SU518754A1 - Zalinzovy photo shutter - Google Patents

Description

one

This invention relates to a photo kinotekhnike, namely to the screw-in photo shutters mounted behind the lens.

Golden lens photo shutters are known, containing opening and closing shutters with linear and guides for each of them, an actuator and a trigger mechanism.

In the known shutters, the flaps have a complex curvilinear motion and create an uneven distribution of effective shutter speed across the frame field.

In order to increase the uniform distribution of the effective shutter speed across the frame field in the proposed device, the opening and closing dampers are made in the form of sectors and alternately arranged in a circle, and the guides are arranged radially relative to the light hole and are turned relative to one another by an angle equal to half the sector.

FIG. 1 shows the proposed device, a general view; in fig. 2 - drive one valve; in fig. 3 - scheme of the trigger mechanism.

The device consists of opening 1 and closing 2 dampers in the form of sectors, rectilinear guides 3, lead. yes with a cam disc 4 and a trigger with a rocker 5.

The device works as follows.

All the details of the gate are placed on two parallel cylindrical plates: the drive board 6 and the board 7 of the guide and trigger mechanism, connected by columns 8.

A gear rim 9 is placed in the bore of the board 6, which rotates therein and is prevented from falling out by the strips 1O. The rim 9 is rotated by gear 11, successively, on the engine shaft (not shown), and coupled to the scraper 12 on the rollers 13. Torsion springs 14 are connected at one end to the scraper 12 and -cams 4, Eccentrically mounted pins 15 can move in the grooves 16 of the flaps 1 and 2. The pins 17, fixedly connected to the closing flaps 2, are placed in the guides 3. The cam discs 4 are covered

rocker arms 5, swinging on the axes x 18. The stops 19, pressed into the rocker arms 5, resting against the tooth of the outer surface of the cam discs 4, can fix them in two positions. With the other ends of the rocker arms, ball bearings 2O are in contact, seated on axles 21, which are connected by chains 2 2.

The electric motor through a gear transmission - gear 11 - rim 9 of gear 12. retracts the springs 14, which tend to turn the cam discs 4. The shutter is released by applying a current pulse to the electromagnet winding (not shown). At the same time, the electromagnet's measles, retracted into the solenoid, lifts the ball bearings 20 with a jerk with a jerk. At the same time, the fingers 15 retract the flaps 2 into the second possible gate position is open. After reaching the desired shutter speed, the electronic control circuit supplies

Impulse current in the winding of the second electromagnet, and similar to that described above, the dampers shown in the open position, close the light hole.

Claims (1)

Invention Formula A photo shutter containing opening and closing dampers with straight guides for each of them, an actuator and a trigger mechanism, characterized in that, in order to improve the uniformity of distribution of the effective locking across the frame field, the opening and closing dampers are made in the form of sectors and installed alternately in a circle, and the guides are placed radially with respect to the light hole and are turned relative to one another by an angle equal to half of the sector. 18 17 18 Fig.Z