JP2009047949A - Manufacturing method of optical element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an optical element capable of preventing the occurrence of burrs upon cutting a large-sized body into individual optical elements. <P>SOLUTION: The manufacturing method of the optical element comprises: a process to form a large-sized spacer 4 where surrounding parts 21, each of which surrounds an area with an optical functional surface 32 arranged therein and has a rectangular outer shape, are arrayed at prescribed intervals from one another through a linking part 22 that is arranged so as not to cover the corner parts of the surrounding parts; a process to fill with adhesive 23 a grid-shaped area of the large-sized spacer wherein the linking part is arranged between the surrounding parts, and to place a first large-sized substrate 2 and a second large-sized substrate 3 opposite to each other across the large-sized spacer and bond them to form a large-sized body 1; and a process to cut the area between the surrounding parts of the large-sized body into grid shapes, then, to form the optical element 5 comprising the first substrate having the optical function surface and the second substrate facing the first substrate through the spacer having the surrounding part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an optical element in which a spacer is provided between substrates on which optical functional surfaces are formed, and in particular, by cutting a large body in which a plurality of structures to be a plurality of optical elements are arranged in a lattice shape to obtain an optical The present invention relates to a method for manufacturing an optical element for forming an element.

Conventionally, in order to efficiently manufacture an optical element having an optical function surface such as a lens used in a camera or the like, a plurality of optical function surfaces are arranged in a lattice pattern at a predetermined interval on a large substrate, and a region between the optical function surfaces is diced. A manufacturing method is known in which individual optical elements are formed by cutting vertically and horizontally. As a method for manufacturing such an optical element, for example, there is a method described in Patent Document 1.
JP 2003-125295 A

  Here, an optical element having a first substrate having an optical functional surface and a second substrate facing the first substrate via a spacer is known. With respect to such an optical element, a large body composed of a first large substrate having a plurality of optical functional surfaces arranged in an array and a second large substrate opposed to the first large substrate through a large spacer is obtained by dicing. Cutting to form individual optical elements.

  FIG. 7 shows a plan view of a first large substrate and a large spacer in the conventional manufacturing method. The first large-sized substrate 51 is made of flat glass, and a plurality of lens surfaces 53 as optical functional surfaces are arranged in an array on at least one surface. The large spacer 52 is formed of a metal plate having substantially the same outer shape as that of the first large substrate 51, and the surrounding portion 54 surrounds a position corresponding to the lens surface 53 formed on the first large substrate 51. A plurality of the surrounding portions 54 are arranged in an array. The plurality of surrounding portions 54 are provided so as to correspond to the respective lens surfaces 53 of the first large-sized substrate 51 and are arranged so as to have a predetermined distance from each other. The adjacent surrounding portions 54 are connected by the connecting portions 55. Suspended. The connecting portion 55 is provided at an intersecting portion of the region between the surrounding portions 54 extending vertically and horizontally, and suspends the adjacent surrounding portions 54. For this reason, the connecting portion 55 is formed so as to cover the four corners of each surrounding portion 54.

  Although the second large substrate is not shown in FIG. 7, it is formed in the same manner as the first large substrate 51, a large spacer 52 is disposed on the back side of the first large substrate 51, and a second large substrate is disposed on the back side. FIG. 8 is a plan view showing a state in which the first large substrate 51 and the large spacer 52 are overlapped. When the first large substrate 51 and the large spacer 52 are overlapped, an adhesive 57 (shown by hatching) is filled in the region between the surrounding portions 54 where the connecting portions 55 are provided, and the second large substrate is overlapped to form three sheets The large plate 50 is formed by bonding the plates.

  After the large format 50 is formed, this is cut to form an optical element. First, as shown in FIG. 9, the region between the surrounding portions 54 is cut by dicing in the horizontal direction in the drawing. Reference numeral 58 represents a second large substrate facing the first large substrate 51. The cutting width is slightly narrower than the width between the surrounding portions 54, and the vicinity of the end portion of the connecting portion 55 of the adhesive 57 and the large spacer 52 is exposed on the cut surface. That is, the uncut portion 59 of the connecting portion 55 has an end surface that constitutes a part of the cut surface.

  If the area | region between the surrounding parts 54 is cut | disconnected in the horizontal direction in a figure, as shown in FIG. 10, the said area | region will be cut | disconnected by dicing in the vertical direction in the figure. At this time, since it has already been cut in the lateral direction, there is a space between the cut surface in the lateral direction and the opposite cut surface. Accordingly, when the region between the surrounding portions 54 is cut in the vertical direction in the figure, the dicing blade cuts the remaining portion of the connecting portion 55 from the space portion, and subsequently the region filled with the adhesive. It cut | disconnects, the part which was left uncut of the connection part 55 which touches a space part is cut | disconnected, and it reaches | attains a space part again.

  However, in the conventional manufacturing method, before the dicing blade reaches the space portion, the remaining portion of the connecting portion 55 whose end surface faces the space portion is cut. A metal burr 56 was generated in the direction. If burr occurs in this way, it may become an obstacle when the optical element is incorporated in an optical device in the subsequent process, and after it has been incorporated, the burr enters the optical system and causes problems such as degradation of optical performance. There are things to do.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for manufacturing an optical element capable of preventing the generation of burrs when cut from a large size to obtain individual optical elements. .

In order to solve the above-described problems, an optical element manufacturing method according to the present invention includes a first large-sized substrate in which a plurality of optical functional surfaces are arranged in an array at predetermined intervals, and the first large-sized substrate and the large-sized spacer. In a manufacturing method of an optical element in which a large body composed of an opposing second large substrate is cut into a lattice shape to form individual optical elements,
Enclosures having an outer shape that surrounds the area where the optical functional surface is arranged are arranged in an array with a predetermined interval from each other via a connecting part arranged so as not to cover a corner of the enclosure part. Forming a large spacer to be disposed;
An adhesive is filled in a region between the surrounding portions in which the connecting portions of the large spacers are arranged and formed in a lattice shape, and the first large substrate and the second large substrate are opposed to each other through the large spacers and bonded. Forming a large format,
By cutting a region between the surrounding surrounding portions of the large size into a lattice shape, the first substrate having an optical functional surface and a second substrate facing the first substrate through a spacer having the surrounding portion are formed. Forming an optical element;
It is characterized by having.

  Further, in the method of manufacturing an optical element according to the present invention, the connecting portion is arranged at a position closer to the center side than both end portions of each side of the surrounding portion, and the large size is formed so as to suspend between the surrounding surrounding portions. A spacer is formed.

  According to the method for manufacturing an optical element according to the present invention, the large-sized spacers are arranged so that the surrounding portions are arranged at a predetermined interval from each other via the connecting portions that are arranged so as not to cover the corner portions of the surrounding portions. When the region between the surrounding parts is cut, the optical element is formed by filling the region between the surrounding parts with an adhesive and cutting the region between the formed large-sized surrounding parts. In addition, since it is possible to prevent the connecting portion from coming into contact with the space portion formed by being cut in one direction, the connecting portion is always cut in a state where the adhesive exists behind the cutting direction. Generation | occurrence | production of the burr | flash accompanying cutting | disconnection can be prevented.

  Further, according to the method for manufacturing an optical element according to the present invention, the connecting portion is arranged at a position closer to the center than both ends of each side of the surrounding portion, and the large format spacer is suspended so as to suspend between the surrounding surrounding portions. As a result, it is possible to prevent the connecting portion from coming into contact with the space portion, regardless of the direction in which the region between the surrounding portions in a lattice shape is cut. Occurrence can be prevented.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a cross-sectional view of an optical element 5 formed by the manufacturing method of the present embodiment. As shown in this figure, in the optical element 5, the first substrate 30 and the second substrate 33 are opposed to each other via a spacer 36, and the first lens surface 31 is formed on the surface facing the outside of the first substrate 30. The second lens surface 32 is formed on the opposite surface, the third lens surface 34 is formed on the surface of the second substrate 33 facing the first substrate 30, and the fourth lens is formed on the opposite surface. Lens surfaces 35 are formed respectively.

  Both the first substrate 30 and the second substrate 33 are made of a transparent glass plate, and the spacer 36 is formed of a metal plate. A region between the lens portions of the spacer 36 is a space portion, and light can be transmitted between the first substrate 30 and the second substrate 33. The concave region surrounded by the outer walls of the first substrate 30, the second substrate 33 and the spacer 36 has an adhesive 23, whereby the first substrate 30, the second substrate 33 and the spacer 36 are bonded and fixed. is doing.

  Next, a method for manufacturing such an optical element 5 will be described. In the manufacturing method of the present embodiment, the large body 1 including the first large substrate 2, the second large substrate 3, and the large spacer 4 is formed, and the optical element 5 is formed by cutting the large body 1. FIG. 2 shows a plan view of the first large substrate 2, the second large substrate 3, and the large spacer 4. As shown in this figure, the first large-sized substrate 2 has an outer shape formed in a substantially square shape, and a plurality of first lens surfaces 31 and a plurality of second lens surfaces 32 are formed on the surface, and these are arranged at predetermined intervals vertically and horizontally. Are arranged in an array having The first lens surface 31 is formed at the same position on the back side surface in the drawing, and the second lens surface 32 is formed at the same position on the front side surface in the drawing. The second large substrate 3 has the same outer shape as the first large substrate 2 and has the same arrangement as the first lens surface 31 and the second lens surface 32 on the surface, and the third lens surface 34 and the fourth lens on the surface. A plurality of lens surfaces 35 are formed.

  The large spacer 4 is formed in a substantially square shape whose outer shape is slightly smaller than that of the first large substrate 2, and the peripheral edge portion is formed as a frame-shaped frame portion 20. A plurality of surrounding portions 21 are arranged inside the frame portion 20. The surrounding portion 21 is formed in a rectangular shape so as to surround a region where the first lens surface 31 and the second lens surface 32 are arranged when the large spacer 4 is overlapped with the first large substrate 2. Since the surrounding portions 21 are formed so as to correspond to the respective lens surfaces of the first large-sized substrate 2, they are arranged in an array having predetermined intervals in the vertical and horizontal directions. Accordingly, the region between the surrounding portions 21 is formed in a lattice shape that intersects vertically and horizontally.

  A narrow connecting portion 22 is formed between adjacent surrounding portions 21 of the large spacer 4 so as to connect them. In addition, with respect to the outermost peripheral surrounding portion 21, a narrow connecting portion 22 is formed so as to suspend the side facing the frame portion 20 and the frame portion 20. The connecting portion 22 is formed at a position that does not cover the corner portion of the surrounding portion 21. Specifically, two connecting portions 22 are provided for each side of the surrounding portion 21, and the surrounding portions 21 are respectively located from both ends of one side of the surrounding portion 21 and at a predetermined distance from the corner portion. It extends in a direction orthogonal to one side and extends to the opposing surrounding part 21 or frame part 20.

  The large spacer 4 is formed of a metal plate, and is formed by processing a sheet metal by means such as pressing or laser cutting. The large spacer 4 is not limited to a metal material, and may be a resin processed product, for example. In that case, the spacer 36 of the completed optical element 5 is also made of a resin material.

  Next, the first large substrate 2, the second large substrate 3 and the large spacer 4 are integrated. FIG. 3 is a plan view showing a state in which the large spacers 4 are superposed on the first large substrate 2. As shown in this figure, when the large spacer 4 is superimposed on the first large substrate 2, the surrounding portion 21 of the large spacer 4 is formed with the first lens surface 31 and the second lens surface 32 of the first large substrate 2. Arranged to surround the area. In addition, the region between the surrounding portions 21 where the connecting portions 22 are formed and the region between the surrounding portion 21 and the frame portion 20 are filled with an adhesive 23 so as to fill the space (indicated by hatching in the figure). ).

  When the adhesive 23 is filled, the second large substrate 3 is overlaid on the large spacer 4 so as to face the first large substrate 2. As a result, the first large-sized substrate 2, the second large-sized substrate 3, and the large-sized spacer 4 are bonded and integrated by the adhesive 23 to form the large-sized body 1. FIG. 4 shows a cross-sectional view of the large format 1. As shown in this figure, in the large format 1, the lens portions formed on the first large format substrate 2 and the second large format substrate 3 face each other, and a space is formed between them. An area surrounded by the first large-sized substrate 2 and the second large-sized substrate 3 and the outer wall of the surrounding portion 21 or the inner wall of the frame portion 20 is filled with an adhesive 23.

  Next, the large body 1 is cut to form the optical element 5. FIG. 5 is a plan view of the large format 1 showing a state in which the large format 1 is cut in the horizontal direction. In the large format 1, regions between the surrounding portions 21 and between the surrounding portion 21 and the frame portion 20 are cut by dicing. The region cut by dicing is slightly narrower than the region between the surrounding portions 21 and the region between the surrounding portion 21 and the frame portion 20, so that the adhesive 23 remains on the outer wall of the surrounding portion 21, and the first large format is formed. The state where the substrate 2, the second large format substrate 3, and the large format spacer 4 are bonded is maintained.

  Subsequently, the large format 1 is also cut in the vertical direction to form the optical element 5. FIG. 6 is a plan view of the large format 1 in which the large format 1 is cut in the vertical direction. In this figure, reference numerals a to e are respectively attached to five columns forming the region between the surrounding portions 21 and between the surrounding portion 21 and the frame portion 20, and for the sake of explanation, the respective rows are different from each other. It shows a disconnected state.

  6 is a region sandwiched between the inner wall of the right side of the frame portion 20 and the outer wall of the surrounding portion 21 arranged at the right end, and in this figure, dicing is performed over the entire length. It shows a disconnected state. Similarly, the second column from the right represented by the symbol b is cut by dicing over the entire length. Thereby, the part which has the four surrounding parts 21 arrange | positioned at the right end is cut | disconnected from the large format 1 individually, and the optical element 5 shown in FIG. 1 is formed.

  Three columns represented by symbols c to e in FIG. 6 indicate a cutting process by dicing. A column denoted by reference character c shows a state in which the large format 1 is cut from the upper end in the drawing and is cut to a position immediately before the connecting portion 22 is first cut. Further, the column represented by the symbol d in FIG. 6 is further cut from the column represented by the symbol c, and is in a state where it has been cut to a position immediately before the second connecting portion 22 is cut from the top in the drawing. Show. When the cutting is further advanced from the cutting position indicated by the column c in FIG. 6, the adhesive 23 is filled behind the cutting portion 22 to be cut, so that it is indicated by the column d. The connecting portion 22 is not deformed rearward in the cutting direction, and no burrs are generated.

  In addition, the column represented by the symbol e in FIG. 6 shows a state where the cutting is further advanced from the column represented by the symbol d, and has already been cut in the horizontal direction to become a space portion. . Even when further cutting is performed from the cutting position shown in the row indicated by the symbol d, the adhesive 23 is filled behind the cutting direction of the second connecting portion 22 to be cut and has already been cut in the horizontal direction. Since the connecting portion 22 is not disposed at the portion in contact with the space portion, there is no occurrence of burrs due to the cutting of the connecting portion 22 as shown in the row of the symbol e.

  As described above, when the large spacer 4 is formed, the connecting portion 22 is formed so as not to be applied to the corner portion of the surrounding portion 21, so that the connecting portion 22 does not contact the space portion by cutting in one direction. When cutting in a direction orthogonal to the cutting direction of the adhesive portion 23, the adhesive 23 is always filled in the rear of the connecting portion 22 in the cutting direction, so that generation of burrs due to the cutting of the connecting portion 22 is prevented. Can do. In addition, two connecting portions 22 are provided on each side of the surrounding portion 21, and both of them are arranged closer to the center of the side than the corner portion of the surrounding portion 21, so that the region between the surrounding portions 21 is any Even if it is cut in the direction, it is possible to reliably prevent burrs from occurring in the connecting portion 22.

  Although the embodiment of the present invention has been described above, the application of the present invention is not limited to this embodiment, and can be applied in various ways within the scope of its technical idea. For example, the configuration of the lens surfaces formed on the first large substrate 2 and the second large substrate 3 is not limited to that of the present embodiment, and an optical functional surface is formed on at least one surface of the first large substrate 2. Just do it. In addition, the number and arrangement of the multiple chamfers of the optical element 5 in the large format 1 can be arbitrarily set as long as the connecting portion 22 is arranged at a portion other than the corner portion of the surrounding portion 21.

It is sectional drawing of the optical element formed by the manufacturing method of this embodiment. It is a top view of a 1st large format board, a 2nd large format board, and a large format spacer. It is a top view in the state where the large format spacer was superimposed on the first large format substrate. It is sectional drawing of a large format. It is a top view of a large format, and is a figure of the state which cut | disconnected the large format in the horizontal direction. It is a top view of a large format, and is a figure of the state which cut | disconnected the large format in the vertical direction. It is a top view of the 1st large format board | substrate and large format spacer in the conventional manufacturing method. It is a top view of the state which overlap | superposed the 1st large format board | substrate and the large format spacer in the conventional manufacturing method. It is a figure of the state which cut | disconnected the large format in the conventional manufacturing method in the horizontal direction. It is a figure of the state which cut | disconnected the large format in the conventional manufacturing method in the vertical direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Large format 2 1st large format board 3 2nd large format substrate 4 Large format spacer 5 Optical element 10 Lens surface 20 Frame part 21 Enclosure part 22 Connection part 23 Adhesive 50 Large format 30 1st board | substrate 31 1st lens surface 32 2nd lens Surface 33 Second substrate 34 Third lens surface 35 Fourth lens surface 36 Spacer

Claims (2)

A large body composed of a first large substrate having a plurality of optical functional surfaces arranged in an array at predetermined intervals and a second large substrate facing the first large substrate through a large spacer is cut into a lattice and individually In the method of manufacturing an optical element as an optical element,
Enclosures having an outer shape that surrounds the area where the optical functional surface is arranged are arranged in an array with a predetermined interval from each other via a connecting part arranged so as not to cover a corner of the enclosure part. Forming a large spacer to be disposed;
An adhesive is filled in a region between the surrounding portions in which the connecting portions of the large spacers are arranged and formed in a lattice shape, and the first large substrate and the second large substrate are opposed to each other through the large spacers and bonded. Forming a large format,
By cutting a region between the surrounding surrounding portions of the large size into a lattice shape, the first substrate having an optical functional surface and a second substrate facing the first substrate through a spacer having the surrounding portion are formed. Forming an optical element;
A method for producing an optical element, comprising:   2. The large spacer is formed so that the connecting portion is disposed at a position closer to the center side than both ends of each side of the surrounding portion, and the surrounding surrounding portions are suspended. The manufacturing method of the optical element of description.

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