JPS6352128A - Apparatus for inspecting surface of photosensitive material - Google Patents

Abstract

PURPOSE:To surely detect the defect on the surface of a photosensitive material without generating fogging by the constitution in which the color change of the photosensitive material is detected by a photodetecting part for the visible light to scan the photosensitive material and the rugged defect is detected by a photodetecting part for IR light, respectively. CONSTITUTION:The visible light of a laser light source 10 and the IR light of a laser light source 12 are deflected by a rotary scanner 15 to scan photo graphic paper A on a roll 6. The diffuse reflected light thereof is detected in the photodetecting part 21 and the specular reflected light in the photodetecting part 22, respectively. Since the visible light of 550-635nm wave length is low in spectral photosensitivity, the fogging is not generated even if the defect 9 by the color change of the photographic paper is detected. Since the IR light has high safety of fogging, the S/N of the detection signal is im proved and the influence of noise is eliminated at the time of detecting the rugged defect 11 by using the light having the intensity several tens times the intensity of the light source 10. A filter 23 of the photodetecting part 21 is used to shut off the strong IR light.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of tF4 This invention relates to a photosensitive material surface inspection apparatus for optically inspecting defects occurring on the surface of a photosensitive material.

(Background of the Invention) As a surface inspection device, for example, there is one that optically places the surface of a color photographic paper horizontally.For a six-color photographic paper, an emulsion containing a light-sensitive dye is added to the base paper at the same time. J? +
It is then deoxidized. This multi-layer nine layers generally consists of a blue-sensitive regular layer that is sensitive to blue light, an edge-sensitive ortho layer that is sensitive to green light, and a red-sensitive pan layer that is sensitive to red light. It is laminated on the surface of a ship, and then a protective layer is applied to the surface, and spectral sensitization is performed.

By the way, f! There may be scratches on the first paper, fibrous substances may be attached to the base paper, and there may be air bubbles in the upper cloth emulsion. Due to these reasons, defects with color change and irregularities without color change occur on the surface of color photographic paper.

(Whether it's an invention or a point where it's trying to be scale-like) For this reason, visible light of relatively low sensitivity and low intensity is transmitted across the surface of color photographic paper, and color changes on the surface are detected. Defects can be detected by detecting changes in light intensity due to unevenness. By the way, since the intensity of visible light in the plate length region, where the sensitivity is relatively low, is low, the detection sensitivity is poor, and 21 tones may be generated in the detection signal for detecting changes in light intensity due to unevenness.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a photosensitive material surface calibration rA device that can accurately detect defects occurring on the surface of a photosensitive material without causing fog.

(Means for Identifying Problems) In order to achieve the above-mentioned object, the present invention uses a photosensitive material surface inspection device that deflects a light beam to run across the photosensitive material to detect defects in the photosensitive material. The photosensitive material is transferred using a light beam emitted from a light source and an infrared light source,
It is characterized by receiving reflected light and/or transmitted light of this light beam, detecting a change in color of the photosensitive material at a visible light receiving section, and detecting a 7f change in light intensity at an infrared light receiving section. .

(Function) In this invention, the surface of a photosensitive material is scanned with a light beam of visible light and infrared light, and the reflected light of the light beam and/or the transmitted light are received, and the color of the photosensitive material is colored by the visible light. Defects are detected by detecting changes and changes in the intensity of light caused by infrared light.

(χ Overwhelming) Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

The first section is a diagram showing the structure of color photographic paper and the spectral sensitivity distribution of each emulsion layer, and the second section is a diagram showing the spectral sensitivity distribution of color photographic paper.

The color photographic paper A is manufactured, for example, by simultaneously applying multiple layers of emulsion containing photosensitive dyes using a slide hopper method onto a base paper 1 that is transported at a predetermined speed. The multilayer emulsion layer formed by simultaneous multilayer coating on the Lr4 paper 1 in this way consists of a blue-sensitive regular layer 2 that is sensitive to blue light, an edge-sensitive ortho layer 3 that is sensitive to green light, and a red-sensitive ortho layer 3 that is sensitive to green light. Red sensitive bread Ig! ! 4 and further bread layer 4-hi! It consists of a protective layer I@5, each of which is spectrally sensitized.

The pan layer 4 is exposed to red light with a wavelength of 570 nm to 770 nm, and the ortho layer 3 is exposed to red light with a wavelength of 440 nm to 60 nm.
Sensitized with green light with a wavelength of 0 nm, the regular layer 2 is 35
It is sensitive to blue light with wavelengths from 0 nm to 510 nm, and is sensitive only to specific wavelength ranges.

Color photographic paper A with multilayer emulsion layers formed in this way
is dried in the next drying process, but when applying 'A' cross-linked photosensitive dye to the base paper 1, the Ikkyo paper itself may be scratched, or the Ikkyo paper 1 may have an Mll-like appearance. If something is attached to it or if there are air bubbles in the wiring, this will disturb the coloring agents of different colors contained in the regular layer 2, ortho layer 3, and bread layer 4, and the color stamp 11f1 paper The color of the surface of A changes and appears as a defect.

Further, the surface of the color photographic paper A may have uneven defects that do not change the color of the surface.

Detection of these defects occurring on the surface of color photographic paper A is as follows:
It is struck as shown in Figure i3.

Color mark I! III paper A is conveyed at a predetermined speed via a detection roll 6, and a rotary encoder 7 is provided on the detection roll 6. This rotary encoder 7 outputs conveyance pulses, and by counting these conveyance pulses, the conveyance speed of the color photographic paper A is detected, and a shutter drive No. 3 is sent to drive the shutter 8 to prevent fogging. .

This light source 10 uses a 632 nm He-Ne laser as a light source 10 for detecting color change defects 9 existing on the surface of color photographic paper A.
It includes a laser and uses visible light with a wavelength of 550 nm to 635 nm. As shown in Figure 2, visible light in this range d is in the @ range where the spectral sensitivity is relatively low, and color photographic paper A
It is set to be weak enough not to cause fogging when the surface of the color photographic paper A is scanned to detect the color of the emulsion layer appearing on the surface of the color photographic paper A.

In addition, as a light source 12 for detecting uneven defects 11 on the surface of color photographic paper A with no color change, a wavelength of 780 nm is used.
Infrared light from a single conductor laser of 830 nm or 830 nm is used. This infrared light also includes near-infrared light, and since these are highly safe against fogging, a light source with an intensity several tens of times or more stronger than the light fL10 can be used.

The light from the light source 10 is attenuated by an ND filter 13, and together with the light from the light source 12 reflected by a mirror 14, is deflected by a rotary scanner 15 and scanned onto the surface of the color photographic paper A via an Fe lens 16. At this time, ND filter 1
The power monitor 17 receives the reflected light from the ND filter 13 and detects an abnormality in the ND filter 13. If an abnormality occurs, the shutter 8 is closed to prevent fogging. Further, the light reflected by the rotary scanner 15 is detected by a scanner rotation detection sensor 18, thereby detecting the rotation speed of the rotary scanner 15, and if the rotation speed is decreasing, the shutter 8 is closed.

A mirror 19 is provided between the rotating scanner 15 and the detection roll 6.
The spot origin detection sensor 20 detects the origin of the scanning beam and corrects the relative fluctuation of the scanning beam from the one-rotation scanner 15 for each scan.

Diffuse reflection light from the scanning beam is received by a diffuse reflection light receiving section 21.
The specularly reflected light is received by the specularly reflected light receiving section 22 . A filter 23 is arranged on the light-receiving surface side of the diffuse reflection light-receiving section 21 to communicate visible light and block infrared light.

Since the light source 12 has a higher original intensity than the light source 10, a filter 23 is arranged to suppress infrared light from entering the diffuse reflection light receiving section 21.

The diffuse reflection light receiving section 21 and the specular reflection light receiving section 22 each house a plurality of photomultis that are operated by a high-voltage power supply and convert light into electricity, and a preamplifier disposed at the next stage for amplification. As shown in FIG. 4, the outputs of the plurality of preamplifiers are summed by a converter amplifier 24, and then a detection signal 26 is outputted through a bypass filter 25 in order to eliminate only the defective portion.

For example, if there is a defect 9 due to color change on the surface of color photographic paper A, regular layer 2. The color viewing rules for the different colors contained in the ortho layer 3 and the pan layer 4 are disturbed, and the surface color changes. When light hits this defective part 9, the diffusely reflected light of this reflected light is received by the diffusely reflected light receiving part 21, and defect detection No. 43 27 is expected from the change in color.

Further, when there is an irregular defect 11 on the surface of the color photographic paper A, specularly reflected light of the reflected light is received by the specularly reflected light receiving section 22, and a defect detection signal 28 is obtained from the change in the intensity of the light.

Since the light received by the specular reflection light receiving section 22 is infrared light output from the semiconductor laser light source 12, no fogging occurs on the color photographic paper A. Moreover, since this infrared light has a high intensity, the change in the light due to the unevenness defect 11 becomes large, the S/N ratio of the detection signal 26 is improved, and the influence of noise can be removed.

Note that this example describes color photographic paper A, and is also applicable to defect detection in photosensitive materials such as color film.
It is Noh. Further, detection may be performed using diffusely reflected light and specularly reflected light, or transmitted light may be used instead of such reflected light.

(Effects of the Invention) As described above, the present invention deflects a light beam of visible light and infrared light to travel across the surface of a photosensitive material, and receives reflected light and/or transmitted light of this light beam. Since defects are detected by detecting changes in the color of the photosensitive material due to '-T visual light and changes in the intensity of light due to infrared light, it is possible to measure defects and irregularities due to color changes on the surface of the photosensitive material. Defects can be detected reliably without causing fog on the photosensitive material and by eliminating the effects of miscellaneous perspiration.

[Brief explanation of drawings]

The first section is a diagram showing the structure of color photographic paper and the specific sensitivity of each emulsion layer, Figure 2 is a diagram showing the spectral sensitivity of color photographic paper, and Figure 3 is a schematic diagram of a surface horizontal orientation device for color photographic paper. FIG. 4 is a circuit diagram for obtaining a defect detection signal for color photographic paper. A-・Color photographic paper 1-・Base paper 2・-・Regular layer 3-・Ortho layer 4j-Pan layer 9.11-1 defect 10.12・=Light source 14-Reflection mirror 15-One rotation scanner 21-Diffuse reflection light reception Part 22 - Specular reflection light receiving part 23 - Filter Fig. 4

Claims (1)

[Claims] In a photosensitive material surface inspection device that scans a photosensitive material by deflecting a light beam to inspect the photosensitive material for defects, the photosensitive material is scanned with a light beam output from a visible light source and an infrared light source. , by receiving the reflected light and/or transmitted light of this light beam, the visible light receiving section detects a color change of the photosensitive material, and the infrared light receiving section detects a change in the intensity of the light. Photosensitive material surface inspection equipment.