JPS6239808A - Optical forming parts - Google Patents

Abstract

PURPOSE:To improve the built-in accuracy by forming a part which is not graded, in a prescribed part of the surface having a draft angle, of optical forming parts which are formed by using a mold. CONSTITUTION:On a square type concave lens 10, faces 10a, 10b having a curvature are formed with radiuses of curvature R1, R2, respectively. Also, side faces 10c, 10d of the concave lens 10 are provided with a draft angle for reducing a mold releasing resistance, when drawing it out of a mold. On a draft angle surface of the side face 10d, plural pieces of grooves 10e are provided in the direction X being parallel to an optical axis of the concave lens 10. In this state, when integrating the concave lens into a product, a holding surface 2a of a holding member 2 is made to abut on and held in the groove 10e which has been formed on this surface being a draft angle surface, based on the side face 10d of the concave lens 10 as a reference.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to optical molded parts, particularly optical molded parts molded by injection molding of resin, compression molding, press molding of glass, etc. using a mold. It is something.

(Prior Art) Fig. 5 0), (b), and C→ are examples of optical parts molded using conventional molds, and show rectangular lenses. here,
1 is a lens, 1a and 1b are surfaces with draft angles,
It usually has an inclination of f~5°. Conventionally, when pulling out the lens 1 from a mold made of metal or the like, a drafting device m+1b has been applied to reduce the separation resistance and prevent the shape accuracy of the molded lens 1 from becoming distorted. In addition, Figures 60) and 6(b) show a support method when assembling an optical component as shown in Figure 5 into a product, 2 is a holding member, and 2a is a holding surface of the holding member. ing. When holding the surface 1b of this type of optical member with a draft angle as a reference surface, as shown in FIG. It is necessary to form it in accordance with the slope of .

Therefore, the processing of the holding member 2 itself is troublesome, and the reliability of assembly accuracy is low. On the other hand, as a solution for manufacturing accuracy, for example, as shown in FIG. 6 (b), there is a method in which no draft angle is provided on the reference surface 1b of the optical component that comes into contact with the holding surface 2& of the holding member 2. There is. However, with such a structure, an imbalance in mold release resistance occurs when the optical component is extracted from the mold, resulting in a problem with the shape accuracy of the optical component. Another method is to use a slide piece in the mold that forms the side surface that becomes the reference surface of the optical component, and slide the slide piece before pulling out the optical component from the mold to easily pull out the optical component. It has the disadvantage of being complicated.

(Problems to be Solved by the Invention) The present invention has been made for the purpose of solving the above-mentioned conventional problems,
The present invention provides an optical molded part that can be extracted with a simple mold structure and with low mold release resistance, and has excellent assembly accuracy and shape accuracy.

(Means for Solving the Problems) As a means for solving the problems described above, the present invention provides an optical molded part that is molded using a mold and has a draft angle. The gist is to provide a non-gradient portion at a predetermined location on at least one surface having a slope.

(Function) By adopting the above configuration, when taking out the mold from the mold, it can be taken out smoothly due to the draft angle, preventing deterioration of shape accuracy, and also removing parts without the draft angle. By using it as a reference surface when assembling it into a product, it is possible to improve the assembling accuracy.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

1 to 3 are diagrams showing an example of an optical molded part according to the present invention, where 10 is a square concave lens, 10m and ]Ob are surfaces having the curvature of the concave lens 10, and the radius of curvature R,... R
Consists of 2. 10c and 10d are the side surfaces of the concave lens 10,
A draft angle is applied to keep the mold release resistance low when pulling out from the mold.

] Oe is a side surface] A plurality of grooves are provided in the draft surface of Od, and a plurality of grooves are provided in a direction (X direction) parallel to the optical axis of the concave lens 10 . Here, when the concave lens 10 is assembled and held in a product, the side surface 10d of the concave lens 10 is
The groove 10 formed on this surface, which is the draft surface, is based on
The concave lens 10 is held by bringing the holding surface 2a of the holding member 2 into contact with e.

At the time of mounting, a spring or the like is pressed against the top and side surfaces of the concave lens 10 to fix it. Therefore, as shown in FIG. 3, there is no need to process the holding surface 2a of the holding member 2 according to the draft angle, and the processing accuracy of the holding member 2 can be improved by forming it parallel to the optical axis X of the concave lens 10. Concave lens 1
It is also possible to improve accuracy when 0 is incorporated and held. Further, the groove 10e provided on the side surface 10d is formed on the side surface 10c and 10.
Since it is only a few inches to a few inches of the entire side surface made up of d, the mold release resistance when extracting the concave lens from the mold is the groove.
Formation of Oe does not increase significantly. Therefore, there is almost no deviation in the shape accuracy of the concave lens 10 that is molded and extracted from the mold.

FIG. 4 shows another embodiment of the optical molded part according to the present invention, and since all the reference numerals in the figure refer to the same members as in the previous embodiment, the explanation thereof will be omitted here. Here, of the side surface 10d provided with a draft angle, only the area in contact with the holding surface 2a of the holding member 2 is made substantially flat with the optical axis of the lens 10, and the proportion of the portion without a draft angle is further reduced. In addition, the shape accuracy of the lens 10 is maintained by eliminating deviations due to extraction, and
The assembly accuracy is also good.

Although the present optical molded parts shown in Figures 1 to 4 are rectangular concave lenses, the present invention is applicable to any molded optical parts such as lenses of other shapes or prisms. I can do it.

In addition, various types of molds may be used depending on the materials and processing conditions for molding optical parts, such as metal molds and ceramic molds. The area, position, etc. of the portion of the surface that is not provided with a draft angle are determined as appropriate, taking into consideration the relationship between the holding member and the holding surface of the member when the optically molded component is assembled. Therefore, although grooves or flat surfaces are formed in the two embodiments described above, for example, convex flat surfaces may be provided in predetermined regions of the draft.

(Effects of the Invention) As explained above, the present invention enables the use of a reference surface when incorporating and holding an optically molded part such as a lens or prism molded using a mold using a surface with a draft angle as a reference surface. By forming a predetermined portion of this surface without a draft angle and approximately parallel to the optical axis of the optical molding part, the mold release resistance when pulled out from the mold is small and the shape accuracy is not distorted, as in the conventional method. do not have.

In addition, the assembly accuracy can be greatly improved, making it an excellent optical molded part.

[Brief explanation of the drawing]

FIG. 1 shows a lens according to the present invention, where 0) is a plan view;
(B) is a front view, (C) is a side view, FIG. 2 is a perspective view showing the holding state of the lens according to the present invention, FIG. 3 is a side view of the same, and FIG. FIG. 5 is a cross-sectional view of the main parts showing the holding state of the lens according to the embodiment, FIG. 5 shows the lens in the conventional example, FIG.
6(c) is a side view, and FIGS. 6(a) and 6(b) are both side views showing the state in which the lens is held in a conventional example. 1.10...Optical molded parts (lens), 10C110
d...Side surface, 10@...Part without draft angle,
2... Holding member, 2a... Holding surface. Figure 1 Figure 2 Figure 3, Ω ヱ ■ Procedural amendment May 27, 1986 Michibe Uga, Commissioner of the Patent Office 1, Indication of case Patent application No. 179475 1988 2, Name of invention Optical molding Part 3, Relationship with the person making the amendment Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (10
0) Canon Co., Ltd. 4. Agent address: 40 Mori Building, Toranomon, 5-13-1 Toranomon, Minato-ku, Tokyo (Hakoma, the correctional address) 6. Claims column of the specification to be amended and Detailed Description of the Invention Column 7, Contents of Amendment (1) The entire text of the Claims column is amended as shown in the attached (Corrected Claims). (2) "Ordinary optical components" in Section 2, Line 12 of the specification shall be corrected to "Optical components." (3) From the 17th line to the 19th line of the same paragraph 4, ``φ conflict of the concave lens 10...holding surface 2a'' is changed to ``With reference to the groove 10e formed on the side surface 10d of the concave lens, The holding surface 2a of the holding member 2 is corrected as ". (4) Paragraph 6, line 19 to paragraph 7, line 4, ``The optical molded parts... will not go out of order.'' By providing a portion of the surface that is not sloped at a predetermined location, the mold release resistance during extraction from the mold can be reduced, and the shape accuracy will not be disrupted." , Claim (1) In an optical molded part molded using a mold and provided with a draft angle, a portion without a slope is formed at a predetermined location on at least one surface of the optical molded part that has a draft angle. Optical molded parts characterized by: (2) The optical molded component according to claim 1, wherein one of the non-gradient portions is a reference surface for assembly and is substantially parallel to the optical axis of the optical molded component. that's all

Claims (2)

[Claims] (1) In an optical molded part that is molded using a mold and has a draft angle, a part without a slope is formed at a predetermined location on at least one surface of the optical molded part that has a draft angle. Characteristic optical molded parts. (2) The optical molded component according to claim 1, wherein one of the surfaces having the draft angle is a reference surface during assembly and is substantially parallel to the optical axis of the optical molded component.