JPH06186649A - Picture reader and illumination device - Google Patents

Abstract

PURPOSE:To provide a picture reader which can read the color picture information of an original on which invisible information is formed besides the color picture information with an excellent S/N. CONSTITUTION:In the picture reader provided with a color reading light source 103 illuminating the original 101 so as to obtain the color picture information from the orignal 101 on which the invisible information is formed besides the color picture, an invisible light source 104 illuminating the original 101 so as to convert the invisible information of the original 101 to the visible information and an image pickup means 107 reading light reflected from the original 101 by the light sources 104 and 103; an invisible light elimination means 108 is provided between the light source 104 and the image pickup means 107 so that the invisible light from the light source 104 is not detected by the image pickup means 107.

Description

Detailed Description of the Invention

[0001]

[Industrial applications]

(Field of Industrial Use of the First Invention) The first invention relates to a means for reading invisible information on an image and a color copying apparatus for controlling color copying by the information. (Field of Industrial Application of the Second Invention) The second invention relates to an electrophotographic apparatus. (Field of Industrial Use of the Third Invention) The present invention relates to a copying machine for reading an image of a document and copying the image information, and an image reading apparatus for inputting the image information.

[0002]

[Prior art]

(First Conventional Example) In a conventional color copying apparatus, as means for controlling the copy prohibited image so that it cannot be copied, it is judged that the copy prohibited image is a copy prohibited image by recognizing the hue or pattern of the copy prohibited image. It was configured so that it cannot be done.

However, in this method, unless the hue or pattern of the copy-prohibited image is remarkably characteristic, the recognition rate as the copy-prohibited image is deteriorated, and a general image is erroneously recognized as a copy-prohibited image and cannot be copied. is there.

Therefore, recently, invisible information that is invisible is added to a copy-prohibited image by using a special ink or the like, the invisible information is visualized by a specifying means, and the information is recognized. You are trying to determine a copy-protected image.

Usually, an invisible fluorescent paint is used as the special ink, and it is converted into visible fluorescent light by irradiating it with ultraviolet light. As a result, the general image and the copy-prohibited image are clearly characterized, and the recognition rate of the copy-prohibited image can be improved. (Second Conventional Example) FIG. 5 is a schematic sectional view showing a conventional example of an electrophotographic apparatus.

In FIG. 5, a rod-shaped light source 120 such as a halogen lamp has a longitudinal direction in a direction perpendicular to the paper surface of FIG. 5, and similarly, regarding each element, the sectional shape of FIG. 3 continues in the direction perpendicular to the paper surface of FIG. To do.

Of the light emitted from the rod-shaped light source 1101, directly or the main mirrors 1102, 1103, 1104.
Alternatively, part of the light reflected by the side mirrors 1105 and 1106 (not shown) is part of the document surface 1111 on the document table 1110.
Reach Further, of the light that reaches the document surface 1111 and is diffusely reflected by the document (not shown) on the document table 1110, only the light that has passed through the fixed slit hole 1171 is reflected by the reflection mirror 1108.
1109, 1112, 1114 and imaging lens 1113
After that, the surface of the drum 1115 is irradiated with effective light for image formation. The description of the image forming method on the drum surface and other components will be omitted in the present invention.

Next, FIG. 6 shows main mirrors 1102 and 110.
3 is a view for explaining a method of mounting the side mirrors 1105 and 1106 to the side mirrors 1105 (reflection mirrors 1102 and 110).
3 is not shown).

Main mirrors 1102, 1103, 110
Reference numeral 4 is inserted into the holes formed in the side mirrors 1105 and 1106 and is fixed by supporting. However, in this figure, the side facing the light source is a reflecting surface for each of the reflecting mirrors.

In the present invention, the reflection mirrors 1102 and 11
Reference numerals 03, 1104, 1105 and 1106 denote rod-shaped light sources 110.
This is for efficiently condensing the light from 1 on the document surface on the document table.

However, in general, when a halogen light source or the like is used as the rod-shaped light source, the main mirrors 1102, 1
It is known that 103 and 1104 thermally expand in the longitudinal direction under the influence of heat radiation of a light source when using an electrophotographic apparatus (currently, as a reflecting member of the main mirror, an aluminum plate is provided with a reflection enhancing film). Since it is known that the temperature near the halogen lamp rises to about 250 ° C, it is expected that the expansion of about 1.6 mm will occur in the case of aluminum with a coefficient of linear expansion of 2.313 × 10. This thermal expansion (the longitudinal direction of the main mirror is set to 300 mm) causes a problem such as distortion of the reflection mirror).

In order to solve this problem, the main mirror 1
The insertion portions e, f of the 102, 1103, 1104 are made longer by the amount of thermal expansion, and the side mirror 110
5, 1106 are main mirrors 1102, 1103, 11
It is designed to be arranged at a position where 04 does not collide with the reflection region tip Z when thermally expanded. (Third Conventional Example) FIG. 13A shows a schematic diagram of an optical system of a copying machine for explaining a third conventional example.

Reference numeral 1301 denotes a light source for illuminating the original 1303,
Reference numeral 1302 is a platen glass, 1305 is a reflection mirror that reflects the light beam 1304 reflected from the original 1303 and directs it to the lens 1306, and 1307 is a second reflection mirror that reflects the light beam 1304 emitted from the lens to the photosensitive drum 1308. Reference numeral 1311 denotes a lens base on which the lens is placed, and the lens is arranged on this base.

Here, the original platen glass 1302 is moved from a in the direction of arrow b, and the photosensitive drum 1308 is rotated in the direction of arrow d while illuminating the portion c with the light source 1301, and in the electrophotographic process (not shown). Embodied on paper.

At this time, on the rotating photosensitive drum 1308,
Two reflection mirrors 130 that pass through the lens 1306 and
If a light beam other than the effective light beam 1304 reflected at 5, 1307 is emitted, a good image cannot be obtained.

For example, on the upper surface of the lens base 1311, the lens 1
When the light flux from 306 is reflected and the reflected light 1340 irradiates the surface of the drum 1308, flare occurs, and the flare overlaps the effective image light flux, and the image contrast may be extremely low and the image quality may be deteriorated. As for the flare, the contrast decreases as the amount of light is larger than that of the effective luminous flux.

Conventionally, in order to reduce such reflected light (flare), paint having a reflectance lower than that of the surface of the lens base 1311,
For example, there is one in which a black matte paint is applied to the surface of the lens base 1311.

FIG. 13B shows another example of the third conventional example.

The lens 1360 is a zoom lens, and is engaged so as to be movable left and right in the drawing so that the copy magnification can be changed. (The zoom lens of the copying machine and the moving technology of the lens are not described here because they are already known techniques.) The lens 1360 is located at the position 136 during the enlargement copy.
Move to 1. The flare that tends to occur at this time is 1341. Further, the lens 1362 is a lens position when performing reduction copying, and at this time flare light 1342 is likely to occur.

In order to reduce the occurrence of flare, an antireflection member (for example, black sponge) is provided on the upper surface of the lens base 1311 or the lower surface of the lens hood, or black coating is performed.

FIG. 14 shows still another example of the third conventional example. FIG. 14 shows the image forming arrangement of the optical system as viewed from above in the conventional example of FIG. The lens is at the position 1306 at the same magnification and moves to the position 1306 'at the time of magnification 1306'. At this time 13
The light ray indicated by 43 becomes flare light. This flare light increases as the magnification increases.

Conventionally, the member 1343 in the light advancing direction is colored black to shield light. Further, as another method, FIG.
The method as shown in FIGS. 15 (a) and 15 (b) was adopted.

That is, a black mylar 1369 'for fixing one end to the lens barrel 1306 or a black bellows 136.
9 is provided so that flare light (for example, 1343 in FIG. 14) is blocked as the lens 1306 moves.

Further, FIG. 16A is an enlarged view of a cross section of the bellows 1369. The material is made of a black resin or the like having a low transmittance so as not to transmit the light flux, and the surface is formed with a plurality of thin rectangular light-shielding line reflection shapes.

[0025]

[Problems to be Solved by the Invention]

(First Problem) However, in the first conventional example, the solid-state imaging device that converts the invisible information on the copy-prohibited image into visible information by an ultraviolet light source or the like and reads the visible information when recognizing the ultraviolet light is used. When the light emission spectral region of the light source has sensitivity, the S / N ratio of the image information (ratio between the amplitude of the signal to be received and the amplitude of the noise signal) becomes poor, and it cannot be recognized as a copy prohibited image. (Second problem) Further, in the second conventional example, the main mirror 1
102, 1103, 1104 and side mirrors 1105.
A portion close to 1106 has a gap at the time of design as shown in FIG.

Therefore, the main mirrors 1102 and 110
The maximum thermal expansion amount of 3,1104 is 2 × S, and the length of the effective reflection area of the main mirrors 2, 3, 4 in the longitudinal direction is L,
When L = l + 2S, the main mirrors 1102 and 11
In the initial stage of the thermal expansion process of 03, 1104, the light amount decreases at both ends of the illuminance distribution on the document surface, and the illuminance distribution on the document surface changes with time during the thermal expansion process, which may cause deterioration in image quality. .

When L = 1, the side mirror 1
The distances of the light sources 105 and 1106 from the light source increase, which may cause a decrease in light collection efficiency and an increase in size of the entire device. (Third Problem) However, the third conventional example has the following problems.

1: Antireflection coating is applied after the treatment process of coating.
A drying process is required, and the drying time and the space for drying become large, which is inevitably expensive in the manufacturing process.

2: The antireflection coating is effective because the coating may peel off over time and the antireflection effect does not continue, and the peeled coating floats inside the device and adheres to other members such as mirrors. It may block the image light flux and deteriorate the image quality.

3: The light-shielding line on the surface of the conventional light-shielding plate has a ridge line in a direction parallel to a tangent line of a concentric circle having the optical axis of the lens 1306 as an axis, and is surrounded by the ridge line and the valley line. The “angle of the surface” may change due to the movement of the lens 1306 or the like, and the light flux transmitted through the lens 1306 at a certain specific magnification may be reflected before being directed to the reflection mirror 1307, resulting in flare light. It was

In order to prevent this, it is necessary to further change the surface angle of the antireflection light-shielding line member 1369 to make the angle acute as shown in FIG. 16B. However, when the light-shielding line is formed on the resin member. Had to make the resin substrate thicker in order to deepen the valley line. This means that more resin material is required, which is expensive and makes the device large and heavy.

Regarding the angular arrangement design of the surface of the light-shielding line, the frame member is arranged close to the optical path due to the space saving of the optical system accompanying the downsizing of the copying machine itself, and the degree of freedom in design is further reduced. However, antireflection design is becoming difficult.

As one of the multifunctional functions, the range of lens movement is widened as the zoom magnification is increased, the optical path is complicatedly moved, and a wide antireflection angle is required as an antireflection member, or an area where painting is required. Is becoming wider. Against this background, it is extremely difficult to deal with the problem in the conventional example. (First Object) The first invention is made to solve the first problem, and an object thereof is to provide color image information of a document in which invisible information is formed in addition to color image information. An object of the present invention is to provide an image reading device capable of reading with a good S / N ratio. (2nd object) The 2nd invention was made in order to solve the 2nd subject, and the purpose is that the illuminance distribution is spatially and temporally even if it is thermally expanded by a rod-shaped light source. It is to provide a lighting device that does not easily change. (Third object) A third invention is made to solve the third problem, and an object thereof is to provide an illuminating device which does not generate flare light at a low cost.

[0034]

[Means for Solving the Problems]

(First Invention) In order to achieve the first object, in the first invention, color reading is performed by illuminating a document on which invisible information is formed in addition to a color image to obtain color image information from the document. A light source; an invisible light source for illuminating the document to convert the invisible information of the document into visible information; and an image pickup unit for reading the reflected light from the document by the invisible light source and the color reading light source. In the image reading apparatus, invisible light removing means is provided between the invisible light source and the imaging means so that the invisible light from the invisible light source is not detected by the imaging means. (Second invention) Further, there is provided a reflecting means for condensing the light from the rod-shaped light source on the original surface, the reflecting means being a main reflecting means parallel to the longitudinal direction of the rod-shaped light source and a longitudinal direction of the main reflecting means. In a lighting device comprising side reflecting means supported on both sides of the direction via reflecting means supporting portions, the reflecting means supporting portion is a member different from the side reflecting means. Alternatively, a fitting hole formed in an ineffective reflection portion formed of a reflection area other than the effective reflection area of the reflection means, and both side edges of the main reflection means movably fitted in the fitting hole. It is characterized in that it comprises a fitting protrusion that is provided so as to protrude.

Further, it is desirable that the side reflection means be attached to the support member or integrally formed.

Further, it is preferable that the reflecting surface of the side reflecting means is perpendicular to the opposite surface of the main reflecting means.

Further, the reflecting surface of the side reflecting means may be a plane which is not perpendicular to the reflecting surface of the main reflecting means.

Further, the reflecting surface of the side reflecting means may be composed of two or more plural surfaces or may be a curved surface.

Further, the supporting member may be movable with respect to the main reflecting means. (Third invention) Further, in an image reading apparatus provided with an optical system for guiding reflected light from a document and a light shielding member having a light shielding line for preventing irregular reflection of the reflected light inside the apparatus, It is characterized in that the direction of the ridgeline of the light-shielding line is formed obliquely with respect to the direction of the tangent line of a concentric circle centered on the optical axis of the optical system.

Further, it is preferable that the angle formed by the direction of the ridgeline of the light-shielding line of the light-shielding portion and the direction of the tangent of a concentric circle centered on the optical axis of the optical system is in the range of approximately 20 to 70 degrees.

It is more preferable that the angle between the ridgeline of the light-shielding line of the light-shielding portion and the direction of the tangent to a concentric circle centered on the optical axis of the optical system is in the range of approximately 30 to 60 degrees.

Further, it is preferable to reinforce a part or the whole of the light shielding member with a rigid member.

Further, it is preferable to apply tension to the end portion of the light shielding member for installation.

Further, in order to make the length of the light-shielding line of the light-shielding member variable according to the change in the positional relationship of the optical system, it is preferable to provide a winding means at the end of the light-shielding member.

Further, the light-shielding line of the light-shielding member may be formed by bonding and connecting the parallel side portions of the sheet-shaped side edge member.

It is also possible to combine two or more kinds of angles formed by the tangential direction of a concentric circle centered on the optical axis of the optical system and the direction of the ridge.

[0047]

[Action]

(Operation of the first invention) In the first invention, since the invisible light removing means is provided between the invisible light source and the imaging means,
Invisible light from the invisible light source is not detected by the imaging means,
Since only the visible information converted from the color image information and the invisible information is detected by the image pickup means, noise due to the invisible light is eliminated, and reading with less misjudgment is performed. (Operation of the second invention) In the second invention, the reflecting means supporting portion is composed of a supporting member which is a member different from the side reflecting means or a reflecting area other than the effective reflecting area of the reflecting means. Since the fitting hole formed in the ineffective reflection portion and the fitting projections protruding from both side edges of the main reflecting means, which are fitted into the fitting hole so as to be movable, are provided, Even if thermal expansion occurs due to thermal expansion, the reflecting means is not distorted, and since the area of the effective reflecting area of the side reflecting means does not change, the illuminance distribution on the original surface can be measured locally and temporally. Can be homogenized. (Operation of the third invention) In the third invention, the light flux which is emitted by the light-shielding line and is reflected by the oblique light-shielding member is directed in the direction away from the optical axis, so that it is not directly applied to the photoreceptor. Therefore, it is possible to prevent image deterioration. Therefore, the amount of reflected light can be reduced even with a member having a higher reflectance than in the past, and thus it is possible to use a cheaper material.

Further, there was a sufficient effect if the oblique relative angle between the ridge of the light-shielding line and the tangent to the concentric circle is in the range of about 20 to 70 °.

Further, when tension is applied, loosening of the sheet can be prevented, so that an accident of blocking the effective optical path can be prevented,
It is possible to obtain stable image quality.

Further, when the winding means is provided, the winding space for preventing loosening is reduced and the apparatus can be downsized.

When the edge members are attached to each other, small pieces can be effectively used and waste of resources can be reduced.

As described above, according to the present invention, with a simple structure,
It is also effective for further downsizing of the copying machine itself, improvement of image quality such as image uniformity, expansion of functions, energy saving, and cost reduction.

[0053]

【Example】

[Embodiment of the First Invention] (First Embodiment) A reading system embodying the present invention will be described below with reference to FIG.

In the figure, reference numeral 101 denotes a copy-prohibited image, which is a document on which invisible information is formed in addition to the color image. 102 is a platen glass, 103 is a color reading light source using a halogen lamp, 104 is an ultraviolet light source as an invisible light source for converting the invisible information into visible light information, 105 is a scanning mirror, and 106 is an imaging lens. Reference numeral 107 denotes a 3-line CCD as an image pickup means, and 108 denotes an ultraviolet cut filter as an invisible light removing means.

Next, the copying operation will be described. First, the ultraviolet light source 104 is turned on to determine whether the original is a copy-prohibited image.

FIG. 1 shows the spectral characteristics of this ultraviolet light source 104.
It shows in (b). Then, the original 1 is scanned by the scanning mirror 105.
Scan 01 to read the image information. At this time, in the case of a general image, even if the ultraviolet light source 104 is irradiated, it does not emit visible light, so that the output from the CCD 107 cannot be obtained. Therefore, when no output is obtained, it is determined that the document is a general document.

Next, when the output is obtained, it is compared whether or not the read signal is the information recorded in the copy-inhibited image in the image using, for example, a fluorescent marker. A normal method of recognizing a copy prohibited image may be used for this portion. When this reading is performed, 111a, 1a in FIG.
When the CCD 107 has the three-color spectral characteristics as shown in 11b and 111c, the light from the ultraviolet light source 104 is transmitted to the CCD 107.
However, since it is detected, even if the information is read from the copy prohibited image, the S / N ratio of the signal is deteriorated and the recognition level of the information is deteriorated.

Therefore, by providing a filter for cutting ultraviolet rays having a spectral characteristic as shown by 110 in FIG. 1 (c) as in the present invention, the output of the CCD 107 is only information of visible light from the original 101. obtain. As a result, when the ultraviolet light source 104 is irradiated, what is detected by the CCD 107 can be limited to only the fluorescent paint and the signal from the copy-prohibited image, and reading with less misjudgment is performed.

When it is determined that the document is a general document based on the above-mentioned read information, the halogen lamp 103 is turned on, and then the normal color image is read and copied. If it is determined that the image is a copy-prohibited image, copy-prohibition control is performed. (Second Embodiment) If the ultraviolet cut filter 108 is shared with the cover glass of the CCD 107 as shown in FIG. 2, no separate component is needed.

The same effect can be obtained by adding the function of the ultraviolet cut filter to any one of the mirrors 105 used on the way to reach the CCD 107. [Embodiment of the Second Invention] (Third Embodiment) FIG. 3 is a view showing a third embodiment of the second invention, in which a main mirror 2 serving as a main reflecting means.
04 and side mirrors 227, 2 as side reflection means
28 shows a supporting method of No. 28. Main mirror 20
Reference numeral 4 designates a length of the effective reflection area in the longitudinal direction as 1 (equal to the effective reflection area L in the conventional example), and is inserted into the support member 225 and the hole 225a as a fitting hole in the support member 226 so as to be supported. e and f.

The side mirrors 227 and 228 are located on the light source side with respect to the supporting members 225 and 226 so that the reflecting surfaces face each other, and the holes formed in the supporting members 225 and 226 are not blocked. , Fitting protrusion e,
f is fitted.

However, the mirror 202 and the mirror 203 (not shown) are also supported in the same manner as the mirror 204.

FIG. 4 is a view showing the fourth to tenth embodiments of the third invention, in which a main mirror 204 and a side mirror 2 are provided.
29 shows the shapes of 29 and the support member 226. Each example will be described below. (Fourth Embodiment) Support member 226 for main mirror 204
The side mirror 229 and the side mirror 229 are integrally molded so as to have different levels, and the main mirror 204 is inserted and supported in a region other than the effective reflection region of the side mirror 229. (Fifth Embodiment) Support member 226 for main mirror 204
Side mirror 229 smaller than the main mirror 20
4 and the side mirror 2
The reflecting surface 29 is a plane perpendicular to the reflecting surface of the main mirror 204. The main mirror 204 is the side mirror 2.
Independently of 29, it is inserted into and supported by a support member 226 of the main mirror 204. (Sixth Embodiment) Support member 226 for main mirror 204
Side mirror 229 smaller than the main mirror 20
4 and the side mirror 2
The reflecting surface 29 is a plane that is not perpendicular to the reflecting surface of the main mirror 204. Further, the main mirror 204 is independent of the side mirror 229, and the supporting member 22 of the main mirror 204 is
It is inserted in and supported by 6. (Seventh Embodiment) Support member 226 for main mirror 204
Side mirror 229 smaller than the main mirror 20
The reflecting surface of the side mirror 229 is made into a bent surface or a curved surface formed by two or more plural surfaces while being bonded to the fourth supporting member 226. Further, the main mirror 204 is inserted and supported by a support member 226 of the main mirror 204 independently of the side mirror 229. (Eighth Embodiment) Support member 226 for main mirror 204
Side mirror 229 smaller than the main mirror 20
The supporting member 226 is attached to the supporting member of No. 4 and is movable with respect to the main mirror 204. At this time, the main mirror 204 is inserted and supported by the support member 226 of the main mirror 204 independently of the side mirror 229. (Ninth Embodiment) Support member 226 for main mirror 204
Side mirror 229 smaller than the main mirror 20
4 is attached to the support member 226 of the main mirror 20.
A cut portion for adjusting the amount of light is provided at the end of 4 (close to the side mirror 229), and the side mirror 229 is used as the main mirror 2.
The light amount is adjusted by sliding with respect to 04. At this time, the main mirror 204 is inserted and supported by the support member of the main mirror 204 independently of the side mirrors. (Tenth embodiment) Support member 22 for main mirror 204
A side mirror 229 smaller than 6 is used as the main mirror 2
The main mirror 2 is attached to the support member 226 of No. 04.
A cutout portion for adjusting the light amount is provided at the end of 04 (close to the side mirror), and the main mirror 204 is moved in the longitudinal direction of the light source while the side mirror 229 is fixed to adjust the light amount. At this time, the main mirror 204 is inserted and supported by the support member 226 of the main mirror 204 independently of the side mirror 229. (Eleventh Embodiment) Support member 22 for main mirror 204
Even when 6 and the side mirror 229 are integrally molded, the same configurations as those in Examples 3 to 8 are possible (not shown).

In the third embodiment, it is possible to make the illuminance distribution on the original surface uniform both spatially and temporally and to achieve high illumination efficiency regardless of the thermal expansion of the main mirror 204 due to the radiant heat of the light source 201. Has the effect of becoming.

The fourth to eleventh embodiments have the following effects in addition to the third effect. In the fourth embodiment, the cost of the device can be reduced by reducing the number of parts of the entire device and the reflection area of the side mirror 229.

In the fifth embodiment, since the reflection area of the side mirror 229 can be made small, it is possible to use a single and expensive reflecting surface having a high reflectance without changing the cost of the entire device, and to improve the illumination efficiency. An expensive device can be provided. In addition, the reflecting surface of the side mirror 229 is used as the main mirror 204.
By using a plane that is perpendicular to the reflective surface, it is possible to provide a lighting efficiency equal to or higher than the conventional one with a device that is simple to manufacture.

In the sixth and seventh embodiments, the side mirror 2
29 can be arranged at an arbitrary angle with respect to the main mirror 204 or at an arbitrary bent surface or curved surface,
It is possible to obtain the optimum light amount distribution on the document surface.

In the eighth embodiment, it is possible to make a finer adjustment than before without creating a gap between the side mirror 229 and the main mirror 204 at the time of assembling and adjusting for the variation of the single lamp, and to set the side mirror 229 to the optimum position. Since they can be arranged, it is possible to obtain the optimum light amount distribution on the document surface.

In the ninth embodiment, it is possible to arbitrarily and finely adjust the light quantity at the end of the main mirror 204, and it is possible to obtain an arbitrary light quantity distribution on the document surface.

In the tenth embodiment, it becomes possible to arbitrarily and finely adjust the light amount balance between the front side and the back side on the document table.

In the eleventh embodiment, the number of parts is small and the effects of the fourth to tenth embodiments can be satisfied at the same time. [Embodiment of the Third Invention] (Twelfth Embodiment) A twelfth embodiment is shown in FIG.

A light-shielding member having a light-shielding line whose ridge line is oblique with respect to a tangent line of a concentric circle centered on the optical axis of a lens (not shown) is arranged as a member around the optical path. The location is shown in Figure 1.
This is a problem in 3 and 14.

FIG. 8 shows an example in which this light-shielding line is formed on the surface of a resin plate or the like. Reference numeral 306 (see FIG. 9) is a lens as an optical system, 309 is a light blocking member, 310 is the optical axis of the lens, 31
2 is a tangential direction of a concentric circle of the optical axis 310, and 313 is one of ridge lines of the light shielding member 309. The ridgeline 309 of the light-shielding member is formed at an angle of about 30 degrees with respect to the tangential direction 312 of the concentric circle of the optical axis 310 of the lens 306.

The arrangement angle of the ridgeline 309 is about 30 degrees to 6 degrees.
If it is 0 degree, the flare light flux when used in the optical system of the copying machine can be almost attenuated to a level that does not cause image deterioration by the time it reaches the photosensitive drum.

That is, the light beam slightly reflected on the surface between the ridges is not immediately directed to the photosensitive drum 1308, but irradiates other members inside the apparatus and repeats reflection with diffusion and attenuation, It may reach the photosensitive drum 1308. However, even in this case, the light flux applied to the drum 1308 is sufficiently attenuated, which is not a problem.

For example, when the reflectance per one time when the member is irradiated and reflected is about 3%, the light quantity is not sufficiently low with respect to the drum sensitivity, and even when the image quality is deteriorated, the light quantity is twice. When reflected, it becomes 3% × 3% = less than 0.1%, the reflected light (flare light) is sufficiently low, and the influence on image deterioration is not a problem.

It is generally considered that the optimum angle (α) between the ridgeline 313 of the light shielding member 309 and the tangential direction of the concentric circle of the lens optical axis 310 is α = 45 °. α
The case of = 0 ° is the conventional example itself. Also α = 90 °
In the case of, the ridge line 313 of the light blocking member 309 is the lens optical axis 31.
It becomes parallel to 0, and there is no point in forming the light blocking member 309 as a light blocking line. Therefore, in order to sufficiently obtain the effect of the present invention, α is preferably set to approximately 20 ° to 70 °.

On the other hand, when the optical system has a function of magnification, each of the parts of the optical system changes its positional relationship in accordance with the magnification change, so that the above-mentioned α is approximately 30 ° or more.
It becomes 60 °.

In the image reading device, in addition to optical parts such as lenses and mirrors, various members such as motors for driving these and drive system parts such as gear rails, side walls, bottom walls and columns are arranged near the optical system. The positional relationship is different for each device. Therefore, the best α needs to be optimized for each device. (Thirteenth Embodiment) A thirteenth embodiment is shown in FIG. The optical system moves inside the device to change the magnification, and light-shielding plates 309a and 309b are provided so as to close the gap between the moving optical system (306 → 306 ′) and the fixed portion.

The antireflection members 309a and 309b are oblique light-shielding line anti-reflection members obtained by processing light-shielding lines having oblique ridges on the surface as shown in FIG.

309a and 309b are movably attached to the optical system 306, and are 306 (at the same magnification) or 306 '.
309a 'and 309 respectively when moved to (when enlarged)
Move like b '.

FIG. 12A shows a method of forming a light shielding member of the present invention, which is formed by pressing a sheet metal substrate.

In the figure, a indicates a press die (other parts of the press machine are omitted). As shown in the drawing, a has a pair of upper and lower undulating grooves formed in the front direction. The corrugations are configured to fit well when a is in the pressed state.

Reference numeral b denotes a rectangular sheet metal substrate, which is press-formed by a and formed into a wavy shape. At this time, the sheet metal b is set and pressed at a predetermined angle with respect to the ridge line of the press die, and the light shielding line of the present invention is formed.

If a sheet metal substrate that has been blackened (painted in black) and has a light blocking effect is used, only the above-mentioned press work is required. On the other hand, when a sheet metal substrate having a bright metal surface is used, blackening treatment (black coating) is required after the press working.

FIG. 12B shows a method for forming a light-shielding member of the present invention, in which a sheet-shaped substrate is processed by passing it between a pair of rotating rollers a having an uneven surface.

Reference numeral a in the figure denotes a pair of rotating rollers, each of which has an uneven groove on its surface and rotates in the direction of the arrow. The distance between the two rollers can be maintained at about the thickness of the sheet substrate. Reference numeral b indicates a sheet-like substrate, which is forcibly passed between the rollers a and a wavy light-shielding line is formed.

The substrate material b is a thin metal plate, a resin sheet or the like. If the substrate material that is black and has a light blocking effect is used, only the above processing is required, but if the light blocking effect is not sufficient,
It is necessary to blacken after processing. (Fourteenth Embodiment) A fourteenth embodiment is shown in FIG.

In this embodiment, the lens 30 is adjusted according to the magnification change.
In the image reading device in which 6 moves, the end of the light-shielding line 309 of the present invention is connected to the end of the lens 306, and the other end of 309 is connected to the winding device 315 (FIG. 10). Is a sectional view).

The light shielding line 309 is made of resin and has a sheet shape. The ridgeline of the light-shielding line is formed at a predetermined angle with the tangential direction of the concentric circle of the lens optical axis.

The winding device 315 as a winding means applies tension to one end of the light-shielding wire 309 so as to constantly prevent slack. (Fifteenth Embodiment) A fifteenth embodiment is shown in FIG.

In this embodiment, the movable lens 306 is connected to the light shielding line 309 of the present invention. Shading line 309
Since the sheet is sheet-like and has insufficient strength, the reinforcing members 314a and 314b are used as rigid members.

One end of the light shielding line 309 is fixed to the lens 306, and the other end is fixed by a fixing member 314h in the reading device. Except for both ends, it is reinforced by 314a. 314a is formed of an elastic material, and the light-shielding line 3
09 is always tensioned to prevent slack. (Sixteenth Embodiment) A sixteenth embodiment is shown in FIG.

This embodiment shows one of the methods of forming the light-shielding line of the present invention. This is a configuration in which parallel quadrilateral sheet-shaped cut-off members are bonded by connecting parallel sides. FIG. 11 (b)
Then, the light shielding member is formed by alternately joining two types of parallelograms. This forming method takes time to form, but it can be formed relatively easily without using a large press machine or mold, so it is suitable for when a large number of small quantities of various kinds are needed for the initial inspection of the light blocking member. It is a forming method.

[0095]

【The invention's effect】

(Effect of the first invention) In the first invention, since the invisible light removing means is provided between the invisible light source and the imaging means,
Invisible light from the invisible light source is not detected by the imaging means,
Since only the visible information converted from the color image information and the invisible information is detected by the image pickup means, noise due to the invisible light is eliminated, and reading with less misjudgment is performed. (Effect of the Second Invention) In the second invention, the supporting means for the reflecting means comprises a supporting member which is a member different from the side reflecting means, or a reflecting area other than the effective reflecting area of the reflecting means. Since the fitting hole formed in the ineffective reflection portion and the fitting projections protruding from both side edges of the main reflecting means, which are fitted into the fitting hole so as to be movable, are provided, Even if thermal expansion occurs due to thermal expansion, the reflecting means is not distorted, and since the area of the effective reflecting area of the side reflecting means does not change, the illuminance distribution on the original surface can be measured locally and temporally. Can be homogenized. (Effect of the third invention) In the third invention, since the light beam reflected by the light-shielding line that is applied to the oblique light-shielding member is directed away from the optical axis, it is not directly applied to the photoreceptor. Therefore, it is possible to prevent image deterioration.

Therefore, even a member having a higher reflectance than before can reduce the amount of reflected light, so that a cheaper material can be used.

Further, if the oblique relative angle between the ridgeline of the light-shielding line and the tangent to the concentric circle is in the range of about 20 to 70 °, there was sufficient effect.

Further, when tension is applied, loosening of the sheet can be prevented, so that an accident of blocking the effective optical path can be prevented,
It is possible to obtain stable image quality.

Further, when the winding means is provided, the winding space for preventing loosening is reduced and the apparatus can be downsized.

When the edge members are attached to each other, small pieces can be effectively used and waste of resources can be reduced.

As described above, according to the present invention, with a simple structure,
It is also effective for further downsizing of the copying machine itself, improvement of image quality such as image uniformity, expansion of functions, energy saving, and cost reduction.

[Brief description of drawings]

FIG. 1 relates to an image reading apparatus of a first embodiment according to the first invention, (a) is a schematic configuration diagram of the apparatus, and (b) and (c) are graphs relating to the operation of the apparatus.

FIG. 2 is a schematic configuration diagram of a main part of an image reading apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic perspective view of a main part of a lighting device according to a third embodiment of the second invention.

FIG. 4 is a schematic configuration diagram of a main part of a lighting device according to fourth to eleventh embodiments of the present invention.

FIG. 5 is a schematic configuration diagram of a lighting device according to a second conventional example.

FIG. 6 is a perspective view of a main part of an illumination device according to the conventional example.

FIG. 7 is a perspective view of a main part of another illumination device according to the conventional example.

FIG. 8 is a perspective view of essential parts of a lighting device according to a twelfth embodiment of the third invention.

FIG. 9 is a schematic perspective view of a main part of a lighting device according to a thirteenth embodiment of the present invention.

FIG. 10 is a schematic configuration diagram of a main part of a lighting device according to a fourteenth embodiment of the present invention.

FIG. 11A is a schematic configuration diagram of a main part of a lighting device of a fifteenth embodiment of the present invention, and FIG. 11B is a schematic perspective view of a main part of a lighting device of a sixteenth embodiment of the present invention.

FIG. 12 is a diagram showing a method of manufacturing the light blocking member of the lighting device according to the present invention.

FIG. 13 is a schematic configuration diagram of a lighting device according to a third conventional example.

FIG. 14 is a schematic configuration diagram of an illumination device according to another example of the conventional example.

FIG. 15 is a perspective view of a main part of a lighting device according to the conventional example.

FIG. 16 is a main part configuration diagram of an illumination device according to the conventional example.

[Explanation of symbols]

Reference numeral 101 original document 103 color reading light source 104 ultraviolet light source (invisible light source) 107 CCD (imaging means) 108 ultraviolet cut filter (invisible light removing means) 202, 203, 204 main mirror (main reflecting means) 227, 228, 229 side mirror ( Side reflection means) 225, 226 Support members 225a, 226a Holes (fitting holes) e, f Fitting projections 306 Lens (optical system) 309 Light-shielding member 313 Ridge line 315 Winding device (winding means) 314a, b Reinforcing material (Rigid member)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location G03G 15/04 120 9122-2H 21/00 H04N 1/04 D 7251-5C (72) Inventor Takemura Yukio 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (15)

[Claims] 1. A color reading light source for illuminating a document on which invisible information is formed in addition to a color image so as to obtain color image information from the document, and the document for illuminating the document for converting the invisible information of the document into visible information. An invisible light source, and an image reading unit that reads reflected light from the document by the invisible light source and the color reading light source, wherein invisible light from the invisible light source is detected by the image pickup unit. The image reading device is characterized in that invisible light removing means is provided between the invisible light source and the image pickup means so as not to operate. 2. A reflection means for condensing light from a rod-shaped light source on a document surface, said reflection means being a main reflection means parallel to the longitudinal direction of said rod-shaped light source and both longitudinal edges of said main reflection means. A side reflecting means supported laterally via a reflecting means supporting portion, and the reflecting means supporting portion is a supporting member which is a member different from the side reflecting means. A fitting hole formed in an ineffective reflection portion formed of a reflection area other than the effective reflection area of the reflection means, and projecting at both side edges of the main reflection means, which are movably fitted in the fitting hole. An illuminating device, comprising: 3. The lighting device according to claim 2, wherein the side reflection means is attached to or integrally formed with the support member. 4. The lighting device according to claim 3, wherein the reflecting surface of the side reflecting means is perpendicular to the opposite surface of the main reflecting means. 5. The illuminating device according to claim 3, wherein the reflecting surface of the side reflecting means is a plane which is not perpendicular to the reflecting surface of the main reflecting means. 6. The illuminating device according to claim 3, wherein the reflecting surface of the side reflecting means is composed of a plurality of two or more surfaces or is a curved surface. 7. The lighting device according to claim 3, wherein the support member is movable with respect to the main reflection means. 8. An image reading apparatus comprising: an optical system for guiding reflected light from a document; and a light blocking member having a light blocking line for preventing irregular reflection of the reflected light inside the apparatus. An image reading apparatus characterized in that a ridge line is formed obliquely with respect to a tangent line of a concentric circle having an optical axis of the optical system as a center. 9. The angle formed by the direction of the ridgeline of the light-shielding line of the light-shielding portion and the direction of the tangent of a concentric circle centered on the optical axis of the optical system is:
The image reading device according to claim 8, wherein the image reading device has a range of approximately 20 degrees to 70 degrees. 10. The angle formed by the direction of the ridgeline of the light-shielding line of the light-shielding portion and the direction of the tangent of a concentric circle centered on the optical axis of the optical system is in the range of approximately 30 to 60 degrees. Image forming apparatus. 11. The image reading apparatus according to claim 8, wherein a part or the whole of the light shielding member is reinforced with a rigid member. 12. The image reading apparatus according to claim 8, wherein tension is applied to an end portion of the light shielding member. 13. The image reading apparatus according to claim 8, wherein a winding means is provided at an end of the light shielding member so that the length of the light shielding line of the light shielding member can be changed in response to a change in the positional relationship of the optical system. . 14. The image forming apparatus according to claim 8, wherein the light-shielding line of the light-shielding member is formed by bonding and connecting the parallel side portions of the sheet-shaped side edge member. 15. The image forming apparatus according to claim 8, wherein two or more kinds of angles formed by a tangential direction of a concentric circle having the optical axis of the optical system as a center and a ridge direction are combined.