JPH0226465A - Reader - Google Patents

Abstract

PURPOSE:To prevent the enlarging of a title device and to exactly read a picture by executing the reading of a transmitted light image by a high density reading part and a miniature external luminous source provided separately from a reading part to read a normal non-transmitted original when a miniature transmitted original is read. CONSTITUTION:A high density reading part 9 is provided inside a high density reading unit 90 of a rectangular box shape, and when a reflected original is read at high density, the high density reading unit 90 is moved to the requested position of a non-transmitted original on original table glass 2 in a main scanning direction by driving a stepping motor in advance. Then, the direction of an aperture is set so that a luminous source 70 may project to a position B, the main scanning is executed by image-forming the image of the position B on a solid image pickup element 92 by a reading lens 91 by the irradiation of the light of the luminous source 70 in the same way, and sub-scanning is executed by the driving of a motor. Consequently, the reading at higher density can be attained than a reading part 8 to read the reflected light image of the non-transmitted original.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reading device for reading original documents in an image forming apparatus such as a copying machine, and more specifically to a reading device capable of reading photographic film.

[Prior art]

Copying machines have been developed that produce large-sized copies from transparent originals, such as slide films (for example, Japanese Patent Application Laid-open No. 198439/1983). In addition, in recent years, digital copying machines that can read originals with image readers and store and process the image information as electrical signals have become popular.
In other words, devices have been developed that facilitate the reversal of positives from negative films and also produce large-sized copies.

[Problems to be Solved by the Invention] By the way, when obtaining a large-sized copy from a photographic film or the like as described above, for example, by using a document holder equipped with a reflective plate, the film image can be reproduced in the same way as a normal opaque document. It is conceivable to read the reflected light image and enlarge it through signal processing or read it using an enlarging optical system.
It is not easy to accurately position and fix the film on the document table, and even if it is possible to fix the film, the light source for obtaining the reflected light image must be at least the main part of the document table for ordinary opaque documents. Since the structure is such that the entire width in the scanning direction can be illuminated, illumination for small films is extremely wasteful. Since the film image is small, there is a problem in that the resolution decreases when it is enlarged.

Therefore, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 59-198439, a method is adopted in which a projector or the like is used to project a film image in an enlarged manner onto a document table, and the enlarged projected image is copied (read). However, this requires a large space for the optical path for enlarging and projecting the film image onto the document table using the projector, resulting in an increase in the size of the apparatus.

The present invention has been made in view of the above circumstances, and when reading a small transparent original such as a photographic film, it is possible to avoid an increase in the size of the apparatus by not using an enlarged projection means such as a projector, and to read a small transparent original such as a photographic film. The purpose of the present invention is to provide a reading device that efficiently illuminates the area and enables reading with high resolution.

[Means to solve the problem]

A reading device according to the present invention includes a reading section that reads a reflected light image of an opaque original placed on a document table using irradiation light from a light source provided therein, the reading device includes a transparent original supporting part that supports a transparent original with its original surface facing inside; an external light source that is provided above the transparent original supported by the transparent original supporting part and illuminates the transparent original; A lens is interposed between the external light source and the transparent original and forms parallel light to irradiate the transparent original; It is characterized by comprising a high-density reading section.

[Effect]

The transparent original is supported near the original table with the original surface facing inward. The illumination light from the external light source passes through the lens to form parallel light, which illuminates the transparent original. Then, the transmitted light image of the transparent original is read by the high-density reading section at a higher density than the reading section that reads the reflected light image of the opaque original.

〔Example〕

The reading device according to the present invention (hereinafter referred to as the device of the present invention) includes:
Equipped with four reading modes depending on the type of document.
First, in mode 1, a normal opaque original is irradiated with light and an image is read by the reflected light. Mode 2 similarly reads opaque originals, but it reads at a higher density than Mode 1, and this was designed to prevent the resolution of the image from decreasing when obtaining an enlarged copy. It is something. Mode 3 is for reading a relatively large transparent original, such as a transparent sheet for OHP, and its reading density is equivalent to mode 1.

Mode 4 is a mode related to the main part of the present invention, and is for reading a small transparent original, that is, a photographic film, with high density, similar to the purpose of mode 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. 1 and 2 are external perspective views of the apparatus of the present invention, in which the reading apparatus main body 1 is provided with an original platen glass 2 on the upper surface, and an operation panel 3 and the mode 4 at the front end thereof.
The rectangular openings 4 are arranged so that the longitudinal direction of the rectangular openings 4 is in the width direction of the platen glass 2, that is, the reading direction. It is provided to match the width direction of the device main body 1. Opening 4
As shown in FIG. 1, a seat plate 40 for mounting the film holder 5 and light box 6 is provided at the peripheral edge of the opening 4 at a position lower than the top surface of the document table glass 2.
There are holes 4 in the vicinity of both corners near the document platen glass 2.
1.41 was established. Further, on the front side edge of the opening 4, a plurality of photointerrupters 42 for detecting the position of the light box 6, which will be described later, are arranged in parallel at equal intervals.

The opening 4 is normally sealed with a lid (not shown) when the film holder 5 and light box 6 are not attached, that is, when mode 4 reading is not performed.

FIG. 3 is a perspective view showing the internal structure of the reader main body 1. At the inner bottom of this, a pair of rails 10a having a length slightly shorter than the width of the reader main body 1 are provided.

The rails 10b are arranged opposite to each other with their longitudinal directions aligned with the width direction of the reader main body 1.

On 10b, a rectangular parallelepiped-shaped reading head 7 having a depth slightly shorter than the depth of the reading device main body 1 is placed in a straddling state with its longitudinal depth direction orthogonal to the extending direction of each of the rails. S! 1a and 1b are installed on the rails 10a and 10b so as to be driven by motors 13, respectively, and wires 12 are stretched over these.
a, 12b to move on the rails 10a, 10b in the width direction of the reader main body l, that is, in the left-right direction.

FIG. 4 is a longitudinal cross-sectional view of the reading head 7 taken in a direction perpendicular to the depth direction and viewed from the front, and FIG. 5 is a perspective view showing the internal structure of the reading head 7. The reading head 7 has an opening formed in the center of its upper surface over the entire length in the depth direction, and a glass plate 74 is sealed in the opening. low density reading section 8,
Furthermore, a high-density reading unit 9 used in modes 2 and 4 is provided respectively, and the axial direction of the reading unit 9 is placed close to the glass plate 74 and is aligned with the depth direction of the reading head 7. For example, an aperture-type fluorescent lamp is provided. A light source 70 consisting of the following is arranged. The light source 70 has a length substantially equal to the length in the depth direction of the original platen glass 2, and is mounted on the back side of the reading head 7 so as to face the lower surface of the original platen glass 2 through the glass plate 74. It is installed with one end close together. The low-density reading section 8 is disposed on the right side of the light source 70, and the low-density reading section 8 is connected to an imaging element (lens) 81 and a solid-state imaging element 82, each having approximately the same length as the light source 70. The light incident side of the imaging element 81 is placed facing the glass plate 74, and the solid-state image sensor 82 is placed oppositely below the light output side. In other words, the low-density reading section 8 is configured so that its longitudinal direction coincides with the depth direction of the document table glass 2 to perform main scanning on the document.

The left side of the light source 70 has a reading width of 115 to 1/10 of the reading width of the low-density reading section 8, and its longitudinal direction is parallel to the longitudinal direction of the low-density reading section 8, that is, the document platen glass. A high-density reading section 9 is arranged in the main scanning direction of No. 2, and the high-density reading section 9 is composed of a reading lens 91 and a solid-state image sensor 92. Similarly, the incident side of the reading lens 91 is connected to a glass plate. 74, and a solid-state image pickup device 92 is placed oppositely below the emission side. Reading lens 91
For example, a converging Rondo lens is used, which is because - solid-state imaging devices for high-density reading have lower sensitivity than those for low-density reading, so there is sufficient S for high-density reading. /N ratio. The high-density reading unit 9 is a rectangular box-shaped high-density reading unit 90 whose one end is inserted through a shaft 73 that is disposed parallel to the axial direction of the light source 70 over the entire length of the reading head 7 in the depth direction. It is equipped inside,
The high-density reading unit 90 is provided with a roller 93 on the side surface opposite to the insertion portion of the shaft 73 so that its rotation axis is perpendicular to the longitudinal direction of the shaft 73, and is provided in the reading head 7. Pulleys 71a and 71b driven by a stepping motor 72 and a wire 75 stretched between them
Therefore, it is configured to move in the axial length direction of the shaft 73, that is, in the depth direction of the reading head 7.

Now, in the above configuration, reading operations in modes 1.2 and 3 will be explained. First, when reading an opaque original in mode I at low density, the direction of the aperture is set so that the light s7° is projected to the position A shown in FIG. And on the manuscript glass 2! ! The light from the light source 70 is irradiated onto the lower surface of the opaque original placed in the second place, and the diffusely reflected light is imaged on the solid-state image sensor 82 by the imaging element 81 of the low-density reading section 8, and electrically scanned. Perform main scanning by 1
Get line image information. Further, by driving the motor 13, the reading head 7 is moved in the width direction of the reading device main body 1, thereby performing sub-scanning of the original image. Here, the image reading density by the low-density reading section 8 is 10 to 2
The value is 0 pixel/M.

Next, if you want to read the reflective original in mode 2 at high density, first move the high density reading unit 90 to the stepping motor 72.
is moved to a desired position of the opaque original on the original table glass 2 in the main scanning direction. Then, the direction of the aperture of the light source 70 is set so as to project light to the position B shown in FIG. Main scanning is performed by forming an image on 92, and sub-scanning is performed by driving the motor 13. The image reading density by this high-density reading section 9 is 50 to 200 pixels/mm.

When reading a large transparent original at low density in mode 3, a light hood shown in FIG. 6 is used. Figure 6 shows
FIG. 3 is a longitudinal cross-sectional view showing a state in which the light hood is attached to the reading device main body 1. FIG. The light hood 10 placed on the document table glass 2 of the reading device main body l has a square pyramid shape, and is equipped with a light source 11 at the top of the light hood 10, and a heat-insulating filter arranged below the light hood 10 to direct the light from the light source 11. 12 to diffuse irradiation to the bottom side. A Fresnel lens 13 and a transmission diffusion plate 14 are arranged in a laminated manner at the bottom, and the lower surface side of the transmission diffusion plate 14 is placed opposite to a transmission original (not shown) placed on the original platen glass 2. be. The transmission diffuser plate 14 is provided to alleviate illumination unevenness such as an annular shadow of the Fresnel lens 13. Reading of the transparent original is performed by the low-density reading section 8 in the same manner as in mode 1.

As described above, in all modes 1 to 3, an original is placed on the original platen glass 2 and the original image is scanned.

Next, the structure of the film holder 5 and light box 6 for reading photographic film in mode 4, which is the main part of the present invention, will be explained. 7 and 8 are external perspective views showing the structure of the film holder 5. The long plate-shaped film holder 5, which is fitted into the opening 4 of the reader main body l, has an image of the film in the center. Rectangular openings 50a and 50b whose short sides are approximately equal in length to the width.
It is constructed by integrally joining a presser plate 5a and a substrate 5b, each having the following: By changing the way these are joined, both a slide film or a normal negative film can be interposed and held between the two members. It looks like this.

FIG. 7 shows a case where a slide mount on which a slide film is mounted is held, and the substrate 5b has a recess 51b on the upper surface of which the slide mount is inserted and placed.
, 51b are formed at two locations each on the side edges in the length direction of the opening 50b, that is, two recesses 51b, for a total of four locations. The depth of the recess 51b is determined so that the height of the top surface is lower than the top surface of the substrate 5b. The substrate 5b is
There are pins 58.5 near both corners on the front side of the top surface of this.
8, and also a bottle 59 near both corners on the back side of the bottom surface.
, 59 (see FIG. 8) are provided in a protruding manner.The presser plate 5a has convex portions 51a fitted in the recesses 51b of the substrate 5b at four locations (see FIG. 8) on the lower surface thereof. It is formed at the side edge in the length direction of the opening 50a, and the protrusion height of this protrusion 51a from the lower surface of the holding plate 5a is the same as when the slide mount is inserted and placed in the recess 51b of the board 5b. The length is set to be approximately equal to the length from the top surface of the slide mount to the top surface of the board 5b.The length of the presser plate 5a is set at a position between the convex portion 51a and both edges in the length direction of the presser plate 5a. It is formed by penetrating in the thickness direction an elongated guide hole 52.52 which is slightly shorter than the length of the presser plate 5a and whose longitudinal direction coincides with the length direction of the presser plate 5a. A groove 550 whose longitudinal direction coincides with this length direction is formed on the front side surface, and recessed holes 55, 55, etc. having a hole diameter larger than the groove width are formed in the groove 550 at equal intervals. There is a board 5 near both corners on the front side.
A hole 53.53 into which the pin 58.58 of b is inserted is formed to penetrate in the thickness direction.

When holding a slide mount with the film holder 5 configured as described above, first, the slide mount (not shown) is inserted and placed in the recesses 51b and 5Ib of the substrate 5b. Then, the convex portions 51a, 51a of the presser plate 5a are fitted into the recesses 51b, 51b, and the pins 58, 58 of the substrate 5b are fitted into the holes 53,53 of the presser plate 5a, thereby connecting the presser plate 5a and the substrate. 5b. As a result, the slide mount is held at its side edges,
Openings 50a and 50b are located in a direction perpendicular to the screen of the image portion of the slide film, so that both sides of the image are exposed to the outside.

Figure 8 shows the case of holding a negative film, that is, a piece of film cut into a predetermined number (usually 5 frames) of each frame to be stored in a storage case. For the plate 5a and the substrate 5b, the surfaces opposite to the surfaces shown in FIG. 7 are used. The upper surface of the substrate 5b (7th
Opening 5 in the center part in the width direction on the lower surface in the figure
A recessed portion 57b having a bottom portion wider than the width of the substrate 5b and approximately equal to the width of the film is formed over the entire length of the substrate 5b in the longitudinal direction.

Similarly, in the vicinity of a portion of both corners on the near side of the upper surface, as described above, the bottles 59 and 59 are protruded. Pressing plate 5a
A convex portion 56a, which fits into the recess 57b, is formed on the lower surface (upper surface in FIG. 7) of the holding plate 5a, extending along the entire length of the holding plate 5a. Grooves 560 and recesses 56, 56, . ...is formed.

Holes 54.54 into which the bottles 59.59 of the substrate 5b are inserted are formed near a portion of both corners on the front side, that is, near a portion of the corner where the holes 53.53 are formed and a portion of the opposite corner. It is formed by penetrating it in the horizontal direction.

When holding a film piece with the film holder 5 configured as described above, the film piece is held in the recess 5 of the substrate 5b.
7b and place it there. And a convex portion 56a of the presser plate 5a
is fitted into the recess 57b, and the pin 59 of the substrate 5b is fitted into the recess 57b.
．． 59 are fitted into the holes 54 and 54 of the presser plate 5a to connect the presser plate 5a and the substrate 5b. As a result, the film piece is sandwiched at its winding hole portion and both ends in the length direction, and the openings 50a and 50b are located in the direction perpendicular to the screen of the image portion of the film, so that both sides of each image are exposed to the outside. Let them come to you.

FIG. 9 is an external perspective view showing how the light box 6 is attached to the film holder 5, FIG. 10 is a longitudinal cross-sectional view taken along the line X-X showing its internal structure, and FIG. 11 is a diagram of these reading devices. FIG. 2 is a vertical sectional view of a main part showing a state in which the film holder 5 is attached to the main body 1, and shows a state in which the film holder 5 holds a slide mount. The light box 6 is the film holder 5
It has a rectangular parallelepiped shape with a bottom portion of approximately the same thickness as the size of the slide mount 100 held by the slide mount 100, and has pedestals 68a and 68b extending from both ends of the bottom portion in the depth direction.
Projections (not shown) provided on the lower surface of each pedestal 68a, 68b are fitted into guide holes 52, 52 formed in the holding plate 5a of the film holder 5, so that the film holder 5 can be moved in the longitudinal direction. Further, when holding a slide film or a piece of film, a recess 69 that engages with the projection 57a or both of the projection 51a located on the upper surface of the presser plate 5a is provided at the bottom for the entire length in the width direction, that is, in the moving direction. It was formed over a period of time.

A positioning plate 66 for selecting a film image to be illuminated and a light shielding plate 67 used for detecting the position of the light box 6 on the film holder 5 are attached to the pedestal 68a. The positioning plate 66 is bent like a plate from the upper surface of the pedestal 68a to the lower side of the light box 6, and a hemispherical projection provided at the center of the positioning plate 66 is engaged with a groove 550 formed on the side surface of the presser foot W5a. It is designed to slide as the light box 6 moves.
The film image is positioned by fitting it into the recessed hole 55 provided based on the longitudinal arrangement position of the film holder 5 of the slide mount 100 and the arrangement interval of each frame of the negative film. The light shielding plate 67 protrudes forward from the upper surface of the pedestal 68a, and when the light box 6 and the film holder 5 are installed in the opening 4 of the reading device main body 1, the light shielding plate 67 is inserted into each of the photointerrupters 42. The position of the light box 6 on the film holder 5 is detected by intervening in the optical path provided in the vertical direction and blocking light.

As shown in FIG. 10, inside the light box 6, a light source 61 for film illumination, which is the external light source, is arranged above the light box 6, a heat shielding filter 62 is arranged below this, and a cooling fan 65 is attached to the -side. It is. A collimator lens 63 and a transmission diffusion plate 64 are arranged in a laminated manner at the bottom, and the lower surface of the transmission diffusion plate 64 is configured to face the film of the film holder 5.

The collimator lens 63 is provided to irradiate the film with the illumination light from the light source 61 that is diffused from below the light box 6 as parallel light. There is no shortage of light at the peripheral edge of the area (and a substantially uniform amount of light can be obtained).

The operation of reading an image on a photographic film using the film holder 5 and light box 6 constructed as described above will now be described. First, the operator holds either the slide mount or the film piece with the film holder 5 as described above, attaches the light box 6 to this, and then
Or, if you want to install it later, please use the reader body 1 as is.
It is installed in the opening 4 of the This attachment is performed using pins 58 and 58 located on the lower surface side of the substrate 5b, depending on the film held.
or 59 or 59 by fitting them into the holes 41, 41 provided in the seat plate 40 within the opening 4.

Then, by moving the light box 6 attached to the film holder 5 in the longitudinal direction of the film holder, the light box 6 is positioned over a desired image. Here, it is also possible to confirm the image more clearly by turning on the light source 70 of the reading head 7.

On the reading device side, the reading mode 4 is set in advance on the operation panel 3, so that the high-density reading unit 90 in the reading head 7 is positioned below the opening 4 on the nearest side. Move it. Then, by detecting the position of the light box 6, that is, the position of the image to be read, by the photo iterator 42, the 11th
As shown in the figure, the reading head 7 is moved in the sub-scanning direction to set the high-density reading section 9 of the high-density reading unit 90 to the reading start position of the image. When this is finished,
If the light source 70 of the reading head 7 is turned on, after turning it off, the light source 61 of the light box 6 is turned on to illuminate the image, and the high-density reading section 9 starts reading the transmitted light image. do.

In this embodiment, the film holder is configured so that its longitudinal direction matches the sub-scanning direction of the reading device, and an opening is provided in the front part of the top surface of the reading device to mount the film holder. It may also be configured to be mounted, for example, on the left side of the top surface of the reading device so as to match the main scanning direction. In other words, the direction in which the film images are arranged side by side is the main scanning direction of the document table.
Alternatively, by fixing it in line with the sub-scanning direction, if a high-density reading section is installed, the drive system and operation system for moving it can be shared with the existing reading section, and the increase in parts can be minimized. 5. This makes it possible to suppress cost increases. In this embodiment, an aperture-type fluorescent lamp is used as the light source when reading a reflective original, but instead of this, a structure may be used in which the direction of the reflective shade of a halogen lamp is changed, and a reflective original can be read at a high density. If the illuminance of the light source is insufficient when reading with A zoom optical system may be configured using lenses.

Furthermore, although a photointerrupter is used to detect the position of the film holder in the light box, the present invention is not limited to this, and a microswitch or the like may also be used. In addition, in this embodiment, the number of slide mounts that can be held in parallel on the film holder is two;
It goes without saying that a configuration that can hold more than one sheet is also possible.

[Effect] As described above, in the reading device according to the present invention, when reading a small transparent original such as a photographic film, a high-density reading section and a small The transmitted light image is read using an external light source. As a result, a high-resolution read image can be obtained without the need to enlarge and project the film image using a projector.
It is possible to prevent the device from becoming larger due to the use of a projector. The film is not placed on the document table (but is supported together with the holder in an opening next to the document table, so the image can be read accurately without shifting the position. Furthermore, the film is supported by an external light source and a parallel Since the lens that forms the light illuminates the image without waste, the illumination efficiency is increased and the luminous intensity at the periphery does not decrease, and approximately even luminous intensity is obtained over the entire image, so there is no shortage of light at the reading section. etc., the present invention has excellent effects.

[Brief explanation of the drawing]

1 and 2 are external perspective views of a reading device according to the present invention, FIG. 3 is a perspective view showing its internal structure, FIG. 4 is a vertical sectional view of the reading head, and FIG. 5 is a perspective view of its internal structure. A perspective view showing,
Figure 6 is a longitudinal sectional view showing the light hood installed.
8 and 8 are external perspective views of the film holder, FIG. 9 is an external perspective view showing how the light box is attached to the film holder, and FIG. FIG. 11 is a longitudinal cross-sectional view of essential parts showing how the light box and film holder are attached to the main body of the reading device.

Claims (1)

[Claims] 1. In an apparatus including a reading section that reads a reflected light image of an opaque original placed on a document table using irradiated light from a light source provided therein, a device near the document table a transparent original support unit that supports a transparent original with its original surface facing inside; an external light source that is provided above the transparent original supported by the transparent original support unit and illuminates the transparent original; a lens interposed between the external light source and the transparent original to form parallel light to irradiate the transparent original; and a lens provided inside to read a transmitted light image of the transparent original with high density by the reading unit. A reading device comprising: a high-density reading section.