JPS6391620A - Production of rock crystal optical low pass filter - Google Patents

Abstract

PURPOSE:To improve the accuracy of outside measure and to obtain a uniform side face part by sticking a black resin film for preventing flare to the side face part before a bleeding part of an adhesive agent cures to lose the adhesive effect. CONSTITUTION:Glass 7 for color correction is disposed so as to be held in place between rock crystal veneers 6, 8 cut in the bearing where a double refraction effect is obtainable. The optical adhesive agent 9 is applied between such rock crystal veneers 6, 8 and the glass 7 for color correction and the veneers and the glass are stuck to each other. The black resin film 10 which is preliminarily prepd. and has the size conforming to the size in the side face part of a rock crystal optical low pass filter constituted by sticking the veneers 6, 8 and the glass for color correction to each other is stuck to the circumference of the side face part by utilizing the adhesive agent 9 bleeding onto said part, by which the rock crystal optical low pass filter is obtd. The considerable rationalization of the stage is attained by sticking the film 10 to the outer side face by utilizing the adhesive agent 9 bleeding at the time of sticking the veneers 6, 8 and the glass 7 before curing.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method of manufacturing a crystal optical locus filter for use in video cameras and the like.

Conventional technology Conventionally, as shown in FIGS. 5 and 6, crystal single plates 1 and 3 cut in a direction that produces a birefringence effect and a color correction glass 2 are bonded together with an optical adhesive 4. After removing the protruding portion 4' of the optical adhesive 4 that occurs during the work process, the side surface is removed to prevent flare caused by internal reflection at the side surface, as shown in FIGS. 7 to 9. A black resin adhesive 5 was applied to the surrounding area.

Problems to be Solved by the Invention However, in the conventional manufacturing method described above, variations occur in the outer peripheral dimensions of the crystal optical low-pass filter, and it is difficult to obtain a uniform surface on the side surface. In addition, in order to obtain the outer periphery dimensional accuracy of the crystal optical low-pass filter and to obtain a uniform surface on the side surface, the work process of wiping off the protruding part of the optical adhesive 4 before curing or scraping it after curing is performed in a process other than this work process. The problem was that it was necessary as ancillary work.

The present invention is intended to solve these conventional problems, and aims to provide an excellent crystal optical low-pass filter that eliminates incidental manufacturing work and has uniform side surfaces with high dimensional accuracy. It is something to do.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides that during the bonding process of a crystal optical low-pass filter, in which a plurality of crystal single plates and color correction glass are optically bonded, a This method is characterized in that a black resin film is attached using the resulting optical adhesive extrusion.

Therefore, according to the present invention, the flare-preventing black color is applied before the protruding portion of the adhesive that occurs when bonding a plurality of quartz single plates and color correction glass together with an optical adhesive hardens and loses its adhesive effect. By pasting the resin film, the conventional incidental work of wiping off the protruding adhesive and scraping is omitted, and it has the effect of improving the accuracy of the outer circumferential dimension and obtaining a uniform side surface, while at the same time improving the accuracy of the conventional This also has the effect of omitting the work of applying a black resin adhesive for preventing flare.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the accompanying drawings FIGS. 1 to 4.

First, in FIG. 1, a color correction glass 7 is placed between quartz single plates 6 and 8 which are cut in a direction that provides a birefringence effect, and the color correction glass 7 is sandwiched between the quartz single plates 6 and 8 and the color correction glass 7. Apply optical adhesive 9 between 7 and bond them together, and use the optical adhesive 9 that protrudes around the side surfaces to attach the crystal single plates 6 and 8 prepared in advance and the color correction glass. A quartz optical low-pass filter is obtained by laminating a black resin film 1° having dimensions matching the side surface dimensions of the quartz optical low-pass filter constructed by laminating the quartz crystal optical low-pass filter.

In this way, when pasting the crystal veneers 6 and 8 and the color correction glass layer, the optical adhesive 9 that protrudes out before curing is used to paste the flare prevention black resin film 1o on the outer surface. 2 to 4, resulting in a crystal optical low-pass filter as shown in FIGS. 2 to 4.

Effects of the Invention Since the present invention manufactures a crystal optical low-pass filter by the method described above, in the manufacture of the crystal optical low-pass filter, after combining and laminating a plurality of crystal single plates and color correction glass, When applying black resin adhesive to prevent flare, this method eliminates the work of wiping or scraping off the adhesive that protrudes from the side surface when bonding, and at the same time eliminates the work of applying black resin adhesive to prevent flare. It will be omitted.

Furthermore, the manufacturing method according to the present invention makes it possible to obtain a crystal optical low-pass filter having a uniform side surface with high precision in outer circumferential dimensions, which has an extremely excellent effect of simplifying the equipment for a video camera, etc., and producing high-quality images. It is an invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the method for manufacturing a crystal optical low-pass filter of the present invention, and FIGS. 2 to 4 are perspective views, sectional views, and front views of the crystal optical low-pass filter obtained by the same method. 5 and 6 are a perspective view and a plan view of the conventional example after bonding, and FIGS. 7 to 9 are a perspective view, a sectional view, and a front view of the completed product of the conventional example. 6.8... Crystal single plate, 7... Color correction glass, 9... Optical adhesive, 1o...
・Black resin film. Figure 1 Figure 2 Figure 3 Figure 4'. q

Claims (1)

[Claims] When combining multiple crystal single plates and optical glass and optically bonding them, a flare-preventing black resin film is pasted on the outer side of the crystal optical filter made of the single crystal single plate and optical glass using an optical adhesive that protrudes from the outer side. A method for manufacturing a crystal optical low-pass filter.