Biconcave lens-Danyang Xinye Optical instrument Co., Ltd

Biconcave lens

The geometric construction of biconvex lens imaging is the same as that of convex lens imaging. From the top of the object, it also serves as two straight lines: one parallel to the main optical axis, passing through a biconcave lens and deflecting into a divergent light, returning this refracted light in the opposite direction to the main focus; Another optical center point passing through the lens, where these two lines intersect at a point, is the image of the object.

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DETAILS

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Index
material	BK7或UV fused silica
Focal length tolerance	±1% @589nm
design wavelength	589nm
decentration	≤3′
Outer diameter tolerance	+0/-0.1mm
Effective aperture	＞90% Central area
Center thickness tolerance	±0.1mm
Edge thickness	Standard value
finish	20/10（UVFS）/ 40/20（BK7）
Face shape (within the effective aperture)	≤ 1.5λ Optical power，λ/2 Irregularity（UVFS）
	≤ 1.5λ Optical power，λ/4 Irregularity（BK7）
chamfer	0-0.8mm ×45°±15°
Other materials, outer diameter, and focal length products can be customized by Xinye Technology according to needs

Specifications
Part No	Dia	Tc	Te	R1	R2	EFL	material
Part No	(mm)	(mm)	(mm)	(mm)	(mm)	(mm)	material
LMS-254-R857-R2500-BK7	25.4	4.12	3.5	85.7	-250	250	BK7
LMS-254-R1025-R3000-BK7	25.4	4.02	3.5	102.58	-300	300	BK7
LMS-254-R1266-R3220-BK7	25.4	3.89	3.5	126.66	-322	400	BK7
LMS-254-R1554-R3876-BK7	25.4	3.81	3.5	155.466	-387.6	500	BK7