Aerial photograph central type shutter mechanism

An aerial photography and shutter technology, applied in the field of aerial cameras, can solve the problems of large number of blades, complex mechanism, low speed and efficiency, etc., to achieve the effect of improving image quality, avoiding impact phenomenon, and avoiding mechanical damage.

CN101718945BInactive Publication Date: 2011-04-20CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides an aerial photograph central type shutter mechanism and belongs to the technical field of structural design of aerial cameras. The central type shutter mechanism comprises main parts including a high-speed motor, a one-circle clutch, a driving wheel system, two blades and the like. The invention adopts a technical scheme that: the motor is used for driving the two blades tocontinuously rotate so as to increase speed and efficiency; the one-circle clutch is used for controlling an exposure period; the carbon fiber(M40) blades with enough rigidity and size stability are used so as to solve the problem of narrow air space in an objective lens; and by adjusting the position of a photoelectric pair, the photoelectric pair can precisely transmit pulses at the exposure starting time and the exposure ending time. The central type shutter mechanism has the advantages that: the high-speed motor is combined with the one-circle clutch, so that the problem that the high-speed motor is difficult to control with the instant acceleration and the instant speed reduction is solved; and the rotary speed of the blades is adjusted by changing the rotary speed of the high-speed motor, so that the impact is avoided so as not to damage the central type shutter mechanically and improve image quality. Because an interface of the mechanism is changed, the mechanism can be appliedto other cameras.
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Description

Technical field:

[0001] The invention belongs to the technical field of aerial cameras and provides a safe, reliable, high-speed and efficient central shutter mechanism for aerial cameras. Background technique:

[0002] According to different structures, the shutters used in existing aerial photography cameras can be divided into three basic types-center type, shutter type and rolling shutter type. The central shutter is usually placed at the position where the light beam is the thinnest among the light groups of the objective lens, which is conducive to meeting the requirements of small structure size and short exposure time. Generally, the objective lens with a focal length below 200mm adopts a central shutter. The speed of the central shutter is also very important, because aerial photography cameras shoot stationary targets in motion. When the speed of the aircraft is constant, increasing the speed of the central shutter can reduce image displacement and improve the qua...

Examples

Embodiment Construction

[0019] Image aerial photography center type shutter mechanism of the present invention such as figure 1 , figure 2 As shown in Fig. 3, blade A 18 and blade B 19 are made of carbon fiber (M40) respectively, which have good rigidity. Under the conditions of humidity of 40 to 70% RH and working temperature of -50°C to +50°C, Good dimensional stability is maintained; fixed on the A rotating shaft 25 and the B rotating shaft 20 through the A pressing plate 16 and the B pressing plate 17 respectively. The A rotating shaft 25 is installed on the B rotating shaft 20 through precision bearings, and the two rotating shafts are concentric. The other ends of the two rotating shafts are respectively equipped with the A gear 7 and the B gear 8, which mesh with the C gear 12 and the D gear 26 on the C rotating shaft 27 respectively. The transmission ratios of the two pairs of gear pairs are 1:1 and 4:1 respectively. The A bevel gear 11 on the C rotating shaft 27 is engaged with the B beve...