JPS60201318A - Image recording device - Google Patents

Abstract

PURPOSE:To solve problems of resolution, picture quality, and gradational resolution and to vary easily an image plane in size by providing a recording medium positioning means which moves a recording medium to a specific position so that plural two-dimensional images reproduced by a subscanning means and an optical deflecting means are recorded on the same recording medium. CONSTITUTION:A holding plate 10 and a slide plate 20 are moved to where the 1st frame of a film 9 is exposed. Then, a laser beam modulated on the basis of an image signal is made incident on the reflecting surface of a polygon mirror 3 and its reflected beam is guided onto the film 9 through an f.theta lens 4, fixed mirror 5, and moving mirrors 6 and 7 to move the obtained light spot on the film 9 in a main scanning direction. Further, the moving mirrors 6 and 7 are moved in the same direction synchronously with the main scanning to make a subscan. Thus, the film 9 is moved to the position of the exposure of the 2nd frame after the exposure of the 1st frame is completed, and the 2nd frame is exposed similarly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an image recording device that can record a plurality of images on the same recording medium.

(Prior art) Medical image data such as X111CT images and ultrasound diagnostic equipment images are stored as electrical signals, and multiple double-sided images are recorded on the same recording medium (film, etc.). ing.

Incidentally, a conventional device of this type is known as a multi-frame photographing device, and its schematic configuration is shown in FIG. This device uses a lens to project and expose images on the surface of a cathode ray tube (CR'T) onto film. In Figure 1,
a is a cathode ray tube with a flat tube surface, b is a lens for projecting and forming an image on the tube surface of the cathode ray tube a onto a film C which is a recording medium, and d is a lens that holds the film C and There is a positioning method 1j1411 for moving the film C two-dimensionally within a plane containing the film C. By moving the film C using the positioning mechanism d and repeatedly photographing, for example, as shown in FIG.
12 screens (pieces) of 4 (vertical) x 3 (composition) on top A11""A
43 recordings can be made.

Note that the imaging magnification is changed by moving the cathode ray tube a and the lens b in the optical axis direction.

However, this type of image recording apparatus using a cathode ray tube has the following drawbacks.

■The resolution is limited to 11 degrees by the cathode ray tube, and even if the original image is good, a high-resolution thin image cannot be obtained.

0 The image quality differs at the center edge of the screen (due to the characteristics of the cathode ray tube itself and image formation by the lens).

■Raster grooves impair image quality.

■The dynamic range of a cathode ray tube (1 degree) is narrow, and sufficient gradation resolution cannot be obtained.

■ Image distortion is likely to occur due to changes in electron beam scanning speed traces.

(Object 1 of the Invention) The present invention has been made in view of the above points, and an object thereof is to solve the problems regarding resolution 9 image quality and R1i scale resolution in the device using the above-mentioned cathode ray tube, and to The object of the present invention is to realize an image recording device whose size can be easily changed and whose recording speed is relatively high.

(Structure of the Invention) The present invention that achieves this object includes a laser light source that emits a laser beam, a light modulation means that modulates the laser beam based on Image No. 13, and a laser beam modulated by the light modulation means. a sub-scanning unit that provides a relative position between the laser beam and the recording medium in order to move the deflected Radhe beam in the sub-scanning direction on the recording medium; The recording medium is moved to a predetermined position in order to record a plurality of two-dimensional images reproduced by the sub-scanning means and the optical deflection means on the same recording medium.
The present invention is characterized by comprising a recording medium positioning means.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a block diagram showing one embodiment of the present invention.

In the figure, 1 is a laser light source such as a gas laser, and 2 is a laser beam emitted from the laser light source 1.
The optical converter L3 is an optical deflector that deflects the laser beam modulated by the optical modulator 2. Here, a polygon mirror is shown as the optical deflector 3 (hereinafter, the symbol @3 will be used and explanation will be given by taking one polygon mirror as an example). 4 is a 1 .theta. lens, and after the laser beam reflected by the mirror surface of the polygon mirror 3 passes through the r.theta lens 4, it is perpendicular to the optical axis of the .theta lens 4 and 45 The beam is incident on the tilted fixed mirror 5. 6 is a movable mirror that moves at a constant speed V in the vertical direction in FIG. It consists of a mirror 6b joined so that the reflective surfaces are perpendicular to each other.7
3 is also a movable mirror, which moves at a constant speed II 2 V in the vertical direction in FIG. 3 while maintaining a state parallel to the mirror 6a. The reason why the speed ratio is set to 248 here is to make the optical path length constant. The movable mirrors 6 and 7 are synchronized with a drive means (not shown) (a means often used in copying machines, etc.; for example, one end of the wire A1 is locked to the movable mirror 7, and the middle portion of the wire A7 is moved). It is wound around a pulley and folded back, and the folded end of A is fixed, and the movable mirror 6 is attached to the movable pulley, and the moving directions are the same. The movable mirrors 6 and 7 constitute a sub-scanning means. 8 is a positioning mechanism for the film 9, which holds the film 9 and moves it in two directions, horizontal (x) and vertical (y) as shown in FIG. It is something that

4 and 1115 are perspective views showing the specific structure of the positioning mechanism 8, with FIG. 4 being a view seen from the front side, and FIG. 5 being a view seen from the back side. In these figures, 10 is a film holding plate, and the holding plate 10 has a plurality of numbered plates arranged on the back side thereof in parallel in the horizontal direction (x/j direction) through the slots. It is movably supported on bars 11.12. 13 is a DC motor for driving the holding plate 10 in the
A part of the belt 15 is fixed to the holding plate 10 using a locking member 16.

17 is a rotary encoder for detecting the current position (X direction) of the holding plate 10 (film 9) from the rotation of the fixed 0-514.

Reference numeral 20 denotes a slide plate, and the slide plate 20 is moved in the vertical direction (■
direction) and is movably supported by I-bars 21 and 22. Note that both ends of the bars 21 and 22 are fixed to the holding plate 10. Reference numeral 23 denotes a countercurrent E-coil for driving the slide plate 20 in the y direction, and a belt 25 is wound between the pulley 23a attached to its output shaft and the fixed pulley 24. A portion of the belt 25 is fixed to the slide plate 20 (film 9) using a locking member 26. 27 is 1” - Tully J, encoder,
From the rotation of the pulley 23a, the current position of the slide plate 20 In<
This is for detecting the direction (vli direction).

The holding plate 10 has a pair of elongated holes 10a, 10 in the V direction.
1+ is bored, and film holding claws 28a, 28
b is attached to the holding plate 10 so that it can protrude from the back side of the holding plate 10 to the front side through the elongated holes 10a and 10'b. 31 is a film supply roller; 32 is a film supply path r; the film 9 is fed by these;
The position in the X direction is regulated by a pair of guides 33a and 33b with a substantially 1-shaped cross section fixed on the back side of the holding plate 10.
The position in the y direction is controlled by the mold 2B8.28b. 34 is a film discharge path, 3 and 5 are film discharge rollers, and these are the film 9 after fogging is completed.
There is a device C for discharging.

Next, the operation of the embodiment J will be explained.

The film 9 is loaded by rotating the film feeder 31, feeding the film 9 into the positioning m4RB through the film feed path 32, and supporting the lower end of the film 9 with the claws 28a and 28b. The holding plate 10 and the slide plate 20 are moved to a position for exposing the first frame of the film 9 (for example, A11 in FIG. 2). That is, the motor 13.23 is rotated forward or 4i reversely so that the output of the encoder 17.27 becomes a predetermined value, and the holding plate 10 and the slide plate 20 are moved in the X direction and the {circle around (2)} direction, respectively. After that, 1iii II! A laser beam modulated based on 4 m H is made incident on the reflective surface of the polygon mirror 3, and the reflected beam is passed through the f/θ lens 4. Fixed mirror 5. The light spot is guided onto the film 9 via the movable mirrors 6 and 7, and the resulting light spot is moved on the film 9 in the main scanning direction. Furthermore, in synchronization with this main scanning, the movable mirrors 6 and 7 are moved in the same direction as described above to perform sub-scanning. When the exposure of the first frame is completed by the above operations, the film 9 is moved to the position for exposing the second frame, and the second frame is exposed in the same manner as described above. Thereafter, the same exposure is repeated, and when the exposure of the final frame (/C, for example, A43 in FIG. 2) is completed, the claw 2 (3a, 28tl) is inserted from the front side of the holding plate 10 into the elongated hole 8a, Bb or Let the back side choose.Follow C
, the film 9 falls into the film discharge path 34 due to its own weight, is pressed by the film discharge roller 35, and is discharged to the outside. Note 1. The sequence of operations described in F is performed by a control section (not shown).

According to the above configuration, since recording is performed using a laser beam rather than the m-image on the tube surface of a cathode ray tube, the resolution problems, the 11lii quality problem, and the gradation resolution problem in conventional devices can be solved. In addition, the a1 scanning means (moving mirrors 6 and 7), which requires constant speed, are moved from the positioning mechanism 8 to f).
1111, the positioning mechanism 8 can only be required to have high speed, and can perform positioning at high speed.

Although it is a scanning type recording, relatively high-speed recording is possible.

Furthermore, since recording is performed frame by frame, a buffer memory with a storage capacity of V for one frame is sufficient. Furthermore, changing the screen size can be easily accomplished by changing the scanning speed.

Note that the configuration of the present invention is not limited to the embodiment described above; for example, the configuration of the retaining plate 10 in the positioning mechanism 8
Alternatively, the slide plate 20 may be partially driven using a linear drive. Further, although this positioning is performed using a servo loop, it may also be performed using an oven loop using a pulse motor. Furthermore, optical elements may be added as necessary to the optical system for writing using a laser beam. For example, in order to correct the color error caused by the tilting of the polygon mirror, a known single stage may be used and a °C cylindrical lens may be added.

(Results of the invention) As explained above, according to the present invention, a device using a cathode ray tube can have a resolution of 1 and a resolution of 1I11j4.
The image recording device solves the problem of resolution, allows easy change of screen size, and achieves relatively high-speed recording.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the conventional configuration of this type of @Oka, Fig. 2 is an explanatory diagram of the frame position of film 1-, Fig. 3 is an i-factor of an embodiment of the present invention, and Fig. 4 is Fig. 3. FIG. 5 is a front side perspective view of the positioning mechanism inside, and FIG. 5 is a back side perspective view. 1...Laser light source 2...Luminous intensity device 3...Polygon mirror (light deflector) 4...1 ・θ lens 5...Fixed mirror 6.7・
...Moving mirror (group 1 scanning means) 8...Positioning 11
1i9...Film version 1 picture kite 2 picture 3 3 pictures 4 picture

Claims (1)

[Claims] (1) A laser light source that emits a radar beam, and the laser beam ii! iif# Change based on A signal! 1l111
A light modulating means 1, and a light deflecting means for deflecting the laser beam modulated by the light modulating means in the main scanning direction. a sub-scanning means for applying a relative displacement between a laser beam and the recording medium; and a predetermined position of the recording medium in order to record a plurality of two-dimensional images reproduced by the sub-scanning means and the optical deflection means on the same recording medium. An image recording apparatus comprising a recording medium positioning means for positioning the recording medium. Image recording device 0 according to item 1 in the range of