JPS605665A - Picture scanning reader - Google Patents

Abstract

PURPOSE:To attain accurate reading by blocking the irradiation of excitation light at the blanking line scanning on a storage fluorescent sheet at a beam focusing position so as to eliminate the reduction in picture information. CONSTITUTION:Beam expanders 9a, 9b focusing a light beam to a point on an optical path are provided on the optical path of a light beam 4 for scanning. A rotary light shielding means 10 blocking the laser beam during the blanking scanning period in synchronizing with the reciprocating main scanning of a galvanometer mirror 6 is arranged at the focusing position by the beam expanders 9a, 9b. The beam whose beam diameter is spreaded by the beam expanders 9a, 9b is converged onto the fluorescent sheet 3 by an image forming lens 11. When a light beam is irradiated on the sheet 3, its part shows luminous luminance. This light is collected by a totally reflecting light guide plate 7 and detected, then a picture signal is obtained.

Description

[Detailed Description of the Invention] The excitation light is scanned two-dimensionally on the phosphor sheet to remove the image and debris using the Φ device Q, which erases the return path of the reciprocating main scan. ◇This article relates directly to an image scanning production device.

Radiation and insertion into certain fluorophores (Xii urine, α win, β + li
'li p r), urine, ultraviolet rays, etc.) When the total irradiation is performed, one ijlj of this radiation energy is accumulated in the phosphor,
It is known that when this phosphor is irradiated with excited light such as visible light, the phosphor emits photostimulant light in response to the emitted energy. The phosphor that shows seeds is called a phosphor that stores and absorbs light.

(hereinafter referred to as "fluorescent sheet")
・simply means "sheet". ), this stimulable phosphor sheet is scanned with excitation light such as a laser beam to generate a stimulated luminescent light, and the resulting stimulated luminescent light r is photoelectrically emitted to produce a single electroluminescent signal. k T4j sBased on this one hoe signal, the recording material of the old photographic photosensitive material ticket, CRT, etc., is output as a visible image and the sentence pardon/punishment line drawing '1 original record, mine 1 status collection system or not +
): proposed by 11 people at the age of 7). (Special 1) No. 5-12429, No. 5-6-1139
No. 5 etc. ) This radiation, 1 leak IL! ! In the image recording and scanning system, the gold-side laser beam reader stores the laser beam 'J-k as excitation light and captures the bonded phosphor sheet soil.
Next month, a method will be developed in which the stimulated luminescence light emitted at that time is detected in time series with a photoelectric detector such as the 7th circle, and an image signal is obtained. This two-dimensional scanning is performed by performing main scanning and Ii111 scanning with the excitation light on the sheet, but for this purpose, generally the sheet 2 is moved in one direction and one sub-scanning is performed, and the sheet is The entire main scan is performed by moving the excitation light back and forth in a direction perpendicular to the direction of movement.

A commonly used means for performing the entire main scan is a galvanometer mirror that moves back and forth along a fixed trajectory at a fixed speed. The scanning lines drawn on the light sheet by this main scanning means are stored at a constant angle with respect to the direction perpendicular to the sub-scanning direction because the sub-scanning is performed continuously (C) at a constant speed. There is a broken line shape (pine pear shape)
It is shaped like this. In this case, since the diameter of the light beam is a certain size, the scanning lines overlap when scanning is switched from forward scanning to backward scanning or vice versa. Special (If you are trying to improve the city cleanliness by increasing the C scanning line density,
Since each scanning line of the reciprocating movement is carried out in close proximity to each other, it is often necessary to cut out the scanning and tM molds.The stimulable phosphor sheet is once irradiated with excitation light, When the emitted light is emitted, the accumulated waste is reduced, so when the above-mentioned run-off occurs, the actual he-retrieval scanning process is reduced. 7 [Excluding U, there is overlap, and in the ΦLIIS portion, 10C of image 1 floor information has already been seen and decreased due to the 1st country light irradiation at the previous Kyurin Sougo.
There was a problem in that when the next constant strain ωC was taken, the area outside the 47 (f7) image '1h was not read.

The present invention has been made in view of the above-mentioned circumstances, and is a one-page reduced meal reading device that can accurately read the Katazuka report by eliminating the reduction in image information caused by the duplication of one set meal. Provided by Φ
This is the purpose Φ.

The uninvented one-stroke scanning reader uses a light beam on the optical path of the scanning light beam? A focusing means is provided to focus the optical beam at a point on the optical path, and at a focusing position of 16, the original beam is focused at a point in the main scanning direction.
The main feature is that it is equipped with a light shielding means to prevent the passage of the C-beam.

The uninvented focusing means may be, for example, other than a pair of rotary reciprocating devices, a rotating device, or a device that reciprocates toward the target; It may be of any kind as long as it can move the shell light section and IA in synchronization with the reciprocating main meal and block the passage of the light beam 4f during the homing scan 1171.

According to the uninvented thumb scissor scanning rack retrieval device, there is a light shielding device which moves in synchronization with the reciprocating scanning of the main scanning means of this device and prevents the passage of a light beam between the ribs of the scanning section. It is installed at the focal point of the gold light beam, and thereby prevents the irradiation of the light beam during retrace scanning onto the accumulative phosphor sheet.Information accumulated on the accumulative phosphor sheet soil Since the amount is not reduced by the return scan, it is possible to escape from the positive ☆f stroke 1 body' shoulder method. In addition, since the light beam is blocked at a position where the beam diameter is small, the displacement of the light linking member of the light blocking means required for blocking light may be minute, and the size of the light blocking part is also small. -Kotoka dekiri. Therefore, the rotational movement or reciprocating movement of the drive section of this light shielding means can be made high speed, and therefore it is possible to cope with high-speed reading scanning.

Hereinafter, embodiments of the invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of an image scanning and reading device according to the invention.
: This is a schematic diagram. Figure 1 shows a pair of rollers la
A magnetic layer 2af is laminated on the surface of the endless belt 2, which is drivably suspended around the endless belt 2, lb, and a phosphor sheet 3'l is adhered to the surface of the endless belt 2a and lb. The rotation of the phosphor sheet 3 causes the light beam 4 to move in the moving direction A) of the endless belt 2 through the laser light source 5 and the buff notator 6.
Sheet 3 is scanned and irradiated in the direction perpendicular to (arrow B)
This is an example of moving soil in two dimensions with light beam 4 Φ.

That is, the pair of rollers la and lb and the endless belt 6 perform the main scanning in the direction B perpendicular to the sub-scanning.

The endless belt 2 consists of a flexible/l/na endless belt-shaped support 2b (7) and a magnetic layer 2a (
It is made by laminating Z layers.

Beam expanders 9a and 9b consisting of two convex lenses and serving as beam focusing means are provided on the optical path between the beam expanders 9a and 9b. has been done.

The purpose of expanding the beam diameter with the beam expanders 9a and 9bK is to make the final 1-like light spot smaller, and the laser beam whose beam diameter has been expanded with the beam expanders 9a and 9b forms an image. The light is focused onto the phosphor sheet 3 by a lens 11.

Further, the sheet 3 includes a magnetic layer 3a and a stimulable fluorescent material tm3.
The stimulable phosphor layer 3b records the radiation transmitted through the subject (a)/, g';. A light beam 4 is irradiated onto this sheet 3, and the irradiated portion Φ exhibits all stimulated luminescence, and this stimulated luminescence yC is focused by a total reflection light guide plate 7 made of, for example, an acrylic plate. is detected by a photoelectric detector 8 such as Photomaru, and 1
1. , U image signals are present. The picture 1 image signal becomes a time-series image signal according to the two-dimensional stirrup.
Used for processing and reproducing wood. , FIG. 2 shows the rotating beam advancing means 10 and beam expander 9a shown in FIG.
, 9b is an enlarged 1-woman-cho-shuog+'6- figure.

The laser beam incident on the second lens 91 of the beam expander is once focused and then turned into a laser beam with an expanded beam diameter by the second lens 91). The sector 10a is rotated by a rotary motor 10bK at the same time as this beam. According to a tie that blocks the laser beam only during this period, sector-1
Since the sector 10a is located at the 0a pregnant beam fruit bundle position, the sector 10a can be made small.Furthermore, since the sector 10a'tl only needs to be rotated in one direction by the U-rotation motor 10b, the galvanometer h can be easily adjusted. Compatible with high-speed scanning and can be sharpened. It is more preferable to use the Cef%-10a in the form of a disc 1011 as shown in FIG. 2A so as not to generate wind noise during rotation. This disk 101 is made of a plain glass or acrylic plate, and a part thereof is coated with a light shielding material so as to completely block the laser beam during the retrace scanning period. In this example, the backlight part and 71 light points are arranged on this disk 1011 at approximately 90 degrees 8 degrees, and the synchronization signal of 6 galvanometers is used to
The timing is set such that the backlight section blocks the passage of the laser beam only during the return scanning period +=J.

In addition, in this example, the backlight part and the light transmission part are arranged in a binary arrangement every 90', but depending on your safety, you can change the angle ratio of the backlight part and the light transmission part or the light shielding as a pair of IS and light transmission i15. You can increase or decrease the number of people.

FIG. 38 is a perspective view showing another example of the continuous light means for the one-stop page and take-up device according to the present invention, and FIG. 3B shows the state when this light shielding means is placed on the optical path. This is a picture showing a bad pregnancy.

In this example, the tip of the rotating shaft 10d of the galvanometer 10c, which is substantially perpendicular to the laser beam,
It is designed to rotate reciprocatingly. In addition,
This light shielding member 10c extends so as to extend across the surface of the light shielding material on the cylinder. 1'1'11, IS full form l was cut out, and at the same time as the previous example, the beam bundle position 114 in the beam expander was set to 114. (Trace the groove pipe b of 10c)
As mentioned above, it is also necessary to produce ゛7. +f 1tJJ
In the middle of the day, move the triode light shield 10c back and forth so that both sides of the 1++llj layer in the city block all the laser beams. In this example, since the light shielding part 10c'i is provided with a light converging part (C), the light shielding part 10c can be made smaller in the shape of 1A.
In addition, the two side walls iβ of the groove portion allow the entire laser beam to be separated by 1” (all on one side).
Laser beam at a smaller rotation angle than in the case of using the wall aIIi FIG. 4 is a schematic diagram 1) 16 showing a third example of the light shielding means of the image scanning/reading device according to the present invention.

(7) (91J is a side light ``j'' consisting of a plate-shaped beam approximately perpendicular to the laser beam, +2.iQ) at the beam focusing position I11 in the beam expander.
A solenoid 10g is provided below the black light 1itl h' 10f, and this solenoid 10g is used to scan the galvanic mirror ν in the same manner.
The lof is moved up and down. That is, during the reading scan IHJ, the beam is located below the deceptive light aiiiΔ10fdK laser beam and is made to pass therethrough, and during the retrace scan JνJ, the light shielding member 10f is made to aim at the laser beam 1. Move it up and down. According to this example, the light shielding db material 10f is arranged in the light focusing group,
This light shielding member 1. Since it does not require a small mirror due to the movable distance of Of, it can correspond to the high speed 7th direction of galvanometries.

As explained in detail above, according to the invention, the auxiliary light illumination during the return trip onto the stimulable phosphor sheet is prevented by the light shielding means at the beam focusing position. '11 accumulated/lp on the top soil of the stimulable phosphor sheet
W′ of the image information whose information amount is not reduced by the back scan and is positive 4jQ? In addition to being able to carry out reading operations, it is also possible to handle high-speed reading scans 1f.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the image set meal reading device according to the invention; FIG. 2 is an enlarged view of the beam expanding area in FIG. 1; Figures 3A and 3B are a F view showing another example of the JL 51c means, a Akatsuki 1 diagram, and Figure 4 is a schematic diagram showing yet another example of the light shielding means. . 2... Endless belt 3...
...Accumulation performance~7゛Light Salary~1゛5...Laser light source 6...Pull t-y + Nomekumi 5-8.
..... Source 9a, 91) ..... Beam expanding lens 10 ..... Light shielding means 10a, 10c, 10F ..... - Light shielding i”rls)
'A10 b, 10 e, 10 g =...-
Drive LIS10 h・・・・・・Circle plate

Claims (4)

[Claims] (1) An excitation light source, a main scanning means for performing main scanning by reciprocating a light beam emitted from the excitation light source, and performing main scanning on a stimulable phosphor sheet on which image information is accumulated and recorded; The direction of distortion is a sub-scanning means that performs sub-scanning in a direction perpendicular to the y direction, and stimulated luminescence light corresponding to image information emitted from this sheet is generated by scanning the excitation light onto the stimulable phosphor sheet. In an image scanning reading device having a reading means for photoelectrically reading, a focusing means for focusing the light beam at a point on the optical path of the light beam is provided, and the light beam focused by the focusing means is 1. A single-image scanning reading device, characterized in that a light shielding means is provided at a convergence position in synchronization with the reciprocating main scanning and for blocking passage of the light beam during the retrace scanning period of the main scanning. (2) The light shielding means has a rotating shaft that is substantially parallel to the beam, and has a cover that rotates in synchronization with the forward main scanning and blocks passage of the beam during the retrace scanning period. 2. The image scanning reading device according to claim 1, wherein the image scanning reading device is a sector. (3) The light shielding means has a rotating shaft perpendicular to the beam KF, and a light shielding member consisting of a groove having a pair of opposing side walls is provided at the tip of the rotating shaft, and the light shielding member is provided with a light shielding member consisting of a groove portion having a pair of opposing side walls. Galvanometer light blocking means configured to rotate reciprocatingly in synchronization with scanning, the beam passing between both side walls of the groove during the forward main scanning period, and between the both side walls of the groove during the retrace scanning period. 2. The image scanning/reading device according to claim 1, wherein said beam is prevented from passing through by a portion. (4) The light shielding means is a piston-type light shielding means having a plate-shaped light shielding member that is provided substantially perpendicular to the beam and moves back and forth in synchronization with the reciprocating main scanning, and the light shielding means is a piston type light shielding means having a plate-shaped light shielding member that is provided substantially perpendicularly to the beam and moves back and forth in synchronization with the reciprocating main scanning, and during the retrace scanning period. The #i image scanning reading device described in item 11 of the 11th section of Patent No. 1, characterized in that the light shielding member is arranged so as to prevent the beam from passing through.