JPH0451126A - Eye hood - Google Patents

Abstract

PURPOSE:To surely combine an eye hood with a camera main body by constituting a hood part of a thermoplastic elastic body composition and a base part of hard resin and thermally melt-sticking both of them. CONSTITUTION:As to the hard resin and the thermoplastic elastic body which is rich in elasticity, polyethel block amid is contained in the latter elastic body. An eye piece part 3 is formed of the thermoplastic elastic body and has such a shape that unnecessary light is prevented from entering by contacting with a face when the eye hood 2 is held against the face. A pawl piece 5 is provided on the outer periphery of the base part 4 made of the hard resin. One end of the pawl piece 5 is calked by a projection 6 obtained by extending the base part 4 and attached, and the tip of the other end is bent to the outside so as to form a pawl 7. As a result, the eye hood is formed by integrating the hard resin which is the material of the base part directly abutting the camera, etc., with the thermoplastic elastic body which is the material of the hood part and rich in the elasticity. Thus, the base part of the eye hood is directly attached to the camera main body and the eye hood is surely combined with the camera main body.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an eye hood, and more particularly, to an eye hood in which the hood part is made of a thermoplastic elastic material and the base part is made of a hard resin, both of which are heat-sealed. More particularly, the present invention relates to an eye hood whose base portion has means for attaching it to a camera body.

[Prior Art] Conventionally, cameras, microscopes, binoculars, and the like have been equipped with an eye hood on the part that comes into contact with the face, that is, the eyepiece part. The purpose of this eye hood is to allow cameras and other objects to softly hit the face, and to block sunlight from entering the field of view. Furthermore, it is said to be used to alleviate the cold discomfort that comes directly from the camera. For this reason, eye hoods are made of flexible resin (such as thermoplastic elastic material) that is flexible and rich in rubber elasticity.

When attaching this eye hood directly to the camera body, etc., the soft resin is too soft, so fixing methods such as screwing, fitting, and bayonet joints cannot be used. However, it was not durable enough for use. This is because of the following reasons. When bringing your eyes close to the camera and making contact, if you bring your eyes exactly straight, the eye hood will receive the compression force properly.
Also, if approached from an angle, bending force will be applied. Next time, if you shake the camera a little forcefully from side to side while still in contact, a torsional shearing force will be generated on the eye card.

In some cases, it may also have a narrowing effect.

In other words, since the part where the soft resin is connected to the camera body is subjected to various stresses, it is necessary to have a bonding force that can withstand such stress. However, that was not always enough. For this reason, the eye foot itself was once held and fixed with a hard resin or metal member, and then attached to the camera body. That is, the camera body is attached by providing a means for fitting the camera body into a hard resin or metal member. Another method was to attach the eye hood by pressing it entirely into the camera body.

However, due to the various stresses mentioned above,
The parts that were gripped and pressed were overworked, and there were not many gaps, causing looseness and misalignment, resulting in a lack of durability. In particular, when it is mounted by pressing down, a holding member must be provided on the camera body side, which inevitably complicates the mounting means and increases the number of man-hours required for assembly.

[Problems to be Solved by the Invention] This invention has been made as a result of intensive research to solve the above-mentioned problems. In other words, the eye hood is made of a soft resin part rich in rubber elasticity (mainly thermoplastic elastic body).
It consists of a hood part made of a hood part, and a dimensionally stable base part made of a hard part (hard resin), and the base part is attached to the main body of a camera or the like.

Since the eye hood itself is provided with an attachment means for connecting it to the camera body at its base, there is no longer a need for a gripping member or a presser as in the past, and the eye hood can be easily attached. The hard resin base is dimensionally stable and not soft, unlike soft resins that are rich in rubber elasticity, so it can be connected to the camera body without any distortion.

On the other hand, when a soft resin and a hard resin are conventionally heat-sealed, there has been a problem in the adhesive strength. In other words, the adhesive strength is low,
In particular, the adhesion between a thermoplastic elastomer made of a synthetic resin with excellent rubber elasticity and a hard resin was extremely poor, and sufficient bonding strength could not be guaranteed.

In the present invention, when bonding a soft resin and a hard resin, when thermally fusing a thermoplastic elastomer with excellent rubber elasticity and a hard resin, the material in the thermoplastic elastomer (
As a result, it was found that blending a thermoplastic elastomer (polyether block amide or polyester thermoplastic elastomer) would result in extremely strong adhesion between the two, and it was found that this material could be used in camera hoods to improve the bond between the thermoplastic elastomer and the hard resin. This is what I did. They came up with the idea that by attaching the hard resin base directly to the camera, they could securely connect it to the camera body.

[Means to solve the problem] The present invention will be explained in detail below.

The greatest feature of the present invention is that polyether block amide is contained in the hard resin and the highly elastic thermoplastic elastomer in order to strongly improve the adhesion between the latter. This is because it contains a polyester thermoplastic elastomer.

As a result, we were able to create an eye hood by integrating the hard resin that makes up the base, which comes into direct contact with the camera, and the highly elastic thermoplastic material that makes up the hood.

This made it possible to attach the base of the eye hood directly to the camera body, making it possible to securely connect it to the camera body. Polyether block amide or polyester thermoplastic elastomer is represented by the following formulas (1) and (2).

A block of polyamide is shown that is a PA nihard segment.

PE: indicates a block of polyether which is a segment.

The polyether block amide represented by the general formula (1) is, for example, a) a salt of cyamine and dicarboxylic acid, lactams, or a polyester such as aminocarboxylic acid (PAi 14 component), four-component lyoxyethylene glycol, polyoxypropylene glycol, etc. Oxyarnelene glycol (PE component) c) It is a well-known product prepared by polycondensing dicarboxylic acids.

It is still not clear why the polyether block amide represented by the general formula (1) strongly adheres to hard resins, but the hard segment, soft segment, and functional groups such as 01-1 and C00H of the polyether block amide It can be assumed that this is the result of effective interaction between the two.

-a The polyester thermoplastic elastomer represented by formula (2) is prepared by polycondensation reaction and transesterification reaction using dimethyl terephthalate, 1゜4-butanediol, and poly(oxytetramethylene) glycol as starting materials. be done.

Note that polyester thermoplastic elastomers are hard (
It has a hard segment and a soft segment. This type of polyester thermoplastic elastomer includes polyester segments (hard segments) prepared from aromatic dicarboxylic acids and short chain glycols, and polyester segments (hard segments) prepared from aromatic dicarboxylic acids and polyalkylene glycols (long chain glycols). Polyether with ether segment (soft segment)
There are ester type copolymers. Polyester-ester type copolymers prepared using polypropylene as soft segments are also known.

On the other hand, it is still unclear why the polyester thermoplastic elastomer represented by general formula (2) strongly adheres to hard resins, but like polyether block amide, the hard segment and soft segment of the polyester thermoplastic elastomer It can be inferred that this is the result of the effective interaction of functional groups such as , OH and COOH.

Next, the thermoplastic elastomer to be combined with polyether block amide or polyester thermoplastic elastomer I.mer will be explained. The thermoplastic elastic body used for the hood in the present invention may be any flexible resin that has rubber elasticity and flexibility.

Examples include hydrogenated SBS block polymers, olefin elastomers such as FPR, diene elastomers such as SBR, urethane elastomers, and highly elastic plastic polyvinyl chloride blended with plasticizers. In particular, in order to obtain an eye hood with high added value, it is desirable to use a thermoplastic elastic body having a hardness (JIS Shore hardness A) of 70 to 35 degrees.

In order to prepare a thermoplastic elastomer composition with excellent heat fusion properties from the above-mentioned polyether block amide or polyester thermoplastic elastomer I-mer and the thermoplastic elastomer component, it is necessary to ensure sufficient fusion bonding strength. From the viewpoint of
25 to 185 parts by weight are used. Particularly preferably, 40 to 40 parts of polyether block amide or polyester thermoplastic elastomer are used per 100 parts by weight of the thermoplastic elastomer.
A mixture is used in which 60 parts by weight are mechanically blended and uniformly dispersed in a sea-island pattern.

The hard resin used for the eye hood base of the present invention is a thermoplastic engineering plastic or thermoplastic synthetic resin such as polycarbonate, nylon 11, nylon 12, ABS/resin, and methacrylic resin. Among these synthetic resins, those having a hardness of 70 or higher may be used in order to obtain eye hoods with high added value.

[Example 1] Hereinafter, it will be explained according to an example.

FIG. 1 is a diagram showing an overview of the video camera 1, FIG. 2 is an overview diagram showing the means for attaching an eye hood, and FIG.
The figure is a sectional view thereof. The eyepiece part 3 is made of thermoplastic elastic material and has a shape so that the eye hood 2 comes in close contact with blood removal when applied to the face to prevent unnecessary light from entering. The base 4 is made of hard resin such as engineering plastic. Claw pieces 5 are provided on the outer periphery of the base 4 made of hard resin. One of the claw pieces 5 is attached by caulking with a protrusion 6 from which the base 4 extends, and the other end is bent outward to form a claw 7.

The claw piece 7 is attached to the base 4 by being caulked, and since it expands outward from the caulking part in an elastic manner, it is screwed in while rotating along a threaded part 11 carved into the main body 10 of the camera or the like. The attachment strength between the main body 10 of a camera or the like and the eye hood can be freely selected depending on the strength of the elastic force of the claw piece 5. Here, the claw piece 5 is provided on the eye hood 2 side and the threaded part 11 is provided on the main body 10 of the camera, etc. However, it is also possible to reverse this and provide the threaded part 11 on the eye hood side and the claw piece 5 on the main body 10 of the camera etc. good.

Also, although the camera side has an internal thread, it is of course possible to use an external thread. The adhesive part between the thermoplastic elastic eyepiece part 3 and the hard resin base part 4 is heat-sealed, but by providing a protrusion on one side and a recess 8 on the other and fitting them together and heat-sealing them, the bonding area can be reduced. becomes larger, allowing for stronger adhesion.

[Embodiment 2] FIG. 4 shows another attachment means. A rail portion 17 is provided on the inner circumferential surface of the base portion 4 made of hard resin, and a notch portion 15 is provided for inserting a protrusion portion 16 on the camera body side. The camera body also has a protrusion 16 . To fit the eye hood 2 into the camera, use the protrusion 16 on the camera body.
After the base 4 of the hood 2 is pushed in by bringing the notch 15 of the base 4 into contact with a location corresponding to , the protrusion 16 is slid along the rail portion 17 by rotating it.

Normally, the inner grooves of the rail portion 17 have tapered intervals, so that they tighten as the base portion 4 rotates. Such a bayonet connection is mutually interchangeable, so a cutout 15 is formed on the camera body and a protrusion 16 is formed on the base 4 of the other eye hood 2.
It is the same even if each is provided.

Although the above description has been made regarding eye hoods for cameras, etc., the present invention is not limited thereto, and includes lens hoods,
It can also be applied to lens caps, etc. Below, as a reference example, the results of an experiment in which a hood part of a thermoplastic elastomer composition and a base part of a hard resin were thermally fused are shown.

[Reference Example 1] Next, a reference example is shown below in which an eye hood is molded by thermal fusion of a hood part made of a thermoplastic elastic body and a base part made of a hard resin.

A thermoplastic elastomer composition was prepared as follows.
100 parts of Mitsubishi Yuka Co., Ltd.) and polyether block amide (registered trademark name [Pebax J 6333]
55 parts of SAOO1 SP value 10.2 to 10.8, manufactured by Toshi Co., Ltd.) were uniformly blended to obtain a blend in which both components branched into sea-island shapes.

An experiment was conducted in which the thermoplastic elastomer composition prepared as described above was thermally fused to a polycarbonate molded article to form a composite body.

That is, the main body of the underwater goggles is made of polycarbonate by injection molding in advance, and then the above-mentioned thermoplastic elastomer composition is heat-sealed and bonded to the main body of the underwater goggles made of polycarbonate by injection molding means to form the face contacting part. Formed. (
The overall structure of the underwater goggles is described in Japanese Patent Publication No. 62-23577. ) The injection molding conditions are: nozzle temperature 220°C, cylinder temperature 180°C, die bottom temperature 140°C, mold temperature 5.
The temperature was 0°C and the injection pressure was 400 kg/cm2.

The bonding surfaces of the polycarbonate and the thermoplastic elastomer composition were strongly adhesively fused. The adhesive strength was the same as the tensile strength of the thermoplastic elastomer. That is, the polycarbonate and 5-E-B.S were completely fused together.

Under the same conditions as described above, 100 parts of thermoplastic elastomer and 25 parts and 185 parts of polyether block amide were bonded completely, respectively.

[Reference Example 2] In the examples, TPO (olefinic thermoplastic elastomer I-mer), (trademark registered name "
When heat fusion was carried out using a 503ON (Mirasu) Mar, +503ON, manufactured by Mitsui Petrochemical Industries, Ltd., the bonded surfaces were completely fused and bonded.

[Reference Example 3] In Example 1, instead of 5-E-B・S, styrene-
When a thermoplastic elastomer composition is prepared using butadiene-styrene (SBS, trade name: Elastomer A RJA R140, manufactured by Aron Kasei Co., Ltd.) and fusion bonded, the bonded surfaces are completely fused. Joined.

[Reference Example 4] In Reference Example 1, a thermoplastic elastomer (trade name "Aron ARJ74013K, manufactured by Aron Kasei Co., Ltd.) was used instead of 5-E-B-3 to prepare a thermoplastic elastomer composition and fusion bonded. When bonded, complete fusion bonding was performed on the bonded surfaces.

[Reference Example 5] In Example 1, ABS was used instead of polycarneton.
Resin (acrylonitrile-butadiene styrene resin)
, <Trade name [Denka ABS.

When fusion bonding is performed using GR-1000 (manufactured by Denki Kagaku Kogyo Co., Ltd.), the bonding surface must be fusion bonded with sufficient strength.

[Reference Example 6] In Example 1, when methacrylic resin (trade name "Acrylic Vera 1~", manufactured by Mitsubishi Rayon Co., Ltd.) was used for fusion bonding instead of polycarbonate, the bonded surface had sufficient strength. It was fused and bonded with.

[Reference Example 7] Instead of the polycarbonate of Example 1, a pre-molded mechanical part made of 11-nylon was placed in a mold. Other conditions were the same as those of the actual mpAi, and a polymer blend of the same thermoplastic elastomer and polyether block amide was injection molded and fusion-bonded. The joint surfaces were completely fused.

"Reference Example 8" In Example 7, when 12 nylon was used instead of 11 nylon for fusion bonding, the bonded surfaces were completely fusion bonded.

In addition to the above, in the above References N1 to 8, polyether block amide (registered trade name "Bebax+6333S")
A polyester thermoplastic elastomer I-mer (registered trade name "Glilux" E-120, manufactured by Dainippon Ink and Chemicals Co., Ltd.) was used instead of AOO1SP value 10.2 to 10°8 (manufactured by Toshi Co., Ltd.). Experiments were also conducted in both cases, and in all cases, fusion bonding was performed at a sufficient temperature.

Up to now, the explanation has been made regarding eye hoods for cameras, etc., but the present invention is not limited thereto, and can also be applied to lens hoods, lens caps, and the like.

[Effects of the Invention] The present invention provides an eye hood that is composed of a hood part made of a soft part (thermoplastic elastic body) with high rubber elasticity and a dimensionally stable base part made of a hard part (hard resin). The base of the eye hood has a structure that attaches directly to the main body of the camera, etc., and the base of the eye hood itself has an attachment means for connecting it to the main body of the camera, etc., so there is no need for gripping members or holding members as in the past, making it easy to use. Installation became easy. In addition, there is no possibility that the gripped or pressed portion will be overworked and the gap will become wide, resulting in looseness or slippage. Furthermore, the base of the hard resin is dimensionally stable and does not become soft unlike the soft resin which is rich in rubber elasticity, so that it can be connected to the camera body without any distortion.

On the other hand, the heat fusion between the hood part of the thermoplastic elastomer composition and the base part of the hard resin is extremely strong due to the blend of polyether block amide or polyester thermoplastic elastomer and thermoplastic elastomer. Therefore, sufficient durability is guaranteed even if the eye hood is subjected to the various stresses mentioned above.

[Brief explanation of drawings]

Fig. 1 shows an overview of the video camera, Fig. 2 shows an overview of the eye hood, Fig. 3 is a partial sectional view of Fig. 2, and Fig. 4 shows the eye hood of the second embodiment. It is a diagram. 1...Video camera, 2...Eye food, 3...
Eyepiece, 4...Base, 5...Claw piece, 6...Protrusion Patent applicant: Taisei Plus Co., Ltd. Agent: Moto Tomisaki Acid No. 2?

Claims (1)

[Claims] 1. An eye hood in which the hood part is made of a thermoplastic elastomer composition and the base part is made of a hard resin, both of which are joined by heat fusion. 2. The eye hood according to claim 1, wherein the joint surfaces of the hood part made of the thermoplastic elastomer composition and the base part made of the hard resin are fitted into each other. 3. The eye hood according to claim 1 or 2, wherein the base has means for attaching to the camera body. 4. The eye hood according to claim 1, wherein the thermoplastic elastomer composition contains polyether block amide. 5. The eye hood according to claim 1 selected from Claims 1 and 2, wherein the thermoplastic elastomer composition comprises a) 100 parts by weight of the thermoplastic elastomer and b) 25 to 185 parts by weight of polyether block amide. 6. The eye hood according to claim 1, wherein the thermoplastic elastomer composition contains a polyester thermoplastic elastomer. 7. In one item selected from claims 1, 2, and 3, the thermoplastic elastomer composition is a) thermoplastic elastomer 100 parts by weight b) polyester thermoplastic elastomer 25 to 185 parts by weight
Eye food consisting of a weight section.