JPS6340131A - Light source device for illuminating color image original - Google Patents

Abstract

PURPOSE:To continuously obtain a light emission spectrum in the whole area of a visible light by constituting a molecular light emission continuous spectrum electric discharge lamp being a point light source body, of plural pieces of one-dimensional linear array bodies, or two-dimensional face-shaped array bodies. CONSTITUTION:A molecular light emission continuous spectrum electric dis charge lamp simple substance (a) (positive lamp) being a point light source is provided with a glass bulb 1, a pair of discharge electrodes 2, 2 which is enclosed in the glass bulb, voltage applying terminals 3, 3 to each discharge electrode, and conductors 4, 4 for connecting mutually each discharge electrode and the voltage applying terminal, and in the glass bulb 1, metallic gas and inert gas are led in and sealed up. A light source device of a one-dimensional linear array body state is constituted by arraying and providing plural pieces of said positive lamps (a) linearly and in one line along the longitudinal direction of a common tubular supporting glass bulb 6. In such a way, a light source device of a power-saving type for reading photoelectrically a color image which is possibly exact by bringing the color image to color resolution, or obtaining a copy whose color reproducibility which is possibly good can be constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to color image original illumination in color separation photoelectric reading devices for color images (full color images/multicolor images), color separation exposure copying devices, etc. This invention relates to a light source device.

[Conventional technology]

Conventionally, a fluorescent lamp or a halogen incandescent lamp is generally used as a light source for document illumination in the above-described apparatus.

[Problem that the invention seeks to solve]

One of the requirements for color-separated photoelectric reading and copying (color image reproduction) of color images as accurate as possible is that the illumination light source for color image originals is a white light source whose emission spectrum has a continuous distribution over the entire visible light range. It is necessary.

In this regard, fluorescent lamps have light composed of one or more independent spectra, and the color tone of a color image illuminated by this light source is actually quite different from that under white light.

Furthermore, a halogen incandescent lamp basically emits hot rays, and its emission spectrum becomes extremely small as it approaches the short wavelength and blue region. FIG. 7 is a spectral energy distribution diagram of a halogen lamp. Therefore, bullet-emitting light bulbs are used to increase the light intensity level in the short wavelength region of the low-light device to the required level, but bullet-emitting light bulbs consume a large amount of power.

In view of the above, it is an object of the present invention to provide a light source device that is suitable as an illumination light source for color image originals, has a continuous emission spectrum in the entire visible light range, and is of a power saving type.

Summary: Structure of the Invention [Means for Solving the Problems] The present invention is directed to a plurality of one-dimensional linear arrays or two-dimensional surface arrays of molecular-emitting ZU spectrum discharge lamps as substantially point light sources. The gist of the present invention is a color image document illumination light source device comprising a shaped array.

[For production]

Molecular luminescence I! I-class spectral discharge lamps have a pair of discharge electrodes and a metal gas/inert gas sealed inside a glass bulb, and when a high voltage is applied to the pair of discharge electrodes, the discharge generated between the pair of electrodes causes the metal gas inside the bulb to reach a high temperature. Status! It emits light with a continuous spectrum in the entire visible light range, mainly emitted by metal molecule excitation. Figure 6 shows its spectral energy distribution. This discharge lamp itself is essentially a point light source, and by itself, it can be used as a light source for illuminating a color image document, evenly illuminating each part of the document surface along the main scanning line. Provide linear illumination with sufficient light intensity. Alternatively, it is impossible to uniformly illuminate each part of the entire document or localized areas with a sufficient amount of light.

Therefore, the present invention is a molecular emission continuous spectrum discharge lamp which essentially serves as a point light source, and is made by assembling a plurality of them into a one-dimensional linear array or a two-dimensional planar array. Each part of the document surface along the main scan reading line is linearly illuminated with light of a continuous spectrum in the entire visible light range uniformly and with sufficient light intensity using a one-dimensional linear array configured with an arrangement density and appropriate length. be able to. In addition, by using a two-dimensional planar array configured with an appropriate arrangement density and an appropriate area φ outer shape, each part of the entire or local surface of the document can be illuminated uniformly and with a sufficient amount of light with continuous spectrum light in the entire visible light range. can do.

The power consumption of the entire one-dimensional or two-dimensional array light source device is actually significantly lower than that when a conventional bullet-emitting halogen lamp is used.

〔Example〕

Fig. 5 shows the configuration of a single molecular emission continuous spectrum discharge lamp a (hereinafter referred to as a sunlight lamp) which essentially serves as a point light source, where l is a glass bulb and 2 is a light source inside the glass bulb. In the sealed pair of discharge electrodes, 3 and 3 are voltage application terminals for each of the discharge electrodes, and 4 and 4 are conductive wires that connect each discharge electrode and the voltage application terminals. A metal gas/inert gas is introduced into the glass bulb 1 and sealed therein, and 5 indicates a sealing part (bulb getter) of the introduction port.

FIG. 1 shows a light source device η in the form of a -dimensional linear array by arranging a plurality of the above-mentioned sunlight lamps a in a straight line along the length of a common tubular supporting glass bulb 6. This is an example.

FIG. 2 shows a modification of this light source device, in which the discharge electrodes 2 and 2 of each sunlight lamp a are connected to the adjacent glory lamp aS.
A voltage is applied between a pair of terminals 3 and 3 provided at both ends of the support valve 6. Fig. 3 shows an example of a linear light source device having two rows of sunlight lamps, and Fig. 4 shows a plurality of sunlight lamps a on a common support 7.
FIG. 2 is a plan view of a part of a planar light source device in which the light sources are two-dimensionally arranged.

C5 Effects of the Invention As described above, according to the present invention, a color image can be separated into colors to perform photoelectric reading of the color image as accurately as possible, or to obtain a copy with as good color reproducibility as possible. It is possible to configure a power-saving light source device that is suitable as a color image original illumination device.

[Brief explanation of drawings]

Figures 1 to 44 are schematic diagrams of the configuration of the first to fourth embodiments, respectively, Figure 5 is a diagram of the configuration of a single sunlight lamp as a point light source, Figure 6 is its spectral energy distribution diagram, and Figure 7 is a spectral energy distribution map of a halogen lamp. 1 is a single sunlight lamp, 1 is a glass bulb, 2 and 2 are a pair of discharge electrodes, 3 and 3 are voltage application terminals, 4 and 4 are conductors, 5 is a bulb getter, 6 and 7 are array supports for single sunlight lamps.

Claims (1)

[Claims] (1) A color image original illumination light source device consisting of a plurality of one-dimensional linear arrays or two-dimensional planar arrays of molecular emission continuous spectrum discharge lamps substantially serving as point light sources.