JPH0385867A - Transparent original reader - Google Patents

Abstract

PURPOSE:To read a transparent original with simple structure by supporting a lamp unit with a transparent original lamp mounted thereon with a carrier and driving the unit with the carrier integrally. CONSTITUTION:A lamp unit 9 is placed above an original platen 2, a lamp 11 of the lamp unit 9 is lighted to drive a carrier 4. Since the lamp unit 9 is supported with the carrier 4 at a bracket 22, the lamp unit is driven together with the carrier 4, the transparent original is lighted from upper part and the transmission light is led to an image sensor with the carrier 4. When a reflection original is read, the lamp unit 9 is removed to light the original with other lamp 12 provided to the carrier 4 or the lamp unit 9 is reversed and contained in the carrier 4, the lamp 11 of the lamp unit lights the reflection original and the image is read by driving the carrier 4. Thus, the transparent original is simply read.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a flatbed type document reading device that reads a document placed on a document table as image information, and particularly relates to a structure for reading a transparent document. The present invention relates to a unique document reading device.

(Prior Art) A document read by a document reading device is normally a reflective document using opaque paper as a medium, but it is often necessary to read a transparent document such as a plate-making film for printing.

FIG. 11 is a cross-sectional view schematically showing a conventional flatbed type document reading device that can read both reflective and transparent documents. 3 is a document holder. Housing 1
Inside, a carrier 4 that travels along the lower surface of the document table 2 guided by a guide (not shown), an imaging lens 5, an image sensor 6, and a travel drive device 7 for the carrier 4 are housed. On the other hand, inside the document holder 3, a lamp unit 9 and its traveling drive device 10 are housed, which are guided by a guide 8 and run in the same direction as the carrier 4 along the upper surface of the document table 2. Lamp (1) is installed.When reading reflective originals, carrier 4
The document is illuminated by the reflective document lamp 12, and the reflected light is imaged on the image sensor 6 through the imaging lens 5 and read. On the other hand, when reading a transparent original, the lamp unit 9 and the carrier 4 are run synchronously with the lamp 11 for transparent originals of the lamp unit 9 facing the carrier 4, and the original is illuminated by the lamp 11 for transparent originals, and the transmitted light is emitted. is imaged on the image sensor 6 by the imaging lens 5 and read. The synchronized running of the lamp unit 9 and the carrier 4 is usually performed by electrically driving the motor 13 of the lamp unit driving device 10 and the motor 14 of the carrier driving device 7, which are provided independently.

(Problem to be Solved by the Invention) However, in the device having the above structure, the lamp unit 9, the guide 8, and its traveling drive device to must be provided on the document holder 3, and the synchronization control device for the lamp unit 9 and the carrier 4 must be provided. This method has the disadvantage that it becomes complicated, and the entire device becomes large and expensive. Further, since the thickness and weight of the document holder 3 are increased, there is a problem in that the workability when opening and closing the document holder is deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flatbed type document reading device that can more easily read a transparent document.

(Means for Solving the Problems) In the present invention, the lamp unit 9 on which the transparent document lamp 11 is mounted is supported by the carrier 4, and the carrier 4. ! The above problem is solved by making the two run together.

The lamp unit 9 is attached to the carrier 4 by plate-shaped brackets 22 extending downward from both ends of the lamp unit. The housing i is provided with slits 21 in the traveling direction of the carrier 4 on both sides of the document table 2 in order to ensure the running of the bracket 22 extending from inside the housing onto the housing. The lamp unit 9 includes a cover 23 that covers the top of the mounted lamp 11. The lamp unit 9 is necessary only when reading a transparent original, so when reading a reflective original, the lamp unit 9 can be removed, or the lamp unit 9 can be inverted and housed in the carrier 4, and the lamp 11 of the lamp unit can be removed. The structure is such that it is shared as a reflective document lamp. The lamp unit 9 is attached to its bracket 2
By inserting and supporting the lower end of the lamp unit 2 into the insertion hole 35 of the support block 34 provided on the carrier 4, it is possible to remove the lamp unit 9 by pulling it upward. Also, attach the bracket 22 to the upper bracket 2.
By dividing the lamp unit 2 into a lower bracket 42 and pivotally connecting them with a pin 43 parallel to the lamp 9, the lamp unit 9 is rotated upward to be positioned on the upper surface of the document table 2, and rotated downward. It can be structured to be housed within the carrier 4.

In this case, in order to hold the lamp unit 9 in the upwardly moved position and the downwardly rotated position, the strike member 45 that restricts the range of rotation of the lamp unit around the pin 43 is used.
．． 46 and lamp unit 9 around the pin 43.
5. A detent spring 48 is provided that selectively biases toward either one of the four sides. Rotation of the lamp unit 9 around the pin 43 is performed when the carrier 4 reaches a position further retracted from the home position, and an opening 19 is provided on the upper surface of the housing in this area to allow the lamp unit 9 to pass through. .

(Function) When reading a transparent original with the apparatus configured as described above, the lamp unit 9 is positioned above the original platen 2, and the lamp 11 of the lamp unit 9 is turned off to cause the carrier 4 to travel. Since the lamp unit 9 is supported by the carrier 4 by the bracket 22, it travels together with the carrier 4 and illuminates the transparent original from above, and the transmitted light is guided by the carrier 4 to the image sensor 6. When reading a reflective original, either remove the lamp unit 9 and illuminate the original with another lamp 12 provided on the carrier 4, or turn the lamp unit 9 upside down and store it in the carrier 4, and use the lamp 11 of the lamp unit to illuminate the original. Illuminate it, run the carrier 4, and read it.

(Embodiment) FIGS. 1 to 3 show the first embodiment of the present invention. In FIG. The slits 9 are provided in parallel on both sides, and the brackets 22 (9) pass through the slits 21.
This is a lamp unit supported at both ends of the first element (Fig. 3).

FIG. 2 is a perspective view of the carrier 4 installed in the housing 1. The carrier 4 is inserted into and removed from the carrier frame 3L, which has a U-shaped cross section and is guided by a guide 15 fixed to the housing 1, in the longitudinal direction along the bottom surface of the carrier frame 3L. A slide plate 32 is attached, and a reflective document illumination lamp 12 is loaded into a socket 33 fixed to the slide plate. Further outside the socket 33, a support block 34 fixed to the slide plate 32 is provided, and an insertion port 35 is opened in the upper surface of this support block. Slide the reflective document lamp 12 onto the slide plate 32.
The reason for this is that when replacing the lamp, the slide plate 32 can be pulled out from the side opening window 16 (FIG. 1) of the housing 1 and the lamp 12 can be replaced.

FIG. 3 shows the lamp unit 9 with its cover 23 cut away. The lamp unit 9 is loaded with the transparent original lamp 11 through a socket 24, and a bracket 22 is fixed to the outer side of the socket 24 and extends downward. The power source for the lamp 11 for transparent originals is provided by manufacturing the bracket 22 from an insulating plate, forming a printed pattern 25 on its surface, and providing a contact point in contact with the printed pattern 25 in the insertion opening 35 of the carrier. , can be supplied from the carrier 4 side. On the other hand, the carrier 4 is provided with a limit switch (not shown) for detecting insertion of the bracket 22 into the insertion date 35,
The light source of the reflective original lamp 12 is cut off when the lift switch is turned on.

When reading a transparent original with the apparatus configured as described above, the lamp unit 9 is inserted into the insertion port 35 of the carrier 4 with its bracket 22 passing through the slit 21, and the original is placed on the original table 2, as shown in FIG. In this state, the carrier 4 is run and read. On the other hand, when reading a reflective original, pull out the lamp unit 9 upward and remove it, attach the original cover (not shown) to the hole in the original cover hook shown by reference numeral 17 in FIG. The carrier 4 is run and read in the covered state. A document cover is not provided when scanning a transparent document, but
Since the light from the lamp unit 9 is directed downward,
The light from the lamp unit 9 is not emitted upward, and the transparent original is usually made of a synthetic resin film with some degree of rigidity, so it can be held in close contact with the original table 2 even without a document holder. I can do it.

FIGS. 4 and 5 show a second embodiment of the invention. In this second embodiment, only the support plate 734 is attached to the slide plate 32 of the carrier 4, and no reflective document lamp is provided. The bracket 22 of the lamp unit 9 is attached to a 180-degree bend with four hinges. When reading a reflective original, the bracket 22 of the lamp unit 9 is
is inserted into the insertion opening 35 of the carrier through the slit 21 provided in the housing l, and the lamp unit 9 is supported at a position above the document table 2. On the other hand, when reading reflective originals,
Pull out the lamp unit 9 from the condition shown in FIG. Insert
In this state, the slide plate 32 is inserted into the carrier frame 31. Then, as shown in FIG.
is stored in the carrier 4 with its open portion facing upward. In this state, the lamp 11 travels along the lower surface of the document table 2 due to the travel of the carrier 4.
1 can illuminate a reflective original.

6 to 10 show a third embodiment of the present invention, in which the bracket supporting the lamp unit 9 is divided into an upper bracket 22 and a lower bracket 42, and the upper bracket 22 is integrated with the lamp unit 9. The lower bracket 42 is integrated with the carrier 4, and the upper and lower brackets 22
．． The ends of the lamp unit 42 are pivotally connected to each other by a pin 43 parallel to the lamp 11, and the transparent original is read while the lamp unit 9 is rotated upward around the pin 43, and then rotated toward the carrier 4. The reflective original is read in this state. In the lamp unit 9, the stopper piece 44 protruding from the end of the upper bracket 22 comes into contact with the shoulder 45, 46 of the lower bracket 42, so that the pin 4
Three rotations are restricted. and stopper piece 44
A hook 47 is installed at the tip of the carrier 4 and at the bottom of the end plate of the carrier 4.
A tension spring 48 is provided between the stopper piece 44 and the other shoulder 4 due to the detent action of the spring.
6 (FIG. 8). As shown in FIG. 9, the document table 2 is held slightly lower than the top plate 18 of the surrounding housing, so the pin 43 that pivots the upper and lower brackets is attached to the top plate 18. Located at the bottom, the upper bracket 22 passes through the slit 21 portion. A slit 27 is provided on the top surface 26 of the cover 23 of the lamp unit 9, through which the reading light passes when the lamp unit 9 is rotated toward the carrier 4 in the state shown in FIG. A shielding plate 28 is provided within the cover 23 to prevent radiation from being directly emitted from the slit 27. The lamp unit 9 rotates around the pin 43 when the carrier 4 reaches a position further retreated from its home position. In this position, as shown in FIG.
An opening 19 for moving the lamp unit 9 to the top plate of the
A stopper 49 as shown in FIG. 8 is provided at this portion, fixed to an immovable member within the housing. And the eighth lamp unit 9 is rotated toward the carrier 4 side.
In the state shown in the figure, the carrier 4 is further retreated from its home position, the lamp unit 9 is pushed by the stopper 49, and the lamp unit 9 is rotated about the pin 43. At a position beyond the rotational neutral point, the tension spring 48 The lamp unit 9 is rotated to the upper position shown in FIG. 7 by further rotating the lamp unit 9. When the lamp unit 9 is in the upper position shown in FIG. 7, the lamp unit 9 is moved to the home position, and the operator presses the position shown by the arrow in FIG. 7 with a finger to rotate it to the state shown in FIG. In this way, the lamp unit 9 can be switched between the state where it is located above the document table 2 and the state where it is located on the carrier 4 side, so the carrier 4 is run with the lamp unit 9 located above. This makes it possible to read a transparent original, and by moving the carrier 4 with the lamp unit 9 positioned on the carrier 4 side, it becomes possible to read a reflective original.

(Effects of the Invention) According to the structure of this invention explained above, it is possible to read a transparent original with an extremely simple structure in a flatbed type original reading device, and the device can be made very compact. In addition, it does not interfere with the operation of holding down the document when reading the reflective document.

[Brief explanation of drawings]

1 to 3 show a first embodiment of the present invention, and FIG. 1 is a perspective view of the entire apparatus when reading a transparent original;
FIG. 2 is a perspective view of the carrier, and FIG. 3 is a partially cutaway perspective view of the lamp unit throat. 4 and 5 are diagrams showing a second embodiment of the present invention. FIG. 4 is a perspective view showing the relationship between the carrier and the lamp unit when reading a transparent original, and FIG. 5 is a perspective view when reading a reflective original. FIG. 3 is a perspective view showing the relationship between a carrier and a lamp unit. 6 to 10 are diagrams showing a third embodiment of the present invention, in which FIG. 6 is a perspective view showing a connecting portion between a lamp unit and a carrier, FIG. 7 is a cross-sectional view when reading a transparent original, and FIG. The figure is a cross-sectional view when reading a reflective original, FIG. 9 is a side view when reading a transparent original, and FIG. 10 is a perspective view of the housing. FIG. 11 is a sectional view showing a conventional similar device. In the figure, 1: Housing 2: Original table 4: Carrier 9: Lamp unit 19: Opening 22 Nib bracket 34: Support block 4: Hinge 43: Pin 45.468 Stopper 6: Image sensor 11: Transparent original lamp 21 Nislit 23 : Cover 35: Inlet 42: Lower bracket 44: Strap piece 48: Tension spring

Claims (4)

[Claims] (1) Document table (2) made of a transparent plate on the top of the housing (1)
In the document reading device, which is equipped with a one-dimensional image sensor (6) and a carrier (4) that runs along the lower surface of the document table in a housing (1), the document table is located on the top surface of the housing (1). A lamp unit (9) is provided with a slit (21) in the running direction of the carrier (4) on both sides of the lamp unit (2), and is supported above the document table (2) by a bracket (22) that passes through the slit. is provided, the bracket is connected to a carrier (4), and the lamp unit (9) runs along the upper surface of the document table (2) integrally with the carrier (4). Flatbed type transparent document reading device. (2) The bracket (22) has its lower end connected to the carrier (
Claim 1, wherein the lamp unit (9) is inserted into and connected to the insertion port (35) provided in the lamp unit (4), and the lamp unit (9) is removable.
Transparent manuscript reading device described. (3) The carrier (4) can accommodate the lamp unit (9), and when reading reflective documents, the lamp unit (9)
3. The transparent document reading device according to claim 2, wherein the document is inverted and stored in the carrier (4), and the document is illuminated from the carrier (4) side with a lamp (11) of the lamp unit. (4) The bracket (22) is rotatably connected around a pin (43) parallel to the longitudinal direction of the lamp unit, and the stopper (45) restricts the rotation range of the lamp unit (9) around the pin. , 46) and a detent spring (48) that holds the lamp unit (9) in a position in contact with the stopper (45, 46). The lamp unit is rotated to the rotation end and held above the document table (2), and when reading a reflective document, the lamp unit is rotated to the other rotation end and held below the document table (2). The transparent original reading device according to claim 1.