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.

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	IMX334

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
Weight	138g (+controller 7.8g)

In order to accommodate different image sensors, the focal distance is set back by flange back (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.

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 @ at 5.0 VDC
Max operating frequency	1200 PPS @ 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

Please check the software in the GitHub repository for more detailed table.

Wiring

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

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

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.

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

Power profile

Typical power consumption of the lens