Iris Motor in a Camera

Unless it's a very low volume camera, the motor is probably custom made; you won't be able to get a data sheet. You might be able to get data sheets for similar motors but there is no guarantee how closely yours will match. You might try contacting the camera manufacturer; they might be sympathetic, but that isn't likely.

Your best bet is to test the motor and develop your own data.

Jim Mueller

--
Jim Mueller wrongname@nospam.com 

To get my real email address, replace wrongname with dadoheadman. 
Then replace nospam with fastmail.  Lastly, replace com with us.

The BabyBird (GooGull) sez: [PDF] Auto-iris Motorized Zoom Lenses - Bosch Security Systems resource.boschsecurity.com/.../Data_sheet_enUS_2191260299.pdf camera optic features. Lenses in this series include 10x, 15x, and

20x zoom range models. Some models provide optional pre- position and manual iris override ... *** Covers the lenses, not the motors. [PDF] D22x9.1B-Y41 - Fujifilm ./pdf/.../d22x91b-y41_e.pdf Fujifilm Wiring. D22x9.1B-Y41. Focal Length ?mm?. 9.1 - 200(22x). Iris Range. F1.2 - T1500(Equivalent to F1500). Operation. Zoom. Motor Drive. Focus. Motor Drive. Iris. *** Useless for your needs; one pager,lens wiring. *** Next 2 are for the drivers, and maybe useful. [PDF] AN41908A - Semiconductor ./AN41908A_AE... Panasonic Corporation AN41908A is a lens motor driver IC for camcorder and security-camera featuring the functions of Iris control. ..... Register input / output signal specification. SCLK. [PDF] AN41919A - Semiconductor ./AN41919A_E.p... Panasonic Corporation AN41919A is a DC IRIS control LSI for IP camera and security ... and is able to control various IRIS motors. Notes) ..... Register input / output signal specification.

..That is the first 4 of a number of hits. If the info in the semi datasheets are insufficient, then try to find out what stepper motors are used,and attack their datasheets.

I've cracked some lenses open and the iris was just a stepper motor with no feedback. Much like old floppy disk heads, they banged up against a stopper to initialize the position every time the aperture opens to full. Closing the aperture was just counting steps.

I don't think I've seen a motor with internal feedback in anything except RC servos. They're expensive and they make assembly difficult. Precision movement usually comes from a stepper motor or optics counting painted lines on the final driven component.

no feedback. Much like old floppy disk heads, they banged up against a stopper to initialize "

No, the feedback was the overcurrent when it bottomed out.

Rememer, form is everything, function is a neessary annoyance, and cost is king.

What good are truncated links?

Do you know about

? ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

I've seen two types of iris motors..

1. A two phase much like a stepper where one coil becomes the mover and the other a sensor for move detection, then they alternate their jobs where is the other coil then becomes the mover and the first one is now the sensor. There is what looks like a spur ring gear and two little coils off the side which are the A and B phase and sensors shared.

3. The spring type. tension spring keeps the iris in one position when power is off. There is a PM that is attached to the linkage of the iris and a coil near by that pulls it. Position is proportional to magnetic strength in the coil. Also, the second coil is the damper coil, this coil has DC current proportional to the velocity of the shutter to create drag so not to allow iris to over shoot or wobble at the stop point.

I am sure there maybe constant DC in the damper coil to prevent it from shaking with normal handling.

I am sure there are other types out there like a PM motor directly driving the iris. A lot of these camera's use the image center to adjust the iris, they just open/close as they see fit from the image sensor and use over current detection for stops or jam detection, which may get mistaken for iris limits.

You need to research which system you're interested in. Maybe you're trying to do all of them in a single chip?

Jamie

it's just an example of what you could have got from google.

tinyurl makes temporary links.

--
umop apisdn 


--- news://freenews.netfront.net/ - complaints: news@netfront.net ---