirror 2 is configured to reflect the light emitted from the gap to the energy detector 107 in one-to-one correspondence with the mirror 2. The exposure system provided by the embodiment of the invention also comprises the reflecting mirror 2, and the reflecting mirror 2 prevents large-angle light rays from directly irradiating the detection surface of the energy detector 107, so that the linearity of the energy detector 107 is further improved.

Alternatively, referring to fig. 2, a width W of a gap between the first light unifying unit 1031 and the second light unifying unit 1032 is greater than or equal to 0.05mm and less than or equal to 0.2 mm. If the width W of the void is too small, then the energy exiting the void is too small (less energy exiting the void when less light exits the void), and the energy detector 107 receives too little energy; if the width W of the gap is too large, too much energy is emitted from the gap (more energy is emitted from the gap when more light is emitted from the gap), and the energy loss is too large. In the embodiment of the invention, the width W of the gap is set to be greater than or equal to 0.05mm and less than or equal to 0.2mm, so that the energy detector 107 can receive energy with sufficient intensity within an allowable energy loss range.

FIG. 3 is a schematic cross-sectional structure diagram of a partial structure of the exposure system shown in FIG. 2, referring to FIG. 1, FIG. 2 and FIG. 3, the first dodging unit 1031 is symmetrical about a first dodging unit center axis L, the second dodging unit 1032 is symmetrical about a second dodging unit center axis L, the first dodging unit center axis L is collinear with the second dodging unit center axis L. the cross-sectional area of the first dodging unit 1031 perpendicular to the first dodging unit center axis L is equal to the cross-sectional area of the second dodging unit 1032 perpendicular to the second dodging unit center axis L. that is, the first dodging unit 1031 and the second dodging unit 1032 are disposed directly opposite each other. the perpendicular distance between the surface of the first dodging unit 1031 facing the energy detector 107 and the energy detector 107 is equal to the perpendicular distance between the surface of the second dodging unit 1032 facing the energy detector 107 and the energy detector 107. in the schematic cross-sectional structure diagram shown in FIG. 3, the first dodging unit 1031 and the second dodging unit L are coincident with the first dodging unit center axis 389, the second dodging unit center axis L may be larger than the perpendicular to the second dodging unit center axis 3526.

Table 1 linearity measurements of an energy detector in an exposure system provided in the prior art

Attenuator gear	ED gain factor	Degree of linearity
			100％	615.9	4.46％
75％	603.5	2.36％
			50％	579.3	-1.75％
25％	559.7	-5.07％

Table 1 shows the linearity measurement of an energy detector in an exposure system provided in the prior art, in which the energy detector is located before a dodging assembly, the energy detector receives light that has not been subjected to any dodging, and the energy distribution of the light that has not been subjected to the dodging is uneven, resulting in poor linearity of the energy detector, which is susceptible to the position of a light source (for example, a mercury lamp). Generally, an attenuator may be provided in front of the light source for adjusting the intensity of light striking the set of coupling mirrors. "100%" means that the attenuator transmits 100% of the energy of the light source, "75%" means that the attenuator transmits 75% of the energy of the light source, "50%" means that the attenuator transmits 50% of the energy of the light source, and "25%" means that the attenuator transmits 25% of the energy of the light source. The "ED gain factor" characterizes the voltage on the energy detector versus illumination. The linearity represents the linearity of the energy detector, and the closer the value of the linearity is to 0, the better the linearity of the energy detector is. When the attenuator stage is 100%, the ED gain coefficient is 615.9, and the linearity is 4.46% (the average of ED gain coefficients corresponding to 100% of the attenuator stage, 75% of the attenuator stage, 50% of the attenuator stage, and 25% of the attenuator stage) isThe linearity corresponding to 100% of the attenuator stage is). The calculation of the linearity for 75%, 50% and 25% attenuator steps and the line for 100% attenuator stepThe calculation process of the sex degree is similar and is not described in detail herein.

Table 2 linearity measurements of an energy detector in an exposure system according to an embodiment of the invention

Attenuator gear	ED gain factor	Degree of linearity
			100％	709.9	1.42％
75％	703.1	0.45％
			50％	695.8	-0.60％
25％	691.1	-1.27％

Table 2 shows measured values of linearity of an energy detector in an exposure system according to an embodiment of the present invention, in which, as shown in fig. 1, fig. 2, and fig. 3, the energy detector receives light emitted from a gap between a first light uniformizing unit and a second light uniformizing unit, and since the light received by the energy detector has been subjected to the light uniformizing treatment by the first light uniformizing unit, the energy distribution received by the energy detector is relatively uniform, so that the linearity of the energy detector is improved, and the control accuracy of exposure dose is improved. As can be seen from Table 2, the linearity for the attenuator steps of 100%, 75%, 50% and 25% are 1.42%, 0.45%, -0.6% and-1.27%, respectively. Whereas the linearity for the attenuator steps of 100%, 75%, 50% and 25% in Table 1 are 4.46%, 2.36%, -1.75% and-5.07%, respectively. The linearity values in table 2 are closer to 0 compared to table 1, and the energy detector provided by the embodiment of the present invention has better linearity compared to the prior art.

Optionally, referring to fig. 2, the exposure system includes one energy detector 107, in other embodiments, a plurality of energy detectors 107 may be further provided, the energy detectors 107 are used for simultaneously detecting energy, and the average value of the energy detectors 107 is used for characterization, so that the influence of temperature drift of the energy detectors 107 on the detection result can be individually reduced, and thus the linearity of the energy detectors 107 is improved.

Optionally, the number of energy detectors 107 is 2-4.

Fig. 4 is a schematic cross-sectional structure diagram of a partial structure of another exposure system according to an embodiment of the present invention, and referring to fig. 4, a first light uniformizing unit 1031 and a second light uniformizing unit 1032 are disposed opposite to each other, the exposure system includes two energy detectors 107, namely, a first energy detector 1071 and a second energy detector 1072, the first energy detector 1071 and the second energy detector 1072 are disposed on two opposite sides of a central axis L1 of the first light uniformizing unit and a central axis L2 of the second light uniformizing unit, respectively.

FIG. 5 is a schematic cross-sectional view of a portion of another exposure system according to an embodiment of the present invention, and referring to FIG. 5, a first dodging unit 1031 and a second dodging unit 1032 are disposed opposite to each other, the exposure system includes three energy detectors 107, a first energy detector 1071, a second energy detector 1072 and a third energy detector 1073, the first energy detector 1071 and the second energy detector 1072 are disposed on opposite sides of a first dodging unit central axis L1 and a second dodging unit central axis L2, respectively, and the third energy detector 1073 is disposed adjacent to both the first energy detector 1071 and the second energy detector 1072.

FIG. 6 is a schematic cross-sectional view of a partial structure of another exposure system according to an embodiment of the present invention, and referring to FIG. 6, a first light uniformizing unit 1031 and a second light uniformizing unit 1032 are disposed opposite to each other, the exposure system includes four energy detectors 107, the four energy detectors 107 are uniformly distributed around a first light uniformizing unit central axis L1 and a second light uniformizing unit central axis L2, the four energy detectors 107 are respectively a first energy detector 1071, a second energy detector 1072, a third energy detector 1073 and a fourth energy detector 1074, the first energy detector 1071 and the second energy detector 1072 are respectively disposed at two opposite sides of the first light uniformizing unit central axis L1 and the second light uniformizing unit central axis L2, the third energy detector 1073 and the fourth energy detector 1074 are respectively disposed at two opposite sides of the first light uniformizing unit central axis L1 and the second light uniformizing unit central axis L2, the first energy detector 1071 and the second energy detector 1072 are respectively adjacent to the third energy detector 1073, and the first energy detector 1071 and the second energy detector 1072 are respectively adjacent to the fourth energy detector 1074.

Fig. 7 is a schematic structural diagram of another exposure system according to an embodiment of the present invention, and fig. 8 is a schematic structural diagram of a cross-section of a partial structure of the exposure system shown in fig. 7, and referring to fig. 7 and 8, a first light uniformizing unit 1031 is symmetrical about a first light uniformizing unit central axis L1, a second light uniformizing unit 1032 is symmetrical about a second light uniformizing unit central axis L2, and a first light uniformizing unit central axis L1 is collinear with a second light uniformizing unit central axis L2, a perpendicular distance between a side surface of the first light uniformizing unit 1031 facing the first energy detector 1071 and the first energy detector 1071 is smaller than a perpendicular distance between a side surface of the second light uniformizing unit 1032 facing the first energy detector 1071 and the first energy detector 1071, a perpendicular distance between a side surface of the first light uniformizing unit 1031 facing the second energy detector 1072 and the second energy detector 1072 is smaller than a perpendicular distance between a side surface of the second light uniformizing unit 1032 facing the second energy detector 1072 and the second energy detector 1072.

Optionally, referring to fig. 7, the exposure system further includes at least one mirror 2 disposed in one-to-one correspondence with the energy detector 107, the mirror 2 is located between the dodging assembly 103 and the energy detector 103 in one-to-one correspondence with the mirror 2, and the mirror 2 is configured to reflect the light emitted from the gap to the energy detector 107 in one-to-one correspondence with the mirror 2. For the sake of clarity, the two mirrors 2 are named first mirror 21 and second mirror 22. The first reflecting mirror 21 is disposed corresponding to the first energy detector 1071, and reflects the light emitted from the gap to the first energy detector 1071. The second reflector 22 is positioned in correspondence with the second energy detector 1072 for reflecting light exiting the gap to the second energy detector 1072.

Alternatively, referring to FIG. 8, the exposure system includes two energy detectors 107, a first energy detector 1071 and a second energy detector 1072, the first energy detector 1071 and the second energy detector 1072 being located on opposite sides of the first dodging unit central axis L1 and the second dodging unit central axis L2, respectively, since the upper side of the first dodging unit 1031 (the side adjacent to the first energy detector 1071 is the upper side) is offset a distance from the upper side of the second dodging unit 1032, the lower side of the first dodging unit 1031 (the side adjacent to the second energy detector 1072 is the lower side) is offset a distance from the lower side of the second dodging unit 1032, light may exit from the positions where the upper and lower sides of the first and second dodging units 1031 and 1032 are offset from each other, if the first and second dodging units 1031 and 1032 are not offset from each other, the width of the gap between the first and second dodging units 1031 is susceptible to thermal expansion, thus the energy detector 107 is not susceptible to linear expansion of the first and contraction of the energy received by the first dodging unit 1031, and the cold contraction detector 1072 is not susceptible to thermal expansion of the first dodging unit 1032.

Fig. 9 is a schematic cross-sectional structure of a partial structure of another exposure system provided in an embodiment of the present invention, and referring to fig. 9, the exposure system includes four energy detectors 107, the four energy detectors 107 are uniformly distributed around a first light homogenizing unit central axis L1 and a second light homogenizing unit central axis L2, the four energy detectors 107 are respectively a first energy detector 1071, a second energy detector 1072, a third energy detector 1073 and a fourth energy detector 1074, the first energy detector 1071 and the second energy detector 1072 are respectively located on two opposite sides of the first light homogenizing unit central axis L1 and the second light homogenizing unit central axis L2, the third energy detector 1073 and the fourth energy detector 1074 are respectively located on two opposite sides of the first light homogenizing unit central axis L1 and the second light homogenizing unit central axis L2, the first energy detector 1071 and the second energy detector 1072 are respectively adjacent to the third energy detector 1073, the first energy detector 1071 and the second energy detector 1072 are respectively located adjacent to the third energy detector 1073, the first energy detector 1071 and the second energy detector 1072 are respectively adjacent to the right side of the first light homogenizing unit 1032, the first energy detector 1071 and the second energy detector 1072 are respectively located on the left side of the adjacent to the first light homogenizing unit 1032, the left side of the first energy homogenizing unit 1032, the first energy detector 1031 and the right side of the second energy homogenizing unit 1032, the first energy detector 1031, the second energy detector 1031 is located on the right side of the adjacent to the second energy homogenizing unit 1032, the right side of the first energy homogenizing unit 1032, the adjacent to the right side of the homogenizing unit 1032, the first energy detector 1031 unit 1032 is located on the right side of the homogenizing unit 1032, the homogenizing unit 1032 is located on the right side of the homogenizing unit 1032, the homogenizing unit 1032.

Fig. 10 is a schematic structural diagram of another exposure system provided by an embodiment of the present invention, and fig. 11 is a schematic structural diagram of a cross section of a partial structure of the exposure system shown in fig. 10, and referring to fig. 10 and fig. 11, a first light uniformizing unit 1031 is symmetrical with respect to a first light uniformizing unit central axis L1, a second light uniformizing unit 1032 is symmetrical with respect to a second light uniformizing unit central axis L2, a first light uniformizing unit central axis L1 is parallel to a second light uniformizing unit central axis L2, and a vertical distance between the first light uniformizing unit central axis L1 and the second light uniformizing unit central axis L2 is greater than 0, that is, the first light uniformizing unit central axis L1 is staggered with the second light uniformizing unit central axis L2 by a certain distance.

Alternatively, referring to fig. 10 and 11, the first dodging unit 1031 includes a first side 31 (upper side surface of the first dodging unit 1031) and a second side 32 (lower side surface of the first dodging unit 1031) parallel to and opposite the first dodging unit center axis L1, the second dodging unit 1032 includes a third side 33 (upper side surface of the second dodging unit 1032) and a fourth side 34 (lower side surface of the second dodging unit 1032) parallel to and opposite the second dodging unit center axis L2, the first side 31 and the third side 33 are located on the same side of the first dodging unit center axis L1, the second side 32 and the fourth side 34 are located on the same side of the first dodging unit center axis L1, a vertical distance between the first side 31 and the third side 33 is greater than 0, and a vertical distance between the second side 32 and the fourth side 34 is greater than 0.

Alternatively, referring to fig. 10 and 11, the vertical distance between the side surface of the first light homogenizing unit 1031 facing the energy detector 107 and the energy detector 107 is greater than or equal to the vertical distance between the side surface of the second light homogenizing unit 1032 facing the energy detector 107 and the energy detector 107, that is, the energy detector 107 is disposed at the side of the first side surface 31 away from the first light homogenizing unit central axis L1, the arrangement is based on the consideration that the light is transmitted from the first light homogenizing unit 1031 to the second light homogenizing unit 1032, the light can be emitted from the positions where the upper sides of the first light homogenizing unit 1031 and the second light homogenizing unit 1032 are staggered from each other because the first side surface 31 is higher than the third side surface 33, and the light emitted from the first light homogenizing unit 1031 and the second light homogenizing unit 1032 is not emitted from the positions where the lower sides of the first light homogenizing unit 1031 and the second light homogenizing unit 1032 are staggered from each other because the second side surface 32 is higher than the fourth side surface 34.

Alternatively, referring to fig. 10 and 11, the vertical distance H between the first and second light unifying unit central axes L1 and L2 is greater than or equal to 0.1mm and less than or equal to 0.3mm, if H is too small, the energy emitted from the position where the first and second light unifying units 1031 and 1032 are staggered with each other is too small, the energy received by the energy detector 107 is too small, and if H is too large, the energy emitted from the position where the first and second light unifying units 1031 and 1032 are staggered with each other is too much, the energy loss is too large.

Fig. 12 is a schematic structural diagram of another exposure system provided by an embodiment of the invention, fig. 13 is a schematic structural diagram of a cross-section of a partial structure of the exposure system shown in fig. 12, referring to fig. 12 and fig. 13, the first light unifying unit 1031 includes a first side surface 31 (an upper side surface of the first light unifying unit 1031) and a second side surface 32 (a lower side surface of the first light unifying unit 1031) parallel to the first light unifying unit central axis L1 and opposite to each other, the second light unifying unit 1032 includes a third side surface 33 (an upper side surface of the second light unifying unit 1032) and a fourth side surface 34 (a lower side surface of the second light unifying unit 1032) parallel to the second light unifying unit central axis L2 and opposite to each other, the first side surface 31 and the third side surface 33 are located on the same side of the first light unifying unit central axis L1, the second side surface 32 and the fourth side surface 34 are located on the same side of the first light unifying unit central axis L1, a vertical distance between the first side surface 31 and the third side surface.

Alternatively, referring to fig. 12 and 13, the perpendicular distance between the side surface of the first light unifying unit 1031 facing the energy detector 107 and the energy detector 107 is greater than or equal to the perpendicular distance between the side surface of the second light unifying unit 1032 facing the energy detector 107 and the energy detector 107, that is, the energy detector 107 is disposed at the side of the first side surface 31 away from the first light unifying unit central axis L1 in other embodiments, a plurality of energy detectors 107 may be disposed, for example, the energy detector 107 is disposed at the side of the second side surface 32 away from the first light unifying unit central axis L1, or the energy detector 107 is disposed at the left side of the first light unifying unit 1031 and the right side of the first light unifying unit 1031, which is not limited by the embodiments of the present invention.

In some alternative embodiments, the first side 31 and the third side 33 may also be arranged coplanar, and the perpendicular distance between the second side 32 and the fourth side 34 is larger than 0, correspondingly, the energy detector 107 may be arranged on the side of the second side 32 remote from the first light unifying unit central axis L1.

The embodiment of the invention also provides a photoetching machine which comprises the exposure system in any one of the embodiments. The energy detector has high linearity and high control precision of exposure dose, so the photoetching machine provided by the embodiment of the invention has higher-precision exposure dose control capability, thereby improving the exposure precision of the photoetching machine and improving the quality of an exposed product.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.