JP2007163960A - Optical device, optical unit, manufacturing method of optical device and manufacturing method of optical unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an optical device base material from being cracked caused by the joining of a resin layer in an optical device and its manufacturing method. <P>SOLUTION: In a resin joining type optical device 1 having the optical device base material 2 and a resin layer 3 joined to the optical device base material 2, the optical device base material 2 has a mirror face 2a at its flank 2c and an end part 3a of the resin layer 3 is located at the mirror face 2a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin-bonded optical element, an optical unit, an optical element manufacturing method, and an optical unit manufacturing method.

  Conventionally, there are resin-bonded optical elements in which a resin is bonded to an optical element substrate such as a glass lens or a plastic lens. In this resin-bonded optical element, for example, Patent Document 1 proposes the following hybrid lens.

In this hybrid lens, a resin layer is integrally formed on the optical element substrate. Here, a V-shaped groove is formed on the edge surface of the optical element substrate, and an end portion of the resin layer is positioned in the V-shaped groove. The wall surface of the V-shaped groove has a satin finish or a grain finish.
No. 1-9922

  By the way, in the hybrid lens of the above-mentioned Patent Document 1, the resin layer is bonded on a textured surface or a grained surface. In such a resin-bonded optical element, for example, in a low temperature state, the shrinkage of the resin is larger than the shrinkage of the optical element substrate. In particular, the contraction force becomes strong at the portion that contacts the end of the resin layer. Therefore, the optical element base material sometimes cracked from this portion.

  This invention is made | formed in view of the said problem, and makes it a subject to provide the optical element which prevents the crack of an optical element base material, an optical unit, the manufacturing method of an optical element, and the manufacturing method of an optical unit.

  In order to solve the above problems, an optical element of the present invention is a resin-bonded optical element having an optical element substrate and a resin layer bonded to the optical element substrate. At least a part of the side surface has a mirror surface, and the end portion of the resin layer is positioned on the mirror surface.

Preferably, the optical element substrate has the mirror surface on the entire side surface.
Moreover, it is good to set it as the structure whose surface roughness (Ra) of the said mirror surface is 5 micrometers or less.
The optical element base material may have a chamfered portion formed between the optical surface and the side surface.

  The outer shape of the resin layer in a cross section perpendicular to the optical axis of the optical element substrate may be rotationally asymmetric, and at least three portions distributed in a range of at least 180 ° may be concentric.

Further, it is preferable that the outer peripheral portion of the optical element substrate in a cross section perpendicular to the optical axis of the optical element substrate is circular, and the circularity of the circle is 0.1 mm or less.
Moreover, it is good to set it as the structure which has a light shielding part in the said mirror surface.

In order to solve the above-mentioned problems, an optical unit of the present invention has a configuration including an optical element having any one of the above-described configurations and a lens frame that holds the optical element.
In order to solve the above-described problems, a first optical element manufacturing method of the present invention is a method for manufacturing a resin-bonded optical element in which a resin layer is bonded to at least a part of an optical element substrate. The optical element base material having the above is prepared, a resin is supplied onto the optical element base material, and the resin layer is pressed to form the resin layer whose end abuts against the mirror surface.

  Preferably, an optical element base material having a mirror surface on the side surface and a lens frame are prepared, and the optical element base material and the lens frame are fixed by forming the resin layer having an end abutting on the mirror surface. Like that.

  In order to solve the above problems, a second optical element manufacturing method of the present invention includes a step of supplying a resin to an optical surface in the method of manufacturing a resin-bonded optical element, pressing the resin, and A step of spreading the resin on the optical surface and a step of curing the resin, wherein the step of pressing the resin comprises a step of causing the resin to overflow from the optical surface toward a side surface following the optical surface. The curing step includes curing when the overflowed resin reaches the mirror surface of the side surface.

  In order to solve the above-described problems, the method for manufacturing an optical unit of the present invention includes the steps of the method for manufacturing the second optical element, and a holding surface outside the optical surface before the step of supplying the resin. And the step of spreading the resin is to press the resin so that the resin is filled between the side surface and the holding surface.

  In the present invention, the position where the end of the resin layer is located is a mirror surface. Here, since there is substantially no scratch like a rough surface on the mirror surface, the optical element substrate is not easily cracked even if the shrinkage force of the resin layer is applied. Therefore, according to the present invention, it is possible to effectively prevent cracking of the optical element substrate.

Hereinafter, an optical element and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a resin-bonded optical element according to the first embodiment of the present invention.

  In the figure, a resin-bonded optical element 1 has an optical element substrate 2 and a resin layer 3 bonded to the optical element substrate 2. The optical element substrate 2 has a concave optical surface 2b on the upper surface, a flat surface 2d on the lower surface, and a flat side surface 2c. Here, a mirror surface 2a is formed on a part of the side surface 2c from the upper surface toward the lower surface. The resin layer 3 covers the concave optical surface 2b of the optical element substrate 2, and the end 3a of the resin layer 3 is located within the range of the mirror surface 2a. Here, the surface roughness Ra of the mirror surface 2a is, for example, 5 μm or less.

  Here, the mirror surface means that the surface roughness is very small, and it does not mean that a treatment (for example, mirror coating) that performs a reflection action is performed. Moreover, although the area | region of the mirror surface 2a is shown with the thick line in the figure, there is not necessarily a physical shape change (for example, level | step difference) in a thick line part and an other than that part. That is, the side surface 2c is one plane from the upper surface side to the lower surface side. However, there is a difference in surface roughness between the mirror surface 2a and other portions.

  Thus, in the resin-bonded optical element 1 according to the present embodiment, the end 3a of the resin layer 3 is located on the mirror surface 2a of the optical element substrate side surface 2c. Here, the mirror surface 2a is substantially free from scratches such as a rough surface. Therefore, even if the shrinkage force of the resin layer 3 is applied to the side surface 2c due to the temperature change (for example, when the temperature is low), the side surface 2c is not easily cracked. Therefore, according to the resin-bonded optical element 1 according to the present embodiment, it is possible to effectively prevent the optical element substrate 2 from cracking.

Moreover, the crack of the optical element base material 2 can be further prevented by setting the surface roughness Ra of the mirror surface 2a of the optical element base material 2 to 1 μm or less, more preferably 0.5 μm or less.
In forming the resin layer 3, first, the resin is supplied (dropped) onto the concave optical surface 2b. Subsequently, the resin is pressed with a mold. Then, the resin overflows from the concave optical surface 2b, and its end portion is transmitted along the side surface 2c. Here, the amount of resin to be supplied is an appropriate amount in advance. Therefore, the resin stops at an arbitrary position in the mirror surface 2a, and the end portion 3a is formed. Thus, when the resin layer 3 is molded, it is only necessary to supply (drop) the resin and press the resin with a mold. Therefore, a complicated molding process is not required. Further, since it is not necessary to provide a resin reservoir on the side surface 2c of the optical element substrate 2, the structure of the mold and the structure of the resin bonded optical element 1 are simplified.

FIG. 2 is a cross-sectional view showing a resin-bonded optical element according to a modification of the first embodiment of the present invention.
In the resin-bonded optical element 11 according to this modification shown in the figure, the optical element substrate 12 is a convex optical surface 12b, and the mirror surface 12a of the optical element substrate 12 is formed on the entire side surface 12c. Only the differences are different from the first embodiment, and detailed description thereof is omitted.

  Also in the resin-bonded optical element 11 according to this modification, the end 13a of the resin layer 13 is located on the mirror surface 12a. Therefore, even if the contraction force of the resin layer 13 is applied to the side surface 12c due to the temperature change (for example, in a low temperature state), the side surface 12c is not easily cracked. Therefore, according to the resin-bonded optical element 11 according to this modification, it is possible to effectively prevent the optical element substrate 12 from cracking.

  In the resin-bonded optical element 11 according to this modification, the mirror surface 12a is formed on the entire side surface 2c. For this reason, the allowable range of the arrival position of the end portion 13a of the resin layer 13 becomes wider. In this case, as compared with the first embodiment, the allowable range of the error between the supplied resin amount and the specified amount is widened. Therefore, the molding of the resin layer 13 becomes easier.

FIG. 3 is a sectional view showing a resin-bonded optical element according to the second embodiment of the present invention.
The resin-bonded optical element 21 shown in the figure has an optical element base material 22 and a resin layer 23 bonded so as to be in close contact with a part of the optical element base material 22. Moreover, the optical element base material 22 has a mirror surface 22a on the entire side surface 22c. And the edge part 23a of the resin layer 23 is located in this mirror surface 22a. Here, the surface roughness Ra of the mirror surface 22a is, for example, 5 μm or less.

  Further, the upper surface of the optical element substrate 22 includes an optical surface 22b and a flat surface portion 22d formed outside the optical surface 22b. Further, a curved chamfered portion 22e is formed between the optical surface 22b and the side surface 22c, more specifically, at a corner between the flat surface portion 22d and the side surface 22c.

  As described above, in the resin-bonded optical element 21 according to the present embodiment, the curved chamfered portion 22e is formed at the corner between the flat portion 22d and the side surface 22c. By doing in this way, at the time of shaping | molding of the resin layer 23, there exist the following effects. In the molding of the resin layer 23, first, the resin layer 23 is supplied to the optical element substrate 22, for example, the optical surface 22b. Subsequently, the resin is spread from the optical surface 22b toward the side surface 22c by the mold, and the resin layer 23 is formed. At this time, the presence of the curved chamfered portion 22 e can prevent gas from being mixed between the resin layer 23 and the optical element base material 22. As a result, the accuracy of the thickness (outer diameter) of the resin layer 23 can be increased.

  Further, the effects after molding of the resin layer 23 (resin bonded optical element 21) include the following. By increasing the accuracy of the resin thickness (outer diameter), it becomes easy to manufacture other members (for example, holding members). In addition, since the accuracy of the resin thickness (outer diameter) is increased, the shrinkage force of the resin layer 23 becomes substantially uniform regardless of the location. Therefore, it is possible to prevent the optical element base material 22 from being cracked as compared with the first embodiment.

  In the resin-bonded optical element 21 according to this embodiment, the mirror surface 22a is formed on the entire side surface 22c. For this reason, the allowable range of the arrival position of the end portion 23a of the resin layer 23 becomes wider. Therefore, the molding of the resin layer 23 becomes easier.

Moreover, the crack of the optical element base material 22 can be further prevented by setting the surface roughness Ra of the mirror surface 22a of the optical element base material 22 to 1 μm or less, more preferably 0.5 μm or less.
Further, when the resin layer 23 is molded, it is only necessary to supply (drop) an appropriate amount of resin and press the resin layer 23 with a mold so as to overflow the upper surface. Therefore, a complicated molding process is not required. Further, since it is not necessary to provide a resin reservoir on the side surface 22c of the optical element substrate 22, the structure of the mold and the structure of the resin bonded optical element 21 are simplified.

In addition, like the said 1st Embodiment, you may make it the optical element base material 22 have the mirror surface 22a in a part of side surface 22c.
FIG. 4 is a cross-sectional view showing a resin-bonded optical element according to the third embodiment of the present invention.

The resin-bonded optical element 31 shown in the figure is different from the second embodiment only in that the chamfered portion is a flat chamfered portion 32f, and thus detailed description thereof is omitted.
In the resin-bonded optical element 31 according to the present embodiment, a planar chamfered portion 32f is formed at a corner between the planar portion 32b and the side surface 32c. The planar chamfered portion 32f produces the same functions and functions as the curved chamfered portion 22e. Therefore, the resin-bonded optical element 31 according to this embodiment also has the same effect as the resin-bonded optical element 21 according to the second embodiment.

Also in the present embodiment, as in the first embodiment, the optical element substrate 32 may have a mirror surface 32a on a part of the side surface 32c.
FIG. 5 is a cross-sectional view showing a resin-bonded optical element according to a fourth embodiment of the present invention and an optical unit including the same.

  In the figure, a resin bonded optical element 41 has an optical element substrate 42 and a resin layer 43. The resin layer 43 covers the upper surface of the optical element base material 42, and the end 43 a reaches a part of the side surface 42 c of the optical element base material 42. A lens frame 44 is fixed to the outer peripheral portion of the resin layer 43. The lens frame 44 can arrange one or two or more optical elements in the frame. As described above, the resin bonded optical element 41 and the lens frame 44 constitute an optical unit.

  Also in this embodiment, the optical element substrate 42 has a mirror surface 42a on the side surface 42c. And the edge part 43a of the resin layer 43 is located in this mirror surface 42a. The lens frame 44 is fixed to the optical element base material 42 by, for example, a resin layer 43.

  Thus, in the resin-bonded optical element 41 according to this embodiment, the end 43a of the resin layer 43 is positioned on the mirror surface 42a of the optical element substrate side surface 42c. Here, the mirror surface 42a is substantially free from scratches such as a rough surface. For this reason, even if a contraction force of the resin layer 43 is applied to the side surface 42c due to a temperature change (for example, in a low temperature state), the side surface 42c is hardly cracked. Therefore, according to the resin-bonded optical element 41 according to the present embodiment, it is possible to effectively prevent the optical element base material 42 from being cracked.

  Further, the lens frame 44 and the optical element substrate 42 can be fixed via the resin layer 43. Thereby, the resin-bonded optical element 41 can be arranged on the lens frame 44 simultaneously with the formation of the resin layer 43. Therefore, the manufacturing time of the resin bonded optical element 41 can be shortened.

Also in the present embodiment, as in the first embodiment, the optical element base material 42 may have a mirror surface 42a on a part of the side surface 42c.
FIG. 6 is a sectional view showing a resin-bonded optical element according to the fifth embodiment of the present invention.

  The figure shows a cross section of the optical element substrate 52. This cross section is a cross section perpendicular to the optical axis 52g. Here, the resin-bonded optical element 51 has an optical element substrate 52 and a resin layer 53. When viewed in a cross section perpendicular to the optical axis 52g, at least a part of the outer peripheral portion 53b of the resin layer 53 is on a circle centered on the optical axis 52g. Here, in FIG. 6A, the entire outer periphery is on a circle centered on the optical axis 52g. In FIG. 6B, a part of the outer periphery is on a circle centered on the optical axis 52g.

Further, when viewed in a cross section perpendicular to the optical axis 52g, the outer peripheral portion 52h of the optical element substrate 52 is circular, and the circularity of the circle is 0.1 mm or less.
Also in this embodiment, the optical element substrate 52 has a mirror surface on the side surface, and the end of the resin layer 53 is positioned on the mirror surface.

  Thus, in the resin-bonded optical element 51 according to this embodiment, the end portion of the resin layer 53 is located on the mirror surface of the optical element substrate side surface. Here, the mirror surface is substantially free from scratches such as a rough surface. Therefore, even if the shrinkage force of the resin layer 53 is applied to the side surface due to the temperature change (for example, when the temperature is low), the side surface is not easily cracked, and the optical element substrate 52 is effectively prevented from cracking. can do.

  In the resin-bonded optical element 51 according to this embodiment, at least a part of the outer peripheral portion 53b of the resin layer 53 is centered on the optical axis 52g in a cross section perpendicular to the optical axis 52g of the optical element substrate 52. It is on a circle. Specifically, as shown in FIG. 6A, a part of the outer peripheral portion 53b is linear. Therefore, the outer shape is a rotationally asymmetric shape. Further, at least three portions distributed in a range of at least 180 ° are concentric. In such a configuration, for example, the resin-bonded optical element 51 is arranged on the lens frame 44 according to the fourth embodiment (FIG. 5). Here, at least a part of the outer peripheral portion 53b of the resin layer 53 is on a circle centered on the optical axis 52g. Therefore, using this portion, positioning with respect to the lens frame 44 can be facilitated.

  Furthermore, in the resin-bonded optical element 51 according to the present embodiment, the outer peripheral portion 52h of the optical element substrate 52 is circular in a cross section perpendicular to the optical axis 52g, and the roundness of the circle is 0.1 mm or less. It is said. By doing in this way, the outer peripheral part 53b of the resin layer 53 becomes easy to be located on the circle centering on the optical axis 52g. At the same time, the resin layer 53 easily reaches the entire circumference of the optical element substrate 52 uniformly. Therefore, variation due to the contraction position of the resin layer 53 is reduced. As a result, it is possible to effectively prevent the optical element substrate 52 from cracking.

FIG. 7 is a sectional view showing a resin-bonded optical element according to the sixth embodiment of the present invention.
In the figure, a resin-bonded optical element 61 has an optical element substrate 62 and a resin layer 63. The resin layer 63 covers the upper surface of the optical element substrate 62, and the end 63a reaches the side surface 62c. In FIG. 7A, a mirror surface 62a is formed on a part of the side surface 62, and the end 63a of the resin layer 63 is positioned on the mirror surface 62a. On the other hand, in FIG. 7B, a mirror surface 62a is formed on the entire side surface 62c, and the end 63a of the resin layer 63 is located within the mirror surface 62a.

Here, for example, a light shielding paint 62 i is applied to the side surface 62 c of the optical element base material 62. In FIG. 7A and FIG. 7B, the light shielding paint 62i is applied to the mirror surface 62a. The light-shielding paint 62i serves to prevent light from entering the resin-bonded optical element 61 from the outside, and light traveling in the resin-bonded optical element 61 is scattered and reflected by the side surface 62c. Play a role in preventing. In addition, when the light shielding paint 62i is applied to the mirror surface 62a,
The application surface is also a mirror surface. Therefore, the end 6 of the resin layer 63 is applied to the application surface of the light shielding paint 62i.
Even if 3a is located, no problem occurs.

  As described above, in the resin-bonded optical element 61 according to the present embodiment, the end 63a of the resin layer 63 is positioned on the mirror surface 62a of the optical element substrate side face 62c. Therefore, even if the contraction force of the resin layer 63 is applied to the side surface 62c due to the temperature change (for example, in a low temperature state), the side surface 62c is hardly cracked. Therefore, according to the resin-bonded optical element 61 according to the present embodiment, ghost generation can be suppressed by the light-shielding paint 62i even if the optical element base 62 has the mirror surface 62a.

In the present embodiment, the light shielding paint 62i is used to shield the mirror surface 62a. However, as long as the mirror surface 62a is shielded from light, they can be used as a substitute for the shading paint.

8 and 9 are explanatory views illustrating a method for manufacturing a resin-bonded optical element according to the seventh embodiment of the present invention.
First, as shown in FIG. 8, an optical element substrate 72 is prepared. The optical element substrate 72 has a mirror surface 72a on the side surface 72c. Then, the resin 75 is supplied onto the upper surface of the optical element substrate 72, here the concave optical surface 72b. Here, the surface roughness Ra of the mirror surface 72a is 5 μm or less. The surface roughness Ra of the mirror surface 72a is preferably 1 μm or less, and more preferably 0.5 μm or less. The mold 76 for forming the resin layer 73 has a convex molding surface 76 a corresponding to the concave optical surface 72 b of the optical element substrate 72.

  Next, as shown in FIG. 9, the mold 76 is moved closer to the resin 75. Then, the resin 75 is pressed by the mold 76 until the resin 75 has a predetermined thickness. At this time, the resin 75 overflows from the concave optical surface 72b. The overflowing resin 75 travels along the side surface 72c. Then, the end portion reaches the mirror surface 72 a of the optical element substrate 72. Here, the amount of resin to be supplied is an appropriate amount in advance. Therefore, the end is located in the mirror surface 72a. Then, the resin 75 is cured by resin curing means (not shown) (for example, energy rays or heat). Thereby, the edge part 73a of the resin layer 73 is located on the mirror surface 72a. Subsequently, the mold 76 is peeled from the resin layer 73 to manufacture a resin bonded optical element.

  In addition, although the case where the optical element base material 72 has the concave optical surface 72b was demonstrated as an example, the optical element base material 72 may naturally have a convex optical surface. In that case, the molding surface 76a of the mold 76 may be a concave mold instead of a convex mold, and the resin 75 may be supplied to the concave molding surface of the mold. And what is necessary is just to position the optical element base material 72 above a concave mold surface, and to make both relatively approach.

  The resin-bonded optical element manufacturing method according to the present embodiment is characterized in that an optical element substrate 72 having a mirror surface 72a on a side surface 72c is prepared, and a resin 75 is supplied onto the optical element substrate 72. Since the resin layer 73 in which the end portion 73a contacts the mirror surface 72a is formed by pressing 75, other configurations such as curing of the mold 76 and the resin layer 73 are not essential.

  As described above, in the method for manufacturing the resin-bonded optical element according to the present embodiment, the optical element base material 72 having the mirror surface 72a on the side surface 72c is prepared, and the resin 75 is supplied onto the optical element base material 72. 75 is pressed. The end of the resin 75 reaches the position of the mirror surface 72a. That is, the resin layer 73 with which the end 73a of the resin layer 73 abuts is formed on the mirror surface 72a. Thereby, the edge part 73a of the resin layer 73 will be located in the mirror surface 72a of the optical element base-material side surface 72c. Here, the mirror surface 72a is substantially free from scratches such as a rough surface. Therefore, even if the shrinkage force of the resin layer 73 is applied to the side surface 72c due to the temperature change (for example, when the temperature is low), the side surface 72c is not easily cracked. Therefore, according to the method for manufacturing the resin-bonded optical element according to the present embodiment, it is possible to effectively prevent the optical element substrate 72 from being cracked.

  In the present embodiment and the first to sixth embodiments, the method for manufacturing the optical element base material 72 having the mirror surface 72a on the side surface 72c is not described. However, for example, the optical element base material is obtained by the method shown in FIG. Can be manufactured. In this manufacture, for example, an upper mold 86a, a lower mold 86b, and an outer diameter regulating member 87 are used. The upper mold 86a and the lower mold 86b mold the optical surfaces (upper surface and lower surface) of the optical element substrate 82. On the other hand, the outer diameter regulating member 87 forms the side surface of the optical element substrate 82. Here, the outer diameter regulating member 87 has a cylindrical shape, and its inner peripheral surface is mirror-finished. Therefore, the mirror surface of the outer diameter regulating member 87 is transferred to the side surface of the optical element substrate 82 during molding. Thereby, the optical element base material 82 which has a mirror surface on the side surface can be manufactured.

  In addition, as another manufacturing method, there is a method of performing mirror finishing on the side surface of the optical element substrate by polishing or the like. Therefore, the manufacturing method of the optical element substrate may not be as shown in FIG.

11 and 12 are explanatory views for explaining a resin-bonded optical element according to an eighth embodiment of the present invention and a method for manufacturing an optical unit including the same.
First, as shown in FIG. 11, an optical element substrate 92 having a mirror surface 92a on a side surface 92c and a lens frame 94 are prepared. The lens frame 94 can arrange one or two or more optical elements in the frame. In FIG. 11, a jig 95 is disposed on one side (planar side) of the optical element base 92, and the optical element base 92 is placed on the jig 95. A known technique may be used for positioning the optical element substrate 92 and the lens frame 94. The optical element base 92 and the lens frame 94 are held by a holding unit (not shown). Here, the surface roughness Ra of the mirror surface 92a is 5 μm or less. The surface roughness Ra of the mirror surface 92a is preferably 1 μm or less, and more preferably 0.5 μm or less.

  And as shown in FIG. 12, resin is supplied from the other (convex surface side) of the optical element base material 92. The resin spreads along the surface of the optical element substrate 92, and its end reaches the side surface 92c. As a result, a resin layer 93 is formed on the mirror surface 92a. The end portion 93a of the resin layer 93 is in contact with the mirror surface 92a. In this way, the optical element base 92 and the lens frame 93 are fixed simultaneously with the formation of the resin layer 93. In this case, for example, a resin layer 93 may be formed by approaching a mold that can be inserted into the lens frame 94 from the resin side and pressing the resin with the mold. By doing in this way, the optical unit provided with the optical element base material 92, the resin layer 93, and the lens frame 94 is obtained.

  As described above, in the method for manufacturing the resin-bonded optical element and the optical unit according to the present embodiment, the resin layer 93 is formed and the optical element base 92 and the lens frame 94 are fixed simultaneously. At that time, the end portion 93 a of the resin layer 93 is positioned on the mirror surface 92 a of the optical element substrate 92. Therefore, even if the contraction force of the resin layer 93 is applied to the side surface 92c due to the temperature change (for example, when the temperature is low), the side surface 92c is not easily cracked. Therefore, according to the method for manufacturing the resin-bonded optical element and the optical unit according to the present embodiment, it is possible to effectively prevent the optical element substrate 92 from being cracked. Furthermore, according to the method for manufacturing the resin-bonded optical element and the optical unit according to this embodiment, the optical element base material 92 can be simultaneously arranged on the lens frame 94, and the manufacturing time can be shortened. .

It is sectional drawing which shows the optical element base material which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the resin bonded optical element which concerns on the modification of 1st Embodiment of this invention. It is sectional drawing which shows the resin bonding type | mold optical element which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the resin bonding type | mold optical element which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the resin bonded optical element which concerns on 4th Embodiment of this invention, and an optical unit provided with the same. It is sectional drawing which shows the resin bonding type | mold optical element which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the resin bonding type | mold optical element which concerns on 6th Embodiment of this invention. It is explanatory drawing (the 1) explaining the manufacturing method of the resin bonded optical element which concerns on 7th Embodiment of this invention. It is explanatory drawing (the 2) explaining the manufacturing method of the resin bonded optical element which concerns on 7th Embodiment of this invention. It is explanatory drawing explaining the example of the manufacturing method of an optical element base material. It is explanatory drawing (the 1) explaining the manufacturing method of the resin bonded optical element which concerns on 8th Embodiment of this invention, and an optical unit provided with the same. It is explanatory drawing (the 2) explaining the manufacturing method of the resin bonded optical element which concerns on 8th Embodiment of this invention, and an optical unit provided with the same.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin bonding type optical element 2 Optical element base material 2a Mirror surface 2b Optical surface 2c Side surface 2d Plane 3 Resin layer 3a Resin layer edge part 22 Optical element base material 22d Plane part 22e Chamfering part 32 Optical element base material 32f Chamfering part 44 Mirror frame 52 Optical element base material 52g Optical axis 52h Outer peripheral part 53 Resin layer 53b Outer peripheral part 62 Optical element base material 62i Light-shielding paint 75 Resin 76 Mold 76a Molding surface 87 Outer diameter regulating member 94 Lens frame 95 Jig

Claims (12)

In a resin-bonded optical element having an optical element substrate and a resin layer bonded to the optical element substrate,
The optical element substrate has a mirror surface on at least a part of its side surface,
An end of the resin layer is located on the mirror surface.   The optical element according to claim 1, wherein the optical element substrate has the mirror surface on the entire side surface.   The optical element according to claim 1, wherein the mirror surface has a surface roughness (Ra) of 5 μm or less.   4. The optical element according to claim 1, wherein a chamfered portion is formed between the optical surface and the side surface of the optical element substrate. 5.   2. The outer shape of the resin layer in a cross section perpendicular to the optical axis of the optical element substrate is rotationally asymmetric, and at least three portions distributed in a range of at least 180 ° are concentric. The optical element according to claim 1.   The outer periphery of the optical element base material in a cross section perpendicular to the optical axis of the optical element base material is circular, and the roundness of the circle is 0.1 mm or less. 6. The optical element according to any one of items 5.   The optical element according to claim 1, further comprising a light-shielding portion on the mirror surface.   An optical unit comprising: the optical element according to claim 1; and a lens frame that holds the optical element. In a method for producing a resin-bonded optical element in which a resin layer is bonded to at least a part of an optical element substrate,
Prepare the optical element substrate having a mirror surface on the side,
Supplying resin onto the optical element substrate;
A method of manufacturing an optical element, comprising pressing the resin to form the resin layer whose end is in contact with the mirror surface. Prepare an optical element substrate having a mirror surface on the side surface and a lens frame,
The method of manufacturing an optical element according to claim 9, wherein the optical element substrate and the lens frame are fixed by forming the resin layer whose end abuts on the mirror surface. In the method for producing a resin-bonded optical element,
Supplying resin to the optical surface;
Pressing the resin and spreading the resin on the optical surface;
Curing the resin,
The step of pressing the resin includes a step of overflowing the resin from the optical surface toward a side surface following the optical surface,
The method of manufacturing an optical element, wherein the curing step includes curing when the overflowing resin reaches the mirror surface of the side surface. Comprising the steps of claim 11;
Before the step of supplying the resin, a holding surface is disposed outside the optical surface,
The method of manufacturing an optical unit, wherein the step of spreading the resin includes pressing the resin so that the resin is filled between the side surface and the holding surface.

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