JPS6253567A - Picture input device - Google Patents

Abstract

PURPOSE:To miniaturize the titled device by giving a kind of each separation filter respectively to each photodetector element of a solid-stage element and arranging a transparent picture between an illuminating means and the solid- stage image pickup element. CONSTITUTION:As color separation filters 18, a red filter R, a green filter G and a blue filter B of total 3 kinds are used and any one kind among the 3 kinds is arranged in correspondence to each photodetector element. The luminous flux from an illuminating light source 2 passes partly through a condenser lens 6 and the other part is reflected by a reflecting mirror 4 and passes through the condenser lens 6 to illuminate a diffusion plate 8. A film 10 is illuminated with comparatively uniform strength by the action of the diffusion plate 8. Thus, each photodetection element of the solid-stage image pickup element 12 which is in contact with the film 10 reads color separation picture element information of the picture on the corresponding film 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image input device, and more particularly to a device for photoelectrically converting and inputting a transparent image.

The present invention also relates to an image input device particularly suitable for inputting color images.

[Conventional technology]

In recent years, as the amount of image information has increased, image information 't-
Increasingly, signals are converted into electrical signals and handled in various ways. Under these circumstances, image input devices that photoelectrically convert images recorded on photographic film or the like into electrical signals have become extremely important as input devices for, for example, photoelectric transmission devices and image processing devices.

2. Description of the Related Art Conventionally, as an image input device for images such as photographic film, the following devices have been used, for example.

FIG. 9 is a perspective view showing a schematic configuration of a conventional drum scanner type image input device.

In the figure, 22 is a rotating drum, and 24 is its rotating shaft. On the drum 22 is a film 2 on which an image has been recorded.
6 are closely and fixedly supported.

28 is an imaging lens, and 30 is a photomultiglare. The imaging lens 28 captures the dotted portion of the film 26 by
The image is formed on the light receiving section of the automatic multi-glare 30, and the image information of the dot-shaped portion on the digital camera 6 is photoelectrically converted and read. Here, main scanning of the film 26 is performed by rotating the drum 22 around the rotation shaft 24, while the imaging lens 28 and photomultiglazer 30 are rotated along the drum rotation shaft 24. By integrally moving the film 26 by minute distances, sub-scanning of the film 26 is performed, and image information of the entire film 26 is thus inputted.

FIG. 10 is a perspective view showing a schematic configuration of a conventional camera type scanner type image input device.

If you look at the buttons in the figure, 32 is the film with recorded images, 34
is an imaging lens. Further, 36 is a one-dimensional solid-state image sensor, for example, a CCD (Charg@Couple
dDevice). The imaging lens 34 forms an image of the linear portion of the film 32 on the light receiving portion of the solid-state image sensor 36, and image information of the linear portion on the small film 32 is photoelectrically converted and read. Here, scanning of the film is performed by moving the solid-state image sensor 36 in a direction perpendicular to the direction of its light-receiving portion and perpendicular to the optical axis of the imaging lens 34, and thus image information of the entire film 32 is inputted. It will be done.

In addition, in recent years, there has been an increase in the number of companies handling colored image information9, and for this reason, the image input devices described above are also equipped with color separation means to read color image information. It is being done.

[Problem that the invention seeks to solve]

However, the drum scanner one-type image input device shown in FIG. 9 has problems in that the device is large and bulky and the image input speed is slow.

Further, the camera-type scanner type image input device shown in FIG. 10 has a problem in that the device becomes large in size.

[Failure to solve the problem]

According to the present invention, in order to solve the problems of the prior art as described above, the present invention includes means for illuminating a transparent image and a solid-state image sensor, and each light-receiving element of the solid-state image sensor has a means for illuminating a transparent image and a solid-state image sensor. is provided with one type of color separation filter, and furthermore, a transparent image can be placed between the illumination means and the solid-state image sensor in a state in which it is substantially in contact with the solid-state image sensor. An image input device is provided.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic vertical sectional view showing a first embodiment of the device of the present invention.

In the figure, 2 is a white light source for illumination, 4 is a concave reflecting mirror, and 6 is a condenser lens, and these constitute the illumination means. Reference numeral 8 denotes a light diffusing plate, which is arranged substantially perpendicular to the optical axis of the optical system of the illumination means. A film 10 on which a color image has been recorded is tightly attached to the surface of the light diffusing plate 8 on the side opposite to the illumination means side. 12! ′
i, a one-dimensional solid-state imaging device), the device 12 is a substrate 1
It is fixedly placed on 4. The solid-state image sensing device 12 is composed of, for example, a CCD, a MOS W sensor, or a 7mol/7Asonrecon sensor.

2 is a schematic plan view of the apparatus of FIG. 1; FIG. However, in this figure, illustration of the illumination means is omitted. As illustrated, the solid-state image sensor 12 includes a large number of light-receiving elements 16 arranged in two rows in one direction (Y direction).

FIG. 3 is a partially enlarged sectional view of the device of FIG. 1.

In this figure, 16 indicates each light-receiving element of the solid-state image sensor 12, and 18 indicates a color separation filter attached to the light-receiving element. In this embodiment, since the solid-state image sensor 12 is brought into substantially contact with the film IOK, a protective layer 20 is formed on the surface of the solid-state image sensor 12 to prevent wear.

FIG. 4 is a partially enlarged plan view showing the arrangement of the color separation filters 18 of the solid-state image sensor 12 of the apparatus shown in FIG. As the color separation filter 18, for example, a gelatin dyed filter or a dielectric thin film deposited filter can be used. In this embodiment, the color separation filters 18 include a red filter (R), a green filter (G), and a blue filter (B).
) are used, and one of these three types is arranged corresponding to each light receiving element.

FIG. 5 is a graph showing the spectral transmittance of the R filter, G filter, and B filter in this example.

As shown in FIG. 4, in this embodiment, one row of color separation filters arranged in two rows in the Y direction is all G filters, and the other rows are alternately filled with R filters and B filters. Thus, the arrangement density of the G filters is higher than the arrangement density of the R filters and the arrangement density of the B filters.

In this embodiment, a part of the light flux emitted from the illumination light source 2 directly passes through the condenser lens 6, and the other part passes through the condenser lens 6 after being reflected by the reflector 4, and is diffused. The board 8 is illuminated. Due to the action of the diffuser plate 8, the small film 10 is illuminated with relatively uniform intensity. In this way, each light-receiving element of the solid-state image sensor 12 brought into contact with the film 10 reads color-separated pixel information of the corresponding image on the film 10.

In this embodiment, since the protective layer 20 is provided on the surface of each light-receiving element of the solid-state image sensor 12, the film 1
0 and the light receiving element are separated from each other. For this reason, the image information on the film 1O will be read somewhat blurred. In order to make this blurring effect less noticeable, it is desirable that the arrangement pitch of each light receiving element be approximately 10 times or more the thickness of the protective layer 20. For example, the protective layer 20
The thickness of the light-receiving elements is about 10 times or more, and therefore the arrangement pitch of the light-receiving elements is preferably about 100 μm or more.

In this embodiment, in order to read the entire image of the film 10, the solid-state image sensor 12 and the substrate 14 are moved integrally in the X direction to perform sub-scanning.

Since the protective layer 20 is provided, the light receiving element of the solid-state image sensor 12 does not wear out.

As is well known, the relative luminous efficiency has a maximum value at a wavelength of approximately 555 mμ. In this example,
As mentioned above, since the arrangement density of the G filter, which has a main transmission region near the wavelength of about 555 mμ, is made higher than the arrangement density of the R filter and the B filter, the resolution of color separation image reading by the G74 router is high. This allows efficient high-quality color reading.

When reproducing the image information read by the apparatus of this embodiment, the intensity of each color separated image information signal is adjusted appropriately to compensate for the difference in pixel density between the 8 types of each separated color, thereby producing an accurate image. can be played.

FIG. 6 is a partially enlarged plan view showing the arrangement of color separation filters of a solid-state image sensor in a second embodiment of the present invention.
, which shows the same portion as in FIG. 4 above.

In this embodiment, the number of light receiving elements of the solid-state image sensor 12 is 1.
Color separation filters are arranged in rows and one color separation filter is placed on each light receiving element.
8 is attached. As shown in FIG. 6, the arrangement is such that the G74 routers are located on both sides of the R and B filters, so the arrangement density of the G74 routers is higher than that of the R and B filters.

FIG. 7 is a schematic plan view showing a third embodiment of the present invention, and shows the same parts as in FIG. 2 above. Although the illumination means is not shown in this figure, the present embodiment is provided with the same illumination means as shown in FIG. 1 above. Further, in this figure, members similar to those in FIG. 2 are denoted by the same reference numerals, and a description thereof will be omitted.

In the figure, reference numeral 13 denotes a two-dimensional solid-state image sensor, which is fixedly arranged on a substrate 15 like the one-dimensional solid-state image sensor 12 described above. The solid-state image sensor 13 is composed of, for example, a COD or MO8 type sensor.

In this embodiment, the solid-state image sensor 13 includes a large number of light-receiving elements 17 arranged in a matrix in the X-Y direction.

In this embodiment as well, a color separation filter similar to that of the first embodiment is provided on each light-receiving element. Further, a protective layer (not shown) is provided on the light receiving element of the solid-state image sensor 13. The solid-state image sensor 13 is brought into substantially contact with the film 30 on the protective layer side.

FIG. 8 is a partially enlarged plan view showing the arrangement of the R filter, Q filter, and 3 filters considered in the color separation filters J and 8 in this embodiment. As shown in the figure, the arrangement is such that the G filter is located on both sides of the R filter and the B filter in the [direction] and the I' direction, so the Q
The arrangement density of the 74 filters is higher than the arrangement density of the λ filters and the B filters. In this example, the above first
Illumination by the illumination means is carried out in the same manner as in the embodiment described above.
), but since the solid-state imaging device 13 is 52-dimensional, appropriate areas of the film 10 can be read at the same time. Therefore, in this embodiment, there is no need for sub-scanning by moving the solid-state image sensor as in the first embodiment, and therefore damage caused by sliding contact between the film 10 and the solid-state image sensor 13 can be avoided. In addition, the thickness of the retention layer of the solid-state image sensor 13 can be made relatively thin, the arrangement pitch of the light receiving elements can be made small, and the resolution of reading can be increased. Furthermore, according to this embodiment, it is possible to remove the bladder at high speed.

In the above embodiments, the array density is changed depending on the type of color separation filter, but the apparatus of the present invention also includes a case where the array density is the same for all types of color separation filters.

〔Effect of the invention〕

According to the image input device of the present invention as described above, since image information is read by bringing the solid-state image sensor into contact with the image, the device can be miniaturized. However, in the apparatus of the present invention, it is possible to perform reading at high speed (by using the solid-state image processing system). can also be read.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the apparatus of the present invention, and FIGS. 2 and 3 are a partially omitted plan view and a partially enlarged sectional view thereof, respectively. FIGS. 4, 6, and 8 are partially enlarged plan views showing the arrangement of color separation filters. FIG. 5 is a graph showing the spectral transmittance of color M74. FIG. 7 is a partially omitted plan view of the apparatus of the present invention. 9 and 10 are perspective views of a conventional image input device. 2: Light source, 4: Reflector, 6: Condenser lens, 8:
Light diffusion plate, 10: film, 12, 13: solid-state image sensor, 14, 15: substrate, 16.17: light receiving element, 18 dichroic separation filter, 20: protective layer. Agent Patent Attorney Minoru Yamashita Hiraito 10 (1'8 Figure 2 Figure 3 X Figure 4 Figure 5 Growth (m) J) → Figure 6 Figure 7

Claims (2)

[Claims] (1) A device for inputting image information recorded as a transparent image as an electrical signal, comprising means for illuminating the transparent image and a solid-state image sensor, and each light receiving element of the solid-state image sensor Each of the elements is attached with one type of color separation filter, and furthermore, a transparent image can be placed between the illumination means and the solid-state image sensor in a state in which it is substantially in contact with the solid-state image sensor. An image input device characterized by: (2) The arrangement density of light-receiving elements fitted with color separation filters that have a main transmission region at wavelengths near the maximum value of relative luminous efficiency is higher than the arrangement density of light-receiving elements fitted with other types of color separation filters. , an image input device according to claim 1.