JPH04128701A - Optical transmission body array and production thereof - Google Patents

Abstract

PURPOSE:To obtain a uniform resin film which has a good arranging property and is free from warpage by arranging and inserting plural pieces of short-sized rod-shaped lenses in parallel via hot melt type adhesives between two sheets of substrates. CONSTITUTION:Plural pieces of the short-sized rod-shaped optical transmission bodies are arranged between two sheets of the substrates and are joined and pinched therebetween via the hot melt adhesives. The short-sized rod-shaped optical transmission bodies to be used are exemplified by optical fibers and distributed index type rod-shaped lenses, of which the distributed index type rod-shaped lens made of plastics are more particularly preferable. Various substrates, such as glass epoxy FRP plates, carbon fiber reinforced ABS resin plates or AS resin plates, and liquid crystal polyester resin plates, are used as the substrates for pinching the arranged matter of the short-sized rod-shaped optical transmission bodies. V-shaped hollow grooves and U-shaped hollow grooves for improving the parallel arranging property of the rod-shaped optical transmission bodies are preferably previously provided on the inside surfaces of such substrates. The uniform resin film which has the good arranging property and is free from the warpage is obtd. in this way.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a short rod-shaped optical transmission body, particularly a gradient index rod-shaped lens f: an optical transmission body in which a large number of rod-shaped lenses f are arranged in parallel between two substrates and bonded and sandwiched. The present invention relates to a method for manufacturing a body, and in particular, to a method for manufacturing a smooth optical transmission body array.

[Conventional technology]

A light transmitting body array in which a large number of gradient index rod lenses are arranged in parallel between two substrates and sandwiched therebetween is usefully used as a picture image transmitting body in a copying machine, especially a dry type copying machine.

As shown in Japanese Unexamined Patent Publication No. 61-55610, this optical transmitter play has a spacer provided between two substrates, and a large number of short graded index rod lenses arranged in parallel between the spacers. After the two substrates are closed, a VK curing type liquid adhesive is filled between the rod-shaped lenses arranged in parallel, and the adhesive is cured.

[Problem a that the invention attempts to solve]

The conventional method for manufacturing an optical transmitter array as described above has the drawbacks that the process is complicated and it is difficult to increase the degree of parallel alignment of the silica lenses, and the manufacturing process is also long, resulting in high manufacturing costs. Ta.

[Means to solve the problem]

Therefore, the Ministry of the Invention and other organizations are currently considering ways to solve the above-mentioned problems, and have found that they may be able to achieve this goal by using a hot-melt adhesive as the adhesive for fitting the rod-shaped original transmitter. The present invention was completed based on the discovery that a plurality of short rod-shaped light transmitting bodies are arranged between two substrates and bonded using a hot-melt adhesive. The present invention relates to an optical transmitter array characterized by a layered structure.

Examples of the short rod-shaped light transmitting body used in carrying out the present invention include Gengaku-wadori fibers and refractive index distribution type rod-shaped lenses. Rate distribution type rod-shaped lens, Japanese Patent Publication No. 56-57521, Japanese Patent Publication No. 57-29682, Japanese Patent Publication No. 2-25482, Japanese Patent Publication No. 62-21
A gradient index rod-shaped lens with a glass crack as shown in Japanese Patent No. 5204 is preferred.

As the substrate on which the array of short rod-shaped light transmitting bodies is sandwiched, a variety of substrates can be used, such as a glass epoxy FRP plate, a charcoal fiber-reinforced AB8 resin plate, an As fat-reinforced plate, a liquid crystal polyester resin plate, etc. It is preferable to provide a V-shaped concave #JPU-shaped concave groove on the inner surface of the tube for parallel arrangement of the rod-shaped light transmitting bodies.

Hot-melt type contact 7 used in carrying out the present invention
As a single agent, those that melt when heated to 60 to 100C and exhibit fluidity of about 500 to 1000 sp are called thermoplastic a hot melt adhesives and frame m type hot melt adhesives. Any of the agents can be used. In particular, since the optical transmitter array of the present invention is often exposed to a thermal atmosphere in a copying machine, it is preferable to use a cross-linking hardening type hot-melt type adhesive 7iiF as the adhesive. In this case, it is preferable to use a material that does not melt in the bath when exposed to temperatures of 1,000 or higher. Examples of these adhesives include polyester adhesives, EvA adhesives, etc., and examples of crosslinking hot melt adhesives include ultraviolet and electron beam curing types, thermosetting types, and urethane moisture curing adhesives. Examples include molds, silane-based moisture curing types, oxygen curing types, and the like.

The adhesive may be used in the form of powder, nonwoven fabric, film, fiber, or the like.

To make the optical transmitter array of the present invention, adhesive is applied to two substrates in advance, short rod-shaped optical transmitters are arranged between them, the two substrates are closed, and hot-pressed from the outside of the substrates. , a method of bonding and sandwiching these together, or a method of sandwiching a rod-shaped light transmitting body sheet in which short rod-shaped light transmitting bodies are bonded in advance with a hot-melt type adhesive, cut into perfect lengths, between two substrates. Examples include a method of hot pressing to form the optical transmission body array of the present invention.

If the optical transmitter play of the present invention is made only by the hot pressing method, it is also undesirable that the optical transmitter array may be deformed while being left alone. In order to prevent such deformation of the optical transmitter array, following the hot pressing of the optical transmitter array, cold press processing of 0S40C' is performed immediately to fix the shape of the optical transmitter array. It is preferable to leave it there.

Since the optical transmitter array of the present invention uses a hot-melt adhesive to bond the optical transmitters and the substrate, it is easier to manufacture than conventional methods, and the parallel arrangement of the optical transmitters is improved. It can be improved. In particular, products employing hot press processing and cold press processing as the manufacturing method have a characteristic of extremely good shape retention.

The present invention will be explained in more detail with reference to Examples below.

〔Example〕

The short optical transmission body used in Examples and Comparative Examples had a diameter of 925μ.
m1 refractive index distribution foot number 0.54111 center refractive index 1.
515 lens, and the adhesive is cross-linked hot melt adhesive Nisdyne? 606 (manufactured by & Mizu Kagaku Kogyo Co., Ltd.) t- was used. The substrate used was an ABS resin Ts-ss-xlooo (manufactured by Mitsubishi Rayon Co., Ltd.) with a 930 μm pitch U groove. U used for surface treatment of optical transmitter array after cutting both ends
”/The cured resin solution contained 15 parts by weight of trimethylolpropane triacrylate, 2-hydroxy-3-phenoxyglopylacrylate (Nippon Kayaku Co., Ltd., Karayatsu R-1
28) A mixed solution of 5 polymerized parts, 1 polymerized part of 1-hydroxycyclohexylphenyl ketone, and 0625 polymerized parts of surfactant (Shin-Etsu Silicone Co., Ltd. KP-!+54) was used.

[Example 1] A large number of short optical transmission bodies arranged in advance are 100CK7J.
Two sheets of U# coated with O temperature adhesive to a thickness of 70 μm.
Attached plate and plate joint sandwiched f! Pressing was performed at a force of 1 ton for 60 seconds at a temperature of kaoC. after that,
Pressing was performed at 10C and a strength of 5 kg for 10 seconds. The obtained optical transmitter array was left in an atmosphere of temperature 40C and humidity 90% for 15 hours, and then both ends were cut to a length of 6970 μm. A UV curing resin solution was applied in the form of a mist onto the light transmitting body array and UV curing was performed.

At this time, it was possible to obtain an optical transmitter array having a uniform resin film with good alignment and no glue.

[Example 2] Same procedure as Example 1, only cold press for 10 seconds to 5 seconds.
I changed it to 0 seconds. An optical transmitter array having a uniform resin film with good alignment and no warpage was obtained.

[Comparative Example 1] The same procedure as in Example 1 was carried out except that the cold pressing step was omitted. Although the obtained optical transmitter array had good alignment, warpage occurred and the resin film was not uniform.

Patent applicant: Mitsubishi Rayon Co., Ltd.

Claims (2)

[Claims] (1) An optical transmission array characterized in that a plurality of short rod-shaped lenses are arranged and sandwiched in parallel between two substrates via a hot-melt adhesive. (2) A method for manufacturing an optical transmitter array, which comprises arranging a plurality of short optical transmitters in parallel between two substrates via a hot-melt adhesive, hot pressing, and then cold pressing.