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Flat Lights for Machine Vision

These highly homogeneous flat lights are used as backlighting and to create silhouettes around components to generate robust black-on-white contrast. Flat LED vision lights manufactured by wenglor ensure excellent brightness for high contrasts.

Illumination Methods

Flat Lights LBB & ZVZF

Illumination Methods Using Flat Lights

Flat lights are most commonly used in one of these illumination methods.

Back Lights

By using flat lights as a common back light illumination, it is possible to create sharp silhouettes in applications such as pick-and-place. Additionally, this illumination method can be used for the inspection through clear parts.

Brightfield

Flat lights are used as direct lighting for the examination of high-gloss surfaces. In the captured image, the surface appears as a mirror. By positioning a surface illumination in the reflected field of vision, faulty areas and markings in the area to be examined can be detected.

LBB & ZVZF Flat Lights

Flat lights for Machine Vision lighting applications are available in three different back light sources: white light, red light and infrared light. These flat lamps create a homogeneous and diffuse light area in several different sizes – from small area LED flat lights to large area LED flat lights. This machinevision backlight solution creates high intensity illumination in any industry using image processing!

The Depth of Field (DoF)

The Real Field of View (FoV)

The Parallax Effect

What Is the Parallax Effect?

Parallax is an effect experienced with industrial Machine Vision that relates to height as well as to how a light source is perceived by a camera. It appears when looking across an area from a single viewpoint.

The effects of the objects’ relative position to the camera are very important to understand in order to avoid parallax appearances. Common camera types use integrated calibration tools and telecentric lenses to correct this effect. With lighting, it can be adjusted with over-exposure in some instances.

1) Object 1 as captured with aperture f/8
2) Object 2 as captured with aperture f/8 creating the parallax effect
3) Object 2 as captured with aperture f/4 without the parallax effect

Which Effect Has the Inverse Square Law of Light?

The parallax effect as well causes a lack of homogeneity, which cannot be compensated. As light and distance follow the inverse square law of light, the back light for larger field of views require to be even brighter than small flat lights.

1) Objects directly under the camera: 100% brightness
2) Objects seen from a wider angle: less brightness

Which Working Distance Should Be Chosen?

We recommend to use a working distance (WD) of at least two times the largest diagonal (C) of the field of view (FoV).

WD > 2 × C

The Use of Saturation

LBB Flat Lights

LBB flat lights are used to illuminate areas with a luminuous field starting from 200 × 200 mm. Because space is very limited in industrial environments, the LBB flat light comes with 4 mm borders, mounting points around the entire perimeter and a huge range of sizes.

ZVZF Flat Lights

ZVZF flat lights are used to illuminate small areas with a luminuous field starting from 60 × 60 mm. They have a rugged housing with protection class IP67. Due to their extremely thin housing of only 20 mm and small borders of only 4 mm, these vision lights are perfectly suited to fit in hard-to-access industrial environments with limited spaces.

	Light Source	Sizes	Connection	Protection Class
LBB Flat Lights	White light Red light Infrared light	200 × 200 mm, 300 × 200 mm, 400 × 200 mm, 300 × 300 mm, 400 × 300 mm, 400 × 400 mm, 500 × 500 mm	M12 × 1; 5-pin	IP40
ZVZF3 & ZVZF4 Flat Lights	White light Infrared light	60 × 60 mm, 120 × 120 mm, 180 × 180 mm	M12 × 1; 4/5-pin	IP67

LBB Flat Lights
LBB Flat Lights	Light Source White light Red light Infrared light	Sizes 200 × 200 mm, 300 × 200 mm, 400 × 200 mm, 300 × 300 mm, 400 × 300 mm, 400 × 400 mm, 500 × 500 mm	Connection M12 × 1; 5-pin	Protection Class IP40
ZVZF3 & ZVZF4 Flat Lights
ZVZF3 & ZVZF4 Flat Lights	Light Source White light Infrared light	Sizes 60 × 60 mm, 120 × 120 mm, 180 × 180 mm	Connection M12 × 1; 4/5-pin	Protection Class IP67

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