TW200537757A - Planar connector - Google Patents

Abstract

It is an object of the present invention to provide a very thin planar connector having 2 mm or smaller contact pitch at the grid section and 0.5 mm or smaller thickness of the grid section, giving excellent performance in the whole performances such as moldability, flatness, warp-deformation, and heat resistance. A planar connector having a grid structure within an outer frame is molded by using (C) a complex resin composition prepared by blending (A) a liquid-crystalline polymer with (B) a fibrous filler, while the relation between the blending quantity and the weight-average length of (B) the fibrous filler is controlled to a specified range.

Description

200537757 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a flat surface connector having a lattice structure inside an outer frame such as a CP socket. [Prior art] Liquid crystalline polymers are known in thermoplastic resins as materials with excellent dimensional accuracy, shock resistance, and fluidity, and they are extremely free from flashover during molding. In the past, many of these characteristics have been used, and liquid crystal polymers have been used as materials for various electronic parts.

In particular, with the recent high performance of electronic equipment, so-called high-temperature-resistant connectors (increased productivity through mounting technology), high-density (multi-core), and miniaturization are also required. The characteristics of the above-mentioned liquid crystal polymers have been used, and glass fiber-reinforced liquid crystal polymer compositions have been adopted as connectors (full survey Engineering Plastics '92 -'93, pages 182 ~ 194, issued in 1992,]? _ 8-9-204951, 1?-8-240115). In a planar connector having a lattice structure inside an outer frame represented by a CPU socket, the above-mentioned tendency of high heat resistance, high density, and miniaturization is remarkable, and a glass fiber-reinforced liquid crystal polymer composition is often used. However, even for glass fiber-reinforced liquid crystalline polymer compositions having a certain degree of good fluidity, the spacing between the lattice portions required to be used in recent years is 2 mm or less, and the thickness of the resin portion of the lattice portion holding the terminals is 0. In the case of very thin flat connectors below 5 mm, performance is still insufficient. That is, in a very thin flat connector of such a lattice portion, if the lattice portion is to be filled with resin, the filling pressure is insufficient due to insufficient fluidity. 6 326 \ Patent Specification (Supplement) \ 94- 07 \ 94107779 200537757 becomes high, as a result, there is a problem that the amount of bending deformation of the obtained planar connector is increased. In order to solve this problem, although it is considered to use a liquid crystal polymer composition having good fluidity with a reduced amount of glass fiber added, such a composition has insufficient strength and causes a problem of deformation due to reflow during mounting. Thus, the present situation is that a flat connector made of a liquid crystal polymer having excellent performance balance has not yet been obtained. [Summary of the Invention]

As mentioned above, although various investigations have been made on the liquid crystal polymer composition used in a planar connector having a lattice structure, it is particularly related to the distance between the lattice portions of 2 mm or less and the lattice portions. A very thin, flat connector with a thickness of 0.5 hi m or less has no materials with excellent properties such as formability, flatness, bending deformation, and heat resistance. In view of the above-mentioned problems, the present inventors have conducted intensive research and review in order to provide a flat connector made of a liquid crystalline polymer with excellent performance balance. In the case where the weight average length of the filler has a certain relationship with the blending amount, a planar connector having good formability, flatness, bending deformation, heat resistance and other properties can be obtained, and the present invention has been completed. That is, the present invention is a (C) composite resin composition in which (B) a fibrous filler is blended in a (A) liquid crystalline polymer (however, the blending amount and weight average length of the (B) fibrous filler are blended) Is a planar connector formed by satisfying the following area (D), and has a lattice structure inside the outer frame. 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 Ί 200537757 [Zone (D)] The X axis is the blending amount of (B) the fibrous filler ((C) wt% in the composite resin composition), Y The axis is (B) the weight-average length of the fibrous filler (// hi), and the area surrounded by the following functions (1) to (5) (1) X = 36 (2) X = 53 (3) Yl 60 (4) Υ-360

(5) Υ = (1 8 2 2 2 / ×) -84. 44 In addition, the present invention is a use of the planar connector having the lattice structure inside the outer frame of the (C) composite resin composition. [Embodiment] Hereinafter, the present invention will be described in detail. The liquid crystalline polymer (A) used in the present invention refers to a melt-processable polymer having a property of forming an optically anisotropic melt phase. The properties of the anisotropic molten phase can be confirmed by a conventional polarization inspection method using a vertical polarizer. More specifically, the confirmation of the anisotropic molten phase can be performed by observing the molten sample carried on the Leite t hot stage under a nitrogen environment at a magnification of 40 times using a Leite z polarized light microscope. When the liquid crystalline polymer applicable in the present invention is inspected between vertical polarizers, it can usually pass polarized light even when it is in a molten stationary state, and exhibit optical anisotropy. The liquid crystalline polymer (A) is not particularly limited as described above, but it is preferably an aromatic polyester or an aromatic polyester fluorene amine, and partially contains an aromatic polyester or an aromatic polyester fluorene in the same molecular chain. Amine polyesters are also in this range. The 8 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 200537757 is used when it is dissolved in pentafluorophenol at a concentration of 0.1% by weight at 60 ° C, preferably at least about 2. 0 d 1 / g, more preferably 2. 0 to 1 0. 0 d 1 / g logarithmic viscosity (I · V ·). As the liquid crystalline polymer (A), the aromatic polyester or aromatic polyacetamide which can be used in the present invention, it is particularly preferred to have an aromatic diamine group, an aromatic hydroxyamine, or an aromatic diamine group. Aromatic polyester and aromatic polyester amidamine having at least one compound of the group as a constituent. More specifically, it can be enumerated

(1) Polyester composed mainly of one or more aromatic hydroxycarboxylic acids and their derivatives; (2) Polyester mainly composed of (a) one or more aromatic hydroxycarboxylic acids and their derivatives; (B) one or more of aromatic dicarboxylic acids, alicyclic dicarboxylic acids and their derivatives; and (c) aromatic diols, alicyclic diols, aliphatic diols and their derivatives Polyester composed of at least one or two or more; (3) one or two or more of (a) aromatic hydroxycarboxylic acids and their derivatives; (b) aromatic hydroxyamines, aromatic diamines, and One or two or more derivatives; and (c) one or more polyester amidamines composed of one or more aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and derivatives thereof; (4) mainly composed of (a ) One or two or more aromatic hydroxycarboxylic acids and their derivatives; (b) one or two or more aromatic mesialamines, aromatic diamines and their derivatives; (c) aromatic dicarboxylic acids, One or more of alicyclic dicarboxylic acids and derivatives thereof; and (d) aromatic diols, alicyclic diols, aliphatic diols, and The at least one biological or polyester Amides like composed of two or more. In addition, among the above constituents, a molecular weight of 9 326 \ patent specification (supplement) \ 94_07 \ 941〇7779 200537757 regulator can be used in combination as needed. Preferred examples of specific compounds constituting the aforementioned liquid crystalline polymer (A) to which the present invention is applicable include aromatic hydroxycarboxylic acids such as p-hydroxybenzoic acid, 6-hydroxy-2 -naphthoic acid, and 2 , 6-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 4, 4'-dihydroxybiphenyl, hydroquinone, resorcinol, the following general formula (I) and the following general formula (II) Aromatic diols such as compounds; terephthalic acid, isophthalic acid, 4, 4'-diphenyl dicarboxylic acid, 2, 6-naphthalenedicarboxylic acid, and the following general formula (III) Aromatic dicarboxylic acids such as compounds; aromatic amines such as p-aminophenol and p-phenylene diamine. H0 Ό-X " " 0-

OH (I)

HO (I)

HOOC hQ) -Y- £ ^ -C00H (Π)

(Wherein: X: selected from the group consisting of Cl ~ C4, alkylidene, -〇-, -SO-, -S〇2-, -S-, -CO-, Y:- (CH2) n- (n = 1 to 4), -0 (CH2) n0- (n = 1 to 4).) A particularly preferred liquid crystal polymer (A) suitable for use in the present invention is Aromatic polyester containing p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid as main constituent units. The (C) composite resin composition used in the present invention is one in which (B) a fibrous filler is blended in the (A) liquid crystalline polymer, and the (B) fibrous filler 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 10 200537757 The relationship between the compounding amount of filler and the average weight must meet the requirements of the following area (D). [Region (D)] X-axis is the blending amount of (B) fibrous filler ((C) wt% in composite resin composition), and Y-axis is the average weight of (B) fibrous filler (// m), the area surrounded by the following functions (1) to (5) (1) X = 36 (2) X = 53

(3) Y = 1 60 (4) Y = 360 (5) Υ = (1 8 2 2 2 / χ) -84. 44 The above-mentioned area (D) is the area shown by Z in Fig. 1, basically, ( Β) The average weight of the fibrous filler must be (3) Υ = 1 6 0 // m or more and (4) Y = 360 // m or less. (B) In the case where the weight-average length of the fibrous filler is less than 16 0 // m, the reinforcing effect is small, and the desired effect cannot be obtained even if the blending amount is increased. In addition, if the weight-average length of the (B) fibrous filler exceeds 3 6 0 // m, even if the blending amount is reduced, the fluidity is deteriorated, and a connector with excellent flatness cannot be made. The weight average length of the fibrous filler (B) referred to in the present invention is a value in a molded product and can be measured by a method described later. (B) The fiber diameter of the fibrous filler is not particularly limited, and it is generally about 5 to 1 5 // m. The blending amount of the (B) fibrous filler (the blending ratio in the (C) composite resin composition) must be (1) X = 36 or more by weight and (2) X = 5 3 11 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 200537757 Weight% or less. (B) If the blending amount of the fibrous filler is less than 36% by weight, even if a fibrous filler having a relatively long weight average length is used, the reinforcing effect is still small, and the desired effect cannot be obtained. In addition, if the blending amount of the (B) fibrous filler exceeds 53% by weight, even if a fibrous filler having a relatively short weight average length is used, the fluidity is deteriorated, and a connector having excellent flatness cannot be made.

Furthermore, the above-mentioned area (D) must satisfy the requirement of (5) Y = (1 8 2 2 2 / X)-8 4 · 4 4. That is, even in the area surrounded by the functions of (1) to (4), as the blending amount of (B) fibrous filler increases (41% by weight or more), if (B) fibrous filler is not used If the weight average length of the agent is short, the balance between fluidity, strength, and flatness is deteriorated, and the desired effect of the present invention cannot be obtained. Examples of the fibrous filler (B) used in the present invention include glass fibers, carbon fibers, whiskers, inorganic fibers, and mineral fibers, and glass fibers are preferred. The (C) composite resin composition used in the present invention must have excellent fluidity. If it is specified by viscosity, use a capillary rheometer with L = 20 mm and d = 1 mm at a temperature of 3 6 0 ° C. Shear speed 1 0 0 0 / s and the apparent melt viscosity measured according to IS 0 1 1 4 4 3 is preferably 5 5 P a · s or less. The composition having such an apparent melt viscosity is a liquid crystal polymer (10 to 100 Pa · s, preferably 10 to 40 Pa · s) with a general melt viscosity. Obtained in the case where the (B) fibrous filler is blended within a range satisfying the aforementioned conditions. The method for obtaining such a composition is not particularly limited, but it is generally melt-kneaded using an extruder 12 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 200537757. However, many conventional extrusion methods for feeding a fibrous filler from the side of a molten liquid crystalline polymer are not available. Therefore, it is necessary to use a method of remelting and kneading the liquid crystalline polymer composition mixed with a fibrous filler once melt-kneaded, feeding the fibrous filler from the side, and granular (particle diameter 1 mm or more) liquid crystallinity. Methods of polymers, etc. A method in which the granular liquid crystalline polymer is fed from the side with less heat history is preferred. The extruder used is preferably a twin-screw extruder for easy side feeding.

By forming the (C) composite resin composition of the present invention, various planar connectors can be obtained, and the conventional lattice technology cannot provide an industrially practical lattice section with an interval distance of 2 mm or less and a lattice retaining terminal. The thickness of the resin portion of the portion is 0.5 mm or less, and the height of the entire product is 5. 0 mm or less, which is particularly effective in a very thin body-shaped connector. If such a planar connector is further described in detail, it is the connector shown in FIG. 2 formed in the embodiment, and has a number of hundreds of pins (p i η) in a product of about 40mmx40mmxlmm. As shown in FIG. 2, the planar connector referred to in the present invention may of course have an opening of an appropriate size in the lattice portion. By using the (C) composite resin composition of the present invention, as shown in FIG. 2, the distance between the lattice portions can be set to 2 mm or less (1.2 mm). Very thin flat connectors with a thickness of 0.5 mm or less (0.18 mm) are formed with good formability, and their flatness is also excellent. If its flatness is specified numerically, the peak temperature after the peak temperature 13 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779

200537757 230 ~ 280 ° C The surface before IR reflow step for surface mounting is 0.09mm or less, and the flatness difference before and after reflow is 0.02mm or less. It can be said that it has excellent flatness in practice. The molding method for obtaining a connector having such excellent flatness is not limited, and an economical injection molding method is preferably used. In order to obtain a connector having such excellent flatness by molding, it is important to use the aforementioned liquid crystalline polymer composition, and it is preferable to select molding conditions without residual internal force. In order to reduce the filling pressure and reduce the residual internal stress of the device, the temperature of the cylinder of the forming machine is preferably above the melting point T ° C of the liquid crystal polymer. If the temperature of the cylinder is too high, the cylinder nozzle will be used as the fat is decomposed. Problems such as sticky wires occur, so the cylinder is T ° C ~ (T + 3 0) ° C, preferably T ° C ~ (T + 1 5) ° C. The mold temperature is preferably 70 to 100 ° C. If the mold temperature is low, it causes poor flow of the filling resin composition, which is not good, and if the mold temperature is too high, the problem of overflow occurs, which is not good. Regarding the injection speed, it is preferably 150 m m / s e c or more. If the injection speed is low, only the unfilled molded product may be obtained, or even if the completely filled molded product is obtained, the molded product has a high filling pressure and a large residual internal force, and may only obtain a connector with a poor flatness. (C) Additives such as nucleating agents, carbon black machine-burning pigments, antioxidants, stabilizers, plasticizers, agents, release agents, and flame retardants to the composite resin composition to impart desired characteristics The group is also included in the range of the (C) composite resin composition of the present invention. (Examples) Hereinafter, the present invention will be described in detail based on examples. However, the present invention is not 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 14 degrees, and there is no special injection term for the attachment linking tree temperature. The degree of forming is the same as the material, the part should be 0, and the non-lubricating product is limited.

200537757 here. In addition, physical properties were measured and tested in the examples. (1) Determination of the weight-average length of glass fiber 5 g of resin composition pellets are heated at 600 ° C 2 The ashing residue is completely removed from the glass m in a 5% polyethylene glycol aqueous solution, and the microscope is Observe the glass fibers. An analysis device (LUZEX FS, manufactured by Nireco Co., Ltd.) was used to measure the glass length. In addition, during image analysis, the superimposed fibers Φ fibers are subjected to a subroutine for obtaining each length. In addition, it measured except glass fiber. (2) Apparent melt viscosity: Capilograph 1B with capillary rheology of L = 20 mm and d = 1 mm) was measured at a temperature of 360 ° C and according to IS 0 1 1 4 4 3 . (3) The connector flatness is measured from the resin composition pellets, with the following molding conditions, a size of 39. 82mmx36. 82mmxlmm t, an opening at the center of 19.2 mm, and a lattice interval of 1.2 ί device (pin hole number 494pin). The gate system uses a thickness of 3 mm from the reverse side of the resin retention. Place the obtained connector on a horizontal table, and measure it with a Q uick V isi ο η 4 0 4 PR 0. At this time, the position of 0.5 mm from the connector end surface is 1 0 326 \ Patent Specification (Supplements) \ 94-07 \ 94107779 15 It is ashed in the following way. > After dispersing, separate the weight average dimension of the image using a syringe while disintegrating the fiber to separate each I below 5 0 // m (Toyo Seiki Co., Ltd.) Shear speed 1 0 0 0 / s 19.02mmx nm plane-connected thin-film gate, the gate is the height of Mitutoyo connector. The mm interval is measured, and 200537757 regards the difference between the maximum height and the minimum height as the flatness. In addition, Japan PULSE Technology Research Institute The large tabletop reflow soldering equipment RF-300 was heated under the conditions of a peak temperature of 250 ° C and a heating time of 5 minutes, and then the flatness was measured by the above method, and the flatness difference before and after reflow was obtained. [Forming conditions] Molding machine: FANUC α-5 0 C (using a medium diameter nozzle) Cylinder temperature: 3 5 0 ° C-3 5 0 ° C-3 4 0 ° C-3 3 0 ° C (nozzle)

Φ Mold temperature: 8 0 ° C Injection speed: 200mm / sec Holding pressure: 2 9 MPa Filling time: 0. 0 8 sec Holding time: 1 sec Cooling time: 5 sec Screw revolutions: 1 2 0 rpm Screw back pressure ： 0.5 Μ Pa

(4) Flexural modulus of elasticity It was measured in accordance with ASTM D 790 using a 125 mmxl2.7mmx0.8mm injection molded sheet. < Examples 1 to 5 and Comparative Examples 1 to 9 > The above-mentioned test pieces of a liquid crystal polymer composition containing glass fibers were produced and evaluated under the following conditions, and the results shown in Table 2 were obtained. [Manufacturing conditions] (Ingredients used) 16 326 \ Patent specification (Supplement) \ 94-07 \ 94107779 200537757 • Polymer: Liquid crystal polymer pellets (manufactured by Polyplastics Co., Ltd., V ectra E 9 5 0 i ), A matrix polymer with a melting point of 3 3 5 ° C and a viscosity of 3 0 P a · s (3 5 0 ° C, measured at a shear rate of 1 0 0 0 / s), pellet size: about 5 ~ 3 mmx about 3 to 2 mmx about 3 to 1 mm • Glass fiber (1) Examples 1 to 5 and Comparative Examples 1 to 8 Users: CS03JA419 (Cut fiber bundle with fiber diameter 10 " m) manufactured by Asahi Fiber Glass Co., Ltd. Lu (2) User of Comparative Example 9: PF 7 0 (fiber diameter 10 μm, fiber length 8 0 // m rolled fiber) made by Tobo (Joint) • Lubricant: Made by Japan Grease (Stock) U nister Η-4 7 6 (composite equipment) • Extruder: Tex-30 α (screw diameter 32mm, L / D: 38.5) twin screw extruder made by Nippon Steel Co., Ltd. The outline of the extruder screw is shown in the figure 3.

Main feed port 1 1 ·· C1 Plasticizing part 1 2: C 4 ～ C 5 (Composition: upstream kneading, reverse kneading, length 1 2 8 mm) Side feed port 1 3: C 5 kneading Section 1 4: C 6 ~ C 8 (Composition: Upstream side kneading, vertical kneading, counter-kneading, counter-rotating groove, counter-kneading, counter-kneading, counter-rotating groove, length 3 5 2 mm) Feeder of main feed port: Screw-type Loss-in W eight feeder made by Japan Steel Co., Ltd. 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 17 200537757 Feeder of contralateral feed port: Pill Granular resin: K-TR 0 N screw type L 〇ss-in W eight feeder glass fiber: screw-type Loss-in Weight feeder (squeeze condition) made by Japan Steel Co., Ltd. cylinder temperature: main feed only The cylinder C1 of the material port 11 is 200 ° C, and the other cylinder temperatures are 350 ° C.

Die head temperature: 3 5 0 ° C

(Composition and Extruding Method of Composition) Using the above-mentioned twin-screw extruder, pellets of the liquid crystalline polymer are supplied from the main feed port 11 and the side feed port 13 and the lubricant is fed from the main feed port. 1 1. Glass fiber is supplied from the side feed port 1 3. A twin-screw side feeder was used at the side feed port, so that the ratio of liquid crystal polymer pellets, lubricants, and glass fibers was as shown in Table 1, using a weight feeder to control. The number of screw revolutions and the amount of extrusion were set as shown in Table 1. The graft resin composition discharged from the die 16 in a bundle was transported by a Mesh Belt conveyer manufactured by Tanaka Manufacturing Co., Ltd. and cooled with spray water from a sprayer. Cut pellets. From the pellets, the test pieces described above were produced by an injection molding machine and evaluated, and the results shown in Table 2 were obtained. The relationship between the blended amount of glass fibers and the weight average length in each composite resin composition of Examples and Comparative Examples is shown in FIG. 1. 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 18 200537757

Extrusion (kg / hr) t 1_ LO CO LO CO LO CO in CNI LO CN1 LO CO LO CNI LO CX1 LO CO LO οα LO CNI LO (N1 LO CNI LO CNI 1 revolutions (rpm) 1_ 〇ο ο CD 〇◦ 〇〇CD 〇 ＞ 〇 〇 〇 茭 CZ> Addition amount (% by weight) from side feed port 13 Glass fiber LO S LO CO LO CO LO CO LO inch s LO LO 1 Liquid crystal polymer CZD CO S LO inch LO CO S 1 1 LO LO 1 1 LO LO 1 11 1%) Lubricant CO 〇CO ◦ CO ◦ CO cz > CO ◦ CO ◦ CO 〇 CO ◦ CO ◦ · CO ◦ · CO 〇 · CO CD CO CD CO 〇) From the main feed port (weight: liquid crystal polymer σσ οα Β 卜卜卜 寸 · 卜 CT) 卜 CO 卜 inch · CO 卜 σί 卜 cr! LO 寸 · LO CO CO 卜 LO Example 1 Example 2 Example 3 | Example 4 I | Example 5 1 Comparative Example 1 Comparative Example 2 P Comparative Example 3 | Comparative Example 4 1 1 Comparative Example 5 Comparative Example 6 1Comparative example 7 | Comparative example 8 Comparative example 9 61 6 /, αοι inch 6 \ Δ9 inch 6 \ ipsi) # ^^^ * \ 9 (Ne 200537757 Table 2 Glass fiber addition amount (weight »glass fiber weight average Fiber length (// m) Viscosity (Pa · s) Flatness before re-welding (mm) Flatness difference before and after re-welding (mm) Flexural modulus (GPa) Example 1 40 320 40 0.073 0.009 16.2 Example 2 40 190 36 0.059 0.003 15.6 Implementation Example 3 40 226 31 0.048 0.002 15.6 Example 4 45 264 37 0.083 0.009 18.5 Example 5 50 255 39 0.083 0. 007 20.0 Comparative Example 1 30 214 32 0.061 0.045 14.0 Comparative Example 2 35 370 57 0.073 0.021 17.8 Comparative Example 3 35 430 59 0.069 0.027 17.9 Comparative Example 4 35 229 32 0.067 0.102 15.8 Comparative Example 5 40 397 56 0.092 0.010 19.4 Comparative Example 6 45 359 60 氺 氺 20.5 Comparative Example 7 50 315 67 * 氺 20.9 Comparative Example 8 55 305 80 氺 氺 22.0 Comparative Example 9 40 80 57 0.072 0.088 15.5 * Due to poor fluidity, only unfilled molded products were obtained.

[Brief description of the drawings] FIG. 1 is a diagram showing a region showing the relationship between the blending amount of the fibrous filler and the weight average length in the composite resin composition specified in the present invention. 2 is a view showing a planar connector formed in the embodiment, (a) is a plan view, (b) is a right side view, (c) is a front view, (d) is a detailed view showing Part A, (E) is a detailed diagram showing Part B. In addition, the numerical unit in the figure is m m. FIG. 3 is a diagram showing the outline of the screw of the extruder used in the example. [Description of main component symbols] 1 Resin retention 2 Pitch interval 326 \ Patent specification (Supplement) \ 94-07 \ 94107779 20 200537757 Thickness of the material mouth of the material mouth of the mouth of the mouth of the mouth of the mouth 3 device of the lattice 11 main entrance 12 plastic 13 sides Into 14 Mixing 15 Ventilation 16 Mould 17 Decompression

326 \ Patent Specification (Supplement) \ 94-07 \ 94107779 21

Claims (1)

200537757 10. Scope of patent application: 1. A flat connector, characterized by (C) composite resin composition (B) with fibrous filler in (A) liquid crystal polymer (B) The relationship between the blending amount of the fibrous filler and the weight average length satisfies the following area (D), and has a lattice structure inside the outer frame; [Area (D)] The X axis is (B) The amount of the fibrous filler ((C) wt% in the composite resin composition #), the Y-axis is (B) the weight average length of the fibrous filler (// m), and the following (1) ~ ( 5) The area enclosed by the function: (1) X = 36 (2) X = 53 (3) Y = 160 (4) Υ-360 (5) Υ 二 (1 8 2 2 2 / Χ)-8 4 4 4 ° 2. As for the flat connector of the scope of patent application item 1, wherein the connection The device is one with an interval of less than 2 mm between the lattice parts, a thickness of less than 0.5 m m, and a height of the entire product of less than 5.0 m. 3. The flat connector according to item 1 or 2 of the scope of patent application, wherein (C) the composite resin composition uses a capillary rheometer with L = 20 mm and d = 1 mm at a temperature of 3 60 ° C The shear rate is 1 0 0 0 / s and the apparent melt viscosity measured according to IS 0 1 1 4 4 3 is 55 Pa · s or less. 4. As for the flat connector of item 1 or 2 of the scope of patent application, in which IR reflow soldering for surface mounting at a peak temperature of 2 3 0 ~ 2 0 0 ° C 22 326 \ Patent Specification (Supplement) ) \ 94-07 \ 94107779 200537757 The flatness before the step is 0.09mm or less, and the flatness difference before and after reflow is 0 · 0 2 mm or less. 5. For the flat connector of item 1 or 2 of the patent application scope, in which (C) the composite resin composition uses capillary rheology of L = 20 mm, d = 1 mm, with a temperature of 3 60 ° C, shear The cutting speed is 1 0 0 0 / s and the apparent melting viscosity according to IS 0 1 1 4 4 3 is 5 5 Pa · s or less. After IR reflow for surface mounting at a peak temperature of 230 ~ 280 ° C The plane before the step is 0.09mm or less, and the flatness difference before and after reflow is 0.02mm or less 23 326 \ Patent Specification (Supplement) \ 94-07 \ 94107779