JPS62287253A - Optical path switching method for scanner scanning part - Google Patents

Abstract

PURPOSE:To easily switch scanning light guide paths for transmission originals without detaching a cylinder for original mounting by controlling the passage and interception of original illumination light traveling from a light source to the scanning light guide paths opening and closing shutters for light shielding. CONSTITUTION:Solenoids 13 and 14 are associated operatively with a switch which the kinds (transmission and reflection) of originals provided to the console panel 20 of a scanner, and the shutters 10 and 11 are so controlled as to cut off illumination light 21 and pass illumination light 22 when the switch is placed on the transmission side, but pass the illumination light 21 and cut off the illumination 22 when the switch is placed on the reflection side to the contrary. The scanning light guide paths are switched by this method to eliminate the need for troublesome operation wherein the cylinder for original mounting is detached and scanning lens and blanking cap of the scanning light guide paths for transmission original are replaced every time the kind of an original is changed.

Description

[Detailed description of the invention] 3. Detailed description of the light (industrial application field) The present invention provides a drum scanner for reading originals,
The present invention relates to a method for switching the path of a scanning light guide path for guiding illumination light on an original depending on whether the original is a transparent original or a reflective original.

(Prior art) Conventionally, a drum scanner for printing plate making (hereinafter simply referred to as a scanner) that uses the same light source for both transparent and reflective originals has a scanning light guide path for transparent originals and a reflection light guide path for irradiating light onto transparent originals. Both scanning light guide paths for reflective originals are provided to irradiate light onto the original, and it is necessary to switch between the above-mentioned guide paths depending on whether the original is a transparent original or a reflective original. There is. The above-mentioned taxiway switching will be explained using FIG. 2 j'a) and (b). When changing the original from the transparent original 5b to the reflective original 5a, in order to irradiate the original with light only from the outside of the original loading cylinder 3 via the reflective original scanning light guide path 7, first change the original loading cylinder 3. Remove the cylinder 3 from the scanner body, replace the scanning lens 9 provided at the tip of the scanning light guide path 2 for transparent originals with a planking cap 8,
Thereafter, reading is performed after attaching the original document mounting printer 3 to the main body of the scanner. ~
When changing the original from the reflective original 5a to the transparent original 5b, the operation opposite to the above is performed.

(Problems to be Solved by the Invention) According to the conventional method of switching the path of the scanning light guide path, since the scanning light guide path 2 for transparent originals is disposed inside the original mounting cylinder 3, Each time the scanning lens 9 and the blanking cap 8 are replaced, it is necessary to remove the document mounting cylinder 3, which poses a problem in that work efficiency is reduced.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for switching the path of a scanning light guide path according to the type of document (transmission/reflection) without causing a decrease in work efficiency.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a first shutter for blocking illumination light on the light source side of the scanning light guide path for transparent originals, and a first shutter for blocking illumination light on the light source side of the scanning light guide path for reflective originals. When reading and scanning a transparent original, the 10th shutter is opened and the second shutter is closed; when reading and scanning a reflective original, the 10th shutter is closed. The above object is achieved by closing the roller and opening the second seven rollers so that the path of the scanning light guide path can be changed without removing the original mounting cylinder.

(Function) If the route of the scanning light guide path is switched by the method according to the present invention,
There is no need to remove the original mounting cylinder and replace the scanning lens and blanking cap of the scanning light guide path for transparent originals every time the type of original (transmission/reflection) changes, improving work efficiency. It has the effect of being able to achieve this.

(Example) The method according to the present invention will be described in more detail based on an example (example) illustrating the method according to the present invention.

Figure 1 shows an example of the appearance of the document scanning unit (7) of the scanner, where 1 is a light receiving section for reading the density information of the document, and 2 is a scanning light guide for transparent documents to guide illumination light to the transparent document. 3 is a cylinder for mounting the document; 4 is a lamp house in which a light source lamp for generating document illumination light and a scanning light switching shutter according to the present invention are housed;
20 indicates an operation panel.

Figures 3(a) and 3(b) show the lamp house 4 shown in Figure 1.
This is a schematic diagram for explaining the internal configuration and the relationship among K, the scanning light guide path 2 for transparent originals, the original mounting cylinder 3, the original (5a or 5b), and the light receiving section 1. Reference numeral 6 indicates a light source lamp, and 7 is a light guide path for reflective originals using optical fibers,
12a is a mirror for reflecting light in the direction of the scanning light guide path 7 for reflective originals; 12b is a scanning light guide path 2 for transparent originals;
10 is a shutter for blocking the illumination light 21 that enters the scanning light guide path 7 for reflective originals; 11 is the illumination light 22 that enters the scanning light guide path 2 for transparent originals; Shows 7 guys to block. FIG. 3(a) is an explanatory diagram when reading and scanning a reflective original 5a, and FIG. 3tb) is an explanatory diagram when reading and scanning a transparent original 5b.

The operation details of the present invention will now be explained. First, the case of reading and scanning the reflective original 5a will be explained.
As shown in FIG. 3(a), the shutter 10 is opened to allow the illumination light 21 to enter the reflective original scanning light guide path, and the shutter 11 is closed to block the illumination light 22, thereby guiding the reflective original scanning light. Illumination light is irradiated onto the reflective original 5a only from the outside of the original mounting roller 3 via the path 7. Next, to explain the case of reading and scanning the transparent original 5b, as shown in FIG. By blocking the illumination light 21, the illumination light is irradiated onto the transparent original 5b only from inside the original mounting printer 3 via the transparent original scanning light guiding path 2.

FIG. 4 is a perspective view showing an example of an optical path switching mechanism implementing the method of the present invention, and FIG. 5 is a top view of FIG. 4. In FIGS. 4 and 5, 13 is a solenoid that controls opening and closing of the shutter 10 for blocking illumination light 21 for reflective originals, and 14 is a solenoid that opens and closes the shutter 11 for blocking illumination light 22 for transparent originals. Shows the solenoid that performs control. To explain its operation, the solenoid 13 and the solenoid 14 described above are connected to the type of document provided on the operation panel 20 (FIG. 1) of the scanner.
When the switch is set to transmit, the illumination light 21 is blocked and the illumination light 22 is allowed to pass, and when the switch is set to reflect, the illumination light 21 is passed. At the same time, the shutters 10 and 11 are controlled to block the illumination light 22.

The above-mentioned shutter is connected to a solenoid having a rotating shaft, has a degree of freedom in the direction M in FIG. 4, and has a mechanism that operates according to the control current supplied to the solenoid. The shutter is not limited to a mechanism that operates, but may be a mechanism in which, for example, a shutter having a handle is provided on the lamp house 4 and the handle is manually operated from outside the lamp house 4.

Further, the shape of the shutter described above is not limited to a single plate as shown in this embodiment, but may include a plurality of overlapping shutter plates or a circular plate with an opening. Good too.

Furthermore, in this embodiment, the shutter 11 is provided at the entrance of the scanning light guide path 2 for transparent originals, but the shutter 11
The position may be anywhere on the optical path from the mirror 12b to the entrance of the scanning lens 9.

〔Effect of the invention〕

According to the present invention, by opening and closing the light shielding shutter,
By controlling the passage and blocking of the original illumination light from the light source to the scanning light guide path for transparent originals, the original loading cylinder is activated every time the original changes from a transparent original to a reflective original, or from a reflective original to a transparent original. The route of the scanning light guide path can be easily changed without being removed, which has the effect of improving work efficiency.

Further, according to the present invention, it is only necessary to provide a light-shielding shutter in the middle of the optical path for illuminating the transparent original, and even if a current scanner is modified, only a minor modification is required.
It also has the effect of being economical.

[Brief explanation of drawings]

Fig. 1 is an external view of a document scanning unit of a scanner that implements the method according to the present invention, Fig. 2 (al) is a schematic diagram for explaining the conventional optical path switching method, and Fig. 3 (a) (
bl is a schematic diagram for explaining the optical path switching method according to the present invention, FIG. 4 is a perspective view of the optical path switching mechanism showing an embodiment of the method according to the present invention, and FIG. 5 is the optical path switching shown in FIG. 4. FIG. 3 is a top view of the mechanism. 1...... Light receiving section

Claims (1)

[Claims] When switching the path of the document illumination light in the document scanning section of the printing plate-making drum scanner, if the document in the scanning section is a transparent document, the illumination light is irradiated onto the document via the transparent document scanning light guide path. When the original in the scanning unit is a reflective original, a switching shutter is provided on the light source side of the scanning light guide path to illuminate the original so that the illumination light is irradiated onto the original through the reflective original scanning light guide path. A method for switching the optical path of a scanner scanning unit, characterized by switching the optical path.