Lens unit
The lens unit design with a cylindrical spacer and elastic member adjusts inter-lens distance to maintain focus stability by compensating for temperature-induced shifts, addressing the challenge of focus position instability in existing lens units.
JP2025181029APending Publication Date: 2025-12-11NIDEC INSTR CORP
Patent Information
- Application Number
- JP2024088766
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-12-11
Smart Images
Figure 2025181029000001_ABST
Abstract
To provide a lens unit capable of suppressing deviation of a focus position when being affected by heat.SOLUTION: A lens unit 100 includes a first lens barrel member 20, a second lens barrel member 30 held on an inner peripheral side of the first lens barrel member, a cylindrical spacer 40 disposed inside the first lens barrel member and made of a material having a linear expansion coefficient higher than those of the first lens barrel member and the second lens barrel member, and an annular elastic member 50 disposed inside the first lens barrel member. When a temperature of the lens unit increases, the spacer thermally expands in an optical axis direction to push the second lens barrel member toward an object side L1, and the elastic member is compressed in the optical axis direction to move the second lens barrel member toward the object side. When the temperature of the lens unit decreases, the spacer thermally contracts in the optical axis direction to restore the elastic member in the optical axis direction, and the second lens barrel member moves toward the image side L2 by the restoration of the elastic member in the optical axis direction.SELECTED DRAWING: Figure 2
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Citation Information
Patent Citations
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JP2003262777A
Lens unit
JP2024000240A