What are the main types of linear actuators used in photonics and precision motion systems?

Common types include screw-driven linear actuators (using ball, lead, or roller screws), linear motor stages (using iron-core or ironless linear motors), piezoelectric actuators, and belt-driven actuators. Screw-driven and piezo actuators are favored for high precision and stiffness, while linear motor and belt-driven systems are used when higher speed and longer travel are required.

How do ball screw, lead screw, and piezo linear actuators differ in performance and use cases?

Ball screw actuators use recirculating balls for low friction, high efficiency, and good positioning accuracy, suitable for medium to high load and duty cycles. Lead screw actuators have higher friction and lower efficiency but can offer self-locking behavior and smoother, quieter motion for lighter loads. Piezo actuators provide nanometer-scale resolution and high bandwidth over short strokes, ideal for fine alignment in optics and microscopy rather than long-travel positioning.

What key specifications should I consider when selecting a linear actuator for a photonics setup?

Critical parameters include stroke length, resolution, repeatability, bidirectional accuracy, maximum speed, and continuous/peak thrust or load capacity. You should also consider drive type (stepper, servo, DC), encoder type and resolution, mechanical interface (mounting pattern, shaft or stage), backlash or hysteresis, and environmental ratings such as vacuum compatibility or cleanroom suitability.

How do I compare the positioning performance of different linear actuators?

Compare specified resolution (smallest commanded increment), unidirectional and bidirectional repeatability, and positioning accuracy over the full stroke, ideally referenced to an external standard or encoder feedback. Also examine mechanical stiffness, pitch error of the screw (if applicable), straightness and flatness of motion, and the control electronics’ ability to implement closed-loop feedback and motion profiles relevant to your application.

What factors influence lead time, pricing, and customization options for linear actuators?

Lead time and cost are driven by travel length, screw or motor type, feedback options (incremental vs. absolute encoders), and special build requirements such as vacuum compatibility, non-magnetic materials, or integrated limit/home switches. Customizations can include tailored strokes, specific mounting patterns, integrated drives or controllers, cable lengths, and alternative lubricants, which typically extend manufacturing time compared to standard catalog units.

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Linear Actuator Solutions for Precision Motion

Ambient Temperature · AutoScrew.LR Optical Frame Adjuster

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Sold by: Zolix Instruments CO.,LTD Ships from: China

Specifications
Microstep Size (default Resolution):	0.02 um
Built-in Controller:	Yes
Travel Range:	6 mm
Accuracy (unidirectional):	0.01 um
Backlash:	N/A

Did You Know?

In many precision systems a linear actuator’s positioning accuracy is not limited by motor resolution but by leadscrew pitch error and backlash, which can easily add ±10–20 µm unless compensated. For a typical stepper-driven actuator with a 2 mm pitch screw and 200 steps/rev, microstepping at 1/16 yields a theoretical step size of 0.625 µm, but thermal expansion of a 200 mm steel screw over a 10°C change introduces about 24 µm of length change—often larger than the nominal resolution. This is why high‑end linear actuators for optics and metrology frequently use preloaded ball screws, low-CTE materials, and closed-loop encoders to achieve sub‑micron repeatability in real environments.

Related Resources

Frequently Asked Questions

A linear actuator is a device that converts input energy—typically electrical, pneumatic, or hydraulic—into controlled linear displacement. In electromechanical designs, a rotary motor drives a screw (ball screw, lead screw, or roller screw) or a linear motor coil, converting torque or electromagnetic force into straight-line motion with a defined stroke, speed, and thrust.

What Is a Linear Actuator?

A linear actuator converts rotary or electromagnetic energy into controlled linear displacement. In photonics and optics systems, a Linear Actuator is used to position lenses, mirrors, fiber couplers, stages, or samples along a single axis with repeatable accuracy. Depending on design, motion may be driven by lead screws, ball screws, piezo stacks, voice coils, or linear motors.

Typical Specifications and Performance

When evaluating a linear actuator on FindLight, engineers typically focus on travel range, resolution, load capacity, and speed. Common travel ranges span from a few hundred micrometers for piezo-driven actuators up to several hundred millimeters for screw- or motor-driven units. Resolution may vary from nanometer-scale for piezoelectric devices to a few micrometers for standard stepper-based designs.

Other key parameters include:

Load capacity: Maximum axial load (N or kg) that the linear actuator can support without excessive deflection or backlash.
Accuracy and repeatability: Positioning accuracy (μm) and bidirectional repeatability, critical for optical alignment and beam steering.
Drive type and motor: Stepper, DC servo, piezo, or voice-coil, often with integrated encoders for closed-loop feedback.
Speed and duty cycle: Maximum linear speed and allowable continuous operation for scanning or automated positioning tasks.
Mounting and form factor: Interface to optical tables, stages, or custom fixtures, plus cable management and environmental rating.

Use Cases in Light Transport Systems

In light transport and beam delivery setups, a linear actuator is used to tune optical path length, adjust focusing optics, align fiber inputs, or position attenuators and shutters. They also support sample translation in spectroscopy, interferometry, confocal microscopy, and laser machining, where stable, precise motion is required.

Buyer Guidance on FindLight

On FindLight, you can compare each linear actuator by stroke, resolution, load, and motor type to match system-level requirements such as stiffness, bandwidth, and positioning tolerance. Review datasheets for dimensional drawings, connector pinouts, and controller compatibility. Use the request-quote function to contact suppliers directly with your target specifications, integration constraints, and expected operating conditions. No registration is required to initiate a quote or technical inquiry, helping you quickly identify a linear actuator suitable for your photonics or optics project.