CN1373447A - Film scanning device - Google Patents

Abstract

The invention provides a negative film scanning device which is used for scanning a negative film. The negative film scanning device includes a cold cathode tube for producing a visible light to scan the negative film, an infrared ray generator for producing an infrared ray to scan the negative film, and an optical sensor for receiving the visible light and the infrared ray from the negative film and generating corresponding image signals. The infrared ray can pass through the cold cathode tube to form a more uniform infrared ray so as to scan the negative film.

Description

Film scanning device

The invention relates to a negative film scanning device, in particular to a negative film scanning device for uniformizing infrared rays through a cold cathode tube.

With the increasing development of computer technology, various computer peripheral equipments are also improving with each passing day, and the film scanning device is a suitable example. The film scanning device is used to scan the film to obtain corresponding digital image signals. Generally speaking, negatives are often dusty or scratched due to wear and tear, resulting in poor quality of scanned images. Therefore, higher-end film scanning devices often have the technology to remove image scratches.

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a conventional film scanning device 10 . The film scanning device 10 is used for scanning a film 11 . The film scanning device 10 includes four light emitting diodes (LEDs) 12 a , 12 b , 12 c , 12 d , a frosted glass 14 , a diffuser 16 , a projection lens 18 , and an optical sensor 20 . The LEDs 12a, 12b, and 12c can generate red light R, green light G, and blue light B respectively, while the LED 12d can generate infrared light IR. When scanning, firstly, the negative film scanning device 10 scans with the visible light L formed by the diodes 12a, 12b, 12c, and then scans with the infrared ray IR formed by the diode 12d, so that the infrared ray IR can penetrate the negative film 11 but cannot penetrate The characteristics of dirt and scratches can achieve the effect of removing image scratches by means of software calculations.

However, since a uniform and parallel infrared beam is required to scan the film 11, the film scanning device 10 must be provided with a ground glass 14 and a diffuser 16 to homogenize and parallelize the infrared rays IR. It is relatively complicated, which increases the difficulty of assembly and increases the cost.

Therefore, the main purpose of the present invention is to provide a negative film scanning device, which uses a cold cathode tube to simultaneously provide visible light source and uniform infrared rays, so as to simplify the mechanism and solve the above problems.

To achieve the stated purpose, the present invention provides a film scanning device for scanning a film, the film scanning device includes: a cold cathode tube for generating a visible light to scan the film; an infrared generating device for generating an infrared ray to scan the film; and an optical sensing device for receiving the visible light and the infrared ray transmitted from the film to generate corresponding image signals; wherein the infrared ray passes through the cold cathode tube and reaches The negatives.

In order to further understand the features and advantages of the present invention, the detailed description will now be given in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of a conventional film scanning device.

Fig. 2 is a schematic diagram of the film scanning device of the present invention.

FIG. 3 is a front view of the printed circuit board of FIG. 2 .

Referring to FIG. 2 , FIG. 2 is a schematic diagram of a film scanning device 30 of the present invention. The film scanning device 30 is used to scan a film 32 . The negative film scanning device 30 includes a cold cathode tube 34, such as a fluorescent lamp, which is used to generate a visible light L to scan the negative film 32, an infrared ray generating device 36, which is used to generate an infrared ray IR to scan the negative film 32, and an optical sensing device 38 , used to receive visible light L and infrared rays IR transmitted from the film 32 to generate corresponding image signals. The film scanning device 30 further includes a projection lens 40 disposed between the film 32 and the optical sensing device 38 for projecting visible light L and infrared rays IR passing through the film 32 to the optical sensing device 38 .

As shown in FIG. 2 , the infrared generating device 36 includes a plurality of light emitting diodes (LEDs) 36 a for generating infrared IR. The plurality of LEDs 36 a are arranged in a straight line and disposed on a printed circuit board 46 . The cold cathode tube 34 is disposed between the infrared generating device 36 and the film 32 and is in contact with the infrared generating device 36 . The optical sensing device 38 is a carrier coupling device (CCD), which can convert the visible light L and infrared IR containing the film image information into corresponding analog image signals. The optical sensing device 38 is also electrically connected to a computer 42 for image processing.

The film scanning device 30 performs a second scan to achieve the effect of removing image scratches. During the first scanning process, the film scanning device 30 lights up the cold cathode tube 34 to generate visible light L. Visible light L will sequentially pass through the film 32, the projection lens 40 and reach the optical sensor 38 to generate a first image signal. The first image signal includes the original image contained in the film 32 and the image caused by scratches or dirt. . During the second scanning process, the film scanning device 30 will turn on the infrared ray generating device 36 and turn off the cold cathode tube 34 to generate only infrared ray IR. Infrared IR will pass through the cold cathode tube 34, and also pass through the film 32 and the projection lens 40 to reach the optical sensor 38 to generate a second image signal, and because the infrared IR can penetrate the film 32 but cannot penetrate dirt and scratches, Therefore, the second image signal only includes images caused by scratches or dirt. Thereafter, the computer 42 can perform image processing on the first image signal according to the position information of scratches or dirt contained in the second image signal, for example, compare the first image signal with the second image signal. The subtraction action is used to obtain a result image signal that does not contain scratches or dirty images, thereby achieving the effect of removing image scratches.

As mentioned above, in the present invention, the infrared IR passes through the cold cathode tube 34 and reaches the negative film 32. Due to the optical design of the outer wall structure shape of the cold cathode tube 34, the light can be uniformed, and the inner wall itself is coated with a fluorescent substance , this fluorescent substance also has the effect of uniformizing the light, so the present invention does not need to use the frosted glass 14 to homogenize the infrared rays IR like the known film scanning device 10 . Moreover, the present invention uses the cold cathode tube 34 and a plurality of light emitting diodes 36a arranged in a line to generate visible light L and infrared ray IR respectively, so there is no need to use a diffuser to parallelize the point light source.

Referring to FIG. 3 , FIG. 3 is a front view of the printed circuit board 46 of FIG. 2 . As shown in FIG. 3 , a plurality of LEDs 36 a are disposed on a printed circuit board 46 , and the film scanning device 30 further includes a preheating device 44 disposed on the printed circuit board 46 and beside the cold cathode tube 34 . The preheating device 44 includes two rows of preheating resistors 44a, 44b disposed on both sides of the infrared generating device 36 for preheating the cold cathode tube 34 .

Generally speaking, when the cold-cathode tube 44 is turned off and then turned on again, it takes a buffer time for the cold-cathode tube 44 to reach the operating temperature to emit visible light L with a stable brightness. And in the present invention, when the cold cathode tube 34 is extinguished, the preheating device 44 can generate heat to preheat the cold cathode tube 34, so that the cold cathode tube 34 can reach the working temperature when it is lighted, so as to accelerate the scanning work . The preheating device 44 here is reflective due to its material (such as solder), in order to avoid it from affecting the signal received by the optical sensing device 38, so that the image signal is better, we usually consider adding a reflective plate (not shown), to cover the reflections generated by the preheating device 44, which is an optional device.

Compared with the conventional film scanning device 10, the present invention uses the cold cathode tube 34 to simultaneously provide the visible light source and homogenize the infrared rays without using an additional light homogenizing device. Therefore, the film scanning device 30 of the present invention has the advantages of simple structure, small space occupation, easy assembly, low cost, etc., and can achieve the effect of removing image scratches.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (18)

1. A negative film scanning device is used to scan a negative, and the negative film scanning device comprises: a cold cathode tube for generating a visible light for scanning the film; an infrared ray generating device for generating an infrared ray to scan the film; and an optical sensing device, used to receive the visible light and the infrared light transmitted from the film to generate corresponding image signals; Wherein the infrared rays pass through the cold cathode tube and reach the film. 2. The film scanning device according to claim 1, wherein the optical sensing device is electrically connected to a computer, and the film scanning device scans the film with the visible light to obtain a first image signal, and scans the film with the infrared light negative film to obtain a second image signal, and the computer performs image processing on the first image signal according to the second image signal. 3. The film scanning device of claim 1, wherein the cold cathode tube is placed between the infrared generating device and the film. 4. The film scanning device of claim 3, wherein the cold cathode tube is in contact with the infrared ray generating device. 5. The film scanning device as claimed in claim 1, wherein the infrared ray generating device comprises a plurality of light emitting diodes (LEDs) arranged in a line for generating the infrared ray. 6. The film scanning device according to claim 1, further comprising a printed circuit board, and the infrared generating device is disposed on the printed circuit board. 7. The film scanning device according to claim 1, further comprising a preheating device disposed beside the cold cathode tube for preheating the cold cathode tube. 8. The film scanning device as claimed in claim 7, wherein the preheating device comprises a plurality of preheating resistors disposed on two sides of the infrared generating device. 9. The negative film scanning device according to claim 1, further comprising a projection lens disposed between the negative film and the optical sensing device for projecting the infrared rays and the visible light from the negative film to the optical sensing device . 10. A film scanning device, used to scan a film, the film scanning device comprising: a cold cathode tube for generating a visible light for scanning the film; an infrared ray generating device for generating an infrared ray to scan the film; and an optical sensing device, used to receive the visible light and the infrared light transmitted from the film to generate corresponding image signals; Wherein when the cold cathode tube is turned on, the visible light will pass through the film and reach the optical sensing device to form a first image signal; And when the cold-cathode tube is closed and the infrared generating device is turned on, the infrared rays will pass through the cold-cathode tube and the film to reach the optical sensing device to form a second image signal, which is combined with the first image signal The second image signal is subjected to addition and subtraction processing to obtain a result image signal. 11. The film scanning device of claim 10, wherein the optical sensing device is electrically connected to a computer, and the computer performs image processing on the first image signal according to the second image signal. 12. The film scanning device of claim 10, wherein the cold cathode tube is placed between the infrared generating device and the film. 13. The film scanning device of claim 12, wherein the cold cathode tube is in contact with the infrared ray generating device. 14. The film scanning device as claimed in claim 10, wherein the infrared ray generating device comprises a plurality of light emitting diodes (LEDs) arranged in a line for generating the infrared ray. 15. The film scanning device of claim 10, further comprising a printed circuit board, and the infrared generating device is disposed on the printed circuit board. 16. The film scanning device according to claim 10, further comprising a preheating device disposed beside the cold cathode tube for preheating the cold cathode tube. 17. The film scanning device as claimed in claim 16, wherein the preheating device comprises a plurality of preheating resistors disposed on two sides of the infrared generating device. 18. The negative film scanning device according to claim 10, further comprising a projection lens disposed between the negative film and the optical sensing device for projecting the infrared rays and the visible light transmitted from the negative film to the optical sensing device .

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