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L086-DEVKIT

Brief

L086 is 6.8-120mm focal length (18x) motorized zoom lens is designed for 1/1.8" image sensors, has zoom/focus/iris functions, designed for 8M sensors.

IMG_4383_r_wiki.jpg

Specifications

Optics

Image sensor 1/1.8" Effective image area > 9.2mm
Focal distance 6.8 ~ 120mm / ±5%
Aperture f/1.6 ~ f/4.1
Focus range
  • WIDE: 1.0m - infinity
  • TELE: 2.0m - infinity

Field of view (D=8.81mm)

  • WIDE: 65.3°
  • TELE: 4.2°

Distortion

  • WIDE: 0.4%
  • TELE: 0.11%

Recommended image sensor

IMX344

Mechanics

Flange back (FB, see diagram below)

+0.374 (in glass t=0.3 IRCF)

Lens zoom structure The stepper motor is directly connected to the screw
Lens focusing structure The stepper motor is directly connected to the screw
Lens size
  • Length: 90.4mm
  • Width: 45mm
  • Height: 45mm
  • Front end diameter:  40.5mm

In order to accommodate different image sensors, the focal distance is set back by FB distance. The actual distance for a specific sensor has to be calculated and spacers used. If the image plane is not set correctly, focus irregularities in the projected picture are expected.

fb.png

Motor specifications

Screw pitch 0.4mm
Spiral rotation direction Right
Rated voltage 5.0 VDC
Coil resistance 60Ω ± 10% / phase (T=25°C)
Phase count 2
Step angle 18° / step
Max start frequency 800 PPS/min @ at 5.0 VDC
Max operating frequency 1200 PPS/min @ 5.0 VDC
Pull torque 2.8 gf-cm min (at 480 PPS @ 5.0 VDC)

Push torque

3.8 gf-cm min (at 480 PPS @ 5.0 VDC)
Operating temperature range -30°C ~ +70°C

Position alignment sensor PI

Model number RPI-222 / ROHM

Iris

Driving resistance 120Ω ± 10% (T=20°C, 65% RH)
Braking resistance 120Ω ± 10% (T=20°C, 65% RH)
Close to open operation 3.5 ~ 5.0V
Open to close operation 0 ~ 0.8V

IR switch

Coil resistance 22.5 ± 10% (T=20°C)
Operation voltage

4.5 ~ 5.0V

Current consumption

144 ~ 200mA

Filter thickness

0.3mm

Switching time

200 ~ 500ms

Filters
  • Open air
  • 380 ~ 650nm (TAVG >90%)

Zoom-Focus curve diagram

exported2_L086.png

Wiring

Lens signals routed by 43 pin 0.5mm pitch FFC cable. Contacts facing top.

pinout_36.png

Nr Function
1 ZOOM1 MOTOR B-
2 ZOOM1 MOTOR A+
3 ZOOM1 MOTOR B+
4 ZOOM1 MOTOR A-
5 ZOOM2 MOTOR B-
6 ZOOM2 MOTOR A+
7 ZOOM2 MOTOR B+
8 ZOOM2 MOTOR A-
9 ZOOM1 PI(ANODE)
10 ZOOM1 PI(CATHODE EMITTER)
11 ZOOM1 PI(COLLECTOR)
12 GND
13 IRIS DRIVE+
14 GND
15 IRIS HALL-
16 IRIS BIAS-
17 IRIS HALL+
18 IRIS BIAS+
19 GND
20 IRIS DRIVE-
21 IRIS CONT-
22 IRIS CONT+
23 IR-
24 IR+
25 FOCUS PI(CATHODE EMITTER)
26 FOCUS PI(COLLECTOR)
27 FOCUS PI(ANODE)
28 ZOOM2 PI(CATHODE EMITTER)
29 ZOOM2 PI(COLLECTOR)
30 ZOOM2 PI(ANODE)
31 TEMP COM
32 TEMP OUT
33 FOCUS MOTOR B-
34 FOCUS MOTOR A+
35 FOCUS MOTOR B+
36 FOCUS MOTOR A

Dimensions

L086_dimensions.png

Detailed 3D model is hosted on GitHub 3D models repository

 

Controller SCE2-L086

SCE2-L086 is inexpensive dual layer application board designed to match lens FFC routing and topology based on SCE2-M 4 channel stepper motor controller module. Controller is based on STM32 microprocessor and TMC2300 motor drivers. Modern stepper motor drivers allow wide range of operation and suitable from operating NEMA17 to micro motor. Control logic is based on CNC control firmware GRBL.

SCE2-L086_wiki.jpg

PCB revisions

RevA
  • Initial lens tests
  • Simplified DC iris control (on/off)
  • For testing use 44pin FFC
  • Check IR filter control with trinamic
  • Check actual homing, fine tune GRBP parameters
  • Check if FFC connector numbering matches cable
  • Add I2C thermometer
RevB
  • Refine design
  • Use new 43 pin FFC connector
  • Replace internal I2C thermometer with slave connector
  • Use NTC with on-board ADC for temperature reading
RevC
  • Replaced 43 pin FFC connector to 36 pin
  • Updated some resistor values

Features

  • USB and 3.3V UART control
  • 4 axis motion controller
  • Fully integrated design
  • Powered by USB 5V rail
  • I2C slave for external sensors and controllers (Functionality is determined by firmware)
  • Linear path interpolation

Dimensions

SCE2_L086_controller_dimensions.png