The Telecentric View in Automated Inspection

In this episode, we cover why telecentric lenses are so important for manufacturing. Standard lenses distort size with distance, but telecentric lenses maintain the same magnification. We talk about why this true-to-scale accuracy is critical for things like reading text on curved surfaces or inspecting semiconductor wafers. We also look at Computar's new LensConnect series, which adds remote focus via I2C or USB so production lines don't have to stop for manual lens adjustments.

Episode highlights:

• How telecentric lenses fix perspective distortion to give a perfectly accurate view.
• Real-world uses, like reading optical characters on curved surfaces and measuring minute details on wafers.
• How Computar’s LensConnect series uses remote focus to speed up automated inspections without manual tweaking.
• What happens when you combine these lenses with AI, and how it shifts the role of human inspectors in quality control

Transcript

Speaker 1 Welcome to one thousand Tech Drive, your go to podcast for all things optics and surveillance technology. Each episode will take you on a journey through industry trends and dive into the innovative products from CBC America's Computar and Gantz brands. So, uh, today's deep dive synthesizes sources from Computar, Oculus Vision and Evident Scientific IMS to explore exactly how Telecentric lenses work.

Speaker 2 Yeah, and it is a pretty wild optical concept when you first hear about it.

Speaker 1 It totally is. We're also getting into the industries relying on them and how Computar's new LensConnect series offers a really major competitive business advantage for you.

Speaker 2 It's definitely a massive leap forward for, you know, industrial manufacturing.

Speaker 1 Okay, let's unpack this. I want to introduce the classic railroad track analogy here. Through standard lenses, parallel tracks appear to converge in the distance, right?

Speaker 2 But they just pinch together at the horizon.

Speaker 1 But through telecentric lenses, the tracks look exactly the same distance apart, regardless of how far away they are.

Speaker 2 Which feels, I mean, completely unnatural to the human eye.

Speaker 1 Yeah, it's like a literal visual glitch. So how does that actually work on a scientific level?

Speaker 2 Well, standard lenses, what we call N2 centric lenses have an angular field of view. So this creates parallax and perspective errors where closer objects appear larger.

Speaker 1 Which is just how our phone cameras are. You know, our eyes work exactly.

Speaker 2 But telecentric optics maintain consistent magnification regardless of distance. So they give a true to scale, completely flat impression of depth.

Speaker 1 So it basically strips away all perspective.

Speaker 2 Yeah, you're just getting absolute measurable reality because telecentric lenses eliminate those perspective distortions. They transition from just a neat optical trick to a totally mandatory industrial tool.

Speaker 1 Let me play devil's advocate for a second. Since standard lenses work fine for everyday use, why deal with the larger physical size and a higher cost of a telecentric lens?

Speaker 2 What's fascinating here is that in manufacturing, standard lenses definitely do not work fine.

Speaker 1 Oh, really?

Speaker 2 Yeah. The precision absolutely justifies the cost. Think about accurate OCR optical character recognition on curved pharmaceutical bottles.

Speaker 1 Right? Because a standard lens would warp the text at the edges of the curve.

Speaker 2 You got it. But the telecentric lens reads it flat or takes semiconductor wafers. Manufacturers have to measure these microscopic circuit traces.

Speaker 1 And if the perspective stretches that image even a tiny bit.

Speaker 2 The whole computer chip is ruined. Exactly. Plus, these lenses give robotic pick and place arms. Subpixel edge detection.

Speaker 1 Wow. Subpixel.

Speaker 2 Yeah. Which is critical when you're moving tiny components at incredible speeds.

Speaker 1 Okay, I see why they need them, but there's a catch, right? Because manually adjusting these highly precise lenses on a busy factory floor must really slow down inspection workflows.

Speaker 2 Oh, totally. If you have to shut down a machine just to have a human manually twist a focus ring, you're killing your efficiency.

Speaker 1 Here's where it gets really interesting. Computar's new LensConnect Telecentric series. The TEC-ML series actually features remote focus operation via 12C or USB.

Speaker 2 Which is such a huge deal for the industry. You're looking at magnification from oh 0.25× to 2.0× a consistent 6.5 F number and 2.74µ pixel resolution support.

Speaker 1 Okay. Hold on, break the specs down for me. The 6.5 F number.

Speaker 2 That basically just means it lets in the exact right amount of light to freeze high speed motion without blurring.

Speaker 1 Gotcha. And the 2.74 four micron pixels.

Speaker 2 That means it handles microscopic details on ultra high res sensors flawlessly. But the real genius is that the optical design maintains perfect telecentricity, even while the focus shifts.

Speaker 1 Wait, so you can adjust focus remotely without touching the lens and the perspective never warps?

Speaker 2 Exactly. It completely streamlines industrial workflows, radically increases inspection speed, and improves measurement accuracy.

Speaker 1 So what does this all mean ultimately for you listening, it means achieving faster, flawlessly accurate automated inspections.

Speaker 2 Yeah, it completely removes the human bottleneck on the factory floor.

Speaker 1 Which is incredible.

Speaker 2 It really is. But it leaves you with a pretty wild thought. If remote seokj is telecentric, lenses can achieve perfect hands-free subpixel accuracy. How will pairing these optics with self-learning AI eventually completely redefine the role of human quality control inspectors?