Double-telecentricity fixed-focus lens

Abstract

The invention discloses a double-telecentric fixed-focus lens, which is sequentially provided with a first single positive spherical lens, a second single positive spherical lens, a third single negative spherical lens, a fourth single negative spherical lens, The fifth single negative spherical lens, the sixth single positive spherical lens and the seventh single positive spherical lens; the second single positive spherical lens and the third single negative spherical lens are combined into cemented lenses; the fifth single negative spherical lens and the sixth single The combination of positive spherical lenses is cemented lenses; a diaphragm is arranged between the third single negative spherical lens and the fourth single negative spherical lens. The bi-telecentric fixed-focus lens of the present invention reduces the number of lenses, making the production cost lower; on the premise of less lenses, the structure is simpler, smaller in size, and lighter in weight. At the same time, the bi-telecentric fixed-focus lens also has The lens has the characteristics of small total length, large F value, and large maximum imaging surface.

Description

technical field [0001] The invention relates to an industrial lens for precision industrial detection, in particular to a telecentric fixed-focus lens. Background technique [0002] With the wide application of machine vision systems in the field of precision inspection, ordinary industrial lenses have been difficult to meet the inspection requirements. This is due to the following restrictive factors in ordinary optical lenses, 1. Errors caused by image deformation and viewing angle selection; 2. Inappropriate The uncertainty of the boundary caused by the interference of the light source will affect the accuracy of the measurement. [0003] In order to make up for the shortcomings of ordinary lenses and meet the needs of precision inspection, telecentric lenses came into being. Based on its unique optical characteristics: high resolution, ultra-wide depth of field, ultra-low distortion, and unique parallel light design, the telecentric lens can enlarge the image within a c...

AI Technical Summary

Problems solved by technology

[0004] However, telecentric lenses currently on the market are generally heavy in weight, large in size, and high in production costs, which makes it difficult for telecentric lenses to be popularized in industrial inspections.

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