JPS62216578A - Color illuminating light source device - Google Patents

Abstract

PURPOSE:To obtain the titled device small in size low in cost and high in scanning speed by providing plural anode electrodes, a phosphor having a mutually different luminescent color, a color fluorescent illuminating tube having a thermal cathode filament and a driving circuit to change over an impressing voltage at a high speed and alternately for respective phosphors. CONSTITUTION:On a substrate glass 2, three belt-shaped anode electrodes 20 are bonded, and on them, a belt-shaped phosphor is laminated. These phosphors respectively emit a red light, a green light and a blue light. In the upper direction of respective these phosphors R, G and B, a thermal cathode line 22 is extended. The electrode of respective phosphors are connected to a driving circuit 24 to assemble a delaying circuit. When the voltage is applied to an electrode in the illuminating tube in a vacuum condition, the impressing timing of the impressing voltage is delayed successively for respective phosphors by the driving circuit 24, thereby, obtaining successively red, green and blue lights.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a color illumination light source device, and more particularly to a color illumination light source device that can be applied to digital copying machines, facsimile machines, image scanners, etc. that read color images in color. be.

(Prior art) Conventionally, as an illumination light g device for reading a color image 4(, ■A device with multiple lens systems equipped with filters, etc., and multiple image sensors corresponding to each lens system; ■A device with one image sensor in one lens system. 2. Description of the Related Art Devices and the like that read color information by switching illumination light sources are known.

However, among these techniques, although simultaneous scanning is possible with ① and ②, there is a problem that the alignment of the device becomes complicated, leading to larger size and higher cost of the device. Although there are no problems in (2) and (2), there is a problem that high-speed scanning cannot be performed if sequential scanning takes time for switching illumination light, etc. Furthermore, when a plurality of illumination light sources are used, there are still problems of increased size and cost of the apparatus.

(Objective) Therefore, an object of the present invention is to provide an improved color illumination light source device that can solve the above problems.

(Structure) In order to achieve the above object, the present invention includes a plurality of anode electrodes provided on a sealed substrate glass, and fluorescent lights having different emission colors arranged on each of these anode electrodes. A color fluorescent illumination tube whose main components include a hot cathode filament provided opposite each of these phosphors, and a high-speed The present invention is characterized in that the color illumination light source device is configured with a drive circuit that alternately switches the applied voltage.

A detailed description will be given below based on five embodiments of the present invention.

In the examples shown in FIGS. 1 and 2, the phosphor is formed into a strip. Reference numeral 2 indicates a substrate glass, and a long cylindrical color fluorescent illumination tube 10 surrounded by sealing glasses 4, 6, a face glass 8, etc. is constructed based on the substrate glass 2. Note that the longitudinal ends are also sealed with sealing glass 12, 14.

What is on the substrate glass 2? Three +F-shaped anode electrodes 2o are bonded together, and a band-shaped fluorescent material is laminated on top of each anode electrode 2o. These phosphors are appropriately selected and provided so as to emit light having spectral characteristics as shown in FIG. 9, for example. A phosphor that emits red light is designated by R1, a phosphor that emits green light is designated by G, and a phosphor that emits 111 color light is designated by B. Furthermore, hot cathode rays 22 are stretched above each of these phosphors R, G, and B.

Lead wires are led out from these electrodes corresponding to each of the fluorescent bodies R, G, and [3, and are connected to a drive circuit 24 incorporating a delay circuit.

When a voltage is applied to the electrodes in the illumination tube in a vacuum state, thermionic electrons emitted from the hot cathode filament reach the phosphor and emit light of various colors.

At this time, if the drive circuit 24 sequentially delays the application timing of the applied voltage for each phosphor, red, green, and blue light can be sequentially obtained.

Here, the color illumination light source device i2 shown in FIGS. 1 and 2 is slightly modified, for example, the sealing glass 8 is replaced with a sealing glass 80 integrally formed with three cylindrical lenses, and 24 in combination, the area to be illuminated can be efficiently illuminated at a fixed position as shown in FIG.

Alternatively, as shown in FIG. 4, the same effect can be obtained by using the anode electrode 200 as a transparent electrode, extracting the luminous flux from the back surface of the substrate glass 2, and combining it with a cylindrical lens 800.240.

In the above example, band-shaped phosphors are used, arranged at intervals, and each color of light is focused on the same line, but there are other examples.

As shown in FIGS. 5 and 6, the anode electrode 2000 and the phosphors R1, Gl, and Ill are each formed into small rectangles.

They can also be arranged alternately in a line. here,
Fluorescent material R1 emits red light, fluorescent material Gl emits green light, fluorescent material 81
shall each emit blue light.

Each anode electrode 2000 is commonly connected to a drive circuit 2400 with a built-in delay circuit for each combination with a fluorescent material that emits light of the same color.
It is connected to the.

Therefore, according to this color illumination light source device, red, green, and blue light emission can be obtained in a line shape at regular time intervals. Moreover, this light emission interval can be switched at high speed.

As a means for converging the linear luminous flux in the color illumination light source device shown in FIGS. 5 and 6 onto the document surface, a combination of, for example, a cylindrical bar lens is used. In FIG. 7, the bar lens 30 is provided on the face glass 8. As shown in FIG. Alternatively, in a color illumination light source device in which the anode electrode is made of a transparent electrode and the luminous flux is taken out through the substrate glass, as shown in FIG. It can be focused. Reference numeral 36 indicates a transparent electrode.

The color illumination light source device described above can be applied to a color reading device.

Application examples thereof will be explained below with reference to FIGS. 1O to 12. For convenience of explanation, the color illumination light source device is as follows:
Although the one shown in FIG. 7 is illustrated, color reading is not limited to this, and the color illumination light source devices illustrated in FIGS. 3, 4, and 8 can also be read in a manner similar to the illustrated example. It can be applied to the device.

In the example shown in FIG. 10, the light emitted from the color illumination light source device 100 is provided so as to be focused on the document 60 in a line shape. Then, the reflected light from the original 60 is reflected by the mirror M, passes through the reduction lens system 40, and is imaged on the solid-state image sensor 42.

Here, reading of the original is performed as follows.

For example, when the document is fed in steps, the solid-state image pickup device 42 performs reading multiple times per step, and three times when the emitted light is of three colors. Then, in synchronization with each reading, the color of light emitted by the color illumination light source device is switched. The scene balance of each luminescent color, that is, the three colors, is adjusted by controlling the illumination time or input power for each luminescent phosphor.

Further, when the document 60 is continuously fed instead of being fed in steps as described above, each light emitting color is switched sequentially at high speed. These timing controls and logical determination of color information may be performed using known electrical methods.

Next, the example shown in FIG. 11 is an example in which the present invention is applied to a 1-magnification compact scanner composed of a rod lens array and, for example, an amorphous semiconductor sensor.

The reflected light beam from the original 60 is imaged onto the solid-state image sensor 42 via the rod lens array 44.

Further, in the example shown in FIG. 12, a roof mirror lens array 46 is provided in place of the rod lens array 44 in the above example.

Here, the roof mirror lens array 46 is a known equal-magnification type imaging means, including a roof mirror 46A, a lens array 46B,
It is made up of a combination of mirrors 46C and the like having continuous right-angled uneven surfaces.

The color illumination light source device on each side described above has the advantage of being able to provide switching illumination of a plurality of colors with one illumination light source, occupying a small space, and reducing costs.

In addition, the high response response of fluorescent light, which is a characteristic of fluorescent tubes, enables instantaneous color switching and high-speed reading. Furthermore, the fluorescent tube itself can be driven with low power consumption, can be constructed compactly, and is low cost.

(Effects) According to the present invention, a color illumination light source capable of high-speed scanning can be provided compactly and at low cost, which is advantageous.

[Brief explanation of drawings]

Figure 1 is a plan view illustrating the basic configuration of a color illumination light source device using band-shaped phosphors, Figure 2 is a sectional view of the same figure, and Figure 3 is a cross-sectional view of the same figure.
Figure 4 is a cross-sectional view illustrating an example in which a light focusing lens is combined with a color illumination light source device using a band-shaped phosphor, and Figure 5 is a color illumination light source device using a fragmented phosphor. 6 is a cross-sectional view of the same figure as above, and FIGS. 7 and 8 each show a color illumination light source using fragmented phosphors combined with a light focusing lens. FIG. 9 is a cross-sectional view illustrating an example of usage, FIG. 9 is a diagram illustrating the spectral characteristics of the color of light emitted from a fluorescent body, and FIGS. FIG. 2 is a diagram illustrating a configuration when 2.34...Substrate glass, 20.36.200.20
00... Anode"lii pole, 22... Hot cathode filament, 24.240... Drive circuit, R, G, B,
R1,81,Gl...fluorescent substance.

Claims (1)

[Claims] A plurality of anode electrodes provided on a sealed substrate glass, phosphors having different luminescent colors arranged on each of these anode electrodes, and phosphors provided opposite to each of these phosphors. It is characterized by having a color fluorescent illumination tube whose main component is a hot cathode filament, and a drive circuit that is connected to the electrode of each phosphor and switches the applied voltage alternately at high speed for each phosphor. Color lighting light source device.