JP2000035623A - Exposure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain desired color density in a short exposure time for a blue color by using a filter having such filter transmission characteristic that the wavelength of a blue filter at the highest transmissivity nearly coincides with the wavelength of the blue developing layer of photosensitive material at the peak of spectral sensitivity. SOLUTION: A filter part equipped with blue, green and red filters is provided between a CRT and photographic paper. Then, red, green and blue pictures are displayed on the monitor of the CRT and the respective pictures are printed on the photosensitive material. In such a case, the blue filter having the filter characteristic that the transmissivity curve D of the transmitted wavelength draws a steep curve from the wavelength (about 480 nm) in the highest transmissivity toward the wavelength longer than the former as shown by a line D in figure is used. Thus, the wavelength at the peak time of the transmissivity curve D is made to nearly coincide with the wavelength (about 475 nm) at the peak time of the spectral sensitivity of the blue sensitive layer of photographic paper. As a result, the exposure time for obtaining the desired density is shortened even when the emitted light luminance of the CRT is low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus capable of printing image information on a photosensitive material.

[0002]

2. Description of the Related Art Conventionally, a CRT (cathode-ray tu) has been used as an exposure apparatus for exposing image information to a photosensitive material.
be) as an exposure means. This CRT
The exposure means electrically inputs image information such as index information to a CRT and exposes an image displayed on the CRT to a photosensitive material.

When a color image is printed by CRT exposure means, the CRT is monochrome and the CRT is
A filter unit having blue, green, and red filters is provided between the RT and the photosensitive material, and red, green, and blue images are sequentially displayed on a CRT monitor, and red, green, and , And the respective images are printed on the photosensitive material through the blue filters. At this time, the CRT emits light in a cycle of 0.125 seconds. When the number of times of light emission is small, the print density is low, and when the number of times of light emission is large, the print density is high.

[0004]

By the way, conventionally,
As the CRT, as in the CRT shown in FIG. 3, a monochrome CRT having an increased emission luminance in the red wavelength range is used, and each filter has a wavelength transmission characteristic shown in FIG. A red filter for the line, a green filter for the B line, and a conventional blue filter for the C line are used. In FIG. 4, the line D indicates the wavelength transmission characteristics of the blue filter of the present invention described later.

In general, a color light-sensitive material is formed on a paper by forming a red-colored layer (red-sensitive layer), a green-colored layer (green-sensitive layer), and a blue-colored layer. And a layer having a characteristic of drawing a spectral sensitivity curve as shown in FIG. 5 was used. FIG.
In the graph, a indicates the spectral sensitivity curve of the red sensitive layer, b indicates the spectral sensitivity curve of the green sensitive layer, and c indicates the spectral sensitivity curve of the blue sensitive layer. Here, the sensitivity refers to a reciprocal of an exposure amount (ergs / cm ² ) necessary to obtain a specific color density.

As described above, in the conventional blue filter shown in FIG. 4, the wavelength range near the peak of the transmission curve C is 410 nm to 46 nm.
The light emission intensity of the CRT corresponding to this wavelength region is very weak as shown in FIG. As for the photosensitive material, the wavelength (about 475 nm) at the peak of the spectral sensitivity of the blue-sensitive layer shown in FIG. 5 is the peak at the peak of the transmission curve C of the blue filter shown in FIG. The wavelength when showing (about 43
0 nm), the sensitivity of the blue-sensitive layer of the photosensitive material to the wavelength at the maximum transmittance of the blue filter is poor. As a result, in order to obtain a desired color density by a blue filter, the exposure time needs to be very long (conventionally,
The CRT emitted light 16 times every 0.125 seconds. ).

SUMMARY OF THE INVENTION It is an object of the present invention to provide an exposure apparatus capable of obtaining a desired color density in a short exposure time for a bluish color even if the light emission intensity of the CRT in a bluish wavelength region is weak. .

[0008]

In order to achieve the above object, the invention according to claim 1 is provided between a light source and a photosensitive material in an exposure means for exposing image information to the photosensitive material, and comprises a blue-based material. An exposure apparatus having a filter unit having green and red filters, wherein the wavelength of the blue filter in the filter unit is the maximum transmittance of the blue filter, and the wavelength of the layer which emits a blue color in the photosensitive material. The filter has a filter transmission characteristic that substantially matches the wavelength at the sensitivity peak.

According to a second aspect of the present invention, in the first aspect of the present invention, the transmittance curve of the wavelength of the blue light transmitted through the blue filter of the filter unit is calculated from the wavelength at the highest transmittance. It has a filter characteristic that draws a steep curve toward longer wavelengths. According to a third aspect of the present invention, in the first or second aspect, the light source of the exposure means is a monochrome CR.
It was T.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a photograph processing apparatus,
A printing unit (photosensitive material) P drawn from a magazine 13 is transported to a printing unit 11 by a transport roller 14, and image information is printed.

The printing section 11 includes film exposure means 3 for exposing the film 2 to print image information on the photographic paper P;
The exposure apparatus 1 includes a CRT exposing unit 5 that prints image information on the photographic paper P by displaying image information electrically input to the CRT 4 on the CRT and exposing the image information. Then, the photographic paper P on which the image information is printed is conveyed to the developing unit 12 and subjected to the developing process, and then cut into a predetermined size and discharged from the apparatus.

The film exposure means 3 irradiates the film 2 with light from a lamp 31 as a light source, and exposes the light transmitted through the film 2 to a photographic paper P which is stationary on an exposure stage 6 so that image information of the film 2 is obtained. Is printed on photographic paper P. The CRT exposure means 5 includes a light source CR.
Image information such as index information and character information electrically input to T4 is displayed on the CRT 4, and the image information displayed on the CRT 4 is exposed on photographic paper P to print an image. In addition, CRT (cat
(ode-ray tube) is a cathode ray tube.

When the index information is printed on the photographic paper P by the CRT exposure means 5, each frame image of the film 2 is read by a reading device (not shown) and the information is provided in a photographic processing device. And the control unit 7 converts the image information of each frame into index information,
The index information is input to the CRT 4 to display the image information, and the image information emitted from the CRT 4 is printed at an arbitrary position on the photographic paper P.

Thus, an image of each frame of the film 2 is reduced and printed on one sheet of photographic paper, and an index print for displaying an index of each frame image is created. In the case where character information and the like are printed on the photographic paper P by the CRT exposure means 5, character information (for example, photographing date, photographing place, event contents, etc.) input by a keyboard or computer graphic image information created by a personal computer is used. Are input to the CRT 4 and displayed on the CRT for exposure to print an image or the like on the photographic paper P.

The character information and the like may be exposed after overlapping the film image information, or the photographic paper P may be exposed alone. Further, light from the lamp 31 of the film exposure means 3 is
Alternatively, a plurality of mirrors for guiding light from CRT 4 of CRT exposure means 5 to photographic paper P are provided. These mirrors receive a light reflected from the lamp 31 of the film exposure means 3 or a light from the CRT 4 of the CRT exposure means 5 for selectively reflecting the light from the lamp 31 and a light reflected by the rotation mirror 81. Fixed mirror 82 that reflects light toward photographic paper P, and rotating mirror 8 that reflects light from CRT 4
It comprises a CRT-side fixed mirror 83 that reflects light toward 1.

The rotating mirror 81 is located on the optical path of the film exposure means 3 and on the optical path of the CRT exposure means 5,
The rotation is controlled by the control unit 7 so as to receive either one of the lights. Further, on the optical path of the film exposure means 3, between the setting portion 21 of the film 2 and the rotating mirror 81,
An exposure lens 32 for forming an image of the film image information on the photographic paper P is provided.

On the optical path of the CRT exposure means 5, between the CRT 4 and the rotating mirror 81, an exposure lens 51 for forming image information of the CRT 4 on the printing paper P is provided. A filter unit 9 including a red filter 91, a green filter 92, and a blue filter 93 is provided between the rotating mirror 81 and the rotating mirror 81. In the exposure apparatus 1 configured as described above, the film image information and C
The RT image information is exposed to an arbitrary position on the photographic paper P by the film exposure means 3 or the CRT exposure means 5 while appropriately moving the photographic paper P onto the exposure stage 6. By controlling the movement of the photographic paper P, the film image information and the CRT image information can be overlap-exposed on the photographic paper P.

When a color image is printed by the CRT exposure means 5, the CRT 4 is monochrome, and a blue filter 93, a green filter 92, and a red filter are provided between the CRT 4 and the photographic paper P, as in the prior art. The filter unit 9 including the filter 91 is arranged, and red,
Green and blue images are sequentially displayed, and each filter 91,
The respective images are printed on the photosensitive material in the order of red, green and blue via 92 and 93. At this time, CRT
Emits light in a cycle of 0.125 seconds.

As the CRT 4, as in the prior art, a CRT 4 having a light emission for improving the emission luminance in the red wavelength region shown in FIG. 3 is used.
A material having a characteristic of drawing a spectral sensitivity curve as shown in FIG. In the above exposure apparatus, according to the present invention, among the filters having the wavelength transmission characteristics shown in FIG. 4, a red filter 91 shown by A line, a green filter 92 shown by B line, and a blue filter shown by D line. Since the blue filter 93 uses the blue filter 93, the wavelength at the highest transmittance of the blue filter 93 substantially coincides with the wavelength at the spectral sensitivity peak of the blue-colored layer of the photographic paper P. It has a filter transmission characteristic.

Further, as shown by the line D in FIG. 4, the transmittance curve D of the wavelength that the blue filter 93 transmits has a wavelength at the highest transmittance (about 480 nm).
It also has a filter characteristic that draws a steep curve toward longer wavelengths. As described above, the wavelength (about 480 nm) when the maximum transmittance of the blue filter 93 having the above characteristics is exhibited.
4), ie, the wavelength at the peak of the transmission curve D shown in FIG.
5 nm), so that the sensitivity of the blue-sensitive layer of the printing paper P can be improved at the wavelength at the maximum transmittance of the blue filter 93. As a result, even if the light emission luminance of the CRT 4 is low, the exposure time for obtaining a desired bluish color density can be very short (in the present embodiment, C
Exposure is completed by causing the RT to emit light three times every 0.125 seconds. ),
Overall print generation time is greatly reduced.

The blue filter 93 of the filter section 9
Has a filter characteristic such that the transmittance curve D of the wavelength transmitted by the blue filter 93 draws a steep curve from the wavelength at the highest transmittance to a longer wavelength as shown in FIG. Therefore, as shown in FIG. 4, the wavelength at the maximum transmittance (shown by the transmittance curve D) of the blue filter 93 is longer than the wavelength at the conventional maximum transmittance (shown by the transmittance curve C). Even if it becomes blue system filter 93
Of the transmittance curve D of the green filter 92 and the transmittance curve B of the green filter 92 are small, and the transmittance of the blue filter 93 for the green wavelength can be extremely reduced. As a result, the transmission of light of a green wavelength is reduced when the light is transmitted by the blue filter 93, and the mixing of green when a blue image is formed is prevented. Things.

[0022]

According to the present invention, the blue filter in the filter section is changed so that the wavelength at the maximum transmittance of the blue filter is
Since it has a filter transmission characteristic that almost matches the wavelength at the spectral sensitivity peak of the layer that develops a blue color in the photosensitive material, the sensitivity of the blue sensitive layer of the photosensitive material at the wavelength at the maximum transmittance of the blue filter is Can be better. As a result, even if the light emission luminance of the CRT is low, the exposure time for obtaining a desired bluish color density can be extremely shortened, and the overall print generation time can be greatly reduced.

The blue filter of the filter section has a filter characteristic in which a transmittance curve of a wavelength transmitted by the blue filter draws a steep curve from a wavelength at the highest transmittance to a longer wavelength. By doing
It is possible to reduce the transmission of light of a green wavelength at the time of transmission through a blue filter, and it is possible to improve the blue color development without mixing green.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an exposure apparatus according to the present invention.

FIG. 2 is an explanatory diagram of a photographic processing apparatus having an exposure apparatus according to the present invention.

FIG. 3 is a graph showing light emission characteristics of a CRT used in the exposure apparatus according to the present invention.

FIG. 4 is a graph showing light transmission characteristics of a filter used in the present invention and a conventional exposure apparatus.

FIG. 5 is a graph showing spectral sensitivity characteristics of a photosensitive material used in the exposure apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exposure apparatus 4 CRT (light source) 5 CRT exposure means 9 Filter part 91 Red filter 92 Green filter 93 Blue filter P Printing paper (photosensitive material)

Claims (3)

[Claims] A light source for exposing image information to the photosensitive material, the light source being disposed between a light source and the photosensitive material;
And a filter unit having a red filter, wherein the blue filter in the filter unit has a wavelength at the highest transmittance of the blue filter at a spectral sensitivity peak of a blue color layer of the photosensitive material. An exposure apparatus having a filter transmission characteristic substantially matching a wavelength. 2. The blue filter of the filter section has a filter characteristic in which a transmittance curve of a wavelength transmitted by the blue filter draws a steep curve from a wavelength at the highest transmittance to a longer wavelength. 2. An exposure apparatus according to claim 1, wherein: 3. The exposure apparatus according to claim 1, wherein the light source of the exposure means is a monochrome CRT.