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LTPRHP3W series

3W LED pattern projectors

Opto Engineering® CATALOG

NEW: Infrared model now available

Overview

Models

Downloads

Tech info

Projection

Patterns

Resources

LTPRHP3W series features advanced and efficient LED projectors for structured light applications such as, quality control, 3D reconstruction, 3D profilometry, stereovision, planarity control, robot guidance for pick and place and alignment applications.

Unlike laser sources, which typically show poor line sharpness and power distribution as well as scattering, speckle and diffraction effects, LTPRHP3W pattern projectors integrate LED sources and precisely engraved patterns ensuring thinner lines, sharper edges and more homogeneous illumination.

LTPRHP3W series is available in different colors and features a wide selection of projection patterns (see PTPR series) which can be easily interchanged to project any kind of shape. Additionally, LTPRHP3W features built-in phase- adjustment for easy alignment of the pattern. Any C-mount optics can be interfaced to project areas with different sizes.

LTPRHP3W LED projectors integrate built-in electronics that control the current flow through the LED and can be easily tuned by the user.

KEY ADVANTAGES

LED technology for perfectly sharp edges
Thinner lines, sharper edges and more even illumination than lasers
Wide selection of projection patterns available (custom-made upon request)
Chrome-on-glass patterns with geometrical accuracy down to 2 μm
Compatible with any C-mount optics

Precise light intensity adjustment

Easy LED source replacement

LED PATTERN PROJECTORS

LTPRHP3W-x models featuring built in electronics with multi-turn trimmer for light intesity dimming and ≈ 3W power intensity.

LTPRHP3W models are designed for continuous mode and integrate built-in electronics that control the current flow through the LED.

LTPRHP3W models integrate a multi-turn trimmer for light intensity control.
The built-in electronics can be bypassed in order to directly drive the LED through an external controller.

	Lighting specifications			Electrical specifications					Mechanical specifications
Part number	Active area diameter	Light color, peak wavelength	Illuminance	Operating mode	Supply voltage	Power consumption	LED forward voltage typical (max)	Max pulse current	Mount	Diameter	Length

	(mm)		(klux)		(V)	(W)	(V)	(mA)		(mm)	(mm)
			1	2	3		4	6		6
LTPRHP3W-R	11	red, 625 nm	9	Continuous and strobe	12-24	4.5	2.4 (3)	2000	C	38.5	90.8	Quote
LTPRHP3W-G	11	green, 525 nm	14	Continuous and strobe	12-24	4.5	3.3 (4.0)	2000	C	38.5	90.8	Quote
LTPRHP3W-B	11	blue, 460 nm	3	Continuous and strobe	12-24	4.5	3.3 (4.0)	2000	C	38.5	90.8	Quote
LTPRHP3W-W	11	white, 6000 K	30	Continuous and strobe	12-24	4.5	2.8 (-)	2000	C	38.5	90.8	Quote
LTPRHP3W-IR850	11	IR, 850 nm	n.a.	Continuous and strobe	12-24	4.5	1.5 (2)	2000	C	38.5	90.8	Quote

Last update 15 Apr 2022

Notes

With a 35 mm lens, F/N 1.4 at 100 mm working distance without projection pattern at maximum driving current. Estimated value.
To pulse LTRPHP3W, models built-in electronics must be bypassed in order to drive the LED directly.
Tolerance ± 10%
At max forward current. Tolerance is ± 0.06V on forward voltage measurements
Max continuous LED driving current is supplied through the built-in electronics. No external controller is required.
At pulse width <= 10 ms and duty cycle <= 10%. Built-in electronics board must be bypassed (see tech info)
At 55 °C, 720mA.

Technical documents

Product user guide

pdf

LTPRHP3W Manual

pdf

LTPR pattern positioning

pdf

Safety warning UV/IR

pdf

Projection lens selection

Any C-mount optics for 2/3” sensors (11 mm image diagonal) can be interfaced with LTPRHP3W series to project areas with different sizes. Unless the projection optics introduces significant distortion, the shape of the projected pattern will preserve the features and aspect ratio of the engraved pattern.

The projected area dimensions will be “M” times the original dimensions of the pattern, where M is the optical magnification at which the selected projection lens is operating.

Telecentric lenses for 2/3” sensors can also be interfaced with LTPRHP3W models, thus providing telecentric projection of the pattern and enabling unparalleled performance in 3D measurement applications.

Below follows a list of the projection diameters (D) and the recommended projection distances (P.d.) achieved with different types of optics.

2-3″ C-mount lenses
P.D.	@50	@75	@100	@150	@200	@250	@300	@400	@500
	mm	mm	mm	mm	mm	mm	mm	mm	mm
Focal length	D (Projection diameter) (mm)
6 mm	81	127	172	264
8 mm	58 (*)	92	127	195	264	333
12 mm	35 (*)	58 (*)	81	127	172	218	264
16 mm		41 (*)	58 (*)	92 (*)	127	161	195	264	333
25 mm				55 (*)	77 (*)	99 (*)	121 (*)	165	209 (*)
35 mm						68 (*)	83 (*)	115	146

(*) = spacers may be needed to compensate back focal length

Standard C-mount lenses + LTRHP3W

Telecentric lenses
	TC23004	TC23007	TC23009	TC23016	TC23024	TC23036
P.d.(mm)	56.0	60.1	62.2	43.1	67.2	102.5
D.(mm)	5.5	8.3	11.0	20.8	31.4	45.2
	TC23048	TC23056	TC23064	TC23072	TC23080	TC23096
P.D.(mm)	132.9	157.8	181.8	226.7	226.7	278.6
D.(mm)	59.8	70.0	80.0	89.9	99.7	117.8

Bi-telecentric lenses + LTRHP3W

Pattern selection

The projection pattern can be easily interchanged by unscrewing the retaining ring that holds the pattern. The pattern outer diameter is 21 mm, while the active projection area is a circle of Ø 11 mm.

The pattern drawing could either cover the entire 11 mm diameter area or be of any shape inscribed within this area (such as a square whose side is 7.78mm or a 8.8x6.6mm rectangle). The projection accuracy depends both on the pattern manufacturing accuracy and the distortion of the projection optics mounted on the projector.

The edge sharpness of the projected pattern depends on both the lens resolution and the engraving technique: laser-engraved patterns (part numbers ending in “L”) or photolithography-engraved patterns (part numbers ending in “P”) can be chosen depending on the type of application.

Standard patterns

Custom-made patterns

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