JPH0197901A - Resin molding for optical parts - Google Patents

Abstract

PURPOSE:To improve heat resistance and mechanical strength by consisting a titled molding of the solid soln. of polyvinylidene fluoride and polymethyl methacrylate and formulating the solid soln. in such a manner that the polyvinylidene fluoride is incorporated therein at >=62% of the entire part. CONSTITUTION:This resin molding is the solid soln. of the polyvinylidene fluoride (PVDF2) and the polymethyl methacrylate (PMMA) and is so constituted that the PVDF2 is incorporated therein at >=62% of the entire part. Namely, the molding formed by mixing the PVDF2 and PMMA in such a manner that the characteristics including thermal deformation temp., elongation and light refractive index are optimized overall is used. The thermal deformation temp. is >=120 deg.C, the elongation >=90%, and the light transmittance is >=80% if the content of PVDF2 is 62-75%. The thermal deformation temp. and elongation are thereby improved and the heat resistance and mechanical strength are improved in the case of using this molding for an optical fiber, etc.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a resin molded body used for optical components such as plastic optical fibers, which is a solid solution of polyvinydene fluoride and polymethyl methacrylate for the purpose of improving heat resistance and mechanical strength. , the polyvinylidene fluoride is contained in an amount of 62% or more of the total content.

[Industrial application field]

The resin molded body of the present invention is used for plastic optical fibers for short-distance communication used in automobile engine compartments, flat light guides used for optical display parts of car components, etc., and is used for such optical parts. There is a demand for improved heat resistance and mechanical strength.

[Conventional technology]

A conventional plastic optical fiber will be explained. Generally, an optical fiber is composed of a core 1, a cladding 2, and a coating material 3, as shown in FIG. 1. Recently, plastics, which are inexpensive and have excellent workability, have been used for the core 1 and the cladding 2.

Conventionally, in such optical fibers, polycarbonate (PC), which has excellent heat resistance, has been used as the core 1, and polymethyl methacrylate (PMMA), which has relatively good heat resistance and a lower pressure welding ratio than PC, has been used as the cladding 2. There is.

[Problem that the invention seeks to solve]

The PMMA used as the cladding material of the conventional plastic optical fiber mentioned above has a relatively high heat resistance temperature of 115°C, but it is lower than the heat resistance temperature of PC used as the core material, 135°C, and has a high heat resistance as an optical fiber. It is decreasing. For example, the heat-resistant temperature that can be used in the engine room of an automobile is 120°C, and conventional cladding materials cannot be used.

Furthermore, the elongation of PMMA is extremely low at 5%, and the elongation of PC is 9%.
Since the difference is large compared to 0 to 110%, it cannot follow the elongation of PC and is likely to break.

[Means for solving problems]

In order to solve the above problems, the present invention consists of a solid solution of polyvinidene fluoride and polymethyl methacrylate,
The present invention provides a resin molded body for optical components containing 62% or more of the polyvinydene fluoride.

[Effect]

According to the above method, as can be seen from FIG. 2, the heat resistance temperature exceeds 120° C., and the elongation reaches a maximum of 260%, resulting in mechanical strength without any problems.

〔Example〕

Examples of the present invention will be described below.

First, a first example applied to a plastic optical fiber will be described.

In the optical fiber shown in Figure 1, polycarbonate (PC) is used as the core 1, a solid solution of 70% polyvinylidene fluoride (PVDF) and 30% polymethyl methacrylate (PMMA) is used as the cladding 2, and A covering material 3 that does not transmit light is applied.

In an optical fiber, the refractive index of the core must be greater than the refractive index of the cladding, but in this example the PC
The refractive index of the solid solution of PVDF and PMMA is about 1.44, which is not a problem.

Furthermore, the heat resistance temperature of PC is high at 135°C.

According to Figure 2, PVDF! The heat resistance, elongation, and light transmittance when changing the solid solution fraction of PMMA and PMMA will be explained.

In the graph in Figure 2, the horizontal axis is PMMA/PVD F
The z fraction and the vertical axis represent the heat deformation temperature, elongation, and light transmittance, respectively. The solid line is the heat distortion temperature, the dotted line is the elongation, −
The dotted chain line is the light transmittance.

Looking at the heat distortion temperature, when PVDF8 is mixed with PMMA, it decreases from 115℃, and PMMA:PVD
When F is 50:50(7), it becomes extremely low as 60°C. However, when the amount of PVDFz exceeds the amount of PMMA, the heat distortion temperature increases, and when PVDFz reaches 62%, P
The heat resistance temperature is 120°C, which is higher than that of MMA alone. This one
The heat-resistant temperature of 20° C. can be used, for example, in the engine room of an automobile. Furthermore, as the amount of pVDF increases, the heat resistance temperature also increases.
When DFg is 70%, the temperature is 150°C.

Next, looking at elongation, with PMMA alone, the elongation is 5%, but when PVDF is mixed and the amount is increased, the elongation gradually increases, and PMMA:PVDF is 5%.
0: It rapidly increases from the time of 50(7), and reaches the maximum of 260% when the P V D F t of this example is 70%. The elongation of PC is 90 to 110%, and the elongation of PMMA alone (conventional) is 5%, and the cladding cannot follow the elongation of the core and easily breaks, but its strength is extremely high.

Also, regarding light transmittance, PMMA: PVDF2
is almost constant until 30:70, but PVD
When Fz exceeds 70%, the condition deteriorates rapidly. However, in terms of transmittance, it may be possible to use optical fibers for short-distance communication as long as they have a certain degree of transmittance.

As the cladding material in this example, a mixture of pVDFz and PMMA was used in order to obtain the best after comprehensively considering the above characteristics of heat distortion temperature, elongation, and optical refractive index. If it is 62-75%, the heat distortion temperature is 120°C or more, the elongation is 90% or more, and the light transmittance is 8
If it is 0% or more, its properties will be excellent for any purpose.

Further, although PC was used as the core 1 in this embodiment, it may be more effective to use a solid solution of PC and polyester carbonate (PEC). Figure 3 shows PC/
The graph shows the optical transmission loss and thermal distortion temperature when the PEC fraction is changed. According to this graph, the higher the PEC ratio, the higher the thermal distortion temperature, and conversely, the optical transmission loss worsens, so the optical fiber The ratio may be changed depending on the purpose. That is, if heat resistance is required and high transmittance is required for short-distance communication (but is acceptable, increase the amount of PEC0, and if heat resistance is not required and high transmittance is required, increase the amount of PC).

Furthermore, if it is desired that light be incident not only from the end face of the optical fiber but also from the side face and propagate through the fiber, it is preferable to include an organic phosphor in the core material. The light incident on the core is once absorbed by the organic phosphor, and isotropically emitted from the phosphor and propagates in all directions. and core 1 and cladding 2
It is reflected at the interface with the optical fiber and propagated in the axial direction of the optical fiber. Incidentally, when this organic phosphor is contained, the coating material 3 is not applied.

Next, a second embodiment will be described in which the present invention is applied to a flat light guide used in a light display section of a car component or the like. As shown in FIG. 4, such a light guide has a light source 4 inside, contains an organic phosphor 5 that absorbs light from the light source 4 and emits light isotropically, and further has a light source on one side (back side). A reflective film 6 made of white paint, aluminum, etc. is provided on the other side (surface).
The structure is such that uniform light is emitted from the entire surface.

Although this light guide is not required to have very high resistance to cracking, it is desirable to have improved mechanical strength since there is a risk that it will fall and break during handling during the manufacturing process.

Therefore, as in the first embodiment, PVDF, 70% and PM
If a solid solution with 30% MA is used for the light guide, its elongation will be extremely high at 260%, so there will be less possibility of damage even if undesired force is applied by the falling ring.
The effect can be said to be significant.

〔effect〕

According to the present invention, the thermal deformation temperature and elongation are improved, and when used in optical fibers, etc., the heat resistance and mechanical strength are excellent, and an extremely effective resin molded body can be provided.

[Brief explanation of the drawing]

FIG. 1 shows the structure of a plastic optical fiber according to the first embodiment of the present invention, and FIG. 2 shows the structure of PMMA and PVDF according to the present invention.
! Figure 3 shows the characteristics when the solid solution fraction of PC and PEC used in the core of the optical fiber of the first embodiment was changed. The graph and FIG. 4 are a perspective view and a sectional view showing the structure of a light guide according to a second embodiment of the present invention. In Fig. 1, 1 is a core, 2 is a cladding, 3 is a covering material,
In FIG. 4, 4 is a light source, 5 is an organic phosphor, and 6 is a reflective film. Blood 2 Oshida Hi 3 Plastic optical fiber/) Side! Figure 1 PC%0 Yutake Akira PC/ PEC PC/PECn% Summoning an umbrella: yer: mn
Husband, Silent Transformation Yujiri Collapse Sacrificial Light Body S Shoulder-to-Shoulder Hair Body 5 Light Kaid/LS Yesterday L J 4 Picture Procedure Correction Paperback) 0 view, 2, back. 1. Indication of the case Showa b2 year Permanent Application No. V"b93 No. 3. Person making the amendment Relationship with the case 1. ? Applicant Address Nakahara Ward, Yozaki City, Kanagawa Prefecture - 1015 (522) Small IJI Naka Name: Fujitsu Ltd. 4, Agent: Address: 11015 Nakahara 1g, Yozaki City, Kanagawa Prefecture , N correct subject (1) "Claims" column of the specification (2) "Detailed explanation of the invention (prior art)" column 8 of the specification, contents of amendment (1) Description of the specification "The column of claim 1 is amended as shown in the attached sheet. (2) "Tangential factor" stated on page 3, line 13 of the specification.
is corrected as "refractive index". 9. Amended list of attached documents Claim 2, Claim (1) Consisting of an am-form of polyvinylidene fluoride and polymethyl methacrylate, containing 62% or more of the total polyvinylidene fluoride. A resin molded body for optical components, characterized in that: (2) The polyvinylidene fluoride accounts for 62 to 75% of the total
The resin molded body for optical components according to claim 1, characterized in that it contains a resin molded body for optical components. (3) The resin molded body for optical components according to claim 1, which is a cladding in a plastic optical fiber.・S5(4) It is a flat d-light proboscis that propagates light from a light source.
The resin molded body for optical components according to claim 1, which has a trt characteristic. (5) The core material in the plastic party 7-cho ino (is made of borica, -bonate or poly-552 carbonate tX is a solid solution of polycarbonate and poly5-52 α carbonate. Range 3rd
A resin molded body for optical components as described in 2. (6) The resin molded body for an optical component according to item 3, item 5 of the patent conclusion, characterized in that the plastic optical fiber/< and the light guide contain an organic phosphor.

Claims (6)

[Claims] (1) A resin molded body for optical components, which is made of a solid solution of polyvinylidene fluoride and polymethyl methacrylate, and contains 62% or more of the polyvinylidene fluoride. (2) The polyvinylidene fluoride accounts for 62 to 75% of the total
The resin molded body for optical components according to claim 1, characterized in that it contains a resin molded body for optical components. (3) The resin molded body for optical components according to claim 1, which is a cladding of a plastic optical fiber. (4) The resin molded body for optical components according to claim 1, which is a flat light guide that propagates light from a light source. (5) The core material in the plastic optical fiber is
4. The resin molded article for optical components according to claim 3, which is polycarbonate, polyethylene carbonate, or a solid solution of polycarbonate and polyethylene carbonate. (6) The resin molded body for optical components according to claim 3 or 5, wherein the plastic optical fiber and the light guide contain an organic phosphor.