JPH0458236A - Film image reader - Google Patents

Abstract

PURPOSE:To improve workability at the time of setting a carrier by displacing a light shielding means to the vicinity of a film original in response to the scanning of a scanning means. CONSTITUTION:A cam 41c which abuts on the light shielding plate 46 to change the position of the plate 46 is integrally provided on the lower surface of the base 41b of a scanning body 41, and a projection part 46b is provided on the plate 46 corresponding to the cam 41c. Then, the plate 46 is displaced downward by the cam 41c and positioned as shown by figure. In such a state, the plate 46 is positioned drastically downward by the scanning surface of the scanning body 41 and the carrier 26a or 26b is prevented from being butted by the slit- state aperture part 46a of the plate 46 even when the carrier 26a or 26b is set in the scanning body 41. When the scanning body 41 moves in a direction shown by an arrow to perform a reading action, the aperture part 46a of the plate 46 is displaced upward by the cam 41c and positioned extremely near to the film original, so that unnecessary harmful illuminating light is completely shielded. The reading action is performed by allowing the scanning body 41 to scan in a direction shown by an arrow in figure from this state.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a film image reading device that electrically reads an image of a transparent original such as a film using a photoelectric conversion element such as a COD.

<Prior Art> Conventionally, this type of film image reading device is configured as shown in FIG.

In the figure, a film F as a transmission original is illuminated by an illumination optical system 2 which includes a light source, a condensing lens, etc. in the main body 1 of the apparatus, and the film image, which is the transmitted light, is transmitted to a reflection mirror 3, a projection lens 4, and a reflection mirror. 5, 6, and 7 sequentially onto the pure 8. On the other hand, in the actual reading operation, the optical path is switched by rotating the movable reflection mirror 9 from the position shown by the solid line to the 45° position shown by the broken line. is,
The film F illuminated by the illumination optical system 2 is projected onto the sensor 13 via the reflection mirror 9, the projection mirror 1102 and the reflection mirrors 11 and 12 in order, and as the sensor 13 is scanned in the direction of the arrow in the figure, the film original F is It is configured so that the image information it has is sequentially read.

<Problems to be Solved by the Invention> However, in the conventional example described above, when projecting the film original F onto the Pure 8, it goes without saying that the entire image area of the film original F needs to be illuminated. Also, in the case of a reading operation, since the image plane +j-13 mechanically scans the projection surface of the film original F, the image I1
It is necessary to illuminate the entire area. On the other hand, the sensor 13 has a line-shaped photoelectric conversion section, and only the area corresponding to the photoelectric conversion section needs to be illuminated.
1* Since the entire surface is illuminated, there is a drawback that ghosts, flares, etc. occur due to the optical system such as the projection lens and reflective mirror, or the support mechanism that supports the optical system, which adversely affects the read image. Furthermore, in order to remove unnecessary harmful light such as ghosts and flares that adversely affect the read image, a slit ("a9 member") for removing harmful light may be provided near the film original. Even if a mechanism such as a carrier, magazine, etc. were used to place the film near the document, there was a limit.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide a film image IIA reading device that has a simple configuration and is not affected by unnecessary harmful light.

Means for Solving the Problems> In order to achieve the objects described in VI, the present invention includes an illumination optical system for illuminating a film original, and a photoelectric conversion method for an optical image from the film original illuminated by the illumination optical system. Film Image II! is equipped with a projection optical system that guides the image to the element, and sequentially converts the image information of the film original into electrical signals! The reading device includes a scanning means for scanning the film original, and a light shielding means for shielding harmful illumination light from the illumination optical system,
The light shielding means is configured to be displaced near the film original in response to scanning by the scanning means.

In the film image reading device configured as described above, the light shielding means for shielding harmful illumination light is located near the film original only during the reading operation in response to the scanning of the scanning means for scanning the film original. It becomes possible to arrange the film at the optimum position to remove harmful illumination light without being affected by the carrier supporting the film original.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

First, FIG. 1 is a perspective view showing a schematic configuration of a film image reading device. In the same figure, 21 is the i-place main body, 2
2 is an illumination optical system 23a consisting of an illumination lamp, a condensing lens, a field lens, etc.;

23b and 23G are reflective mirrors disposed along the projection optical path. 24 is a projection lens, and the reflective mirrors 23b and 2
3C, and the light image illuminated by the illumination optical system 22 and transmitted through the film original (not shown) is sent to the sensor 2 via the reflection mirrors 238 to 23C and the projection lens 24.
5.

The sensor 25 is a line sensor such as a CCD, and as the film original is scanned by a scanning system to be described later, the image information of the film original is sequentially converted into electrical signals. 26
26a and 26b are carriers that hold film originals, which are set in a scanning system to be described later, and can be set in both 26a (horizontal position) and 26b (vertical position) depending on the length and width of the film original. .

Figure 2 is this picture! l! The illumination optical system 2 of the reading device
2. A perspective view of a scanning system and a drive system is shown. In the same figure, 3
Reference numeral 1 denotes a pair of rails fixed to an apparatus main body 21 (not shown), on which a scanning body 41, which will be described later, reciprocates. 32
33 is a driven pulley, 33 is a driving pulley, 34 is a motor that drives the driving pulley 33, and 35 is a wire that is hung between the driven pulley 32 and the driving pulley 33 and is fixed to the scanning body 41. Therefore, the motor 34 is connected to the drive pulley 33. The scanning body 41 is moved via the driven pulley 32 and the wire 35.

A reflecting mirror 36 is fixed to the main body 21 of the apparatus and reflects the light beam from the illumination optical system 22. Also, I! 1 is an illumination optical system 22. During a reading operation, the scanning body 41 is first scanned to the optical axis A1 on the optical axis of the reading system passing through the projection lens 24 (not shown).

The scanning body 41 includes an upper support portion 41a and a base 41b, and is slidably supported on the rail 31 by a bearing 42 provided integrally with the base 41b. An aperture 43 is provided in the upper support portion 41a and the base 41b, and the illumination optical system 221 is passed through the aperture 43.
The film image back-illuminated by the reflective mirror 36 is checked. Also, the carrier 26 in the horizontal position
Openings 44 and 45 are provided corresponding to the set directions of carrier 26a and vertical position 26b, respectively.
By inserting 6b in the direction of the arrow in the figure, the film original is set.

Furthermore, 46 is a light shielding plate located on the optical axis 11, and the axis 47
The slit-shaped opening 46a is rotatably supported by a spring 48 and biased in the direction of the arrow (counterclockwise in the figure) by a spring 48.
It is designed to block out unnecessary light.

The operation of the scanning body 41 and the light shielding plate 46 of this embodiment with the above configuration will be explained using FIGS. 3 and 4.

FIG. 3 corresponds to FIG. 2 and shows the state when a film original is set. A cam 41C for changing the position of the light shielding plate 46 by contacting the light shielding plate 46 is integrally provided on the lower surface of the base 41b of the scanning body 41.
A C protrusion 46b is provided corresponding to 1C. The light shielding plate 46 is now displaced downward in the figure by the cam 41c and is at the position shown in the figure. In this state, the light shielding plate 46 is connected to the scanning body 41.
It is located far below the scanning plane of carrier 2.
Even when setting the carrier 6a or 26b on the scanning body 41, the carrier 26a or 26b does not come into contact with the slit-shaped opening 46a of the light shielding plate 46.

Therefore, when the scanning body 41 moves in the direction of the arrow in the figure for a reading operation, the opening 46a of the light shielding plate 46 is displaced upward by the cam 41G, resulting in the state shown in FIG. 4. Since the opening 46a of the light shielding plate 46 is located very close to the film original, it is possible to sufficiently shield unnecessary harmful illumination light. From this state, the scanning body 41 is scanned in the direction of the arrow in the figure, thereby performing a reading operation.

FIG. 5 shows a carrier 26 as a film supporting means suitable for use in the film image reading apparatus of this embodiment.

The carrier 26 has an upper support portion 51. It consists of a lower support part 52, each of which is supported at one end by a shaft 53 so as to be openable and closable, and an upper support part 51. The lower support part 52 has openings 51a and 52a, respectively, corresponding to the image area of the film F to be sandwiched.
is provided.

The film F is set in the open state shown in the figure, and then the upper support part 51 and the lower support part 52 are closed, and the film F
Film F is supported by sandwiching them. especially,
As described above, the opening 52a of the lower support part 52 is such that the slit-shaped opening 46a of the light shielding plate 46 is located near the film F during the reading operation, and that the film can be inserted into the carrier 26 in two directions, vertically and horizontally. Therefore, the opening 46a of the light shielding plate 46 does not come into contact with the lower support portion 52 during reading by forming the opening into a square shape.

<Effects of the Invention> As explained above, the present invention provides a light shielding plate that blocks harmful illumination light from the illumination optical system that illuminates the film original, and in response to the operation of the scanning system that scans the film original, By moving the light-shielding plate back and forth, it is possible to place the light-shielding plate in the optimal position for removing harmful illumination light, and it is also possible to move the light-shielding plate away from the scanning surface when setting a film original. The carrier and the light shielding plate do not come into contact with each other when setting the carrier, and the workability when setting the carrier can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a film image reading device according to an embodiment of the present invention, and FIG. 2 is an illumination optical system thereof. FIGS. 3 and 4 are side views showing the operation of the light shielding plate, FIG. 5 is a perspective view showing the structure of the carrier, and FIG. 6 is a perspective view of the main parts of the scanning system and drive system. FIG. 1 is a perspective view showing a schematic configuration of a film image reading device. 21... Apparatus main body, 22... Illumination optical system, 23a. 23b, 23c...Reflection mirror 24...Projection lens, 25...Sensor, 26.26a, 26b-...
Carrier, 32... Driven pulley, 33... Drive pulley, 34... Seven-pointer, 35... Wire, 41...
... Scanning body, 41a, ... Cam, 43 ... Aperture, 46 ... Light shielding plate, 46a ... Slit-shaped opening. Patent Applicant Canon Co., Ltd. Agent Patent Attorney 1) Mitsuharu Mura Diagram Diagram

Claims (1)

[Claims] 1. An illumination optical system that illuminates a film original, and a projection optical system that guides an optical image from the film original illuminated by the illumination optical system to a photoelectric conversion element, and sequentially converts image information of the film original into electrical signals. A film image reading device comprising: a scanning means for scanning the film original; and a light shielding means for shielding harmful illumination light from the illumination optical system, the light shielding means responding to scanning by the scanning means, A film image reading device characterized by being displaced near a film original.