JPH03142413A - Optical scanner - Google Patents

Abstract

PURPOSE:To reduce the size and weight of the optical scanner for color by rotating a rotating body consisting of a filter unit and light shielding wall with a through-hole enclosing a light source by different controls. CONSTITUTION:The filter unit 2 is first rotated by a motor 7 to move the red filter part 2R to the position facing the incident end of an optical fiber array 8. A pinhole 4 successively scans the incident end of the array 8 and the light of the light source 8 subjected to luminance modulation is efficiently condensed by the lens 5 to the hole 4 and is made incident to the fiber when the rotating body 3 is rotated. The array 8 changes the circular scanning to rectilinear scanning and executes the main scanning of a photosensitive part 9. The photosensitive part 9 rotates by one dot and auxiliary scanning is executed during the time when the hole 4 scans the remaining 240 deg.. The unit 2 rotates by 120 deg. when the exposing of the red image for one screen is finished by repeating this operation. The green and blue images are similarly formed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an optical scanning device.

[Prior Art] Conventionally, there has been a color optical scanning device as shown in FIG.

The luminance-modulated light source 11 is focused, and the color filter 1
2 (switched by rotating from red to green to blue for each scan) is transmitted and then converted into circular scanning by a crank type optical fiber scanner 13. The tip of the real rank optical fiber is in close contact with the circular end face of the circular-to-linear conversion optical fiber array 14, and the optical signal is transmitted through the circular-to-linear conversion optical fiber 14 and synchronized with the rotation of the scanner at the straight end face. A linear optical scanning signal is output. A color image can be obtained by placing color photographic paper 15 in close contact with the linear end face and stepping the paper every three scans of red, green, and blue.

[Problems to be Solved by the Invention] However, in the conventional optical scanning device, the color filter driving section and the optical scanning section were independent, so the device was large.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an optical scanning device that is small and lightweight even though it has a color filter driving section and an optical scanning section.

[Means for Solving the Problem] In order to achieve this object, the device of the present invention includes a light source surrounded by a filter unit having a plurality of color filters,
It has a structure in which a rotating body having a transparent hole surrounds it.

[Function] According to the present invention having the above configuration, the position of the transmission hole moves as the rotating body rotates. Therefore, it is possible to selectively irradiate light onto, for example, optical fibers arranged along the moving path of the transmission hole. The internal filter unit rotates under different control from the rotating body, and converts the filter at the position overlapping the transmission hole.

[Example] Hereinafter, a first example embodying the present invention will be described with reference to FIGS. 1 and 2.

FIG. 2 is a schematic diagram of the light emitting section 10 used in the device of this embodiment. In the figure, a lamp 1 emits light by a drive signal modulated by a video signal input from the outside.
A filter unit 2 is attached around the .

This filter unit 2 is cylindrical and has a diameter of 3 mm in the circumferential direction.
They are equally divided to constitute a red filter 2R, a green filter 2G, and a blue filter 2B, respectively. It is desirable that these filters have low surface reflection and low diffusion.

Further, this filter unit 2 is held rotatably about its cylindrical axis, and is rotated by a motor 7 attached below the lamp.

A rotating body 3 having a cylindrical shape and coaxial with the filter unit is provided outside the filter unit. This rotating body 3 has a pinhole portion 4 provided at one point on the circumferential surface.
The other parts are made of light-shielding material, and the pinhole part 4
A lens 5 is attached inside. This rotating body 3
is rotatable about the shaft, and is rotated by being driven by a known motor above the lamp.

As shown in FIG. 1, the entrance side ends of the optical fiber arrays 8 are lined up in a circular arc section with a center angle of 120@ in the circle that is the rotation locus of the pinhole section 4 as the rotating body 3 rotates. . The output side end of this optical fiber array 8 is a photosensitive section 9.
are closely facing each other.

This photosensitive section 9 forms a color image by being sensitive to light of each color.

The operation of this device configured as described above will be explained below.

Prior to inputting a signal, initial settings of the filter unit 2 are first performed. The filter unit 2 rotates under the drive of the motor 6 and moves to a position facing the input end of the optical fiber array 8 . Then, the rotating body 3 rotates, and the pinhole 4 scans the input end of each fiber of the optical fiber array 8 one after another.

At this time, the light is efficiently focused on the pinhole by the lens 5 and enters the fiber. This circular scanning is converted into linear scanning by the optical fiber array 8, and main scanning of the photosensitive section 9 is performed. Then, while the pinhole 4 scans the remaining 240° range that does not face the input end of the optical fiber array, the photosensitive section 9 rotates by one dot, and sub-scanning is performed.

In this way, main scanning and sub-scanning are repeated, and when one screen worth of red image has been exposed, the filter unit 2 is
° Rotate so that the green filter 2G connects to the optical fiber array 8.
The photosensitive section 9 returns to its initial position. Then, the main scanning and sub-scanning are similarly repeated to form a green image.

Once the green image is formed, the filter unit 2 similarly rotates to form a blue image.

The photosensitive area 9 has been exposed to three colors of light in this way.
is developed using a known developing device.

The above example is an example in which images are formed by separately performing main scanning and sub-scanning for each color. For this reason, it is necessary to return the photosensitive section to its original position after each sub-scanning, which requires a long time for image formation. The input end of the optical fiber array 8 is
It can only be installed within a range of 120@ around the rotation axis, resulting in low scanning efficiency.

A second embodiment that improves this point will be shown below with reference to FIGS. 4 and 5.

In this embodiment, the filter unit 2 is rotated 480'' during one rotation of the rotating body 3.This control method includes a method using a phase-locked loop, a method using a single motor, A method of decelerating one side with a gear is considered.The input end of the optical fiber array is brought into close contact with half the circumference of the rotating body configured in this way.This operation is illustrated in Figures 4(a) to 4(d). ).

The filter rotating body 22 and the slit rotating body 23 are shown in FIG.
) The filter rotating body 2 shall rotate in the direction of the middle arrow A.
2 rotates at an angular velocity 4/3 times that of the slit rotating body 23. In other words, if the operation starts from Fig. 4(a), the state in which the slit rotating body 23 is rotated by 90° is the fourth point.
Figure (d) shows the state rotated by 180', and Figure 5 (c) shows the state rotated by 180'.
The state after 3600 rotations is shown in FIG. 4(d). That is, when the slit rotating body rotates half a rotation, the blue light is scanned, and when the slit rotating body rotates three times, the blue light, green light, and red light scan, and one line is completed, and the process advances to the next line. By repeating the above steps, two predetermined areas of the photosensitive portion can be exposed.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, the filter can be made smaller and lighter despite the provision of the filter rotation section and the slit section. In addition, it is possible to expose the photoreceptor to light in the copying wavelength range, and photographic paper, JP-A-62
It is effective for devices using so-called microcapsule sheets, etc., which utilize photopolymerization and color development reactions of colorless dyes, as described in Japanese Patent No. 150242 and the like.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, FIG. 1 is a diagram showing the overall configuration of the device of the first embodiment, and FIG.
The figure shows the surroundings of the rotating body of the device, FIG. 3 is a diagram showing the overall configuration of the device of the second embodiment, and FIG. 4 is a diagram illustrating the operation of the device. Further, FIG. 5 is an example of a conventional device shown for comparison with the present invention. In the figure, 1 is a lamp (light source), 2 is a filter unit, 2
R, 2G, 2B are filters, 3 is a light-shielding wall, 4 is a rotating body that is a pinhole (light-shielding wall), and 5 is a pinhole (transparent hole)
It is.

Claims (1)

[Claims] 1. A light source, a filter unit in which a plurality of filters are arranged to surround the light source, a filter unit rotatable around the light source, a light shielding wall and a transmission hole, and a filter unit that rotates around the filter unit. An optical scanning device including a rotatable rotating body arranged to surround the optical scanning device.