JPH063751A - Original illuminator, lamp and copying device - Google Patents

Abstract

PURPOSE:To attain a changeover to a different light source when a light source becomes an unlighted one. CONSTITUTION:An original illuminating halogen lamp (original illuminating light source) 106 has at least, two halogen lamps 106A and 106B and is provided with a current sensor (means for detecting lighting) 110 detecting the fact that out of the halogen lamps (light sources) 106A and 106B, the lighted lamp is burnt out, and a changeover switch (light source switching means) 107 executing the changeover from the burnt out halogen lamp to the other halogen lamp, based on the result of the detection of the current sensor 110, as a characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The first invention relates to a document illuminating device such as a copying device for scanning a document.

A second aspect of the present invention relates to a lamp used as a light source for illuminating a document or film in a document reading section such as a copying machine, an image reader or a projector.

A third aspect of the present invention relates to the structure of a reading optical system of a copying machine which simultaneously has a digital color output device represented by an ink jet or the like as a second full color output means in addition to the conventional electrophotographic copying device. .

[0004]

[Prior art]

(First Conventional Example) Conventionally, as an original scanning system for a copying machine or the like, it is possible to downsize the apparatus as shown in FIG.
An illumination system and a reflection mirror 1105 having a configuration as shown in FIG.
A scanning system such as 1105 'has been widely adopted.

As an original illuminating device, as shown in FIG. 3B, a reflector 1 is provided around a long halogen lamp 1106.
103, 1103 ′ are provided to increase the light converging property to illuminate the original 1101 on the original table glass 1102, and the slit 110
4, the lens 1110, the mirror 1111 and the photoconductor 1
It has been conventionally known that the reflected light is guided to 112. (Second Conventional Example) FIG. 6A is a schematic view of a document reading portion of a general image reader. In the figure, 120
Reference numeral 0 denotes a reflection shade, and the reflection shade 1200 irradiates the original 1203 placed on the transparent original stacking glass 1202 with the luminous flux emitted from the halogen lamp 1201 as a lamp. Then, the reflection shade 120 is illuminated while illuminating the original 1203.
0, a halogen lamp 1201 and the like are scanned in parallel with the direction of arrow A, and the reflected light D is scanned by the scanning mirrors 1204 to 120.
6. Orient and read the solid-state image sensor 1208 such as CCD through the imaging lens 1207.

When the document 1203 is scanned up to the end point B and the reading is completed, the reflection shade 1200 and the halogen lamp 120
The 1st, etc. returns to the fixed position C and waits for the next operation. When the original is read again, the original 1203 is scanned again in the direction of arrow A and this is repeated.

FIG. 6B shows the halogen lamp 1201.
Indicates. In this halogen lamp 1201, a plurality of filaments 1209, which are light emitting parts, are housed inside a quartz glass tube 1210, and the filaments 1209 are anchored to the anchor part 121.
Electrodes 1211 for supplying electric current to the filament 1209 group were provided at both ends of the quartz glass tube 1210.

It is well known that the filament 1209 is warmed by the heat generated by the filament itself and promotes the halogen cycle to enhance the luminous efficiency, so that it is formed in a coil shape as shown in (C). . Here, when the thickness of the filament 1209 is set to about 0.1 mm, the coil pitch “P” is usually about 0.15 to 0.25 mm based on experience from halogen cycles, and this value is the axial direction of the filament 1209. From the end portion E to the central portion F are substantially the same.

By the way, as described above, the halogen lamp 1
When the image reading scanning of the original 1203 is performed by moving 201, the halogen lamp 1201 vibrates in the radial direction by this reciprocating operation (particularly due to inertia at the time of turning back at the position B and at the time of stopping at the fixed position C). The vibration is also transmitted to the filament 1209. (Third Conventional Example) FIG. 10 shows the arrangement of an optical system in a conventional analog electrophotographic apparatus. The manuscript placed on the manuscript table glass 1301 has a rod-shaped light source 1302 and an elliptic mirror 1303.
Therefore, it is illuminated. The illuminated originals are 1317, 13
After being reflected by the reflecting mirrors 05 and 1306, an image is formed on a photosensitive drum (not shown) by the image forming lens 1310. At this time, similarly, the reflection mirrors 1307 and 13
The luminous flux is reflected by 08 and 1309. The image of the document formed on the photosensitive drum is developed, transferred, and fixed by an electrophotographic process (not shown), and then copied as an image of the document.

On the other hand, as shown in FIG. 11, in the digital reading optical system, the original image illuminated by the illumination system is also solid-state image sensor (CCD) by the imaging lens 1318.
Etc.) imaged on 1319. The solid-state image sensor 1319 is available in black and white and in color. In the case of color, the R.S. G. B. The information of the original image, which is color-separated by the filter of, is obtained. This image signal can be reproduced in full color by reproducing an image of a document by an inkjet type color output device (not shown) or a color electrophotographic process.

As described above, the reading device of the copying machine includes
There are roughly two types of systems, analog systems and digital systems, both of which have advantages and disadvantages. The analog system can be manufactured at low cost and the running ghost of copying is low. However, the analog color electrophotographic process is not suitable as a full-color copying apparatus because the image reproducibility is deteriorated due to the influence of process characteristics during copying. On the other hand, a copying machine using a digital reading system has a large merit in terms of image quality, but both the apparatus cost and running cost in the case of a full-color electrophotographic process are higher than those of a black-and-white analog copying machine. , Has disadvantages. Under such circumstances, it is necessary to output black-and-white copies at low cost and at high speed, and even if color copying is somewhat slow, there is a high demand for high-quality images and the main unit cost is low. ing.

[0012]

[Problems to be Solved by the Invention]

(First Problem) However, in the first conventional example, the halogen lamp 1106 also scans the document together with the reflection mirror system, so vibration during scanning and shock at the time of starting, stopping, and reversing are applied to the halogen lamp 1106. The life of the halogen lamp 1106 is deteriorated and the halogen lamp 1106 is easily burnt.

When the halogen lamp 1106 is burnt out, the copying machine must be stopped, which is a major factor in determining the maintenance interval of service personnel in the market. (Second Problem) Further, in the halogen lamp 1201, since the coil pitch P of the entire filament 1209 is the same, the center of gravity of the halogen lamp 1201 is substantially the center portion F of the filament 1209.
Therefore, the amplitude during the above vibration is large. As a result, the D portions and the like may come into contact with each other and the filament coil may be short-circuited, and the current flowing through the filament 1209 increases.
Finally, there was the problem of melting. (Third Problem) As described above, both the analog system and the digital system have advantages and disadvantages. However, in order to use these advantages integrally, a monochrome original is copied using the analog system. , It is thought that we can find sufficient merits in the method of copying a full-color original with a digital system, but since the method of the reading optical system is greatly different between the analog system and the digital system, the reading system can be used for one main unit. Since it has two types, it was not possible to realize a compact reading system. (First Object) A first invention is made to solve the first problem, and an object thereof is to provide an original illuminating device which can be switched to another light source when the light source is turned off. To do. (Second object) A second invention is to solve the above-mentioned second problem, and an object thereof is to provide a lamp capable of reducing the amplitude of the central portion in the axial direction of the filament. (Third object) A third invention is made to solve the above-mentioned third problem, and an object of the third invention is to provide a copying apparatus provided with two kinds of reading systems of analog type and digital type at the same time. To provide compact and low cost.

[0014]

[Means for Solving the Problems]

(1st invention) In order to achieve the above 1st object, in 1st invention, in the manuscript lighting device which possesses the manuscript lighting light source, the manuscript lighting light source has at least two light sources, Of the at least two light sources from the unlighted light source based on the detection result of the lighting detection unit and the lighting detection unit that detects that the light source that has been turned on of at least two light sources has stopped lighting Light source switching means for switching to another light source. (Second invention) In order to achieve the above-mentioned second object, a second invention is a lamp having a filament wound in a coil shape, wherein the pitch of the central portion of the filament in the axial direction is set to the axial direction of the filament. The feature is that the pitch is set larger than the end pitch.

Further, a plurality of filaments were connected in series via a non-luminous member, and the filaments were provided in a quartz glass tube. (Third invention) In order to achieve the above-mentioned third object, in the third invention, in a copying machine provided with an analog system and a digital system, the analog system optical path and the digital system optical path are provided. It is characterized in that it has a movable mirror capable of switching between, and the movable mirror switches the image light from the document between an optical path to a photoconductor capable of forming an image and an optical path to a solid-state image sensor capable of photoelectric conversion.

[0016]

[Action]

(Operation of the First Invention) According to the present invention, at least two light sources are provided in advance in the document illuminating device, and when the light source used is no longer lit, a change in current flowing through the light source is prevented. By detecting by the lighting detection means, the light source to be turned on is automatically switched to another light source by the light source switching means, so that it is possible to prevent the copying apparatus provided with the document illumination device from stopping in the market. (Operation of the Second Invention) According to the present invention based on the above-mentioned configuration, since the center portion in the axial direction, which is the center of gravity of the filament, is lighter than the end portions, the amplitude during vibration is small and it is difficult to contact. (Operation of Third Invention) In the present invention having the above-described configuration, the analog optical path and the digital optical path are switched by changing the direction of the movable mirror.

[0017]

【Example】

[Embodiment of the First Invention] (First Embodiment) FIG. 1 is a drawing which best shows the features of this embodiment of the present invention. Two original illumination halogen lamps 106 are used as an original illumination light source. Halogen lamps 106A and 106B as light sources are provided in the lighting device. First of all, the halogen lamp 1 is used as the document illumination light source.
06A is turned on to scan the original. Then, the current flowing in the halogen lamp 106A is monitored, and when the halogen lamp 106A is turned off and the lamp is no longer turned on, the current does not flow. Therefore, it is detected that no current is flowing. When detected by the current sensor 110 as a means, the changeover switch 107 as a light source switching means is changed to enter a mode in which the halogen lamp 106B as another light source is turned on. As a result, even if the halogen lamp 106A is turned off, the halogen lamp 106B is turned on, so that the main body of the copying apparatus can be prevented from stopping.

Reference numeral 108 denotes a document illumination halogen lamp 1.
A power source for lighting 06, 101 is a document, 1
Reference numeral 02 is a platen glass, 103 and 103 'are reflection shades, 10
4 is a slit and 105 is a mirror.

Another embodiment of the present invention will be described below. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. (Second Embodiment) FIG. 2 (a) shows a second embodiment according to the first invention, in which halogen lamps 106A and 106B are provided on the opposite side with the optical axis interposed therebetween.
When the halogen lamp 106B is turned on for the 6A main reflection shade 103 and the auxiliary reflection shade 103 ', the shade 103' is set to 1
By using the main reflection shade of 06B and the shade of 103 as an auxiliary reflection shade, the halogen lamps 106A, 1
The entire illumination system can be made more compact than when the 06B is provided. (Third Embodiment) As shown in FIG. 2B, the halogen lamps 106A and 106B are fixed to the rotating body 109 and the rotating body 1
A halogen lamp that is turned on when the 09 is rotated can be arranged at a predetermined position. By doing so, the halogen lamp that does not light up can be removed from the illumination system, and the halogen lamp that does not light up can be prevented from reducing the illumination efficiency.

Further, as described above, in the structure in which the halogen lamp is fixed to the rotating body 109, it is possible to easily provide three or more halogen lamps. [Embodiment of the Second Invention] (Fourth Embodiment) Next, the present invention will be described with reference to an embodiment in which an original reading unit of an image reader is used. FIG. 4A is a schematic front sectional view of a document reading portion of a general image reader. In the figure, reference numeral 202 denotes the original placing glass 20.
3 is a reflection shade provided below the reflection shade 202, and the reflection shade 202 irradiates a light flux emitted from a halogen lamp 201 as a lamp onto a document 204 placed on a transparent document stacking glass 203. Then, the halogen lamp 201 illuminates the original 204, and the halogen lamp 201, the reflective shade 202, and the like are scanned below the original surface in parallel with the direction of arrow G. Then, the reflected light H is directed through the scanning mirrors 205, 206, 207 and the imaging lens 208 to the solid-state image sensor 209 such as CCD, and is read.

After scanning to the point J at the edge of the original 204 and reading through it, the halogen lamp 201, the reflection shade 202, etc. return to the fixed position K and wait for the next operation. When the original 204 is read again, the original 204 is scanned again in the direction of arrow G and this is repeated.

FIG. 3B is a side view of the halogen lamp 201. The halogen lamp 201 is provided with electrodes 214 at both ends of the quartz glass tube 13, and the quartz glass tube 213 is filled with a halogen gas, a halogen compound or the like.

A plurality of filaments 211 are arranged in the quartz glass tube 213 along the axial direction. The filament 211 is made of a material such as tungsten. This filament 211 group is connected by a non-light emitting member 212, and the non-light emitting member 212 is held in contact with the inner peripheral surface of the quartz glass tube 213. The filaments 211 located at both ends in the axial direction are connected to the electrodes 214, respectively. In such a configuration, a current is passed from the electrode 214 to the filament 211, and the filament 211 emits incandescent light.

(C) is an enlarged side view of the filament 211. The filament 211 is wound in a coil shape, and its axial direction, that is, the pitch PC of the central portion H in the horizontal direction in the drawing is set to be larger than the pitch P1 of the end portion T. That is, PC = P1 × 2. By doing so, the central portion H, which is the center of gravity of the filament 211, becomes lightweight. Then, when the halogen lamp 201 is moved to read the original 204, even if radial vibration is applied to the halogen lamp 201, the amplitude of the central portion H is small and the coil portions do not contact each other. Therefore, it is possible to prevent the filament 211 from being melted and the life is extended. (Fifth Embodiment) FIG. 5A shows a filament 211 according to the fifth embodiment. The axial length L is the same as that of the conventional one, the pitch PT of the end portion T is smaller than the conventional pitch, and the pitch P of the slightly central portion M is substantially the same as the conventional one.
The pitch PC of the central portion H is set to be larger than the pitches PT and P and is larger than the conventional pitch. With this filament 211, the same effect as that of the fourth embodiment can be obtained.

Further, in the fifth embodiment, the filament 2
Since the coil pitch PT at the end of 11 is made small, the luminous efficiency at the end of the filament 211 is improved and the luminous dimension of the filament 211 is increased. Therefore, when applied to a lamp for the purpose of uniformly illuminating a wide range, it is effective in preventing unevenness of the light amount on the irradiation surface. (Sixth Embodiment) FIG. 5B shows a sixth embodiment. In this embodiment, the filament 21 is placed inside the quartz glass tube 213.
Only one is provided. The filament 211 is the fourth
It is constructed similarly to the fifth embodiment. Also in the sixth embodiment, the same effect as in the fourth embodiment can be obtained. (Seventh Embodiment) FIG. 5C shows the seventh embodiment. In the quartz glass tube 215, one filament 211 is provided along the radial direction. An electrode 216 is provided below the quartz glass tube 215. Both ends of the filament 211 are connected to the electrodes 216. The filament 211 is the fourth
Alternatively, the structure is similar to that of the fifth embodiment. Therefore, the same effect as that of the fourth embodiment can be obtained.

The present invention can also be applied to an optical system of a copying machine, a projector and the like. [Embodiment according to the third invention] (Eighth embodiment) Fig. 7 shows an eighth embodiment according to the third invention, in which the original on the original platen glass 301 is similarly rod-shaped as an original illuminating device. Illuminated by a light source 302 and an elliptical mirror 303. When analog copying is performed on the illuminated original, the reflection mirrors 304, 305, 30 are used as in the conventional example.
After being reflected by 6, the reflecting mirror 3 is formed on the photosensitive drum 17 as a photosensitive member capable of forming an image by the imaging lens 310.
Images are formed via 07, 308, and 309. Here, the reflection mirrors 305, 306, 308, 309 and the imaging lens 3
Reference numeral 10 constitutes an analog system A. Further, when reading is performed by a digital system, the movable mirror 304 is fixed by rotating 90 ° in the direction a and then rotated by 180 °, and the image forming lens 312 for the digital optical system is used by the imaging lens 312 for the digital optical system. ) Imaged on 313. Here, the image forming lens 312 and the CCD 313 form a digital system D. A reduction type is generally used as the imaging lens 312 of the digital optical system D, and the rod-shaped light sources 302 and 303, the movable mirror 304, the imaging lens 312, and the CCD 313 are used.
Reads the image while moving in the A'direction as an integrated unit. The movable mirror 304 can be easily configured to perform 90 ° positioning by a solenoid, a rotary positioning pin, etc., which are not shown.

With such a system, the reading optical systems for both analog and digital systems are simultaneously constructed, and the rod-shaped light sources 302 and 303 as the document illuminating device are used in common, so that the device can be made compact and the cost can be reduced. Can be achieved at the same time. (Ninth Embodiment) FIG. 8 shows a ninth embodiment, in which the reflecting mirrors 311, 305, 306, 307, 308, 309 and the imaging lens 310 constitute an analog system A, and the reflecting mirror 3
15, image forming lens 312, CCD 313 is a digital system D
Make up. The movable mirror 314 is arranged immediately in front of the analog imaging lens 310, and in the case of analog reading, the movable mirror 314 is parallel to the original platen glass 1 and the imaging light flux that has passed through the reflection mirrors 311, 305, 306. Is placed in a non-interrupting state, and when reading a digital system, it rotates 45 ° in the b direction, and the light flux is folded back downward. The light flux reflected by the reflecting mirror 315 is formed by the imaging lens 312.
An image is formed on the solid-state image sensor 313 by. The movable part in this case is only the rod-shaped light source as the document illuminating device and the reflecting mirrors 311, 305 and 306 as in the conventional example (tenth embodiment). FIG. 9 shows the tenth embodiment. 305, 306, 307, 308, 309 and the imaging lens 310 form an analog system A, and the imaging lens 31
2, the CCD 313 constitutes a digital system D. The movable mirror 316 is arranged in a 45 ° direction with the original table glass 301 at the time of analog reading, and is arranged so as to reflect an analog image-forming light beam in a 90 ° direction. At the time of reading the digital system, the system rotates in the direction C perpendicular to the platen glass 301 and retracts so as not to interrupt the light flux of the digital system. The imaging lens 312 and the solid-state image sensor 313 are arranged below the movable mirror and read the information of the document. Even with such a measure, the same effect as that of the eighth embodiment can be expected.

[0028]

【The invention's effect】

(Effect of the first invention) As described above, in the first invention, the illumination system is provided with a plurality of light sources from the beginning, and the light source that has been turned on is no longer turned on. By turning on the other light source in response to the detection by the detection means, it is possible to prevent the copying apparatus from being stopped due to the light source not being turned on.

Further, it becomes possible to make the period of light source replacement in the market very long. (Effect of the second invention) Since the second invention is configured as described above, the central portion of the filament becomes lighter,
When vibrating, the amplitude of the central portion is reduced, so that it is difficult to contact the adjacent coil. Therefore, the fusing of the filament is reduced, and the life is extended, which can be extended. (Effect of the third invention) As described above, in the third invention, since the analog optical path and the digital optical path are switched by the movable mirror, the apparatus can be made compact and the cost can be reduced. It was possible to achieve at the same time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a document illumination device of a first embodiment according to the first invention.

FIG. 2A is a schematic configuration diagram of a main part of a document illuminating device according to a second embodiment of the invention, and FIG. 2B is a schematic configuration of a main part of a document illuminating device according to the third embodiment of the invention. It is a figure.

FIG. 3 is a schematic configuration diagram of a conventional document illumination device.

4A is a front sectional view of an image reading portion of an image reader applied to the second invention, FIG. 4B is a side view of a halogen lamp of FIG. 4A, and FIG. 4C is of a fourth embodiment. The enlarged side view of a filament.

5A is an enlarged side view of a filament of a fifth embodiment, FIG. 5B is a side view of a halogen lamp of a sixth embodiment, and FIG. 5C is a side view of a halogen lamp of a seventh embodiment. Fig.

6A is a front sectional view of an image reading portion of an image reader according to a second conventional example, FIG. 6B is a side view of a halogen lamp of FIG. 6A, and FIG. 6C is a filament view of FIG. Enlarged side view.

FIG. 7 is a schematic configuration diagram of a copying apparatus of an eighth embodiment according to the third invention.

FIG. 8 is a schematic configuration diagram of a copying apparatus according to a ninth embodiment of the present invention.

FIG. 9 is a schematic configuration diagram of a copying apparatus according to a tenth embodiment of the present invention.

FIG. 10 is a schematic configuration diagram of a copying apparatus according to a third conventional example.

FIG. 11 is a schematic configuration diagram of a copying apparatus according to a third conventional example.

[Explanation of symbols]

 106 Original Illumination Halogen Lamp (Original Illumination Light Source) 106A, 106B Halogen Lamp (Light Source) 110 Current Sensor (Lighting Detection Means) 107 Changeover Switch (Light Source Switching Means) 201 Halogen Lamp 211 Filament 213 Quartz Glass Tube T Filament Coil End H Central part of filament coil 304, 314, 316 Movable mirror A Analog system D Digital system

Claims (4)

[Claims] 1. A document illuminating device provided with a document illuminating light source, wherein the document illuminating light source has at least two light sources, and it is detected that one of the at least two light sources that has been turned on is no longer turned on. An original document, comprising: a lighting detection unit that is turned on, and a light source switching unit that switches from the light source that is no longer turned on to another light source of the at least two light sources based on a detection result of the lighting detection unit. Lighting equipment. 2. A lamp having a filament wound in a coil shape, wherein a pitch of a central portion in the axial direction of the filament is set to be larger than a pitch of axial end portions of the filament. 3. The lamp according to claim 2, wherein a plurality of filaments are connected in series via a non-luminous member, and the filaments are provided in a quartz glass tube. 4. A copying apparatus having an analog system and a digital system, having a movable mirror capable of switching between the analog optical path and the digital optical path, and image light from a document is transferred by the movable mirror. A copying apparatus characterized by switching between an optical path to a photoconductor capable of forming an image and an optical path to a solid-state image sensor capable of photoelectric conversion.