JPH0541774A - Image reader - Google Patents

Abstract

PURPOSE:To shorten the optical path length of transmission light, to improve reading quality, and to reduce the cost of a power source for illumination by enabling a light source unit for transmission to be linked mechanically and electrically with a reading unit with an original platen sandwiched in upper and lower directions. CONSTITUTION:The reading unit 40 is provided with a light source unit for reflection reading. Driving mechanisms 33-37 which reciprocate the unit 40 and the power source units for illumination 8, 25 are housed in a casing 1. Also. a light source unit 20 for transmission reading is provided separately from the easing 1, which image-forms original transmission light and original reflection light on the light receiving plane of a read sensor CCD in the unit 40. The unit 20 can be linked with the unit 40 mechanically and also electrically via link mechanisms 23, 24 with releasing function. The unit 40 and the casing 1 are provided with relief parts 6(right and left) in the arrow head scanning direction of the link mechanisms, and the power source unit for illumination is provided with an inverter power source in common to the light source unit for reflection reading and the unit 20, and a light source switch capable of supplying light source by switching to the unit 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device.

[0002]

2. Description of the Related Art FIG. 15 shows an image reading apparatus for both a reflective original and a transparent original which can read both a reflective original and a transparent original. In the figure, 70 is a casing, 71 is a reading unit, 72 is a document table, and 73 is a light source for a transparent document.

In the case of reading a transparent original, a light source 73 for the transparent original is provided outside the casing because a better image can be obtained by arranging the light source above the original. Therefore, the original table is moved from a structural point of view. As an expression.

[0004]

This conventional image reading apparatus is an image reading apparatus for both reflective originals and transparent originals.
Since the platen is moved, there is a drawback that a large installation space is required.

Of course, if the platen is fixed, this problem will be solved. However, since the light source section and the reading section must be moved integrally, the structure becomes complicated, and in the case of performing reflective reading, it is transparent. The light source for scanning is an obstacle, and it is necessary to store it separately.Therefore, in addition to the power source that supplies power to the light source for reading reflective originals, there is power to the light source for transparent original reading. There is a problem in that a power supply for supplying the power is required, and the cost is increased accordingly.

The present invention has been made to solve this problem, and enlarges a fixed original / reflecting original dual-purpose machine that can read a reflective original with a light source for transmission set. It is an object of the present invention to provide an image reading apparatus that can be realized without any need and can reduce the cost of an illumination power source as compared with the conventional one.

[0007]

In order to achieve the above-mentioned object, the present invention has a transparent platen on a top plate and a reading unit having a light source unit for reflective reading therein, and a reading unit for the reading unit. It has a casing that houses a drive mechanism that reciprocates from a position and a power supply unit for illumination, and has a light source unit for transmission reading separately from the casing, and reads the transmitted light or the reflected light of the document by the reading unit. In an image reading device for forming an image on a light receiving surface of a sensor, a holding mechanism for receiving the light source unit for transmission reading in a casing, and a connection for mechanically and electrically connecting the light source unit for transmission reading with the reading unit. And a light source unit for illumination and a light source unit for transmission reading. Inverter power through the output of the inverter power source has a configuration that includes a light source unit or the light source unit switching deliverable source switcher to for transmission reading for the reflection reading.

According to a second aspect of the present invention, the light source unit for transmissive reading is provided with holders at both ends thereof, and one of the holders supports the power source connecting portion, and the top plate has a holder insertion port through which both holders can pass. It also has a slit-shaped escape portion for the holder extending from the holder insertion opening in the moving direction of the reading unit, and the reading unit can be fitted and connected to the power supply connection portion directly below the one holder insertion opening. The power supply connection unit is supported.

According to a third aspect of the present invention, the connecting mechanism includes a holder guide vertically provided in the casing, a holder receiving portion provided in the reading unit and located directly below the holder guide, and the holder. An elastically deformable protrusion is provided on the vertical surface of the receiving portion, and a fitting hole into which the protrusion can be fitted with one touch is formed in the lower end hanging portion of the holder. The configuration is as follows.

According to a fourth aspect of the present invention, the holding mechanism includes an elastically deformable protrusion provided on the vertical surface of the holder guide, and a fitting hole formed at the lower end of the lower end of the holder for one-touch fitting of the protrusion. And the transmission reading light source unit is mechanically and electrically held to the reading unit.

According to a fifth aspect of the present invention, the power supply connection unit of the reading unit has an interlock switch, and the power supply connection portion of the light source unit for transmissive reading has an engaging element engageable with a switch element of the switch. The switch is turned off when the power supply connection unit and the power supply connection portion are not fitted and coupled, and the light source unit switching device is locked to the reflection reading light source unit side.

In the present invention, the engaging element which can be engaged with the switch element is a horizontal step portion of the holder.

According to the seventh aspect, the interlock switch is provided in the power supply circuit on the plus side of the light source switching means.

According to an eighth aspect of the present invention, the document pressing cover placed on the transparent document table has a transmission light source unit storage section continuous with the cover body.

According to a ninth aspect of the present invention, the transmission light source unit storage portion of the document pressing cover is a semi-cylindrical body whose both ends are closed, and is configured to be relatively bendable and continuous with the hinge portion through the hinge portion.

According to a tenth aspect of the present invention, the reading sensor of the reading unit is a line sensor, and the transmitted light or the reflected light of the document is received through the converging rod lens array elongated in the line direction.

In the eleventh aspect, the converging rod lens array of the reading unit is supported by the frame of the reading unit via the fine adjustment mechanism of the position in the optical axis direction.

According to a twelfth aspect of the present invention, the fine adjustment mechanism for the position in the optical axis direction is slidably rotatably pierced through the ears extended respectively at both ends in the holder longitudinal direction of the converging rod lens array and screwed into the frame. A vertical adjustment screw and a coil spring interposed in the adjustment screw are provided, and the coil spring biases and presses the ear portion against the head of the adjustment screw.

In the thirteenth aspect, the reading unit has a structure for finely adjusting the position of the reading sensor in the line direction.

According to a fourteenth aspect of the present invention, in the fine adjustment mechanism for the position in the line direction, the eccentric shaft provided on the frame of the reading unit and the sensor holder of the reading sensor screwed to the frame are provided with an end portion of the eccentric shaft. It was configured to be a long hole in the line direction to be fitted.

[0021]

According to the present invention, the transmissive light source unit can be mechanically and electrically connected to the reading unit with the reading unit sandwiched between the reading unit and the reading unit. It can be moved integrally, and the optical path length of transmitted light is as short as the optical path length of reflected light. Further, at this time, the illumination power source is switched to the transmission light source unit side and the illumination power source is shared with the reflection light source unit, so that the cost of the illumination power source unit is low.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a casing of an image reading apparatus. As for a portion of the casing 1 below the top plate 2A, an upper portion thereof is a reading unit housing portion 3, and a lower portion thereof is a power supply / control device or the like. It is the storage part 4 of. F
And R indicate the front side and the rear side of the casing 1, respectively. A transparent glass table 5 serving as a document table is fitted in the top plate 2A, and two slit-shaped holder escape portions 6 extending in parallel to the front-rear direction (scanning direction) are formed at both end portions. There is. A holder insertion opening 7A is formed at a predetermined position on the rear end side of one (left side in the figure) holder release portion, and a holder insertion opening 7B (at the rear end portion of the other (right side in the figure) holder insertion opening 7B ( It is also a power supply connection slot). 8 is a power switch attached to the right side plate 2BR of the casing 1, 9 is a power connector attached to the rear plate 2D of the casing 1,
A lid 10 with a handle is detachably attached to the rear plate 2C. 2BL is the left side plate 2BR of the casing 1,
2C is a front plate of the casing 1. This power connector 9
Is connected to a commercial power source (not shown).

Reference numeral 20 denotes a transmissive light source unit, which houses a fluorescent lamp 22 in a rectangular unit case 21 as shown in FIGS. 4 and 7. 3, a plate-shaped holder 23 hangs down, and this holder 23 has a latch portion 23A that forms a stepped portion 23B and hangs down.
A lateral elongated hole 23a for latch is formed in 3A.
A plate-like holder 24 hangs from the lower surface of the right end of the unit case 21 as shown in an enlarged view in FIG. 3, and this holder 24 has a latch portion 24A which forms a step portion 24B and hangs. A lateral long hole 24 for latch is provided in the portion 24A.
a is formed. The holder 24 has a power plug 25
Has been attached. The stepped portion 2 of the holder 24
The lower surface of 4B is engaged with a lever 59A of an interlock switch (micro switch) 59 described later. 24B
25 to 25 constitute the power source connecting portion 26, and the power source connecting portion insertion port 7B has a hole shape through which the power source connecting portion 26 can pass in a sliding manner. 25A and 25B are connection pins. In FIG. 4, 68 is a diffusion plate, and 69B is a transparent original such as a positive film.

FIG. 2 schematically shows the inside of the reading unit housing portion 3 of the casing 1, the details of which are shown in FIGS. Reference numeral 30 is a box for partitioning the reading unit storage section 3. 31 is the front-back direction of the box 30 (the front frame 30C and the rear frame 30).
A slide shaft 32 extending in the D direction) and a guide shaft 32 extending in the front-rear direction of the box body 30 (directions of the front frame 30C and the rear frame 30D). The slide shaft 31 includes a slider provided on the lower surface of the reading unit 40. The portion 41 is fitted, and the slider 42 provided on the carriage 43 of the reading unit 40 is engaged with the guide shaft 32. 33 is a subordinate wheel 3 near the rear frame 30D
4 and a drive wheel 35 near the front frame 30C, which is an endless belt, and a lower portion of a carriage 43 of a reading unit 40 is connected to the endless belt 33. The drive wheel 35 is driven by the motor 36, and the pulley 35A and the endless belt 3
It is driven in the forward and reverse directions via 7.

The slider portion 41 supports a holder receiving member 44. The holder receiving member 44 extends horizontally through a slit 30a formed in the side frame 30A of the box 30 in the front-rear direction to extend horizontally. Slit 44 on the part protruding from
a supporting plate 4 having a and hanging from this slit 44a portion
4b is formed, and a half-cylindrical spring 45A for latching is attached to the surface of the support plate 44b. Reference numeral 46 denotes a holder receiving member attached to the carriage 43. The holder receiving member 46 freely penetrates the slit 30b formed in the side frame 30B of the box 30 in the front-rear direction, and the portion protruding from the box 30 hangs down in an L shape. , A latch spring 45A is attached to the surface thereof. Two
3, 24 and 44 to 46 form a connecting mechanism.

On the side frames 30A and 30B of the box 30, a holder guide 38 having a vertical guide space G is provided above the slits 30a and 30b and directly below the holder insertion ports 7A and 7B. 39 are attached to the respective holder guides, and half-cylindrical springs 45B for latching are provided on the surfaces of both holder guides. 38A and 39A are guide plates. The holder guides 38 and 39 and the spring 45B cooperate with the holders 23 and 24 to form a holding mechanism.

As shown in an enlarged view in FIG. 8, the reading unit 40 has a frame 47, and a plate-shaped sensor holder 49 having a line CCD sensor 48 mounted on the lower surface of the frame 47 is attached with a screw 50. A control board 53 is supported below the sensor holder 49 by screws 50 and 52 via a spacer 51. The frame 47 has, on its front side, a raised portion 47A that defines a space between the frame 47 and the upper surface of the sensor holder 49, and a tubular portion 47B that opens at the lower end to the raised portion 47A and extends upward. A converging rod lens array 54 is attached to 47B. The CCD sensor (line sensor) 48 is arranged directly below the converging rod lens array 54. Reference numeral 55 denotes a light source unit for reflection, which has a fluorescent lamp 56, is located behind the cylindrical portion 47B of the frame 47, and is supported by the carriage 43. Reference numeral 57 denotes a guide roll provided on the opposite side of the slide shaft 31 of the carriage 43,
It engages with the back surface of and rolls. 67 is a document pressing cover, 6
Reference numeral 9A indicates a reflection original (printed material). The document pressing cover 67 has a unit escape 67A for the light source unit 20 for transmission on the casing 1.

Reference numeral 58 denotes a power supply connector which is held by the holder receiving member 46 and into which a connection pin of the power supply plug 25 is inserted. A microswitch 59 for interlock is attached at a rear position separated by a predetermined distance from the power supply connector 58. Has been. 58A and 58B are power supply connectors 58
, 59A is a lever of the microswitch 59. Reference numerals 58 to 59 form a power supply connection unit.

When the reading unit 40 is located at the home position (shown in FIG. 2) HP, this power supply connecting unit vertically opposes the power supply connecting portion insertion port 7B.

The transmitted light source unit 20 is always held by the casing 1 by inserting the power source connecting portion 26 into the casing 1 from the power source connecting portion insertion port 7B and the left holder 23 into the holder escape portion 6. In this state, the power supply connection portion 26 is mounted on the power supply connection unit in a non-fitting state with the power supply connection unit.

FIG. 11 is a circuit diagram showing the illumination power supply unit housed in the housing section 4. In the figure,
Reference numeral 60 is an inverter power supply, 61 is a light source unit switcher to which a reflection / transmission mode switching command S is given, and 62 to 65 are relay switches, which are normally switched to the A contact side (reflection light source unit 50 side). There is. An interlock circuit 66 has a circuit configuration shown in FIG. 12, for example. In the figure, Tr is a transistor and Lf
Is a coil of the relay, and when the coil Lf is energized, the relay switches 65 to 68 are switched to the B contact side (transmission light source unit 20 side). D is a diode, r is a resistor, Vo is an output voltage (235 volts) of the inverter power supply, and Vc is a control voltage (24 volts).

Next, the operation of this embodiment will be described.

In the transmissive light source unit 20, the holders 23 and 24 are inserted into the casing 1 through the holder insertion ports 7A and 7B, respectively. Holder guide 38 in casing 1
And 39, the inserted holders 23 and 24 are guided by holder guides 38 and 39, respectively. When the holders 23 and 24 are guided to a certain position, the holder 23
When the lower ends of and 24 come into contact with the spring 45B and are compressed and flattened so as to flatten the spring 45B and descend to a predetermined position, the spring 45B is restored and deformed and fitted into the fitting holes 23a and 24a,
As shown in FIG. 10, the holders 23 and 24 are positioned and held.

When reading in the reflection mode, the transmissive light source unit 20 is brought into the non-fitting state shown in FIG. In this state, since the stepped portion 24A of the holder 24 of the power supply connecting portion 26 is separated from the lever 59A of the micro switch 59, the micro switch 59 is off. Therefore, even when the reflection / transmission mode switching command S arrives, the coil Lf is not energized, and the relay switches 62 to 65 are on the A contact side.

After this preparation is completed, as shown in FIG. 2, the reflection original 69A is placed on the glass table 5, the original pressing cover 67 is placed on the original 69A, and a reading start button (not shown) is pressed to reflect the light source unit 55 for reflection. The illumination power is supplied to the motor 36, the motor 36 rotates in the forward direction, the belt 33 is driven in the direction of the arrow in the figure, and the reading unit 40 moves from the home position HP in the direction of the arrow in the figure. At this time, the fluorescent lamp 56 of the light source unit for reflection 55 passes through the glass table 5 as shown by the broken line in FIG.
A is irradiated, and the reflected light passes through the converging rod lens 54 and forms an image on the CCD sensor 48.

When reading in the transmissive mode, the transmissive light source unit 20 is pushed down. When the transmissive light source unit 20 is pushed down, the holders 23 and 24 compress in a direction to flatten the spring 45B and slide down on the spring 45B, and the latch portion 23A of the holder 23 passes through the slit 44a. After that, the spring 45A comes into contact with the spring 45A, is compressed and flattened so as to be flattened, and is lowered to a predetermined position. Then, as shown in FIG. 9, the spring 45A is restored and deformed and fits into the fitting hole 23a. At this time, the stepped portion 23A becomes the holder receiving member 44.
Engage on. On the holder 24 side, the pins 25A and 25B of the power plug 25 are connected to the receptacle 5 of the power connector 58.
8A and 58B are fitted and electrically connected to each other, and the step portion 24A of the holder 24 is connected to the micro switch 59.
The lever 59A is engaged and pushed down, and the micro switch 59 is turned on.

Therefore, when the reflection / transmission mode switching command S is given, the coil Lf is energized and the relay switch 6
2 to 65 are switched to the B contact side (transmission light source unit 20 side).

After this preparation is completed, as shown in FIG. 4, the transparent original 69B is placed on the glass table 5, the original holding cover 67 is replaced with the diffuser plate 68 over the original 69B, and a reading start button (not shown) is pressed. And power for illumination is supplied to the light source unit for transmission 20 and the motor 3
6 rotates in the normal direction, the belt 33 is driven in the direction of the arrow in the figure,
The reading unit 40 moves from the home position HP in the direction of the arrow shown. The light source unit 20 for transmission is the holder 2
Since the third side is connected to the reading unit 40 via the spring 45A and the holder 24 side is in the connected state by the fitting of the power supply plug 25 and the power supply connector 58, the holder 24 side moves integrally with the reading unit 40. At this time, the holders 23 and 24 move inside the escape portion 6.

The fluorescent lamp 21 of the transmissive light source unit 20 passes through the transparent original 69B and the glass table 5 as shown by the broken line in FIG. 4, and this transmitted light passes through the converging rod lens 54 and onto the CCD sensor 48. Form an image.

As described above, in this embodiment, the optical path length of the transmitted light is the same as the optical path length of the reflected light, so that a good reading quality can be obtained even when reading the transparent original.

Further, since the inverter power source 60 for illumination is common to the reflection light source unit 55 and the transmission light source unit 20, the cost of the illumination power source unit is low.

Further, there is a switch 59 which is turned on when the power supply connection portion 26 of the light source unit for transmission 20 is fitted and connected to the power supply connection unit of the reading unit 40, and the switch 59 is ON and the transmission mode is set. Switch command S to
When the power is supplied to the transmissive light source unit 20, it is possible to supply power to the transmissive light source unit 20. Is not supplied with power,
Further, since this fitting and connection and the ON / OFF of the switch 59 are performed in the casing 1 and the reflection light source unit 55 is also in the casing 1, the operator operating the transmission light source unit 20 makes the fluorescent lamp of high pressure. There is no danger of electric shock due to the power supply voltage to

In the above embodiment, the document holding cover 6
7 is shown by a dotted line in FIG. 2 and is not specifically shown, an example of a document pressing cover 67 suitable for this apparatus is shown in FIGS. 13 and 14. The document pressing cover 67 shown here includes a cover body 67B, a transmissive light source unit storage section 67C, and a hem section 6.
7D and 7D are sequentially arranged and have a size that covers the entire upper surface of the casing 1. The transmissive light source unit storage portion 67C of the document pressing cover 67 is a semi-cylindrical body with both ends closed, and defines a transmissive light source unit storage space 67c inside, and a boundary portion with the cover body 67B and a boundary portion with the skirt portion 67D. 14 is a hinge portion 67E. As shown in FIG. 14, the transmissive light source unit storage portion 67C can be bent upward to a certain angle with respect to the skirt portion 67D, and the cover body 67B can be bent relative to the transmissive light source unit storage portion 67C. Can be bent upwards to a certain angle.

The original pressing cover 67 is provided in the non-fitted transmission light source unit 2 at the home position.
Since 0 can be stored in the transmissive light source unit storage 67C and placed on the document table 5, only the cover body 67B can be raised and lowered to replace the document when reading in the reflection mode.

Further, since the transmissive light source unit storing portion 67C of the document pressing cover 67 is a half cylinder closed at both ends, it is possible to give the apparatus a beautiful appearance.

By the way, if the convergent rod lens SL deviates from the normal position by ΔY as shown in FIG. 15 (A), the image transmission characteristic MTF sharply decreases as shown in FIG. 15 (B). As a result, the image is blurred, and if the optical axis of the SELFOX lens SL deviates from the center line of the CCD sensor by ΔX, unevenness of the light amount occurs as shown in FIG. 16 and the image quality deteriorates. Therefore, in order to obtain a good quality image, the converging rod lens array 54 and the CCD
Although it is necessary to accurately match the optical positional relationship with the sensor 48, the CCD sensor 48 has a line length equal to or larger than the document width (A4, A3 size), and the converging rod lens array 54 has a long length. Since this is an array, it takes a lot of time and labor to accurately match the optical positional relationship between the two, which is one of the causes of lowering the productivity of the apparatus and increasing the cost of the apparatus.

Therefore, the inventors of the present invention support the converging rod lens array 54 via an optical axis position fine adjustment mechanism as shown in FIG. 17, and the CCD sensor 48 makes fine adjustment of the line direction position as shown in FIG. The above problem has been solved by making it possible to adjust the position in the line direction by the adjusting mechanism.

In FIG. 17, reference numeral 541 is a holder for the converging rod lens array 54, and ears 543 having holes 542 as shown in FIG. 18 are extended at both longitudinal ends of the holder 541. Reference numeral 544 denotes an adjusting screw, which slidably penetrates the hole 542 of the ear portion 543 and is screwed and erected on the frame 47. 545 is a coil spring, which is interposed in the adjusting screw 544 and biases the ear portion 543 to the lower surface of the head portion 544A of the adjusting screw 544.

In this structure, when the adjusting screw 544 is rotated and screwed to the frame 47 side, the ear portion 543 is pushed down by the amount corresponding to the screw rotation amount against the elasticity of the coil spring 545 (-in FIG. 15). (y direction), the ear portion 543 is pushed up by the elastic force of the coil spring 545 (y direction in FIG. 15) when rotated in the opposite direction, so that the position of the converging lens array 54 in the optical axis direction can be finely and easily adjusted. Therefore, it is easy to obtain an image without image blur.

In FIG. 19, reference numeral 546 denotes an eccentric shaft having a shape shown in FIGS. 20 (A) and 20 (B),
A hole 547 formed in the frame 47 is slidably and rotatably passed through and extends to the sensor holder 49. Sensor holder 4
As shown in FIG. 21, there are two eccentric shaft fitting holes 54
8 is formed, and the lower end portion 546A of the eccentric shaft 546 is fitted into the eccentric shaft fitting hole 548. The eccentric shaft fitting hole 548 is a long hole extending in the line direction of the CCD sensor 48. The sensor holder 49 is fixed to the lower surface of the frame 47 by bolts 549 at its four corners. 20A is a side view of the eccentric shaft 546, and FIG. 20B is a view of the eccentric shaft 546 seen from the lower end.

In this configuration, when the four bolts 549 are loosened and the two eccentric shafts 546 are rotated rightward, for example, the sensor holder 49 is moved by a distance corresponding to the amount of rotation.
When the sensor holder 49 is rotated to the right (-x direction in FIG. 16) and vice versa, the sensor holder 49 is displaced left (x direction in FIG. 16) in FIG.
By finely adjusting the directional position, it is possible to easily eliminate the displacement of the converging lens array 54 shown in FIG. 16 in the x direction, and it becomes easy to obtain an image with no image unevenness.

Therefore, if the fine adjustment mechanism for the position in the line direction and the fine adjustment mechanism for the optical axis position are provided, the focal depth of the converging lens and the deviation from the center line can be independently corrected. Lens array 54 and C
The optical positional relationship with the CD sensor 48 can be easily adjusted accurately in a short time, and the productivity can be improved as compared with the conventional case.

[0054]

As described above, according to the present invention, the transmissive light source unit is provided so that the transmissive light source unit can be connected to the reading unit by sandwiching the original table between the reading unit and the reading unit so as to be movable integrally with the reading unit. As a result, the optical path length of the transmitted light at the time of reading the transparent original is shortened, so that the reading quality can be improved, and the reflective original can be read with the light source unit for transmission set.
In addition, since the illumination power source is common to the transmissive light source unit and the reflective light source unit, there is an advantage that the cost for the illumination power source can be low.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing the inside of the casing of the above embodiment.

FIG. 3 is a schematic vertical sectional view showing the inside of the casing of the above embodiment.

FIG. 4 is a side view showing a positional relationship between a transparent original unit and a reading unit in the above embodiment.

FIG. 5 is a partial plan view of the above embodiment.

FIG. 6 is a partial side sectional view of the above embodiment.

FIG. 7 is a partial side sectional view of a transmissive light source unit in the above embodiment.

FIG. 8 is a side view of the reading unit in the above embodiment.

FIG. 9 is a vertical cross-sectional view showing a set state of the transmissive light source unit in the above embodiment.

FIG. 10 is a vertical cross-sectional view showing a non-set state of the transmissive light source unit in the above embodiment.

FIG. 11 is a circuit diagram of a lighting power supply unit in the above embodiment.

FIG. 12 is a circuit diagram of an interlock circuit of the lighting power supply unit.

FIG. 13 is a perspective view showing an example of a document pressing cover in the above embodiment.

FIG. 15 is a diagram for explaining the depth of focus of a converging rod lens.

FIG. 16 is a diagram for explaining the influence of the deviation of the center line between the convergent rod lens and the line sensor.

FIG. 17 is a diagram showing an optical axis position fine adjustment mechanism of a converging rod lens array.

FIG. 18 shows a holder for a convergent rod lens array.

FIG. 19 is a view showing a fine adjustment mechanism for the position of the CCD sensor in the line direction.

FIG. 20 is a diagram showing an eccentric axis in FIG. 19.

FIG. 21 is a perspective view of the sensor holder in FIG.

FIG. 22 is a schematic configuration diagram for explaining a basic operation of the image reading device.

[Explanation of symbols]

 1 Casing 2 Top Plate 5 Document Plate 6 Escape Port 7A, 7B Holder Insert 20 Light Source Unit for Transmission 21 Fluorescent Lamp 23, 24 Holder 25 Power Plug 26 Power Connection 40 Reading Unit 43 Carriage 48 CCD Sensor 54 Convergent Rod Lens Array 55 Reflection light source unit 56 Fluorescent lamp 58 Connector 59 Micro switch 59A Switch lever 60 Inverter power supply 61 Light source selector 62-65 Relay switch 66 Interlock circuit 67 Original pressing cover 67A Unit escape 67B Cover body 67C Transmission light source unit storage Part 67D Bottom part 67e Hinge part 68 Diffusion plate 69A, 69B Document 541 Convergence rod lens array holder 542 Hole 543 Holder ear 544 Adjustment screw 545 Coil spring 546 Exe Shaft 547 hole 548 eccentric shaft fitting hole 549 volt Tr transistor Lf relay coil

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[Procedure amendment]

[Submission date] July 28, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing the inside of the casing of the above embodiment.

FIG. 3 is a schematic vertical sectional view showing the inside of the casing of the above embodiment.

FIG. 4 is a side view showing a positional relationship between a transparent original unit and a reading unit in the above embodiment.

FIG. 5 is a partial plan view of the above embodiment.

FIG. 6 is a partial side sectional view of the above embodiment.

FIG. 7 is a partial side sectional view of a transmissive light source unit in the above embodiment.

FIG. 8 is a side view of the reading unit in the above embodiment.

FIG. 9 is a vertical cross-sectional view showing a set state of the transmissive light source unit in the above embodiment.

FIG. 10 is a vertical cross-sectional view showing a non-set state of the transmissive light source unit in the above embodiment.

FIG. 11 is a circuit diagram of a lighting power supply unit in the above embodiment.

FIG. 12 is a circuit diagram of an interlock circuit of the lighting power supply unit.

FIG. 13 is a perspective view showing an example of a document pressing cover in the above embodiment.

FIG. 14 is a perspective view showing the external appearance of the above embodiment.

FIG. 15 is a diagram for explaining the depth of focus of a converging rod lens.

FIG. 16 is a diagram for explaining the influence of the deviation of the center line between the convergent rod lens and the line sensor.

FIG. 17 is a diagram showing an optical axis position fine adjustment mechanism of a converging rod lens array.

FIG. 18 shows a holder for a convergent rod lens array.

FIG. 19 is a view showing a fine adjustment mechanism for the position of the CCD sensor in the line direction.

FIG. 20 is a diagram showing an eccentric axis in FIG. 19.

FIG. 21 is a perspective view of the sensor holder in FIG.

FIG. 22 is a schematic configuration diagram for explaining a basic operation of the image reading device.

[Explanation of reference numerals] 1 casing 2 top plate 5 document table 6 escape section 7A, 7B holder insertion port 20 light source unit for transmission 21 fluorescent lamps 23, 24 holder 25 power plug 26 power connection section 40 reading unit 43 carriage 48 CCD sensor 54 Convergence rod lens array 55 Reflection light source unit 56 Fluorescent lamp 58 Connector 59 Micro switch 59A Switch lever 60 Inverter power supply 61 Light source selector 62-65 Relay switch 66 Interlock circuit 67 Original pressing cover 67A Unit escape 67B Cover body 67C Transmission light source unit storage section 67D Bottom section 67e Hinge section 68 Diffusion plate 69A, 69B Document 541 Convergence rod lens array holder 542 Hole 543 Holder ear 544 Adjustment screw 545 Coil bar 546 eccentric shaft 547 hole 548 eccentric shaft fitting hole 549 volts Tr transistor Lf relay coil

Claims (14)

[Claims] 1. A reading unit having a transparent platen on a top plate and having a light source unit for reflection reading therein, a drive mechanism for reciprocating the reading unit from a home position, and a power supply unit for illumination. In an image reading device that has a casing housed therein, has a light source unit for transmission reading separately from the casing, and forms an image of transmitted light or reflected light of an original on the light receiving surface of the reading sensor of the reading unit, And a holding mechanism for receiving the light source unit for transmissive reading, and a connecting mechanism capable of mechanically and electrically connecting the light source unit for transmissive reading with the reading unit, and the light source unit for light is the reflection unit. An inverter power supply common to the light source unit for reading and the light source unit for transmission reading and the output of this inverter power source. An image reading apparatus comprising a light source switching device capable of switching and supplying power to the light source unit for reflection reading or the light source unit for transmission reading. 2. A light source unit for transmissive reading is provided with holders at both ends thereof, and one of the holders supports a power source connecting portion, and the top plate has a holder insertion port through which both holders can pass. It has a slit-shaped escape portion for the holder extending from the insertion port in the moving direction of the reading unit, and the reading unit has a power supply connection unit that can be fitted and connected with the power supply connection part just below the one holder insertion port. The image reading apparatus according to claim 1, which is supported. 3. The connecting mechanism includes a holder guide vertically provided in the casing, a holder receiving portion provided in the reading unit and located directly below the holder guide, and a holder. An elastically deformable protrusion is provided on the vertical surface, and a fitting hole into which the protrusion can be fitted with one-touch is formed in the lower part of the lower end of the holder. The image reading apparatus according to claim 2, wherein 4. The one-touch holding mechanism comprises an elastically deformable protrusion provided on a vertical surface of a holder guide and a fitting hole formed in a lower portion of a lower end of the holder so that the protrusion can be fitted with one-touch. 3. The image reading device according to claim 1, wherein the holding mechanism holds the light source unit for transmissive reading in a mechanically and electrically non-connected manner with the reading unit. 5. The power supply connection unit of the reading unit has an interlock switch, and the power supply connection part of the light source unit for transmissive reading has an engaging element engageable with a switch element of the switch, and the switch has a power supply connection. 3. The image reading apparatus according to claim 1, wherein the image reading apparatus is turned off when the unit and the power source connecting portion are not engaged and connected, and the light source unit switching device is locked to the reflection reading light source unit side. 6. The image reading apparatus according to claim 5, wherein the engagement element engageable with the switch element is a horizontal step portion of the holder. 7. The image reading apparatus according to claim 1, wherein an interlock switch is provided in the power supply circuit on the plus side of the light source switching means. 8. The image reading apparatus according to claim 1, wherein the document pressing cover placed on the transparent document table has a transmission light source unit storage section continuous with the cover body. apparatus. 9. The transmission light source unit storage portion of the document pressing cover is a semi-cylindrical body whose both ends are closed, and is continuous with the cover body via a hinge portion so as to be bendable relative thereto. 8. The image reading device according to item 8. 10. The image according to claim 1, wherein the reading sensor of the reading unit is a line sensor, and the original transmitted light or the original reflected light is received through a converging rod lens array elongated in the line direction. Reader. 11. The image reading apparatus according to claim 10, wherein the converging rod lens array of the reading unit is supported by the frame of the reading unit via an optical axis position fine adjustment mechanism. 12. An optical axis direction fine adjustment mechanism is slidably rotatably pierced through an ear portion extended at each longitudinal end of a holder of a converging lodge lens array so as to be screwed and erected on a frame. 12. An adjusting screw and a coil spring interposed in the adjusting screw, the coil spring biasing and pressing the ear portion against the head of the adjusting screw. The image reading device described. 13. The image reading apparatus according to claim 1, wherein the reading unit has a line direction position fine adjustment mechanism of the reading sensor. 14. The line direction position fine adjustment mechanism is formed on an eccentric shaft provided on a frame of a reading unit and a sensor holder of a reading sensor screwed to the frame, and an end portion of the eccentric shaft is fitted to the eccentric shaft. 2. A long hole in the line direction.
3. The image reading device described in 3.