JP2872302B2 - Synthetic resin molded product - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a synthetic resin molded product which is formed by injecting a synthetic resin into a mold and molding, and having an intersecting plane as an optical reflecting mirror surface.

[Conventional technology]

Conventionally, when a molded article having an optical reflecting mirror surface is molded from a synthetic resin, in injection molding, contraction during cooling and contraction / expansion due to temperature / temperature change during use of the molded article are caused by FIG. As shown in (b) and (b), in each of the mirror surfaces 51 and 52 composed of two intersecting planes in the synthetic resin molded product 50, a deformation force in the slewing direction or a deformation force in the slewing direction is generated. In addition, the mirror surfaces 51, 52
When reinforcing walls are provided on both ends of the mirror surface, the generated deformation force is uniformly applied over the entire mirror surfaces 51 and 52, and the angle near the corner formed by two intersecting planes
There was a disadvantage that 53 changed.

Therefore, the following inventions have been disclosed in order to solve the above-mentioned drawbacks.

For example, in the invention described in Japanese Patent Application Laid-Open No. 61-116519, a method is used in which a mold is moved after resin injection to reduce the cavity volume and apply pressure to a molded product.

In the invention described in Japanese Patent Publication No. 60-3979,
A method of partially controlling the cooling inside the mold.

Further, in the invention described in JP-A-63-212121, a method of embedding a core material in a molded product and the like have been proposed.

[Problems to be solved by the invention]

However, the conventional technique has the following disadvantages.

In the invention described in Japanese Patent Application Laid-Open No. 61-116519, when a compression pressure is applied to a molded product in a mold, good accuracy can be maintained in the mold, but when the molded product is released from the mold, the internal pressure generated during compression is reduced. The molded product is deformed due to the stress.

In the invention described in Japanese Patent Publication No. 60-3979,
The method of partially controlling the temperature in the mold has a drawback that the accuracy of the molded product varies greatly due to a slight variation in the temperature control.

Further, in the invention described in JP-A-63-212121, the method of embedding a core material in a molded product has a disadvantage that the molding cost is increased.

Therefore, the present invention has been made in view of the above-mentioned drawbacks in the prior art, and in injection molding, shrinkage during cooling, and shrinkage / expansion due to humidity / temperature change during use of a molded product, have two problems. It is an object of the present invention to provide a molded article having an optical reflecting mirror surface having a very small angle change near a corner formed by intersecting planes.

[Means for solving the problem]

The present invention relates to a molded product having two intersecting planes of a synthetic resin molded product having an optical reflecting mirror surface, wherein edges are provided at both ends of the respective reflecting mirror surfaces outside the effective area, and the two intersecting planes are provided. A reinforcing wall connecting the respective edges is provided with the corner formed at the top as a top, and the reinforcing wall is provided at each edge of the reflection mirror surface opened on the opposite side to the corner. It is configured by providing an unconnected portion. In addition, an elastic member is interposed in the blank portion.

The corner formed by two intersecting planes indicates an intersection line of the intersecting planes.

[Action]

In the synthetic resin molded product of the present invention, the deformation force of the plane including the mirror surface can be concentrated on the plane portion provided with the cutout, and the contact area of the movable core in contact with the cutout increases, so that the movable core Heat does not accumulate at the tip (near the corner of the mirror surface), and the fixed core and the movable core dissipate heat (heat transfer) in the same manner, so that the temperature difference between the two cores can be reduced.

Further, it is possible to prevent the influence of the deformation of the mirror surface due to the temperature change and humidity change of the molded product on the angle near the mirror surface corner.

〔Example〕

Hereinafter, embodiments of a synthetic resin molded product having an intersecting plane as an optical reflecting mirror surface according to the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIGS. 1 and 2 show the first embodiment of the synthetic resin molded article of the present invention.
1 shows a perspective view and FIG. 2 shows a front view.

Reference numeral 1 denotes a synthetic resin molded product. In this synthetic resin molded product 1, a flat plate 2 and a flat plate 3 intersect with each other.
It is 5 and the corner 6 where the mirror surfaces 4 and 5 intersect (intersection line)
Are orthogonal. Edges 7, 8, 9, 10 are provided at both ends of the mirror surfaces 4, 5 outside the effective area. Triangular reinforcing walls 11,12 connecting the edges 7,9 and 8,10 of each mirror surface 4,5
Are provided halfway through the edges 7, 8, 9, 10 with the corner 6 as the top. Then, each edge portion 7, which does not have the reinforcing walls 11, 12, is provided.
The space formed by the portions 8, 9, and 10 has a configuration in which punched portions 13, 14 are provided.

The synthetic resin molded article 1 having the above configuration is provided with mirror surfaces 4 and 5
Of the mirror surface 4, 4a, 5a (the part where the reinforcing walls 11, 12 are provided) is blocked
The deformation force can be concentrated on the opening side sides 4b, 5b of 5 (portions where the reinforcing walls 11, 12 are not provided). Therefore, although the warpage of the opening sides 4b and 5b of the mirror surfaces 4 and 5 is increased, the warpage of the mirror surfaces 4 and 5 near the corners 4a and 5a of the mirror surfaces 4 and 5 is reduced. The amount of deformation of the corner 6 at an orthogonal angle becomes extremely small.

Further, heat dissipation from the punched portions 13 and 14 to the mold is increased, and the temperature difference between the mirror surfaces 4 and 5 and the anti-mirror surface side in the mold can be reduced, so that the warpage of the mirror surfaces 4 and 5 can be reduced. Can be reduced.

In the present embodiment, the shape of the mirror surfaces 4 and 5 is rectangular, but the present invention is not limited to this.
Synthetic resin molded products having various mirror surface shapes such as a trapezoidal synthetic resin molded product 15 as shown in FIGS. 3a and 3b and a W-shaped synthetic resin molded product 16 as shown in FIG. Similar effects can be obtained in a synthetic resin molded article 21 having a large number of mirror surfaces 17, 18, 19, 20 as shown in FIG.

Further, in this embodiment, the reinforcing walls 11 and 12 have a triangular shape. However, a synthetic resin molded product 23 having an arc-shaped reinforcing wall 22 as shown in FIG. 6 or a reinforcing resin article 23 as shown in FIG. V on wall 24
The same effect can be obtained with the synthetic resin molded article 25 having the shape.

Second Embodiment FIG. 8 is a partially omitted perspective view showing a second embodiment of the synthetic resin molded product of the present invention.

The reinforcing wall 27 of the synthetic resin molded product 26 shown in the present embodiment differs from the reinforcing walls 11 and 12 in the first embodiment by the edges 7, 9 and
The difference is that it is provided at the outer end (outside) of 8,10,
The other components have the same configuration, and the other components have the same reference numerals and description thereof will be omitted.

According to this embodiment, the same operation and effect as those of the first embodiment can be obtained.

(Third Embodiment) FIG. 9 is a partially omitted perspective view showing a third embodiment of the synthetic resin molded product of the present invention.

The reinforcing wall 29 of the synthetic resin molded article 28 shown in this embodiment is different from the first embodiment in that the reinforcing walls 11 and 12 in the first embodiment are formed larger and trapezoidal holes are formed, and the other configuration is the same. The other components and operations are denoted by the same reference numerals and description thereof is omitted.

According to the present embodiment, the amount of warpage around the mirror surfaces 4 and 5 can be reduced.

Fourth Embodiment FIG. 10 is a perspective view showing a fourth embodiment of the synthetic resin molded product of the present invention.

Reinforcing walls 31, 3 of the synthetic resin molded article 30 shown in the present embodiment
Reference numeral 2 denotes a large reinforcing wall 11, 12 in the first embodiment, which is provided on the entire edge portions 7, 8, 9, 10 and the reinforcing walls 31, 32.
In that slit-shaped cutouts 35 and 36 are provided on the opening sides 33 and 34 (on the side opposite to the corners 6) in the middle of the process, and the other configuration is the same. The operation is denoted by the same reference numeral and its description is omitted.

According to the present embodiment, by providing the slit-shaped cutouts 35, 36 in the reinforcing walls 31, 32, it is possible to absorb the deformation force generated on the mirror surfaces 4, 5 by opening and closing the cutouts 35, 36. And the same effects as those of the first embodiment can be obtained.
By providing the slit-shaped cutouts 35 and 36 and forming the reinforcing walls 31 and 32 to be large, it is possible to reduce the incidence of light rays from outside the reinforcing walls 31 and 32.

(Fifth Embodiment) FIG. 11 is a perspective view showing a fifth embodiment of the synthetic resin molded product 37 of the present invention.

Reinforcement walls 38, 3 of the synthetic resin molded article 37 shown in this embodiment
Reference numeral 9 designates cutouts 40 and 41 in which the slit-shaped cutouts 35 and 36 of the reinforcing walls 31 and 32 in the fourth embodiment (the end portions on the corners 6 side) are formed in a round shape. Other configurations are the same, and the other configurations and operations are denoted by the same reference numerals and description thereof is omitted.

According to the present embodiment, the same effects as those of the fourth embodiment can be obtained, and stress concentrated on the tip portions of the slit-shaped cutouts 35 and 36 can be prevented, and a structure having high strength can be obtained. .

(Sixth Embodiment) FIG. 12 is a perspective view of a synthetic resin molded product according to a sixth embodiment of the present invention, with a part thereof omitted.

The reinforcing wall 43 of the synthetic resin molded article 42 shown in the present embodiment has the corner portions 6 of the reinforcing walls 11 and 12 in the first embodiment and a spot facing portion 44 (through hole) provided near the corner portion 6. The difference is in the configuration, and the other components are the same, and the other components are denoted by the same reference numerals and description thereof will be omitted.

In the resin molded product 42 having the above-described configuration, the heat in the vicinity of the corner 6 is radiated from the spot facing portion 44 by providing the spot facing portion 44.

According to this embodiment, the heat near the corners 6 of the mirror surfaces 4, 5 is radiated, so that the amount of deformation of the mirror surfaces 4, 5 near the corners 6 due to the heat can be reduced.

(Seventh Embodiment) FIG. 13 is a partially omitted perspective view showing a seventh embodiment of the synthetic resin molded product of the present invention.

The synthetic resin molded product 45 shown in the present embodiment is different from the first embodiment in that insert molding is performed by interposing an elastic member 46 between the punched portions 13 and 14, and the other configuration is the same. Descriptions of other configurations and operations will be omitted.

According to the present embodiment, the elastic member 46 is interposed, so that the elastic member 46 is deformed following the deformation that occurs on the opening side 4a, 5a of the mirror surfaces 4, 5, so that the reinforcing wall 12 is formed. Light rays from the outside can be completely blocked.

In this embodiment, the elastic member 46 is insert-molded. However, the present invention is not limited to this.
May be provided in the cutout portions 13 and 14.

〔The invention's effect〕

As described above, according to the synthetic resin molded product of the present invention, a highly accurate optical reflecting mirror is formed in which the angle change near the mirror surface corner due to temperature change and humidity change during molding and use of the molded product is extremely small. Goods can be obtained.

[Brief description of the drawings]

1 and 2 show a first embodiment of a synthetic resin molded product according to the present invention. FIG. 11 is a perspective view, FIG. 2 is a front view, and FIGS. 3A shows a perspective view, FIG. 3B shows a plan view, FIG. 4 shows a partially omitted perspective view, FIG. 5 shows a perspective view, and FIG. 6 shows a modification of the first embodiment. Is omitted, FIG. 7 is a perspective view partially omitted,
FIG. 8 is a partially omitted perspective view showing the second embodiment, FIG. 9 is a partially omitted perspective view showing the third embodiment, and FIG.
FIG. 11 is a perspective view showing the fourth embodiment, FIG. 11 is a perspective view showing the fifth embodiment, FIG. 12 is a partially omitted perspective view showing the sixth embodiment, and FIG. 14a and 14b are front views each showing a conventional example, with a part of the perspective view showing the seventh embodiment omitted. 1,15,16,21,23,25,26,28,30,37,42,45,50 ... Synthetic resin molded product 2,3 ... Flat plate 4,5,17,18,19,20 ... Mirror surface 6: Corner 7, 8, 9, 10 ... Edge 11, 12, 22, 24, 27, 29, 31, 32, 38, 39, 43 ... Reinforcing wall 13, 14, 35, 36,40,41… Punch part 33,34 Open side 44… Counterbore part 46… Elastic member

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noboru Yamada 2-43-2 Hatagaya, Shibuya-ku, Tokyo Within O-limpus Optical Industry Co., Ltd. (72) Inventor Makio Yamada 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Oh-Limpus Optical Co., Ltd. (72) Kenji Haga Inventor 2-43-2 Hatagaya, Shibuya-ku, Tokyo In-Olympus Optical Industry Co., Ltd. (72) Hiromasa Kobayashi 2-43-2, Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd. (56) References JP-A-53-40057 (JP, A) JP-A-52-143041 (JP, A) JP-A-3-83620 (JP, A) JP-A-2 -186112 (JP, A) JP-A-3-151218 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B29C 45/00-45/17 B29C 39/00 B29D 11/00

Claims (2)

(57) [Claims] 1. A molded article of a synthetic resin molded article having two intersecting planes as optical reflecting mirror surfaces, wherein edges are provided at both ends outside the effective area of each of the reflecting mirror surfaces, and the two intersecting surfaces are provided. A reinforcing wall connecting the respective edges with a corner formed by a plane as a top is provided, and the reinforcing wall is formed at each edge of the reflection mirror surface opened on the opposite side to the corner. A synthetic resin molded article characterized in that it is provided with a cutout portion not connected to the molded article. 2. The synthetic resin molded product according to claim 1, wherein an elastic member is interposed in said cutout portion.