RU49638U1 - DEVICE FOR DIGITIZING A GRAPHIC IMAGE FROM TRANSPARENT MEDIA OF UNLIMITED LENGTH - Google Patents

Abstract

The developed device relates to image scanning means, for example, to polygraphic scanning devices (projection scanners) intended for scanning transparent originals of unlimited length. The technical result of the claimed solution is to eliminate these drawbacks, namely: "instant" information removal from one frame of the scanned film due to the installation of a CCD matrix radiation in place of the size proportional to the frame and automatic scrolling of the scanned film of unlimited length due to the proposed holder design and scrolling films. The problem is achieved in that the device for digitizing a graphic image includes a radiation detector installed in the housing and located on the same optical axis and made in the form of a CCD matrix and the size proportional to the film frame, a lens consisting of lenses, a holder that includes two pairs a film fixing gear, a film rewinder of two blocks with two optocouplers in each, and feeding and receiving bobbins with a film located on both sides of the film holder, and the optocouple blocks ar are located between the bobbins and the holder, and the backlight of the film is made in the form of a luminous screen consisting of LEDs, frosted glass and the size corresponding to the film frame.

Description

The developed device relates to image scanning means, for example, to polygraphic scanning devices (projection scanners) intended for scanning transparent originals of unlimited length.

The prototype of the claimed solution is one of the slide scanners of the latest modification of the Microtek company - the ArtixScan l20 tf scanner. Published: "Compart": magazine, equipment section, Basir Akhmedov. November 2003 Page 68. Copy attached. This scanner model is designed to scan transparent originals. The device includes: a housing, an optical system with a variable focal length, a movable carriage with a radiation receiver (CCD), the backlight of the original parallel to the CCD line, a film holder.

Advantage: it is possible to manufacture sufficiently long rulers with a large number of sensitive elements along its length, which provides a fairly high resolution.

Disadvantages: a very slow process of acquiring information (not "instantly") due to the long movement of the CCD line; lack of devices for scanning film rolls of unlimited length.

The technical result of the claimed solution is to eliminate these drawbacks, namely: "instant" information removal from one frame of the scanned film due to the installation of the CCD matrix radiation in place of the size proportional to the frame and rewound of the scanned film of unlimited length due to the proposed design of the holder and film winding .

The problem is achieved in that the device for digitizing a graphic image includes a radiation detector mounted in the housing and located on the same optical axis and made in the form of a CCD matrix and the size proportional to the film frame, the lens consisting of lenses, a holder including two pairs of fixing gears film, a device for rewinding a film of two blocks with two optocouplers in each and the feeding and receiving bobbins with a film located on both sides of the film holder, and the optocouple blocks p are located between the bobbins and the holder, and the backlight of the film is made in the form of a luminous screen consisting of LEDs, frosted glass and the size corresponding to the film frame.

Figure 1 shows the General block diagram of the scanner, where:

1. CCD

2. The lens

3. Film holder gears

4. Case

5. Scanned film

6. Optocoupler blocks

7. Frosted glass

8. Feeding reel for film length

9. Host reel for film length

10.LED matrix

Figure 2 shows a control circuit of the amount of free sag using blocks of optocouplers, where:

5 Film in free sag

11 Radiating parts of optocouplers.

12 Radiation receiving parts of optocouplers.

The device operates as follows: (see Figure 1) the scanned film 5, wound on the feeding reel 8, is pulled through the gear of the film holder 3, and its end is wound on the receiving reel 9. The matrix of LEDs 10 illuminates the scanned frame through the frosted glass 7 used for uniformity of illumination. The light rays passing through the lens 2 transfer the image to the CCD matrix 1. On the CCD matrix, the light is converted at each point in the image and an electrical signal whose magnitude is proportional to the brightness of the image point. Then, the next frame is moved to the place of scanning using gears 7. To compensate for jerking between the gears 7 and the bobbins, free sagging of the film is created. (See Figure 2). When the film 5 intersects the optocouplers located in the free sag of the upper or lower light rays, a signal is applied to the engine of the reel with the film whose sag is controlled by the optocouplers, forcing it, accordingly, to accelerate or slow down the rotation. The optocoupler consists of a radiating part 11 and a receiving part 12.

Only such a sequence of the above mentioned features in this device allows us to solve the "instant" removal of information from one frame of the scanned film and scanning the film of unlimited length.

Claims (1)

A device for digitizing a graphic image from transparent carriers of unlimited length, comprising a housing and a CCD radiation detector located on the same optical axis, a lens consisting of lenses, a film holder with an integrated film winding device, film illumination, characterized in that the radiation receiver made in the form of a CCD matrix, the size proportional to the film frame, a holder that includes two pairs of gears, fixing the film, a film winding device of two blocks with two optocouplers in house and feed and take-up reel of the film, located on both sides of the film holder, wherein the photocouplers are arranged between the blocks and the holder reels, and the film is formed as a lighting luminous screen consisting of LEDs, matte and size corresponding film frame.