Imaging optical system and imaging device
The imaging optical system addresses chromatic aberration correction by employing a specific lens configuration with controlled sag amounts and Abbe numbers, enhancing productivity and reducing costs.
JP2026115281APending Publication Date: 2026-07-09NIDEC INSTR CORP
Patent Information
- Application Number
- JP2024231886
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-07-09
Smart Images
Figure 2026115281000001_ABST
Abstract
To provide an imaging optical system that can effectively correct chromatic aberration without increasing the amount of sag at the bonding surface of a cemented lens, and an imaging device equipped with such an imaging optical system. [Solution] The lens comprises a front group 110, an aperture 130, and a rear group 120, arranged in order from the object side to the image side. The front group 110 comprises a first group 111 and a second group 112, arranged in order from the object side to the image side. The second group 112 comprises a third lens 30 and a fourth lens 40 adjacent to the third lens 30 on the image side and positioned closest to the image. The rear group 120 comprises a cemented lens 75 positioned closest to the image. The Abbe number of the third lens 30 is ν21, the Abbe number of the fourth lens 40 is ν22, the sag amount of the object-side lens surface 71 of the seventh lens 70 is Sag71, and the effective radius of the object-side lens surface 71 of the seventh lens 70 is sd71. Then the following conditions apply: ν21 < 30.000, 44.000
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Citation Information
Patent Citations
Wide-angle lens and optical apparatus having this wide-angle lens
JP2011107425A