JPH03242081A - Film scanner device - Google Patents

Abstract

PURPOSE:To obtain a film scanner device which effectively reads a film with a low cost by arranging photoelectric transducers in optical path parts of R(red), G(green), and B(blue) separated by an optical prism. CONSTITUTION:Linearly arranged photoelectric transducers 13 are provided in positions where R, G, and B of the spectrum due to color separation, namely, spectral separation of an optical prism 12 appear. Consequently, all of three colors are read by one scanning; and respective photoelectric transducers 13 are arranged on the same substrate. Thus, the film picture is read at a high speed at low cost.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a scanner device as a hexagonal means for transmitting an image to a personal computer monitor, for example, and more specifically, it relates to a scanner device as a hexagonal image means for displaying a hexagonal image on, for example, a personal computer monitor. The present invention relates to a film scanner device for A/D converting an image of a transparent original and inputting the image.

[Conventional technology]

Scanners used as image input devices generally include reflective types and light transmissive types.

Among these, the light reflection type is intended for paper originals, and inputs images by irradiating light onto the input original and photoelectrically converting the light image reflected from the surface of the original. On the other hand, the light transmission type is intended for negative or positive film originals.
Shine light onto the input document.

The image is input by photoelectrically converting the optical image obtained by transmitting it through the surface of the original.

The general configuration of this light transmission type image input device, in other words, a film scanner device, is shown in the schematic configuration diagram of FIG.

In the figure, the optical system includes a light source 1 arranged along the optical axis.
, an illumination lens 2, an imaging lens 3, and a photoelectric conversion element (
For example, it is composed of a CCD line image sensor (hereinafter referred to as CCD) 4. A film 5 to be input is placed between the illumination lens 2 and the imaging lens 3, and a filter 6 is further placed between the illumination lens 2 and the film 5. The film 5 is a flat film support plate 7
For example, in the case of line sequential,
A film 5 is fixed, and a filter 6 having color filter areas of R (red), G (green), and B (blue) is switched and fed three times for one line of the film by a filter switching mechanism 10, and read by a CCD 4. This means that one line has been read.

Next, the film 5 is fed one line in the vertical direction (sub-scanning direction) in the figure by the film feeding mechanism 9, and the filter 6 is similarly switched to perform photoelectric conversion by the CCD 4. By performing this for all lines, the image for one frame is input.

In addition, as another example, a dichroic prism is placed on the optical path from the imaging lens, and this prism allows R, G, and
, H, and one CCD array for each color.
Some have three of each. In this case, the filter switching mechanism 10 and the R2O, H filters 6 are not required.

[Problem to be solved by the invention]

By the way, in the former type of film scanner device, a film feeding mechanism 9 is used to sub-scan the film 5.
However, a filter switching mechanism IO is also provided for switching the filter 6. Each of these mechanisms is equipped with a motor, for example a stepping motor, as a source of swelling. In other words, two mechanisms and two motors are provided to drive the film 5 and the filter 6, resulting in a highly sophisticated mechanism. Also, 1
In order to scan a line, it is necessary to switch filters and scan three times, which poses a problem of poor reading efficiency.

In addition, for film scanner devices such as the latter,
However, not only is the dichroic ink prism itself expensive, but it also requires three CCD arrays as separate substrates, and the positions of the dichroic prism and CCD array cannot be accurately determined. There is a problem in that it requires careful adjustment, which increases not only the cost of parts but also the cost of assembly.

The present invention was made in view of the above technical background, and its purpose is to provide a film scanner device that is low cost and has high reading efficiency.

[Means to solve the problem]

The above purpose is to be equipped with a light source, an illumination lens, an imaging lens, and a photoelectric conversion element, and a film to be read is placed between the illumination lens and the imaging lens, and the film is recorded on the film surface. In a film scanner device that optically scans analog image information and converts it into digital image information, an optical prism is placed on the optical path from the imaging lens, and R and G are further separated into colors by the optical prism.

By arranging photoelectric conversion elements in each of the optical path portions of B, this can be distantly related.

[For production]

According to the above means, the optical prism performs color separation, that is, vector separation, and the R, G, B
Since photoelectric conversion elements are arranged in a line at the positions where the colors appear, all three colors can be read by scanning at -degrees.

In addition, since each photoelectric conversion element is arranged in parallel on the same substrate,
Costs can also be kept low.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a film scanner device according to an embodiment. In the following description, the same reference numerals are given to the same parts as in the conventional example.

The film scanner device according to this embodiment includes a light source 1 equipped with a reflection mirror 11 on the back side, an illumination lens 2 that irradiates the film surface with light emitted from the light source 1, and a film 5 that is sent in the sub-scanning direction. a film feeding mechanism 9; an imaging lens 3 that passes through the film 5, collects light, and forms an image;
It is composed of a prism 12 that spectrally decomposes the light imaged by the imaging lens 3, and a CCD 13 disposed at the imaging position of the spectrum separated by the prism 12.

As shown in FIG. 2, the C CD 13 according to this embodiment includes three line sensors 13r and 13g on one board.

13b, and these line sensors 13r.

The arrangement positions of 13g and 13b are determined according to the imaging positions of the R, G, and B colors spectrally separated by the prism 12. In addition, each line sensor 13r, 13g, 13
Attach R, G, and B color correction filters (trimming filters) to the top surface of b. If a color correction filter is not attached to the CCD 13, a color correction filter is inserted between the prism 12 and the CCD 13.

Note that the illumination method uses a Kohler system to reduce unevenness in illuminance, and the light source 1 is a small one with a variable amount of light, such as a halogen lamp. Further, as the reflecting mirror 11, for example, a dichroic type mirror is used that efficiently excludes heat rays.

In the film scanner device configured as described above, the light emitted from the light source 1 is also reflected from the reflection mirror 11 and enters the illumination lens 2 with efficient use. The light emitted from the illumination lens 2 is irradiated onto the film 5. The light that has passed through the film 5 and contains the film image data is transmitted through the imaging lens 3 and enters the prism 12 for color separation.

The flange back of the imaging lens 3 is determined in consideration of the detection by the prism 12 and CGD1,3. The light spectrally converted by the prism 12 is divided into R, G, and B CG D
13 line sensors 13r, 13g, and 13b to output image data for each color.

When such a prism 12 and CCD 13 are used,
R, G, and B data can be read at once by scanning each line. Therefore, if the film 5 is sub-scanned by one step for each line of main-scanning, or in other words, by moving the film 5 by the number of steps in the sub-scanning direction, information on one screen of the film 5 can be read in color. This enables high-speed reading of film images at low cost.

〔Effect of the invention〕

As is clear from the above description, according to the invention configured as described above, the prism for color separation separates the light,
Since the RlG and B light components in the separated spectrum can be read line by line with a photoelectric conversion device (CCD) and converted into image data, high-speed reading is possible, and the photoelectric conversion device (CDD) Since three line sensors may be provided on one board, the cost is also reduced.

[Brief explanation of drawings]

1 and 2 are for explaining the present invention in detail, FIG. 1 is a schematic configuration diagram of a film scanner according to an embodiment, FIG. 2 is a plan view showing the arrangement of a CCD line sensor, FIG. 3 is a schematic diagram of a conventional film scanner device. In the figure, 1 is a light source, 2 is an illumination lens, 3 is an imaging lens, and 5
is a film, ll is a reflective mirror, 12 is a prism, 13
is a photoelectric conversion device (CCD), 13r, 13g. 13b is a line sensor.

Claims (1)

[Claims] (1) A light source, an illumination lens, an imaging lens, and a photoelectric conversion element are provided, and a positive or negative film to be read is placed between the illumination lens and the imaging lens, and the film surface is In a film scanner device that optically scans recorded analog image information and converts it into digital image information, an optical prism is placed on the optical path from the imaging lens, and R, G, A film scanner device characterized in that photoelectric conversion elements are arranged in each of the optical path portions of B.