JPH0285844A - Document illuminating device - Google Patents

Abstract

PURPOSE:To improve the operability by supporting a Fresnel lens rotatable by a mirror supporting member. CONSTITUTION:Between a Fresnel lens 7 and a document placing table 8, a document holding plate 13 supported by a holding plate supporting plate 131 is provided, and one end of the supporting plate 131 and a Fresnel supporting plate 71, and the other end are supported rotatable by a mirror supporting member 61, and a link plate 15, respectively. A parallel link mechanism is constituted of the member 61 and the supporting plates 71, 131, and the link plate 15, and the lens 7 and the holding plate 13 are contained in the member 61. Also, by pushing the member 61 in the direction as indicated with an arrow 18, a roller 17 rolls on the table 8, and folded like a chain line to a position V. In such a way, an operation for setting a transmission document onto the surface to be projected is simplified and the operability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a document illumination device applied to image forming devices such as image reading devices and copying machines, and in particular to a document illumination device that is applied to image forming devices such as image reading devices and copying machines, and in particular, to Concerning what illuminates the manuscript.

(Prior Art) Conventionally, this type of document illumination device has been applied to an image reading device as shown in FIG. 11, for example. That is, the original illuminating device 100 directs light from the light source 1010 to the original placing table 1 as the projection surface of the image reading device.
Projection means 103 for projecting onto 020 and Projection means 103
It includes a reflection mirror 104 that bends the light from the original table 1020 toward the document table 1020, and a Fresnel lens 105 that covers the document table 1020.

Then, 10 small transparent originals such as 35mm negative film
6, the transparent original 106 is illuminated by the projection means 10.
3 between the light source 1010 and the projection lens 107,
The transmitted light image is enlarged and projected onto the document table 1020, and the image is read by a reading means 108 such as a CCD disposed inside the main body of the apparatus.

On the other hand, when illuminating a relatively large transparent original such as an 8-inch x 10-inch film, place the transparent original on the original platen.
light source 1010 of the projection means 103
The transmitted original is illuminated by the light from the mirror 104 and the Fresnel lens 105, and the original is placed on the original placing table 1o20.
A transmitted light image is projected onto it. This transmitted light image is the device main body 11
3 is read by the internal reading means 108.

Furthermore, when reading reflective originals such as documents and drawings with the reading device, a Fresnel lens 105 on the original platen 1020 is used.
etc., the reflection mirror 1 is removed from the original table 1020.
04 and Fresnel lens 105 are separated. In order to facilitate attachment and detachment of the reflective mirror 104, etc., a Fresnel support plate 1 that supports the Fresnel lens 105 is provided.
09 to rotatably support the mirror support member 110 and integrate it as a mirror unit 111.
When the mirror unit 1 is not in use, the mirror unit 111 is removed from the main body 113 by bending it as shown by the chain line in the figure and unfitting the positioning pin 112 that positions the Fresnel support plate 109.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned prior art, although the Fresnel lens 105 and the reflection mirror 104 are made into a unit to facilitate attachment and detachment, it is difficult to illuminate a large transparent original. Then, it is necessary to remove the mirror unit 111 from the apparatus main body 113 one by one, place the transparent original on the document mounting table 1020, and then attach the mirror unit 111 to the apparatus main body 113 again, which makes the operation procedure extremely complicated. There was a problem.

Another disadvantage is that in order to separate the mirror unit 111 from the apparatus main body 103, a separate storage space is required for the mirror unit 111.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to illuminate the projection surface without removing the reflecting mirror or Fresnel lens when illuminating a relatively large transparent original. It is an object of the present invention to provide a document illuminating device on which a document can be set, thereby improving operability.

Another purpose is to save space by eliminating the need for storage space for reflective mirrors and Fresnel lenses.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a projection means for projecting light from a light source onto a projection surface, and a projection means for projecting light from a light source onto a projection surface. A document illumination device for projecting a transmitted light image of a transparent document onto the projection surface, the device comprising a reflection mirror that is bent in a direction, a mirror support member that supports the reflection mirror, and a Fresnel lens that covers the projection surface. , the Fresnel lens is rotatably supported by the mirror support member.

Further, the document holding member that presses the transparent document onto the projection surface may be rotatably supported with respect to the mirror support member.

Furthermore, the Fresnel lens supported by the mirror support member and the document holding member may be operated in conjunction with each other.

(Function) In the document illumination device having the above configuration, when placing a transparent document on the projection surface, the Fresnel lens is rotated relative to the mirror support member and separated from the document placement table. You can set and take out originals.

On the other hand, if the original pressing member is supported by the mirror supporting member, it is possible to prevent the transparent original from being wrinkled.

Furthermore, if the Fresnel lens and the document holding member are operatively connected, the projection surface can be opened and closed simply by rotating either one of them.

(Example) The present invention will be explained below based on the illustrated example. 1st
3 to 3 show an image reading device to which a document illuminating device according to an embodiment of the present invention is applied. This image reading device has a document mounting table 8 as a transparent projection surface on the upper surface. The document illumination device B includes a main body A of the apparatus, and a document illumination device B attached to the main body A of the apparatus.

The document illumination device B generally includes a projector C as a projection means that projects light from the light source 2 onto the document table 8, and a reflection mirror 6 that bends the projected light 5 from the projector C toward the document table 8. and a Fresnel lens 7 that covers the original table 8 from above. This reflecting mirror 6 and Fresnel lens 7 are unitized as a mirror unit D.

The projector C is fixed on a stand B1 provided in the main body A of the apparatus, and condenses light from a light source 2 with a condenser lens 3.
The front projection lens 4 irradiates light substantially parallel to the original table 8.

Between the projection lens 4 of this projector C and the light source 2, an original film l as a small-sized transparent original such as 35 mm film is placed.
is set, and an enlarged transmitted light image thereof is projected onto the document table 8. On the other hand, the reflecting mirror 6 is placed opposite the projector C, and the reflecting mirror 6 is arranged to face the projector C. It is supported at a predetermined angle with respect to the document table 8 .

The mirror support member 61 is connected to the stand B1 of the projector C by a connecting plate 14. The lower end of the connecting plate 14 is connected to the shaft B
2, the connection plate 14 is rotatably connected to the mounting base B1.
The upper end portion is rotatably connected to the upper end of the mirror support member 61 by a shaft 62 .

Further, the Fresnel lens 7 that covers the document table 8 is fixedly supported by a Fresnel support plate 71, with one end of the Fresnel support plate 71 connected to the mirror support member 61 via a shaft 72, and the other end connected to the link plate 15. Each is rotatably supported by a provided shaft 73.

A document holding plate 13 is arranged between the Fresnel lens 7 and the document table 8 so as to be in contact with the document table 8. This document holding plate 13 is a transparent plate-like member, and is supported by a holding plate support plate 131. The holding plate support plate 131 is rotatably supported at one end by the mirror support member 61 by a shaft 132 and by the link plate 15 by a shaft 133 provided on the link plate 15 at the other end, similarly to the Fresnel support plate 71 described above. There is.

As a result, the mirror support member 61. Fresnel support plate 71.
A parallel link mechanism is constructed by the presser plate support plate 131 and the link plate 15, and by lifting the handle 74 provided on the Fresnel support plate 71 shown in FIG. 3 in the direction of the arrow 16, the Fresnel The lens 7 and document holding plate 13 can be housed within the mirror support member 61.

By using the parallel link mechanism as described above, the first
Fresnel lens 7 and document holding plate 1 in the usage state shown in the figure
The distance h2 in the stored state shown in FIG.
can be made smaller.

On the other hand, rollers 17 are provided at both lower ends of the mirror support member 61.
is provided. This roller 17 is rotatably supported by a shaft 171 provided on the support member 61.

As a result, the mirror support member 61 as shown in FIG.
By pushing in the direction of the arrow 18, the roller 17 rolls on the original table 8, and is folded and stored up to a position V (dashed line in the figure) where the roller 17 hits the stopper B3 of the document table B1.

In this mirror unit storage state D', the roller 17
is on the right of the perpendicular line ■ passing through the axis 62, the moment around the axis B2 due to the gravity applied to the mirror unit D forces the roller 17 in the direction of the arrow 18', and the stopper B
Stably maintain the state where it hits 3. Therefore, in the mirror unit storage state D', the storage state can be maintained without particularly using latch parts or lock parts.

By placing the mirror unit D in the storage state D' in this manner, it can be used as a reflective original reading device conventionally used in copying machines etc. for reading reflective originals such as documents and drawings placed on the original placing table 8. Can be used.

On the other hand, when the mirror support member 61 is moved in the direction of the arrow 19 and the roller 17 is positioned to the left of the perpendicular line (for example, indicated by the broken line D'' in the figure), if the user releases his/her hand, the mirror unit D suddenly becomes the state shown by the solid line in the figure due to gravity, and an impact is applied to the shaft 62, the shaft B2, the mirror support member 61, etc.

Therefore, in this embodiment, a damper E is used to alleviate the above-mentioned impact. The damper E is rotatably supported at both ends by the shaft 63 of the mirror support member 61 and the shaft 143 of the connecting plate 14, respectively.

An example of a suitable damper E will be explained with reference to FIG.

FIG. 4(a) shows the expansion state in which the shaft 143 moves in the direction of arrow 20 with respect to the shaft 63, and FIG. 4(b) shows the compression state in which the shaft 143 moves in the direction of arrow 21 with respect to the shaft 63.

A piston E2 in the cylinder El is fixed to a piston rod E3, and the piston rod E3 projects outside the cylinder El through a seal E4.The piston E2 has a minute orifice E5 bored therein, and a valve E6 is disposed therein. Space Gl, G2 in cylinder El divided by piston E2
is filled with gas.

During expansion (see FIG. 4(a)), gas in space G2 flows through orifice E5 to space G1 as shown by arrow 22.
Since the gas flows through the orifice E5, a damper effect is obtained due to the resistance when the gas passes through the orifice E5.

On the other hand, during compression (see FIG. 4(b)), the position of the valve E6 changes from when it is expanded, so the gas in the space G1 passes through the piston rod as shown by the arrow 23, and does not pass through the orifice E5 into the space G2. Move to.

Therefore, there is almost no damper effect.

The damper E as described above is used on the front side of the device shown in FIG. 3 and on the back side of the device (not shown).

In Figure 1, when you release your hand at the position indicated by the broken line D'' in the figure,
The roller 17 rolls in the direction of the arrow 19. At that time damper E
Because it stretches, a damper effect is obtained.

Further, an arm 24 is connected between the mirror unit D and the connecting plate 14 in substantially parallel to the damper E. Arm 2
One end of the mirror unit 4 is rotatably supported on a shaft 63 protruding from the mirror unit D, and the other end is supported slidably on a shaft 144 of the connecting plate 14. The arm 24 is also provided at an opposing position (not shown).

On the other hand, when the roller 17 rolls in the direction of the arrow 19, the mirror support member 61 moves relatively slowly to the left due to the damper effect of the damper E, and the elongated hole 241 of the arm 24 moves toward the shaft 1.
The movement stops at the position where it hits 44. At this position, the mirror 6 is adjusted to a predetermined angle.

By using the damper E as described above, the shaft 62,
It was possible to prevent impact from being applied to the shaft B2, the shaft 144, the mirror support member 61, etc. In addition, the mirror support member 6
The variation in the angle of the reflecting mirror 6 when the mirror 1 is opened is also reduced. According to experiments, the variation in the repetition angle of the reflecting mirror 6 was on the order of several minutes to several tens of minutes. Mirror support member 6
Since the damper is compressed when the item 1 is returned to the storage position D', the damper does not work and the item can be stored smoothly without resistance.

In this embodiment, two dampers E were used, one in the front and one in midwinter, but the damper effect can also be obtained even if the damper E is used only in either the front or the back.

In the document illumination device of this embodiment, when projecting a small-sized document film 1 such as a 35 mm film or a slide film, first, as shown in FIG. This film carrier 10 has a transparent original film 1 sandwiched therebetween.
1 is shown in FIG. 3, the carrier hole 10 of the projector B is
2 and place the desired frame on the optical axis. Thereafter, an image reading operation is performed by performing a predetermined input from the operation panel A1 of the main body A of the image reading apparatus. The image is read by a reading element 12 such as a COD, and in this example, the image is read and scanned by scanning the mirror 9'. The image is formed on a reading element 12 via a fixed mirror 10 and an imaging lens 11.

Incidentally, in this embodiment, unlike the conventional example, the Fresnel lens 7 is not brought into close contact with the original table 8, but is arranged above with a space maintained therebetween. The reason for this is that the Fresnel lens 7 generally has a concentric or parallel microgroove structure on its surface, and when the Fresnel lens 7 is brought into close contact with the document table 8, the microgrooves disturb the read image. Adversely affect. As a way to prevent this, it is conceivable to make one side of the Fresnel lens 7 a matte diffusion surface, but this is not preferable because it causes a significant decrease in the amount of transmitted light.

For this reason, the Fresnel lens 7 is supported above the document table 8, and the groove of the Fresnel lens 7 is aligned with the lens 11 of the image reading device.
The camera was placed so that it was outside the focal range of the camera.

On the other hand, in this embodiment, in addition to 35 mm film and small slide film, the original may be large size film such as 8 inches x 10 inches, 4 inches x 5 inches, or O
HP films and the like can be read by transmitting illumination. FIG. 6 is a perspective view illustrating the case of transmitting illumination of the above-mentioned relatively large film. In the figure, document mounting table 8
A document placement reference 81 provided in the document placement reference 81 is a reference for placing a document when reading a normal reflective document (document, drawing, etc.).

When reading the original film 25 with an image reading device,
First, the transparent original standard sheet 26 is placed against the original placement standard 81.
Position and place. After that, the transparent original reference sheet 26
The original film 25 is positioned with respect to the placement reference 261 of the original film 25 . The transparent original reference sheet 26 is, for example, as shown in FIG. 7(a).
The L-shaped sheet shown in (b) or the transparent part 2 shown in (b)
62 and a colored portion 263 to indicate the placement reference 261, or the like may be used.

FIG. 8 is a side sectional view of the vicinity of the document pressing plate 13. FIG. 8(a) shows the case where there is no original film 25, and FIG. 8(b)
) shows the case where the original film 25 is placed on the transparent original reference sheet 26. The document presser plate 13 is supported with a backlash 134 relative to the presser plate support plate 131. Therefore, when there is no original, the original holding plate 13 is placed in close contact with the original placing table 8, but when there is an original, the thickness of the original film 25 is removed from the backlash 134 of the original holding plate 13.
The original film 25 is pressed against the original stacking table 8 by the weight of the original holding plate 13. By using the original holding plate 13 in this manner, the original film 25 is placed in close contact with the original placing table 8 without causing any placing defects such as sagging or waving on the surface.

FIG. 9 is a plan view when the original film 25 is placed on the original placing table 8, and FIG. A case where it is used as a film 251 is shown.

Further, FIG. 2B shows a case where a relatively small film such as a 4-inch by 5-inch photographic film is placed as the original film 252.

When using the transparent original reference sheet 26 applied to the large original film 251, when the large original film 251 is placed, the center of the Fresnel lens 7 (cross 71 in the figure) is placed approximately at the center of the original film 25. ing.

In this state, when the small original film 252 (indicated by the chain line in the figure) is positioned and placed with respect to the reference of the transparent original reference sheet 26, the Fresnel lens center 71 is aligned with the small original film 252.
It will be located far away from the center of 52. At a position away from the Fresnel lens center 71, the light intensity distribution is non-uniform, and this adverse effect is likely to appear.Therefore, as shown in FIG. By using the transparent original reference sheet 26' and arranging the Fresnel lens center 71 near the approximate center of the original film 252, the above-mentioned adverse effects are eliminated.

Further, the mirror support member 61 is provided with a sheet pocket 67 as shown in FIG. 10, in which a sheet N such as an original film or a transparent original reference sheet can be stored. This prevents various sheets necessary for the document illumination device, such as document film and transparent document reference sheets, from scattering and allows them to be easily stored.

In the above embodiment, the document illumination device is attached to an image reading device that reads images using a CCD, but it is not limited to the image reading device. It can also be used in image forming apparatuses such as machines.

(Effects of the Invention) The present invention has the above-described configuration and operation, and since the Fresnel lens is rotatably supported on the mirror support member,
The operation of setting the transparent original on the projection surface is simplified, and the operability can be significantly improved.

Furthermore, it is no longer necessary to attach and detach the reflecting mirror and Fresnel lens to and from the main body of the apparatus, thereby eliminating the need for extra space for storage.

Furthermore, if a document pressing member is provided, the transparent document can be brought into close contact with the projection surface, and wrinkles and the like of the transparent document can be prevented.

Furthermore, if the Fresnel lens and the document holding member are operatively connected, the operability will be further improved.

[Brief explanation of drawings]

1 and 2 are side sectional views showing a schematic configuration of an operating state of a document illuminating device according to an embodiment of the present invention, FIG. 3 is a schematic perspective view of the device in FIG. 1, and FIG. ), (b) is a vertical sectional view showing the operating state of the damper of the device in FIG.
The figure is a perspective view of the film carrier of the apparatus shown in FIG. 3, FIG. 6 is a schematic perspective view of the apparatus shown in FIG. 1 when reading a large-sized transparent document, and FIG. 7(a). (b) is a schematic perspective view showing an example of the document reference sheet in FIG. Figure (a),
(b) is a plan view of a transparent document placed on the document table, FIG. 10 is a perspective view of the mirror support member, and FIG. 11 is a schematic configuration of an image reading device to which a conventional document illumination device is applied. FIG. Explanation of symbols 1.25...Original film 2...Light source 6...Reflection mirror 7...Fresnel lens 8...Original mounting table 14...Connecting plate B...Original illumination device C. ...Projector (projection means) D...Mirror unit 4...Projection lens 61...Mirror support member 71...Fresnel support plate 13...Document holding plate A...Device main body E...・Dunbar Figure 9 (b) Figure 1O

Claims (3)

[Claims] (1) A projection means that projects light from a light source onto a projection surface, a reflection mirror that bends the light from the projection means toward the projection surface, a mirror support member that supports the reflection mirror, and a mirror support member that supports the reflection mirror; A document illumination device comprising a Fresnel lens arranged to cover a projection surface and projecting a transmitted light image of a transparent document onto a projection surface, the Fresnel lens being rotatably supported with respect to the mirror support member. A document illumination device comprising: (2) The document illumination device according to claim 1, wherein the document holding member that presses the transparent document onto the projection surface is rotatably supported with respect to the mirror support member. (3) The document illuminating device according to claim 2, wherein the Fresnel lens and the document holding member are operatively connected.