Via vincent write up on the new lens patent disclosure of SMEE
A patent filed by SMEE in 2018 showed SMEE's lens design for lithography equipment reduces processing manufacturing cost, increases numerical aperture, can be used for GHI three-wire band, increases the number of use cases for the projection system, improves the resolution of the projection.
Decrypt Shanghai Microelectronics New Type Lithography Machine Black Technology
Source: Aijiwei
# Patent decryption#
10-24 13:36
【Jiaqin Comment】Shanghai Microelectronics' patent for lithography projection objective lens, through the use of spherical lens design, reduces the manufacturing cost, increases the numerical aperture, and is suitable for the ghi three-line band. The applicable scene of the projection objective is expanded, and the resolution of the lithography machine is improved.
According to news from Jiwei, Shanghai Microelectronics recently held a new product launch conference and announced the launch of a new generation of large-field high-resolution advanced packaging lithography machines. At present, Shanghai Microelectronics has reached a sales agreement with a number of customers for a new generation of advanced packaging lithography machines, and the first one will be delivered within this year.
Optical lithography is a technology that uses light to project and copy mask patterns. The integrated circuit is made by a projection exposure device to image patterns with different mask patterns on the substrate to manufacture integrated circuits, thin-film magnetic heads, and liquid crystal displays. A series of structures such as boards, or micro-electromechanical systems. In the past few decades, the technology level of exposure equipment has been continuously developed to meet the needs of smaller line size, larger exposure area, higher reliability and productivity, and lower cost. However, the existing lithographic projection objective lenses still have problems such as small numerical aperture, low resolution, narrow applicable wavelength band, invariable numerical aperture, and high manufacturing cost of aspheric lenses.
To this end, Shanghai Microelectronics applied for an invention patent entitled "A lithographic projection objective and lithography machine" on December 30, 2018 (application number: 201811648523.1), and the applicant is Shanghai Microelectronics Equipment (Group) Company limited by shares.
Figure 1 Schematic diagram of lithography projection objective lens structure
1 is a schematic diagram of the structure of the lithographic projection objective proposed by the present invention, including a first lens group, a second lens group, and a third lens group, as well as a fourth lens group and a fifth lens arranged symmetrically with the above lens group about the aperture Group and sixth lens group. By adjusting the size of the aperture of the diaphragm, the numerical aperture of the lithography projection objective lens can be adjusted, thereby increasing the ability of the lithography projection objective lens to be suitable for different scenes. In addition, the focal length setting of each lens group can increase the numerical aperture of the lithography projection objective lens, and improve the resolution of the lithography projection objective lens.
The first lens group G1, the third lens group G3, the fourth lens group G4, and the sixth lens group G6 have positive refractive power, and the second lens group G2 and the fifth lens group G5 have negative refractive power. The optical power is equal to the difference between the image-side beam convergence and the object-side beam convergence, and it represents the ability of the optical system to deflect light. The greater the absolute value of the optical power, the stronger the bending ability to light, and the weaker the bending ability to light. When the refractive power is positive, the refraction of the light is convergent, otherwise it is divergent. The optical power can be used to characterize a certain refractive surface of a lens, or to characterize a certain lens, or it can be used to characterize a system formed by multiple lenses.
Each lens group and all lenses in the stop STOP are spherical lenses. Spherical lens refers to the constant curvature from the center to the edge of the lens. The two refractive surfaces of the spherical lens are spherical, while the curvature of the aspheric lens changes continuously from the center to the edge. Therefore, the spherical lens is relative to the aspheric lens. In terms of easier processing. The lenses in the embodiments of the present invention all adopt spherical lenses, which reduces the processing cost of the lens in the lithographic projection objective, shortens the processing period of the lens, and improves the assembly and adjustment efficiency of the lithographic projection objective.
In short, Shanghai Microelectronics' lithography projection objective lens patent, through the use of spherical lens design, reduces the processing and manufacturing costs, increases the numerical aperture, and is suitable for the ghi three-line band. The applicable scene of the projection objective is expanded, and the resolution of the lithography machine is improved.
Shanghai Microelectronics is committed to the R&D and production of high-end projection lithography machines for the semiconductor industry. With the ultimate service, high-end products are created, creating outstanding value, and providing customers with high-quality products and technical services all-weather, all-round and wholeheartedly. Facing the future, Shanghai Microelectronics will strive to grasp the historical opportunity of the rapid development of China's semiconductor industry.
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