Trapezoidal Fingerprint Prism
The trapezoidal fingerprint prism is a specially shaped right-trapezoidal optical prism that redirects the fingerprint-imaging path using total internal reflection. LED light enters the prism while a finger presses the acquisition surface. According to the description, fingerprint ridges contacting the glass reflect light, whereas air gaps at valleys allow light to escape, forming a bright/dark fingerprint image. The prism redirects this image onto a CMOS sensor for capture. Nontransmitting side faces are blackened to suppress stray light and improve image signal-to-noise ratio.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Optical Material | H-K9L / N-BK7 (K9 Optical Glass) |
| Overall Dimensions - Base Length [Common Stock Specifications; Customizable] | 22.5 mm |
| Dimensions - Height [Common Stock Specifications; Customizable] | 10.9 mm |
| Angular Tolerance | ±3′ (Arcminutes) |
| Dimensional Tolerance | ±0.05 ~ ±0.1 mm |
| Surface Quality [MIL‑PRF‑13830] | 40/20（MIL‑PRF‑13830） |
| Flatness [632.8nm] | λ/4 @632.8 nm |
| Clear Aperture Dimension | ≥90% |
| Chamfer - Dimensions | 0.1‑0.5 mm |
| Chamfer - Angle | 45° |
| Optical Coating | Visible AR on Collection/Entrance Faces; Blackened Sides; Reflecting Face Usually Uncoated, Uses Total Internal Reflection |
| Operating Wavelength Band [Visible Light; Fingerprint LED Light Source] | Visible Light 400-700 nm (Fingerprint LED Light Source) |
| Refractive Index [587.6nm；K9] | 1.5168（@587.6 nm，K9） |
Applications
Key Features
Datasheet
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