JP3161875B2 - Document reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus for reading a document image by a reading element and converting the image into a digital video signal or the like.

In particular, the present invention relates to a structure for preventing deterioration of image reading ability due to dust in a device for reading a transparent original such as a film.

[0003]

2. Description of the Related Art In a device for performing image processing by converting image information of a document, especially a transparent document into an electric signal, a document holding unit for holding the document, an image forming lens for forming an image of the document on a reading element, It comprises a reading element for reading image information and a document illuminating section for illuminating the document.

In such an apparatus, in order to make the entire apparatus compact, the optical path of the original, the imaging lens, and the reading element is bent by a mirror and arranged, and the reading element has a spectrum that is harmful to image reading. It is common practice to place an infrared cut filter or the like in the optical path so that light does not reach.

However, when the reflection mirror and the optical filter are arranged in the optical path as described above, if the reflection mirror and the optical filter are used for a long time, dust and dirt adhere to the reflection mirror and the optical filter and reach the element for reading an image. If the amount of light is reduced to deteriorate the contrast at the time of reading, the light is scattered to deteriorate the quality of the read image, and if a three-line CCD or the like is used as in a color image reading device, dust or dirt is generated. Since the image itself forms separate images on the reading lines of each color, there has been a problem that the image appears as color unevenness.

[0006] This phenomenon is not so problematic in the case of dust or dirt near the imaging lens because the image of dust or dirt does not reach the element as a sharp image, but on the contrary, it is close to the original or close to the reading element. The placed mirrors and filters sharpen the image of dust and dirt, so the conditions for adhesion of dust and dirt are more severe, and the above-mentioned phenomenon has been remarkably exhibited.

In particular, when a CCD is used as a reading element, it is generally necessary to dispose an infrared cut filter immediately before the CCD, so that contamination of the filter has been a particular problem.

[0008] Considering the situation at this time, dust and dust in a space sealed to some extent fall from above to below by the action of gravity in an environment where static electricity or the like is not generated.

Therefore, in order to prevent dust and dirt from adhering to the mirror and the optical filter, it is only necessary to turn the surface of the mirror and the optical filter to face downward. Was.

However, conventionally, as shown in FIG. 23, there are mirrors and filters facing downward, and there are mirrors and filters pointing upward. A mirror facing downward is good, but a filter inclined upward from a vertical plane and a mirror facing upward are immediately available. Dust adhered to the image, causing image deterioration.

In order to prevent this, conventionally, the read element having more severe conditions and the filter immediately before the read element are turned downward.
The effect was reduced by turning the mirrors and filters near the remaining lenses upward.

[0012]

However, in the above-described conventional example, dust and dirt eventually adhere to the mirror or filter facing upward, and although the degree of influence on the image is small, it cannot be ignored immediately. There was a drawback that it became dirty.

Therefore, in practice, the mirror and the filter near the lens are mechanically structured so that they can be easily cleaned, and the performance is maintained by frequent maintenance.

However, in practice, the optical imaging system is often covered as a complete box structure in order to eliminate the influence of external light, and it is often difficult to clean the mirrors and filters.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to reduce the amount of dust and dirt adhering to a mirror and a filter in a document reading apparatus. Reduces troublesome cleaning maintenance work to maintain image quality, maintains good images over a long period of time, and prevents dust and dust from adhering to the filter immediately before the reading element, which strongly affects image deterioration, It is an object of the present invention to provide a structure that also reduces the adhesion of dust and dust to other mirrors and filters.

[0016]

In order to achieve the above object, a document reading apparatus according to the present invention comprises an illumination system for illuminating a document, a holding device for holding a document, a reading element, and a reading element. A lens that forms an image on a reading surface, a filter provided between the reading element and the lens,
Wherein the lens side surface of the filter is inclined downward from the vertical, and the filter and the reading element are connected by a cover member so as to cover at least the upper part of the filter.

Further, it is preferable that the reading element is lifted by an amount corresponding to the displacement of the optical axis due to the filter and the center of the element is aligned with the center of the optical axis.

The filter is an infrared cut filter that cuts light in an infrared region of the light spectrum from the illumination system.

Further, the filter may also serve as a dustproof filter.

On the other hand, except for the filter, the mirror between the original and the reading element, the filter and the reading element may all be mounted in a vertical plane.

[0021]

In the original reading apparatus constructed as described above,
Since the lens side surfaces of the plurality of filters are inclined downward from the vertical, and the filter and the reading element are connected to cover at least the upper portion of the filter with a cover member, dust and dirt do not adhere to the mirror or the filter.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

First, the overall unit arrangement of the embodiment will be described with reference to FIG.

FIG. 1 is an oblique view of a transparent original reading apparatus, wherein 1 is an illumination unit for illuminating a transparent original,
2 is a magazine detachably fixed to the optical unit 4,
Reference numeral 3 denotes a carrier which is detachably fixed to the magazine with the transparent document held down. 4 denotes an optical unit which detachably fixes the magazine 2 and includes a lens and a CCD for forming an image on the CCD. 5 denotes a conductive material. And completely covers the CCD and the CCD sub-scanning drive unit. This prevents radiated electromagnetic noise from the CCD part.

Reference numeral 6 denotes an electrical box for housing electrical components, which is made of a conductive material. In the examples, "trade name: Ulster steel plate" is used as the conductive material, and the conductivity is further improved.

Further, in this embodiment, the box structure is painted as it is to form a part of the exterior, so that the cover of this part is abolished and the cost is reduced.

In addition, if a conductor such as a metal cover is separately attached to this portion, it may become an antenna for electromagnetic noise if it is electrically floating, but in this embodiment, no extra cover is provided. This suppresses the generation of electromagnetic noise.

Reference numeral 7 denotes an electric base which constitutes the bottom of the electric box. The electric base is made of a conductive material like the electric box 6.
And is configured to be able to be pulled out in the direction of arrow 14 on the rear side of the apparatus. The electric board 12 and the power supply 13 are fixed thereon, and are pulled out together to facilitate maintenance work.

Reference numeral 8 denotes an optical viewer for an operator to confirm which image is currently being projected. In this configuration, a switching mirror is provided in the image forming optical path, and is normally kept in a monitor state, and when the image is read by the CCD, the mirror is switched to form an image on the CCD.

9 is a cooling fan for releasing the heat of the lighting unit, 10 is a filter switching motor for switching the filter for switching the spectrum of the illumination light between the negative film and the body film, and 11 is a leg for supporting the entire apparatus. .

Next, the mechanical arrangement of the embodiment will be described with reference to FIG. 2 along the direction from the halogen illumination lamp 28 side of the optical axis to the CCD side.

FIG. 2 is a top view of the transparent original reading apparatus according to the embodiment. First, the lighting unit 1 will be described.

Reference numeral 28 denotes a halogen illumination lamp, which can change the amount of light depending on the density and type of the film.
27 is a substantially hemispherical reflecting mirror, and 29 is a condenser lens for collecting light.

Reference numeral 30 denotes a halogen illumination lamp 28 for raising the temperature of the transparent original and preventing the original from being damaged.
Is a heat-insulating glass for reducing the infrared region of the light. This is square instead of round for cost reduction. This is because, since the document is a square, the heat-insulating glass can also be made a square, and if the material is taken into consideration, a non-circular shape can be made cheaper as in the related art.

Reference numeral 31 denotes a field lens which performs Koehler illumination together with a condenser lens.

A cyan filter 26 is used to cancel the color of the base film when a negative film is used as a document. Reference numeral 32 denotes an ND filter, which is used for the purpose of reducing the amount of light because the film itself has good transparency and the amount of light is excessive because the cyan filter 26 is not used when a positive film is used as a transmission original. These two filters are exclusively driven by a filter switching motor 10. Reference numeral 24 denotes a filter position detecting photosensor for stopping the switched filter position at a predetermined position.

Reference numeral 20 denotes a diffusion plate disposed between the transmissive original and the illumination system for reducing the roughness of the film particles.

As described above, reference numeral 9 denotes a cooling fan for releasing the heat of the original film, the lens, and the heat-insulating glass 30 heated by the energy (heat) of the infrared region component from the illumination lamp 28. Air is drawn in from the electrical component box 6 through the hole formed in the box, and is discharged outside through the lens portion. Reference numeral 25 denotes a hot air guide for guiding the flow of air to the outside so that the warmed air does not heat the CCD sub-scanning drive unit and the like.

Reference numeral 33 denotes a cover for an electric connector (not shown) of the magazine 2 and the main body. This is a connector shutter to prevent foreign objects such as clips from entering the female side of the connector when the magazine is removed, and to prevent an accident such as a short circuit. When the magazine 2 is mounted, the connector shutter opens automatically. I have.

Next, the optical unit 4 will be described. 3
Reference numeral 4 denotes a magazine release link for releasing a link mechanism for holding the magazine 2 to be described later on the optical unit 4, which is fixed to a magazine release shaft 35 and is manually operated by a magazine release handle 38.

Reference numeral 37 denotes a mirror, which functions to guide the light transmitted from the illumination unit 1 through the transparent original to the image forming lens 39 with its optical axis aligned. Reference numeral 36 denotes a mirror adjustment link for adjusting the optical axis.

Reference numeral 39 denotes an image forming lens for forming an image of the original 19 on the CCD 48. Reference numeral 40 denotes a lens driving cam for driving the imaging lens 39 in the direction of arrow 18 for automatic focusing (hereinafter referred to as “AF” or “autofocus”). The cam fits into the groove of the lens barrel of the imaging lens 39 and is driven by a lens drive motor 41. As a result, the AF driving mechanism has been simplified and the cost has been reduced.

Further, the cam is a one-turn cam so as to return to the original position by one rotation, and a home position sensor (not shown) is provided at a predetermined position.

The lens drive motor 41 uses a stepping motor, and the rotation angle from the home position is accurately determined.
Is controlled so that the lens is moved to the appropriate position for AF at the second rotation and fixed.

Reference numeral 44 denotes an optical path switching mirror for selecting whether to form an image on the CCD or the optical viewer 8. Reference numeral 42 denotes an optical path switching solenoid for moving the optical path switching mirror, and reference numeral 43 denotes a lever for transmitting driving.

48 is a CCD, 55 is a CCD 48
For moving the CCD in the sub-scanning direction, 46
And 54 are bearings that roll on the rails. Reference numeral 53 denotes a CCD scanning base for moving the CCD 48 in the sub-scanning direction, and reference numeral 51 denotes an infrared cut filter provided immediately before the CCD.

This is inclined downward as shown in FIG. 6 in order to prevent adhesion of dust and dirt. 52 attaches the infrared cut filter 51 to the CCD scanning base 53,
Further, it is a CCD cover for protecting the CCD 48 itself from dust and dust.

A home position sensor 49 determines the home position position of the CCD scanning base 53 by detecting the home position edge 23 of the CCD scanning base 53. Reference numeral 50 denotes a limit sensor which detects the limit edge 22 of the CCD scanning base 53 and indicates that the CCD scanning base 53 is located at a predetermined distance from the movement limit when the CCD scanning base 53 moves upward in FIG. This is notified to a motor control microprocessor of the CCD sub-scanning drive motor 61 described later. Thereby, the timing of deceleration of the sub-scan is created.

Reference numeral 56 denotes a pre-home position sensor, which is about 5 mm in front of the home position when the CCD scanning base 53 moves downward in FIG.
3 is configured to detect the pre-home position edge 21. This is because the CCD scanning base 53 returning to the home position at high speed cannot be stopped immediately, so that the deceleration must be started before the home position sensor. Thereby, it is possible to optimally start deceleration near the home position sensor.

Conventionally, the number of pulses from the home position has been stored and the motor has been controlled in accordance with the number of pulses. However, the pre-home position sensor caused a step-out or malfunction in the middle and the number of pulses could not be determined. Even in such a case, it is possible to maintain a high return speed. In the past, if you returned at high speed, it often stopped when it detected the home position.

Reference numeral 47 denotes a CCD driver board from which image signals are sent out as analog signals.

Next, the CCD sub-scanning drive unit will be described. Reference numeral 57 denotes a CCD sub-scanning drive belt stretched between the CCD sub-scanning drive pulley 59 and the idler pulley 45. The idler pulley 45 is pulled with a predetermined force by a spring (not shown) in the upper part of FIG. 2, and applies a predetermined tension to the CCD sub-scanning drive belt 57.

The CCD sub-scanning drive belt 57 is a CCD
The scanning base 53 is connected at one point near the rail.
A speed reduction belt 60 is stretched between the motor pulley 62 and the speed reduction pulley 58. The deceleration pulley 58 and the sub-scanning drive pulley 59 are integrally connected. 61
Reference numeral denotes a CCD sub-scanning drive motor, which is a stepping motor, and the distance for moving the CCD in one pulse is set to an integral number of the length of a pixel in the sub-scanning direction of the CCD. This facilitates the start and stop operations described later.

Reference numeral 63 denotes a motor mount on which the motor 61 and pulleys 58 and 59 are mounted.
It is made of vibration-damping steel sheet so that it does not affect the image.

Reference numeral 64 denotes a sub-scanning drive unit base, which can be moved and adjusted in the direction of arrow 17 in order to correct a magnification change due to a manufacturing error of the lens 39.

FIG. 3 is a front view of the transparent original reading apparatus.

Reference numeral 65 denotes an operation unit of the transparent original reading apparatus, and an LCD 66 with a touch panel for displaying an image or displaying a soft command based on image information read by the CCD 48, a control 67, and a copy start 68 , Copy stop 69, mode reset 70,
Each button is provided.

On the LCD screen, the image being read by the CCD 48 can be displayed in real time. In FIG. 3, the left side from the reading boundary line indicated by 71 is a portion where reading has already been completed, and the image is displayed. , Line 7
The right side of 1 indicates an area 72 that cannot be displayed because reading has not been completed yet. The display of the scroll type in this manner can alleviate the user's annoyance during the prescan.

The unit of the operation unit is unnecessary when the system of this embodiment is assembled by connecting the device of this embodiment to a device having an operation keyboard or the like and a display unit like a computer. It is attached to the reading device body. In this case, only the computer is used instead of the operation unit, and the operation itself is almost common.

As described above, the monitor image reading operation by the CCD 48 is called pre-scan, and the carrier state detecting sensor 171 in FIG. 17 described later detects that the carrier has come to a predetermined position. Start automatically. Note that the display on the LCD 66 is instantaneously displayed using the previously read image data and mode setting data when the carrier is returned to the place where the carrier has already been read after several pages are stored in the video RAM as shown in FIG. You can do it.

However, until a new image is read and an image of the entire transparent original can be displayed on the entire LCD, the CCD 48 is used.
It takes about 1 second, which is the time to complete the sub-scan due to (i.e., the time to finish the pre-scan).

An optical viewer 8 is provided to eliminate the lag time. Since this is realized only by changing the optical path by the mirror 44 shown in FIG. 2, it is possible to display an image without lag time only by inserting the carrier and turning on the illumination lamp 28.

However, if the mirror 44 is moved to a position where an image is displayed on the optical viewer 8, the image cannot be read by the CCD 48, and furthermore, there is a process such as image trimming which cannot be performed without an electronic viewer. By default, if the user does not select a mode, the electronic viewer is used preferentially.

When the user changes the mode so as to use the optical viewer, after confirming the image to be read by the optical viewer 8, the user presses the control button to cause the mirror 44 to read the image with the CCD. , And the pre-scan is started. At the same time, the pre-scan is displayed on the LCD display unit of the operation unit 65.

As another monitor image reading method, an area sensor type CCD is separately provided, and at the time of image monitoring, the optical path is switched to read an image using an area sensor provided exclusively, or an image sensor for the area sensor is further provided. If an image for monitoring is read by the area sensor without switching the optical path by providing a dedicated lens, the image can be displayed on the LCD 66 almost instantly.

In the case of optical path switching, the image is read by switching the optical path to the line type color CCD 48 when reading the image of the transmission original. By separately providing an area type CCD dedicated to the monitor in this way, the cost is increased, but a transparent original reading apparatus with excellent usability can be provided.

Further, as a method of reading a monitor image before a reading operation without using an expensive area sensor type CCD as described above, a carrier 3, 168 is mounted on the magazine 2 by using an image reading CCD 48. There is also a method of scanning the document when inserting it.

In this case, if the user
8 is completely dependent on the insertion speed at the time of insertion, an encoder for detecting the insertion speed of the carrier, a damper means for making the insertion speed substantially constant, and the accumulation of the CCD 48 in conjunction with the insertion speed. CCD control means for changing the time and the amount of light of the illumination lamp, lamp control means, and means for detecting the insertion direction of the carrier 3, 168 since the image is inverted depending on the insertion direction (pulling out and insertion). Is required.

Furthermore, the CCD 48 can be moved in the direction opposite to the carrier insertion direction to increase the sub-scanning speed at the time of relative reading, thereby reducing the reading time.

Further, as a method of making the reading and displaying operations of the monitor image comfortable, there is a method of providing a monitor image memory for storing the once read monitor image, for example, a video RAM for a plurality of images.

If the image memory is provided for a plurality of originals, when the carrier is moved to another frame, an image corresponding to the frame of the corresponding carrier is selected from the stored monitor images and displayed. It is possible to
Usability improves.

If the flow reading method is carried out in addition to the present embodiment, when the carrier 3 is inserted in the direction perpendicular to the element line of the CCD 48 (in the embodiment, the carrier 3 is inserted in the horizontal direction), the following method is used. You can skim,
When the carrier 3 is inserted from the vertical direction (vertical direction) in the embodiment, the flow cannot be read, and in this case, a monitor image must be created by the bliss scanning of the CCD 48 itself.

For this reason, as shown in FIG. 17, a carrier state detection sensor 171 for detecting the insertion direction of the carrier 3 is provided, so that it is possible to determine which method is used to read the monitor image.

Reference numeral 73 denotes a magazine fixing link for pressing down and fixing the magazine 2 to the optical unit 4;
It functions to press down the magazine fixing portion 167 shown in FIG. The positioning in the height direction and the horizontal direction of the magazine is performed by positioning notches 166.

Reference numeral 74 denotes a fixed link / latch link which functions to hold the magazine fixed link 73 at the release position when released.

When the user rotates the magazine release handle 38, the magazine release shaft 35 and the magazine release link 34
Operates to depress the fixed link / latch link.
Then, since each link moves in the direction shown by the dotted line in FIG. 3 and there is nothing to press the magazine 2 from above, the magazine can be removed upward.

Reference numeral 75 denotes a latch release link which is rotatably connected to the fixed link / latch link.
When the is inserted from above, it is pushed by the bottom of the magazine 2 and the latch release lever 76 rotates to push up the latch release link 75. Then, the link 74 is disengaged from the link 73, the link 73 is rotated by the magazine fixing spring 77, and the magazine is pressed down from above.

Reference numeral 79 designates a magazine holding link for holding the magazine at the reference position. The reason why the roller is provided at the tip is to allow the magazine 2 to move smoothly when the magazine 2 is inserted from above.

The magazine pressing link 79 is constantly urged in a predetermined direction by a magazine pressing spring 78.

Reference numeral 80 denotes a lamp socket, and the illumination lamp 28
Is a consumable part so that workability is improved during replacement work.
It is fixed to a swingable lamp base 82.

Reference numeral 83 denotes a frame on the rear side of the illumination unit 1, which is an illumination unit frame with an exhaust hole having holes for cooling lenses and the like.

Reference numeral 84 denotes a field lens / heat insulating glass support, which is a unit so that it can be easily assembled when disassembled.

Reference numeral 85 denotes a condenser lens support, which is unitized for the same purpose as the field lens / heat insulating glass support 84.

Reference numeral 86 denotes a shutter member which is provided near the illumination lamp 28 so as to be freely inserted and removed.

This is a "start and stop of CCD sub-scanning" performed by facsimile or the like when the other party receiving the image signal is a device such as a personal computer or the like having a low processing speed and the image memory is not interposed in the signal transfer part. This is because the operation must be performed.

That is, if the illumination lamp 28 is turned off every time the CCD sub-scan is stopped, the lamp temperature fluctuates, the spectral distribution of the illumination light changes, or the lamp life is shortened due to an inrush current. This is provided for the purpose of keeping the lamp in the lit state and avoiding deterioration by irradiating extra light to a transparent original such as a film.

The position indicated by the dotted line in FIG. 3 is the normal standby position, and the position indicated by the solid line is the position where the illumination light is shielded from hitting the film original.

Reference numeral 87 denotes a spring provided for biasing and positioning in a predetermined direction when the swinging lamp base 82 is not subjected to an external force.

FIG. 4 is a view of the transparent original reading apparatus as viewed from the left side.

Reference numeral 91 denotes a support plate for fixing the operation unit to the electrical box main body, 92 denotes an operation unit box provided on the rear side of the operation unit,
93 is an LCD for driving a display portion of the LCD of the operation unit
Driver board.

Reference numerals 94 and 96 are for correcting errors in the focal length of the imaging lens 39.
It is provided to adjust the distance to the 96 is C
An upper rail adjusting plate 94 provided for adjusting the position of the upper rail 95 for guiding the sub-scanning of the CD 48,
It is a lower rail adjustment plate provided for adjusting the position of the lower rail for CCD for D sub-scanning.

The adjusting plates 94 and 96, the CCD rails 55 and 95, the imaging lens 39, and the magazine 2 are all mounted on the frame of one optical unit 4.
The optical system can be adjusted only by the optical unit 4. As a result, a high-precision optical system can be configured as an independent unit without depending on the accuracy of the electrical box section, so that the assemblability is also improved.

That is, by configuring the rigidity of the optical unit 4 to be higher than the rigidity of the electrical box, the high-precision part can be concentrated only on the optical unit.
Other units such as the sub-scanning drive unit can be manufactured with relatively low accuracy, and it is not necessary to manufacture the entire unit with a high-precision frame as in the related art, so that the cost reduction effect is greatly increased.

The same effect can be obtained by holding the optical unit 4 at three points with respect to the electrical box and making the remaining mounting portion flexible in a direction perpendicular to the mounting surface. it can. In this case, there is no need to consider the difference in rigidity. It is a general method to use an elastic member such as a leaf spring or rubber as a means for attaching the flexible structure.

Reference numeral 97 denotes a handle 3 for releasing the magazine 2
This is a handle return spring for urging the handle 8 in a predetermined direction.

Reference numeral 98 denotes an electrical base grounding screw for grounding the electrical base 7 constituting the bottom of the electrical box at multiple points. Since the ground screw 98 is located at a position retracted by a distance indicated by 108 from the outer wall as will be described later with reference to FIG. 5, it is in a position that cannot be easily seen from the operation position, and is very preferable in appearance.

Further, since the screws are fixed at multiple points as described above, the rigidity of the electric component box can be considerably increased. The material of the screw is a material having good conductivity such as brass, so that the electrical contact is ensured.

Reference numeral 99 denotes a negative film window of the negative film carrier 3, and H2 denotes the distance from the end of the carrier 3 to the center of the third frame. H0 indicates the distance from the surface 110 on which the entire transparent original reading device is placed to the center of the original. In this embodiment, H0 ≧ H2.

This is because, when the carrier 3 is used in the vertical direction, half of the six frames of a normal negative film can be inserted into three frames, and the other half can be inserted from the opposite side of the carrier 3 and used. is there. At this time, the image to be copied is turned upside down by 180 °. However, a sensor for determining the insertion direction of the carrier 3 is attached to the magazine 2, and when the carrier 3 is inserted from the opposite side, the signal is automatically electrically turned 180 °. Turn it over.

That is, the sub-scanning direction of the CCD 48 is automatically turned over. At this time, the image information in the main scanning direction of the CCD is also inverted using the line offset correction memory. This prevents the image from being turned over even if the carrier 3 is inserted from the opposite side.

As will be described later, in this embodiment, a selection means is provided so that the user can selectively turn the image upside down.

Conventionally, even when the carrier 3 is used vertically, it is necessary to have a height in which all the frames of the carrier can be accommodated in one direction. Therefore, the height of the entire apparatus is increased, and it is difficult to reduce the size of the apparatus. However, this automatic inversion mode has made it possible to keep the height of the device significantly low. The carrier 3 can be used in one direction as long as the carrier 3 is inserted vertically when the carrier 3 is vertically inserted and the hole into which the carrier 3 enters is provided at the corresponding position on the mounting table. Becomes The mounted film carrier 168 for fixing the film stored in Mawton will be described later with reference to FIG.

FIG. 5 is a view of the transparent original reading apparatus as viewed from the rear side.

Reference numeral 105 denotes an outer cover of the entire transparent original reading device made of a mold or the like which is an insulating material. By using an insulating material, grounding can be omitted.
Can be easily installed.

Reference numeral 106 denotes an image signal output connector attached to the electric board 12. Reference numeral 107 denotes a power supply inlet to which an AC power supply is connected. Reference numeral 108 denotes the above-described screw hidden step, and by making the electrical component box shape like this, the electrical component base 7 can be pulled out and the screw 98 for grounding can be seen from the normal use state position. Has been successfully eliminated. This makes it possible to omit the exterior cover for hiding the screws, thereby reducing the cost spent on the exterior.

Reference numeral 109 denotes a ground screw between the electric base 7 and the frame of the electric box section. Since the rear side is difficult to see in a normal use state, the screws are used in an exposed state. However, like the screws 98 on the lateral side, a step may be provided and hidden.

Although the side frame of the electrical component box and the electrical component top plate 111 are also assembled with screws in the embodiment, the grounding may be reduced by maintaining a high rigidity even when the electrical component base 7 is removed as a welding structure. Better to be sure.

FIG. 6 is a cross-sectional view of the transparent original reading apparatus viewed from the right side.

Reference numeral 116 denotes a rotation center of the mirror 44 for switching the optical path of the optical viewer 8, and the conductive mirror holder 1
22. When the mirror 44 is at the position indicated by the dotted line in FIG. 6, that is, when the light is directed toward the CCD 48, the top plate of the optical unit 4 and the mirror holder 122 together close the hole for the optical viewer 8, and the electromagnetic noise generated by the CCD is generated. Is prevented from leaking. That is, mirror and CC
This is possible because D operates exclusively.

Reference numeral 117 denotes an analog cable made of a flexible board for transmitting an analog signal from the CCD 48 to the electric board 12. 119 is a bottom plate of the optical unit 4. Reference numeral 120 denotes a slider which sandwiches the CCD rails 55 and 59 from the horizontal direction, and is fixed to the CCD scanning base 53, and the rail opposite to the reference side sandwiches the rails with a spring property.

The parts supporting the CCD scanning base 53 in the vertical direction are roller bearings 54 and 46. This is because, when receiving weight in the vertical direction, the load is greater than that in positioning in the horizontal direction, so that the use of sliding increases the load for sub-scanning.

Reference numeral 121 denotes a substrate grounding member, which electrically contacts the CCD driver substrate 47 with the CCD scanning base 53. Further, the CCD scanning base 53 passes through the bearing press-fit shafts 157 and 158, and
7, and are electrically contacted with the CCD rails 55 and 95. Therefore, the bearings 46 and 47 use conductive bearings or bearings containing conductive grease.

The CCD rails 55 and 59 are connected to the optical unit 4 and eventually make ground contact with the entire device.

The signal ground of the analog signal of the CCD is performed by an analog cable 117.

Reference numeral 123 is fixed to the CCD scanning base 53,
A scanning body fixing member whose end is fixed to the CCD sub-scanning driving belt 57. 124 is a CCD sub-scanning drive belt 5
7 is a belt presser holding the belt 57 together with the scanning fixture 123 and fixing the belt 57 therebetween.

In FIG. 6, the infrared cut filter 51
Is inclined from the vertical plane in the direction shown in the figure. This is to prevent dust and dust from accumulating on the outer surface of the infrared cut filter 51. Note that the inside surface of the infrared cut filter 51 and the glass of the CCD 48 itself are prevented from adhering dust and dirt by the CCD cover 52.

The infrared cut filter 51 also has an effect as a dust filter.

As a result, dust and dirt do not adhere to the mirror and the filter, so that cleaning work, which is maintenance work for maintaining image quality, can be omitted for a long time, and a good image can be maintained for a long time.

FIG. 7 is a top view of the sub-scanning drive unit.

Reference numeral 131 denotes a belt tension spring for applying tension to the CCD sub-scanning drive belt 57, 132 denotes a positioning hole for mounting, and 133 denotes a bearing. This is because a force twice as much as the belt tension is applied to the idler pulley 45, and the motor 61
The belt tension greatly changes depending on the rotation direction of
48 sub-scanning movements are different between sub-scanning going and returning,
This is because it becomes unstable. Therefore, in order to reciprocally drive the CCD 48, the rotational load of the idler pulley 45 must be as small as possible. For this reason, bearings are used in this part even though the cost is high.

Reference numeral 134 denotes a tensioner shaft.
37. The tensioner plate 137 includes guide shafts 136, 13 fixed to the sub-scanning drive unit base 64.
Guided at 9. Reference numerals 135 and 138 denote guide holes at that time in consideration of the assembling workability.
A portion larger than 6,139 is provided so that it can be disassembled here. The belt tension spring 131 pulls this tensioner plate.

Reference numeral 140 denotes a sensor fixing plate for fixing the sensors 49, 50 and 56 required for the sub-scanning of the CCD 48 to the sub-scanning drive unit base 64.

Reference numeral 141 denotes an idler shaft fixing plate, which is a reinforcing plate for fixing the idler shaft 142 so that the idler shaft 142 loses the belt tension and does not tilt. Reference numerals 143 and 144 denote escape holes for mounting, and no positioning is performed at these portions.

Reference numeral 145 is a positioning reference when the sub-scanning drive unit is fixed to the main body box. The optical path length, that is, the positions of the rails 55 and 95, are adjusted according to the variation in the focal length of the lens 39 of the optical unit 4. The lower rail adjusting plate whose position is determined when the adjustment is performed, and the lower rail adjusting plate abutting portion 146 which is a part of the lower rail adjusting plate abuts against the lower rail adjusting plate for positioning. Thus, the relative positions of the optical unit 4 and the CCD sub-scanning unit are determined.

FIG. 8 is a rear view (side view of FIG. 7) of the CCD sub-scanning drive unit.

Reference numeral 147 denotes a magnet damper for reducing rotational vibration caused by the CCD sub-scanning drive motor 61, and is coupled to the motor shaft 148 with a predetermined torque by a magnetic force. As described above, the motor mount 63 is made of a damping steel plate to prevent resonance and to prevent the vibration of the motor from being transmitted to the CCD from portions other than the belt.

As the belts 57 and 60, TN belts manufactured by Bando Kagaku Co., Ltd. are used. This is a belt tooth profile having a triangular cross-sectional shape with a vertex angle of 70 °, and the backlash is made almost zero.

As a result of the experiment, a conventional general toothed belt is used when transmitting the forward / reverse rotation without backlash as in the embodiment of the present invention and when using it where precise movement is required. Vibration caused by the belt was extremely small rather than effective.

FIG. 9 is a view of the CCD unit viewed from the front side.

As shown in FIG. 9, the CCD sub-scanning drive belt 57 is connected at substantially the center of the CCD unit.

Reference numerals 159 and 160 denote holes for fixing the analog cable retainer 155 for holding the analog cable 117, as described later with reference to FIG. .

FIG. 10 is a view of the CCD unit viewed from above.

In FIG. 10, reference numeral 155 denotes an analog cable holder, which fixes the analog cable 117 to the CCD scanning base 53. Reference numeral 156 denotes a CCD socket.
Reference numeral 48 is attached so as to sandwich the CCD scanning base 53 and is pressed against the CCD scanning base 53. Thereby, the position of the CCD 48 is determined and at the same time, the CCD 48 is positioned.
The heat generated from 48 is released through the CCD scanning base 53.

For this purpose, the CCD scanning base 53 is black to facilitate heat radiation. This also has the effect of preventing diffuse reflection. Bearing press-fit shafts 157 and 158 are fixed to the CCD scanning base 53, and bearings 46 and 47 are press-fitted to the shafts. The press-fit shaft is a straight shaft with no steps and is centerless polished to control the shaft diameter with high precision to bring out the performance of the bearing.

FIG. 11 is a view of the CCD unit viewed from the right side.

Reference numeral 161 denotes an analog cable socket provided on the CCD driver board 47. The infrared cut filter 51 is fixed to the CCD unit as shown in FIG. 11, and is inclined so that dust and dirt do not adhere as described above. The optical path shifts in the main scanning direction of the CCD due to the inclination. The amount of the deviation can be calculated from the refractive index, thickness, and the amount of inclination of the filter. Therefore, the CCD 48 is raised in the main scanning direction by a distance to correct the deviation. .

FIG. 12 is a perspective view of the magazine unit.

Reference numeral 166 denotes a positioning notch for positioning the magazine 2 in the optical unit, where the magazine is positioned. Reference numeral 167 denotes a magazine fixing portion for pressing the positioning notch 166 of the magazine 2 against a positioning pin (not shown) provided on the optical unit side.
Magazine fixed link 73 and magazine fixed spring 7
7, this part is pressed down and fixed.

FIG. 13 shows a carrier of a film such as a positive film in a mount.

In FIG. 4, the size when the film is used in the vertical direction in the case of the six-spelled negative film is described. However, the same applies to a film carrier such as a positive film which is contained in Mawton. State.

In FIG. 13, H1 represents the distance from the end of the film carrier 168 with a mouton to the center of the center window, and H0 ≧ H1 with respect to H0 shown in FIG. Thus, the height of the main body can be made lower by (H1'-H1) than the conventionally required H1. This has made it possible to reduce the height of the apparatus.

FIG. 14 shows a carrier for a continuous negative film.

In this case, as in FIG. 13, (H2'-H
2) Only the height of the main body can be reduced. However, in this embodiment, since H1> H2, the actual value that can reduce the height of the main body is (H1'-H1).

FIG. 15 is a perspective view showing a state where the carrier is inserted into the magazine unit.

FIG. 16 is a perspective view of the optical unit 4.

Reference numeral 179 denotes an image forming surface for connecting the images of the transparent original, and this image forming surface is a common tangent line between the two rails 55 and 95. Further, sub-scanning is performed such that this surface is coincident with the light receiving surface of the CCD 48. Thereby, the CCD 48
Is tilted in the main scanning direction about the axis of the rail 55 or an axis parallel to the rail 55, the displacement of pixels in the main scanning direction can be minimized.

FIG. 17 is a perspective view of a magazine.

Reference numeral 169 denotes a carrier pressing spring, 170 denotes a click spring for positioning the frames of the carriers 3 and 168 and the magazine, and 172 denotes a carrier pressing spring.

Reference numeral 171 denotes the state of the carrier, that is, whether the carriers 3 and 168 are used by being inserted horizontally or vertically, being used for the negative film carrier 3, or the carrier 168 for mounting a film.
Or a carrier state detection sensor for detecting whether a film is contained, whether the film is a positive film or a negative film, and the like.

The light amount of the illumination lamp 28 is changed, and the filters 26 and 32 are switched according to the detection state of these sensors.

FIG. 18 is a schematic block diagram of an electric component.

Reference numeral 188 denotes an AF not shown so far.
This is a motor home position sensor. This determines the home position during one rotation of the lens drive motor 41. Since a stepping motor is used as the motor 41, an arbitrary position during one rotation can be reproduced.

Reference numeral 189 denotes an automatic changer, which is not shown in the embodiment but is an automatic film changing unit with a mouton, which automatically reads the film while automatically changing the film stored in the mount. In the embodiment, the magazine 2 can be used exclusively instead of the magazine 2.

Reference numeral 190 denotes a safety thermo switch provided near the illumination lamp 28, which is provided between the illumination lamp 28 and the fan 9, and is used when the fan 9 breaks down and the temperature rises excessively. The power supply to the power supply is cut off.

191 is an A connected to the inlet 107
C power cord, 192 is an operation button 67 of the operation unit 65,
It is a switch board for 68, 69, 70. 193 schematically shows the optical axis. The description of the configuration has been completed above, and the operation of the above configuration will be described next.

The operation will be described below.

In this embodiment, since the operation unit 65 having the LCD and the touch panel integrally attached is provided separately from the optical viewer 8, when the transmission original is a negative film, the LC
D66 can be displayed in a negative / positive inversion.

[0158] This is a problem that the monitor image cannot be seen until the pre-scan is completed if only the electronic viewer is used. Therefore, there is a drawback that the user is frustrated. ,
This is because the normal display of the negative image cannot be performed, and it is necessary to keep the illumination lamp 28 lit as long as the negative image is displayed on the monitor, which is disadvantageous in that the film original is easily damaged.

By providing both, the monitor of a transparent original image such as a film can be immediately viewed on the optical viewer 8, and a monitor image for advanced final image check such as negative / positive inversion, trimming, and image rotation can be electronically displayed. It can be displayed in the viewer.

Further, since the image information once read by the pre-scan is stored in the monitor image memory, the illumination lamp 28 can be turned off by using an electronic viewer, so that there is an advantage that the film original is not damaged. is there.

However, since the use of both monitors cannot be started at the same time, this embodiment is provided with a means for the user to selectively switch which monitor is used preferentially.

That is, the prescan of the CCD 48 is performed first to display the monitor image on the electronic viewer, and then the monitor image is switched to the optical viewer 8, or the monitor image is displayed on the optical viewer 8 first. The user can select whether to switch to the electronic viewer later by a user operation.

The LCD display section 66 can display not only normal display trimming but also a layout such as image rotation, enlargement, and reduction of a copied image in conjunction with a copying apparatus. This makes it possible to use a device that is easier to use than a conventional device using only an optical monitor.

These are things that cannot be realized with an optical viewer, and the operability is greatly improved.

For example, in the apparatus of the embodiment, the LCD display unit communicates image information with the copier main body, and can display an image read by the copier main body. It has become. As a result, the image after trimming by the digitizer or the like provided on the copying apparatus main body side can be confirmed in advance without actually performing the copying operation.

At this time, the image of the copy sheet and the corresponding trimmed image are displayed on the LCD 66.

In this embodiment, since the carrier 3 can be set in the vertical and horizontal directions, the optical viewer 8 has a square shape. However, because the manuscript is not square,
If a square monitor screen is prepared so that portrait and landscape documents can be displayed, useless portions become large.

In order to solve this problem, the operation section 65 having the LCD 66 with a touch panel, which is an electronic viewer of the present embodiment, can rotate and display an image by 90 ° according to a user's selection. . By doing so, it is possible to adjust the direction of the monitor display image to a direction that matches the size of the LCD 66 and display a large image by effectively using the screen.

Further, in this embodiment, an image half-rotation selecting means is provided so that the monitor image can be rotated by 180 ° in case the user sets the original upside down by mistake. At this time, the sub-scanning direction and the main scanning direction of the CCD are also reversed so that the read image information is in accordance with the monitor screen. This eliminates the need to replace the carrier when a mistake is made as before.

Further, color calibration of the monitor screen and the printer device can be performed to display the color of the image after the copy has been performed. However, electronic monitors are color-reduced composites, and copying is the opposite, so they do not exactly match. However, the advantage of obtaining almost the same image before copying is very large, which is also an advantage unique to the electronic viewer.

In the present embodiment, since the LCD display section 66 has a small screen size, a monitor terminal is provided so as to connect a larger CRT monitor or the like. This makes it possible to easily construct a system with a large monitor when used in combination with a full-color copying machine or the like.

Next, the operation of the autofocus will be described.

The basic operation will be described. First, a transparent original is set, that is, the carrier 3 is set in the magazine 2.
When it is detected that each frame of the carrier 3, that is, the film has reached a predetermined projection position in the magazine 2, the user can arbitrarily use the timer setting means to prevent the user from being surprised. After a settable predetermined time of about 0.3 to 2 seconds, monitor image reading (hereinafter referred to as pre-scan) is started, and at the same time, the focal position of the autofocus lens is measured over the entire movable range of the lens 39. I do.

As a result, the pre-scan is performed simultaneously with the auto-focusing. At this time, the monitor image is strictly displayed as a blurred image. However, since the display density of the monitor is extremely coarse, there is no practical problem. Level.

The exposure correction value measurement is performed in the return scan (back scan) of the prescan, and after measuring the exposure correction value, the lens is moved to a position where the lens is in focus.

This is because the measurement of the exposure correction value is performed exclusively with the operation of the auto-focus, so that the focus is kept as little as possible, and the image is optically averaged.
This is because exposure correction is performed without being affected by the contents of the image of the transparent original as much as possible.

That is, during pre-scanning, the cam 40 is rotated by the motor 41 at the same time that the monitor image is read.
The frequency component of the image is measured by moving the lens 39. In the return scan (back scan), the exposure correction value is measured with the focus deliberately removed. Thereafter, the lens 39 is moved to the measured focal position.

As another method, the lens is first moved to a position where it is unlikely to be in focus, the exposure correction value is measured (AE) at the same time as the prescan, and the autofocus operation (focusing) is performed in the return scan. Position measurement).

However, if the image is not displayed quickly on the LCD monitor 66, the usability deteriorates. Therefore, it is common to simultaneously read the monitor image in the first scan.

When the carrier 3 is moved to another frame during the timer counting from the time when the carrier 3 reaches the predetermined projection position to the time when the prescan is started, the prescan is naturally stopped. Even when the user moves the carrier 3, the pre-scan is stopped, the CCD is moved to the home position, and the apparatus stands by.

FIG. 19 shows a schematic operation flowchart.

Next, when the measurement of the exposure correction value is completed, the focus is set. That is, the second rotation of the cam 40 based on the measurement data of the autofocus rotates the cam 40 to “the lens position at which the image frequency becomes the highest” = “the rotation angle of the cam at which the image frequency becomes the highest”. .

At this time, the lens position is
And the position of the lens drive cam 40 is determined by the number of steps of the motor 41 from the rotation position of the home position of the lens drive motor 41.

In the embodiment, the eccentric circular cam 40 is directly fixed to the motor shaft, and returns to the original home position position by one rotation of the motor shaft, and the lens position is determined at the second rotation. ing. In this manner, the lens position can be accurately determined regardless of the cam curve accuracy of the cam.

Next, a contrivance used in this embodiment for speeding up the autofocus operation will be described.

A transparent original may be fixed to various mounts such as a reversal photographic film.

When this is fixed to the magazine 2 with the carrier 3 interposed therebetween, the film surface moves in accordance with the thickness of the mount, and a phenomenon that the focus is not achieved eventually occurs.
To solve this, an autofocus mechanism is required.

However, once the type of mount is determined, the amount of deviation of the film surface position due to this mount does not greatly deviate every time. Therefore, for the first document of the carrier 3,168, the focal position is measured over the entire lens stroke. From the second frame, the measurement is performed only in the vicinity of the initially focused position, and the measurement is omitted in the other portions to move the lens at high speed.

As a result, the auto-focusing operation becomes faster from the second time, the time for which the user waits can be reduced, and the usability is improved.

Although not described in the embodiments, as an application of this method, the range of autofocusing can be limited by providing a means for detecting the position of the film surface or a means for detecting the thickness of the mount. And the same effect as in the above case can be expected.

As one example, a case of a negative film will be described. In the case of a negative film, the film is often used as it is sandwiched between the carriers 3. If it is in the mount, it can not be mounted on the carrier 3 for negative film, so when the carrier 3 is used, it can be seen that the film is without Mawton, and the position is automatically narrow Limited to range. Based on this, a sensor for detecting that the negative film carrier 3 is used is provided, and if the carrier 3 is used, the position of the film should be predicted from the beginning and the autofocus operation should be performed. I understand.

Conversely, when the carrier is a mouton-equipped film carrier 168, it can be seen that the position of the film surface varies with the thickness of the mount, so the autofocus operation must be performed over a wide range. For the above reason, in the embodiment, the sensor for determining the type of the carrier is attached to the magazine 2.

In this embodiment, the monitor image is read in the first pre-scanning scan, the document area is measured and the auto focus (AF) is performed, and the return portion (back scan) is performed.
Is used to measure the exposure correction value (AE). For more accurate autofocus, it is better to stop the image for focusing, that is, it is better to stop the CCD 48 at a predetermined place. For this reason, the user can select a normal auto focus in which the lens is moved while reading a predetermined position of the document (usually, the central portion of the document).

When the user selects the high-precision auto-focus mode using this selection means, after the copy button is pressed, a higher-precision auto-focus operation is additionally inserted before the actual image is read. Has become.

Here, one method for further accelerating the autofocus operation of this embodiment will be described.

By forming the cam 40 in an exactly symmetrical shape, the cam surface is divided at two inflection points of the cam 40 and measured on one cam surface, and the focal position on the other cam surface is calculated. , And the cam can be rotated to that position to move the lens position to the focused position.

In this case, unlike the present embodiment, the cost of the cam is slightly increased because the machining accuracy of the cam surface is completely relied on, but the rotation angle of the cam 40 can be reduced to half and the lens can be moved at high speed. As a result, the autofocus operation can be completed at a high speed.

The same can be said for a case where a cam having more cam inflection points is formed and the cam surface is divided into three or more by one rotation of the cam. That is, if the relationship between the rotation angle of one cam surface and the rotation angle of the next cam surface can be completely calculated, the autofocus operation can be performed at a high speed using two continuous cam surfaces.

Further, if the rotation angle of the cam and the position of the lens can be accurately matched, the cam does not necessarily have to be a symmetrical shape, but may be a complex asymmetrical cam.

If it is uneasy to completely rely on the accuracy of the cam shape, the relationship between the cam rotation angle and the lens movement position is measured and stored in the RAM area of the main board 12, and the data is referred to. By calculating the rotation angle of the cam, the autofocus operation can be performed with higher accuracy without being affected by the manufacturing accuracy of the cam.

[0201] Monitor screen control related to autofocus will be described below.

In this embodiment, when the pre-scan for displaying on the monitor screen of the LCD 66 is performed simultaneously with the measurement of the exposure correction value, the lens position is fixed at a predetermined image blurred position. Then, when the lens is moved to the focal position, the magnification of the monitor image and the actual reading magnification slightly change.

Also, when linked with the autofocus operation, the lens position is constantly changing. Thus, the monitor image is actually an image in which the magnification changes periodically.
To prevent this, the magnification displayed on the monitor screen is back calculated according to the position of the lens during the auto focus operation, and the change is corrected. This makes the magnification constant over the entire monitor screen. However, when the lens is moved to the focal position after this, the actual reading magnification and the display magnification of the monitor screen are slightly different, as in the case described above, and there is a disadvantage that the operation does not exactly match when performing operations such as trimming. I do.

In order to avoid this inconvenience, when an operation for which the reading magnification must be strictly performed, such as trimming, is performed, the monitor image is read again when the lens is in focus. ing.

[0205] The characteristic operations performed in this embodiment will now be described.

First, the CCD accumulation time is varied by the exposure correction value.

In this embodiment, in order to optimally read each original, the amount of light reaching the CCD 48 is kept constant by changing the amount of light of the illumination lamp in accordance with the original.

However, when the original is almost transparent so that the exposure cannot be corrected by reducing the light amount of the lamp, the correction is performed by changing the accumulation time of the CCD 48 to a short time.

At the time of reduction, image information is averaged by neighborhood processing instead of simply thinning out image information.

Conventionally, information is simply thinned out and compressed. However, by performing neighborhood calculation processing between pixels as described above, image quality at the time of reduction is improved.

A device for removing dust and dirt on the film surface before reading is provided.

When reading a transparent original, there are many cases where pixels of an image are equivalent to dust, dust, and the like. In order to solve this problem, a device for removing dust and dirt from the film surface with a brush, suction air, a cleaning roller with an adhesive, or the like may be provided separately from the reading device or may be built in. Especially 3
It has been found that the effect of the dust image is extremely large for a document having a large magnification when reading such as a 5 mm film, and the effect of removing dust to improve the image quality is very large.

The enlargement / reduction is performed by using both the change in the sub-scanning speed of the CCD and the image processing.

In the enlargement direction from the basic magnification, the image is optically enlarged and read by reducing the CCD sub-scanning speed according to the magnification. At the time of reduction, the image information is electrically averaged and compressed, and the CCD sub-scanning speed is kept at the basic magnification. As a result, the drive frequency range of the sub-scanning drive motor 61 of the CCD can be narrowed, and the risk of image blur due to resonance between the drive frequency of the motor 61 and surrounding mechanical parts can be reduced.

Further, since it is not necessary to move the CCD 48 at a high speed, the approach distance for accelerating the motor from a stopped state to a steady speed can be shortened. As a result, the space for the sub-scanning can be reduced, and the size of the apparatus can be reduced.

The cooling of the apparatus will be described.

The cooling air flow of the device is sucked in from the rear of the electrical box, rises from the bottom of the lighting unit, and is exhausted rearward through the lens of the lighting unit. This allows one fan 9
This makes it possible to cool the heat generating portion of the entire apparatus. This is also one of the effects of using the box structure for the electrical components.

Next, the skip operation will be described.

The presence / absence of a film is checked, and if it does not exist, it is skipped and a message is displayed.

It is possible to predict from the output of the CCD 48 that there is no original or no image at the start of monitor image reading. If there is no film using this, stop reading the monitor image,
I have a message. This prevents the user from performing erroneous operations and prevents wasting time.

[0221] Storage of the carrier will be described.

Carriers 3 and 168 are provided with hook holes 173 and 174 for storage so that they can be hooked on pins or the like when not in use.

Further, as a place, a part of the outer cover is dented in the form of a carrier, and the unused carrier is stored in that part to prevent loss, and the appearance is also preferable.

A description will be given of the configuration in which the autochanger is slidable in the optical axis direction.

Autochanger 1 shown in FIG.
Reference numeral 89 denotes a device for automatically exchanging and reading a film using a curl cell for organizing a 35 mm mounted film manufactured by Eastman Kodak Co., Ltd.

In this embodiment, the magazine 2 is used by being mounted exclusively. The use of these two types of film fixing devices is not preferable in terms of cost.

As a solution to this problem, a method is conceivable in which the carriers 3 and 168 can be directly mounted on the autochanger 189.

To realize this, it is necessary that the position of the film does not change (do not shift) in the optical axis direction even when the carriers 3 and 168 are used. Therefore, when the autochanger 189 is configured to be movable in the optical axis direction and the carrier 3, 168 is used, the autochanger 189 is shifted in the optical axis direction, and the “insertion port of the carrier 3, 168” provided in the autochanger 189 is used. The configuration is such that the position moves to the imaging position.

In this case, however, the autochanger 189 is used again after the film of the carriers 3 and 168 is removed or the carrier itself is removed.

A description will be given of the document edge detection.

In this embodiment, in order to reduce the reading time, when the copying operation is actually started, the original end is detected, and from the second sub-scan, the sub-scan is performed only between the detected original ends. ing. At this time, the movement of the CCD 48 starts at a constant acceleration from the CCD standby position,
The edge of the document is detected and reading of the image is started. At the same time, the position of the document end is stored in the RAM.

However, conventionally, the reading speed (CC
(The sub-scanning speed of D48) is too fast to read the position of the document end accurately, so that while moving from the standby position of the CCD to the document end, the document was moved at the speed at the time of actual image reading. .

However, it is possible to move at a higher speed from the standby position to the actual document end, and if the speed is reduced to the image reading speed immediately before reaching the document end, useless time can be reduced. It is.

This can be solved if the size of the image of the transparent original in the sub-scanning direction can be predicted to some extent. That is, in order to predict the image size of the film, a sensor for detecting whether the insertion direction of the carriers 3 and 168 is vertical or horizontal is provided in the magazine 2, and the size of the document in the sub-scanning direction is predicted to some extent. .

In this manner, the CCD is used up to the vicinity of the edge of the original.
By moving the 48 at full speed and approaching the predicted document end position and reducing the speed to the image reading speed just before the document end is considered to be reached, the document end detection can be performed at a higher speed than before, It can ease user's frustration. In particular, when the carriers 3 and 168 are inserted in the vertical direction, the effect is large and effective. This is because, when the original is turned in the vertical direction, the required search area in the sub-scanning direction becomes about 1 / 1.5.

The storage of the copy mode for each frame in carriers 3 and 168 will be described.

As shown in FIG. 15 and the like, the film original stored in the carrier 3
If the film 8 is not removed from the magazine 2, the exchange of the film original is extremely difficult.

Unless the carriers 3 and 168 are taken out of the magazine 2 by utilizing this, it is assumed that each frame and the document correspond one-to-one. In this embodiment, trimming or the like is performed for each frame in the carriers 3 and 168. Is read, and the previously set mode and monitor image are recalled as long as the carriers 3 and 168 are not removed from the magazine 2.

In this way, when reading is to be performed again, the work can be performed more quickly from the second time.

The following describes the deceleration distance at the time of start and stop.

In this embodiment, the read image information can be transferred to the computer by using the SCSI interface. However, at this time, since the speed of information that can be transmitted with respect to the read image information becomes slow, the image reading must be performed in a start / stop mode. At this time, it is desirable that the sub-scanning speed of the CCD immediately becomes zero, and that the original image reading speed becomes instantaneously at the time of startup.

However, in reality, such a situation is not possible. When the vehicle stops, an overrun occurs, and when the vehicle accelerates, a running distance is required. Or, even if it does not reach that point, at the time of start and stop, the CCD vibrates and the image is easily disturbed.

In order to prevent this, in the present embodiment, the reading is resumed by returning from the reading stop position in the reverse direction by "the distance of overrun + the approaching distance during acceleration" and then accelerating again by the approaching distance. As a result, the reading can be resumed exactly at the position where the reading was stopped, so that useless time can be saved. (Other Embodiments) In the embodiment, the reading elements are arranged as line sensors and are arranged in the vertical direction. However, the same effect can be obtained by applying the present invention to an apparatus using elements horizontally such as a flatbed scanner. I can give it.

FIG. 22 shows this state. 51 is an infrared cut filter, and 48 is a CCD (reading element).

[0245]

The present invention has the above-mentioned structure and operation. The lens side surfaces of a plurality of filters are inclined downward from the vertical, and the filter and the reading element are connected by a cover member so as to cover at least the upper part of the filter. Therefore, dust and dirt do not adhere to the mirror and the filter, so that cleaning work, which is maintenance work for maintaining image quality, can be omitted for a long time, and a good image can be maintained for a long time.

In addition, all mirrors and filters close to the imaging lens, which are relatively insensitive to dust and dust adhesion, are fixed as vertical planes to minimize dust and dust adhesion. And cleaning maintenance work can be omitted for a long time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a transparent original reading apparatus according to the present invention.

FIG. 2 is a plan view of the transparent original reading apparatus of the present invention.

FIG. 3 is a front view of the transparent original reading apparatus of the present invention.

FIG. 4 is a left side view of the transparent original reading apparatus of the present invention.

FIG. 5 is a rear view of the transparent original reading apparatus of the present invention.

FIG. 6 is a cross-sectional view of the vicinity of an optical system when the transparent original reading apparatus of the present invention is viewed from the right side.

FIG. 7 is a plan view of a CCD sub-scanning drive unit.

FIG. 8 is a rear view (a side view of FIG. 7) of the CCD sub-scanning drive unit.

FIG. 9 is a front view of the CCD unit.

FIG. 10 is a plan view of a CCD unit.

FIG. 11 is a right side view of the CCD unit.

FIG. 12 is a perspective view of a magazine unit.

FIG. 13 is a perspective view of a film carrier in a mount such as a positive film.

FIG. 14 is a perspective view of a carrier for a continuous film of negative film.

FIG. 15 is a perspective view showing a state where a carrier is inserted into a magazine unit.

FIG. 16 is a perspective view of an optical unit.

FIG. 17 is a perspective view of a magazine.

FIG. 18 is a wiring diagram of an electric component.

FIG. 19 is a basic flowchart of the present embodiment.

FIG. 20 is a perspective view of another embodiment of the unit connecting method of the present invention.

FIG. 21 is a schematic view of still another embodiment of the unit connecting method of the present invention.

FIG. 22 is an arrangement diagram of image reading means according to another embodiment of the present invention.

FIG. 23 is a schematic view of a conventional document reading apparatus.

[Explanation of symbols]

 Reference Signs List 1 illumination unit (illumination system) 2 magazine (holding means) 4 optical unit 37 mirror 39 imaging lens 48 CCD (reading element) 51 infrared cut filter 52 CCD cover (cover member)

Claims (5)

(57) [Claims] An illumination system for illuminating a document, a holding device for holding the document, a reading element, a lens for forming an image on a reading surface of the reading element, and a filter provided between the reading element and the lens A document reading apparatus comprising: a document, wherein a lens side surface of the filter is inclined downward from a vertical direction, and the filter and the reading element are connected by a cover member so as to cover at least an upper portion of the filter. Reader. 2. The document reading apparatus according to claim 1, wherein the reading element is lifted by an amount corresponding to a shift of the optical axis due to the filter, and the center of the reading element is aligned with the center of the optical axis. 3. The document reading apparatus according to claim 1, wherein the filter is an infrared cut filter that cuts light in an infrared region of a light spectrum from the illumination system. 4. The document reading apparatus according to claim 1, wherein said filter is a dustproof filter. 5. The mirror according to claim 1, wherein the mirror, the filter and the reading element between the original and the reading element, except for the filter, are all mounted in a vertical plane. Or the original reading device according to 4.