JPS5858527A - Blade made of plastics for optical instrument - Google Patents

Abstract

PURPOSE:To obtain blades made of plastics having excellent light shielding property, durability and antistatic properties with simple constitution by vapor depositing a thin film of black cermet on a blank material made of a polyester film. CONSTITUTION:A black pigment is mixed with a blank material 4 for blades consisting of a biaxially oriented polyester (polyethylene terephthalate) film, and a thin film of black cermet (for example, Cr2O3.Cr, SiO.Cr, etc.) 5 which is a composite material of ceramics and metals is vapor deposited thereon. Or a metallic film 6 is interposed between the film 4 and the film 5. Thus the blades made of plastics having excellent light shielding property, durability and antistatic properties are obtained with the simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic blade for optical machines, and more particularly to a plastic blade made of polyester film.

For example, the optical mechanical blades (shutter blades, diaphragm blades) used in kJN cameras cover the front surface of the photosensitive material and block light, so they must essentially have a light-shielding property, and the surface One blade must be black and matte because it must absorb light efficiently so as not to reflect it. Moreover, the feathers overlap each other in 7 pieces. vinegar,. It must have a good surface plane, excellent wear resistance, and antistatic ability.

This is particularly important for shutter blades that open and close rapidly.

Therefore, when selecting the material for the feather, taking into account this harsh usage environment, a metal sheet of about 50p to 100p was used for L)L, but based on the recent trend of stockpiling feathers, Some companies are beginning to offer blades made of blackened polyester film (alternatively, gold thread material).Polyvarnish 1 film is the best glass material used for this purpose. 4 has already been recognized.For example, JP-A-49-5402
This is stated in Publication No. 2.

However, conventional blades made of polyester film have sufficient light-shielding properties, but have poor light-absorbing properties due to surface reflection, so the surfaces have been roughened by sandblasting or the like. I also applied black matte 7 paint.

For this reason, conventional polyester film feather patterns have been inferior in terms of scratch resistance and durability. - In order to prevent static electricity, conventional blades are either coated with a conductive black pigment such as carbon or coated with an antistatic agent such as a common surfactant thread. It is sometimes attached to

However, is the conductivity of carbon etc. at 8 degrees, which exhibits an antistatic effect? Coatings made with 2I'X are susceptible to scratches, have the disadvantage of being harmful to others due to brush dust, and are poor in durability. In addition, the antistatic agent in general surfactant threads is not effective at low humidity1, has poor durability, and is particularly unsuitable for shutter blades that open and close by rubbing against each other at high speed.

Furthermore, conventional blades are resistant to light and heat (for example, when a camera is pointed at the sun, the light passing through the lens may be focused on a single point on the shutter blade, causing burnout of the shutter blade.
The property that this kind of burnout does not occur is called condensing heat resistance. ), a few microns of metal such as nickel or aluminum is deposited on the surface of a polyester film material by vacuum evaporation. For example, Jikoko 53
Publication No. 12192 discloses a shutter sleeve in which a metal film is vapor-deposited on the surface of a polyethylene terephthalate base material, and a light-shielding paint is applied thereon.

However, this method has the disadvantage that post-processing is a membership fee.

In other words, the light-condensing heat resistance can be obtained by vapor-depositing the gold powder, but the light absorption is low due to the surface reflection by the glazing film, so the surface is made matte by applying the colorless paint. Therefore, as mentioned in 011, scratch resistance,
It was inferior in terms of durability, and it was inferior in terms of process control because it required a separate deposition process for the vapor deposition process and the painting process.

The present invention has been made in view of the drawbacks of the above-mentioned conventional examples, and has light-shielding properties, light absorption properties, and b resistance with a simple structure and simple processing.
The purpose of the present invention is to provide a plastic blade that is excellent in durability, durability, and antistatic ability. achieved.

Furthermore, the object of the present invention can also be achieved by interposing a gold film between the polyester film material and the black cermet thin film.

Furthermore, the object of the present invention cannot be achieved by depositing a cermet thin film such that the composition ratio of ceramic to metal gradually changes in the bm direction.

The present invention will be explained below based on one embodiment shown in the drawings.

First of all, FIGS. 1 to 3 are plan views showing the shapes of a general shutter blade 11, a shutter blade (FI) 21 for a lens shutter, and a shutter blade 3 for a focal plane shutter, and FIG. FIG.

In the figure, reference numeral 4 denotes the material of the blade made of biaxially stretched polyester (polyethylene terephthalate) film, which has a black pigment mixed therein and has excellent light-shielding properties. However, in this case, excellent light-shielding properties are not an absolute requirement; 1. It is more preferable that the polyester film itself has light-shielding properties. This point also applies to other embodiments to be described later.

5 is a black color made of a composite material of ceramic and metal? Cermet thin film (for example, Or, 03.Cr, 5iO1IOr.

A I 203 IIM m..., etc.) and is deposited on the polyester film 4.

In the embodiment, the case where the length-knot thin film is deposited on only one side has been described, but it may be deposited on both sides.

Furthermore, processing method V (although it is limited to the vacuum evaporation 7fI method, and method 11 is classified as a physical vapor deposition method) may be an ion blating method that has a very dense layer property, or a reactive ion blating method. Ceramic may be deposited by vapor deposition, or furthermore, superstattering method or vapor phase vapor deposition method may be used.In this case, the surface of the polyester film may be subjected to mantle treatment in advance.

Furthermore, when depositing a cermet thin film, cermet, which is a composite material of ceramic and metal, may be placed as an evaporation source, or the ceramic and wire mesh may be placed separately to obtain a cermet thin film on the film surface. It's okay.

coconi, ceramics (e.g. Orz'Os, Sin.

A cermet film with an appropriate synthesis ratio of Al103, ..., etc.) and gold J@ (e.g. chromium Or) is black;
In addition, since it is readily electrically conductive, a plastic blade with excellent light-shielding properties, light-absorbing properties, and antistatic properties can be obtained without any other treatment.

Next, another invention will be explained based on FIG. 5, but the same configuration as that in FIG.

In part, 6 is a film of metal (eg chromium Or) deposited on the polyester film 4. Further, the black cermet thin film 5 is deposited on the edge of the metal.

Therefore, compared to the case where the cermet thin film 5f is vapor-deposited directly on the polyester film 4, firstly, the adhesion of the cermet thin film is improved and blades with light-shielding properties can be obtained immediately. It has the effect of producing a photothermal and quickly wetted feather. Of course.

If only the adhesion is to be improved, this metal film may be made 6 times thinner, but in order to improve the resistance to light-condensing heat, it must be made slightly thicker.

In other words, when the cermet thin film 5 is deposited directly on the polyester film 4 (Fig. 4), when sunlight is focused on the surface of the cermet thin film 5 during IJ, the light energy is exchanged and converted into thermal energy. The converted thermal energy is transmitted through the polyester film 4, causing local burnout of the polyester film 4.However, if the gold oval IM6 is interposed between them as in the present invention, the converted thermal energy is dispersed over a wide area by the gold J11I film 6, and the surface of the polyester film 4 is no longer locally heated.Therefore, the light-condensing heat resistance is improved.

Next, still another invention will be explained based on FIG.
The same configuration as in FIG. 4 is given the same charge, and the explanation of 1 charge is omitted.

1, 5' is a thin film made of 100% chromium cr
consisting of metal 7m (B), ceramic and chrome CR
It is composed of a ceramic layer (A) made of 100% ceramic ('A+B), which is a composite material of Cermet. As shown in FIG. 7, in the cermet layer I (A and B), the composition ratio of ceramic and chromium Or gradually changes in the film thickness direction so that the mf of the ceramic becomes rougher as the surface increases. Therefore, some of the layers have the composition ratio that the black cermet can obtain, and the other cermet layers and the ceramic J-
Since (A) is semi-transparent, when viewed from the direction of arrow X, it appears as if a black cermet layer has been deposited.

In other words, the composition ratio of ceramic and metal for a cermet thin film to be black is limited to a certain value (the tolerance range is narrow), and if the composition ratio is not appropriate, the cermet thin film will not be black. If configured in this way, a part of the cermet layer will always have this appropriate composition ratio, so there will be an effect that a black cermet layer will always be obtained.

Next, a method and apparatus for obtaining the thin film 5'' having the above-mentioned structure will be explained.

- Fig. 8 is a side view schematically showing the winding type vacuum evaporation apparatus 10, and in the figure 14 is a polyester film 4.
15 is a winding roll, 16 is a platen roll, 17 and 18 are shielding plates, 19° and 20 are heat sources, and P is a vacuum bonder. It should be noted that chromium (B) is evaporated from the heat source 19, and ceramic (A) is evaporated from the heat source 20, but the evaporation range is smaller than that of an insect.

Therefore, on the surface of the polyester film 4.

First, the chromium Cr evaporated from the heat source 19 is deposited, and the chromium Cr evaporated from the heat source 19 and the chromium chromium evaporated from the heat source 20 are simultaneously evaporated. The amount decreases as the film advances, and the amount of ceramic deposited increases as the film advances. ), and finally, the rk ceramic is evaporated from the heat source 20 to form a thin II film as described in FIGS. 6 and 7.
K51 is obtained.

The above is an explanation of the embodiment of the present invention, but it goes without saying that the present invention is not limited to this embodiment.

For example, in this example, the thin film was deposited directly on the polyester film 4, but as shown in FIG.
Although oxides such as 3 g Si OHA 1203 were used as an evaporation source for ceramics and treated in air, Or,
iMi, AI(r-old) may be treated in an oxygen gas atmosphere as an evaporation source.

Also in history, by extending ψ17 and 18 toward the [heat source] 9 and 2 (l), only the cermet thin film was evaporated in such a way as to block part of the chromium or ceramic evaporated from the heat source. You can also do it like this.

In other words, the metal layer (B) and ceramic in FIG.

A state in which the layer (A) does not exist may also be used.

As described above, according to the present invention, by depositing a black cermet thin film on the surface of a polyester film, light blocking properties, light absorption properties, and
By obtaining a plastic blade with excellent antistatic ability, scratch resistance, and durability, it is possible to improve the adhesion of the cermet thin film and to obtain a plastic blade with excellent light-condensing heat resistance. effective.

To the east, if the composition ratio of ceramic and metal in the cermet thin film is gradually changed in the layer thickness direction, the boome
The effect is that a part of the cermet thin film always has an appropriate synthesis ratio, and a black cermet thin film is always obtained.

[Brief explanation of the drawing]

Figures 1 to 3 are plan views showing the shape of a general blade, Figure 4 is an enlarged side sectional view of the blade according to the present invention, and Figure 5 is a plan view showing the shape of a general blade. FIG. 6 is an enlarged side sectional view of the blade 4ν, FIG. 6 is an enlarged side sectional view of a blade according to another invention, FIG. 7 is a graph showing the composite ratio of the blade in FIG.
The figure is a side view schematically showing the vacuum evaporation apparatus for surface treatment of the blade shown in FIG. 6. 4... Feather material made of polyester film, 5
...Black cermet thin film 51 ...Thin film, A
...Ceramic layer, B...Metal layer, A10B...Cermet+1*, 6...Metal layer, 10...Wind-up vacuum evaporation device, 14...Supply of polyester film 4 Roll, 19°20...Heat source 11 0 1 Fake thickness 0 Fig. 6 Fig. 8

Claims (3)

[Claims] (1) A plastic blade for optical machinery, characterized by having a polyester film material coated with black cermet pot coat, which is a composite material of ceramic and metal. (2) For optical machines, which is characterized by depositing Temet# film, which is a composite material of ceramic and metal, on a polyester film material such that the composite ratio of ceramic and metal constantly changes in the film thickness direction. plastic feathers. (3) A thin metal film is first vapor-deposited on a polyester film material [-1 a black length made of a composite material of ceramic and metal on top of it] - A plastic blade for optical machinery characterized by steaming a thin metal film. . (4) First, a thin metal film f# is placed on a polyester film material, and then a cermet thin film, which is a composite material of ceramic and metal, is evaporated so that the composite ratio of ceramic and metal gradually changes in the film thickness direction. A plastic vane for optical machinery characterized by having: