JP2003090798A - Concentration irregularity observation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an observation apparatus with which irregularities in the concentration of an observation object as a whole can be observed visually and simply, without using an optical measuring apparatus such as a transmissometer, a reflectometer of the like. SOLUTION: The concentration irregularity observation apparatus is constituted of a plane light source 1, which is composed of a light source lamp and a diffuser panel and an optical filter 3 with which irradiation light emitted from the light source 1 is made incident from an oblique direction, so as to be reflected by the observation object 2 and with which reflected light reflected by the observation object 2 is transmitted through a wavelength range of a color tone used to observe the irregularities in the concentration, and the light source 1, the observation object 2 and the optical filter 3 are arranged respectively in positions, in which the reflected light transmitted through the optical filter 2 is directly incident on the observer's eyes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for observing density unevenness of an object to be observed in which a color layer having a constant density is provided on the surface of a substrate by coating, printing or the like. In particular, the present invention relates to a device for visually observing density unevenness of an observation object such as a color filter having a tile-shaped or stripe-shaped color layer that requires color layer density management.

[0002]

2. Description of the Related Art Conventionally, such density control of a color layer is performed by shining a spot light to measure the transmittance and reflectance of a local portion, measuring the transmittance and reflectance over the entire surface of an object, and measuring the variation of the fluctuation. I managed. However, since the transmittance and the reflectance are measured by irradiating the spot light, it is necessary to measure a large number of places, and it is not possible to quickly determine whether or not there is density unevenness.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides an observing device capable of visually observing density unevenness of the entire observation object easily without using an optical measuring device such as a transmittance meter or a reflectometer. Is to provide.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a plane light source comprising a light source lamp and a diffusion plate, and irradiation light emitted from the plane light source is incident from an oblique direction. It is reflected by the object to be observed, and this reflected light is composed of an optical filter that transmits the wavelength range of the color tone for uneven observation, and after passing through the optical filter, it is positioned so as to be directly incident on the eyes of the observer. The density unevenness observing device is characterized in that the flat light source, the object to be observed, and the optical filter are arranged in each.

The invention according to claim 2 is further provided with a flat light source including a light source lamp and a diffusion plate, and an optical filter for transmitting a wavelength region of a color tone for uneven observation between the optical paths of the observation object. The density unevenness observing device is characterized in that the irradiation light that has passed through is incident from an oblique direction, is reflected by an object to be observed, and the reflected light reflected is observed.

According to the third aspect of the present invention, a flat light source including a light source lamp that emits light in a wavelength range of a color tone for uneven observation and a diffuser plate, and irradiation light emitted from the flat light source are obliquely incident and observed. The density unevenness observing device is characterized by reflecting the reflected light on an object and observing the reflected light.

Further, in the invention according to claim 4, the brightness of the irradiation light emitted from the flat light source is 3000 cd / m ² to.
It is 30,000 cd / m ^2.
The density unevenness observing device according to any one of items 1 to 3.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1A shows an outline of the density unevenness observing apparatus according to the first aspect. As a light source lamp (1a), a fluorescent lamp that emits white light is arranged in parallel, and the surface is roughened or coated with diffusing particles, or a diffusing plate (1b) in which diffusing particles are kneaded is provided, whereby the brightness is A flat light source (1) configured to be uniform is constructed. Irradiation light is made to enter the observation object (2) provided with the color layer (2a) from this plane light source (1) from an oblique direction and is reflected by the observation object. An optical filter (3) that transmits the wavelength range of the hue (2a) of the observation object is provided between the observation object (2) and the observer (4) to observe the density unevenness of the observation object. .

The case where the color layer (2a) for observing the density unevenness is blue will be described as an example. The irradiation light emitted from the flat light source (1) is red (R), green (G), and blue (B). Is white light (W = R + G + B) including the wavelength component of, and when the white light is reflected by the observation object, red (R) and green (G)
Since most of the components are absorbed, the reflected light is blue (B) (= δR + δG +) containing a little red (R) and green (G).
B, where δ indicates that the R and G components are slightly included). Observing this reflected light using an optical filter (3) that transmits a blue (B) hue (wavelength 400 to 500 nm), only the blue (B) light component is reflected due to the density of the color layer (2a). The amount of light that changes is changed, and this change in the amount of light is visually observed. Therefore, the density unevenness of the color layer is visually observed. As the transmission characteristic of this optical filter (3), an optical filter having a transmission peak at a wavelength of 450 nm is used.

The incident angle with which the object to be observed is irradiated is appropriately changed and set so that the density unevenness can be observed most clearly.

FIG. 1 (b) shows a case where the optical filter is used as glasses instead of providing the optical filter between the observation object (2) and the observer (4) in FIG. 1 (b). This makes it possible to reduce the size of the optical filter.

In the figure, the thickness of the light beam shows the size of the light quantity as a model, and the thick light quantity indicates that the light quantity is large, and the thinner the light quantity is, the smaller the light quantity is.

When the brightness of the irradiation light emitted from the flat light source is about 3000 cd / m ² , the amount of reflected light is insufficient and density unevenness is difficult to observe, and when it exceeds about 30000 cd / m ^2, it becomes dazzling and difficult to observe. Become.

FIGS. 2 and 3 respectively show the outline of the observation device corresponding to claims 2 and 3, and the basic technical idea is the same. In FIG. 2, an optical filter (3) is provided between the observation object (2) and the optical path of the flat light source (1) to make the irradiation light blue (B) light in advance and irradiate the observation object. Observe that the amount of reflected light changes depending on the density of the color layer (2a). FIG. 3 shows a case where the light source lamp (1a) emits irradiation light having the same color tone as the color layer of the observation object without using the optical filter. Obviously, if this light source lamp is used, it is not necessary to use an optical filter for spectral separation.

As shown in FIG. 4, an example of an image obtained by observing the observation object (2) has a high or low density area as 2c and 2b unevenness.

As described above, the color layer of the object to be observed is described as blue. However, in order to observe density unevenness of other red (R), green (G), etc., an optical filter in the wavelength range of the color tone to be observed or A light source lamp that emits a wavelength range may be used.

[0017]

As described in detail above, according to the apparatus of the present invention, the density unevenness of the entire observation object can be instantly and visually observed without using an optical measuring instrument such as a transmittance meter or a reflectometer. Therefore, the quality can be instantly judged.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an observation apparatus according to claim 1 of the present invention.

FIG. 2 is a configuration diagram of an observation device according to claim 2 of the present invention.

FIG. 3 is a configuration diagram of an observation device according to claim 3 of the present invention.

FIG. 4 is a diagram showing a state where density unevenness is observed.

[Explanation of symbols]

1. Flat light source 1a ... Light source lamp 1b ... diffusion plate 2 ... Observing object 2a ... color layer 2b, 2c ... uneven density 3 ... Optical filter 4 ... Observer 5 ... Glasses using optical filters

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Claims (4)

[Claims] 1. A flat light source comprising a light source lamp and a diffusion plate,
Irradiation light emitted from the plane light source is incident from an oblique direction and is reflected by an observation object, and the reflected light is constituted by an optical filter that transmits a wavelength range of a color tone for uneven observation, and passes through an optical filter. A density unevenness observing device, wherein the flat light source, the observation object, and the optical filter are arranged so as to be positioned so as to be directly incident on an observer's eye later. 2. A flat light source comprising a light source lamp and a diffusion plate,
An optical filter is provided between the optical paths of the observation object that transmits the wavelength range of the color tone for uneven observation, and the irradiation light that has passed through this optical filter is incident from an oblique direction and reflected by the observation object, and the reflected reflection A density unevenness observation device characterized by observing light. 3. A flat light source composed of a light source lamp emitting a wavelength range of a color tone for uneven observation and a diffuser, and irradiation light emitted from the flat light source is obliquely incident and reflected by an object to be observed, and the reflection is performed. An apparatus for observing density unevenness, characterized by observing reflected light thus reflected. 4. A density unevenness observation apparatus according to any one of claims 1-3 in which the luminance of the illumination light emitted from the flat light source is characterized in that it is a ^{3000cd / m 2 ~30000cd / m 2} .