JP2009244787A - Lens assembly, bonding method, and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens assembly capable of securing sufficient vibration-proof performance and shock-proof performance and excelling in assemblability, to provide a method of bonding the lens assembly, and to provide an imaging apparatus with the lens assembly. <P>SOLUTION: While taking lenses 14, 13, 12 and 11 are sequentially housed in a lens barrel 15 and a female screw of a lens holder 17 is screwed on a male screw of the lens barrel 15, an adhesive 18 is injected from an attaching hole 17c1 of the lens holder 17. Further, the adhesive 18 is made to permeate in a screwed spot of the male screw of the lens barrel 15 and the female screw of the lens holder 17 via space α formed between the lens barrel 15 and the lens holder 17 and corresponding to a D-cut part 15b1 of the lens barrel 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens assembly including a lens barrel that accommodates a lens and a lens holder attached to the lens barrel, a method for bonding the lens barrel and the lens holder in the lens assembly, and an imaging device including the lens assembly. About.

  Recently, cameras have been deployed in automobiles. A camera installed in a car is used for monitoring or used for driving assistance. The latter uses the fact that navigation systems are widespread and a display screen is provided in the driver's seat, and is intended to display an image taken by a camera on the display screen.

  Many of these in-vehicle cameras are required to have vibration resistance and shock resistance, and in order to meet these demands, to achieve sufficient vibration resistance and shock resistance without increasing the size of the camera. In addition, a lens assembly having a small size and excellent vibration resistance and shock resistance is provided.

  FIG. 7 is a view showing a cross section of the conventional lens assembly including the optical axis of the photographing lens.

  In FIG. 7, in order from the side on which the subject light A is incident, a first group of photographing lenses 101, a second group of photographing lenses 102, and a third group of photographing lenses 103 constituting the lens assembly 100, A fourth group of photographic lenses 104 is shown. Further, in FIG. 7, the lens barrel 105 that accommodates the photographing lenses 101, 102, 103, and 104 is disposed between the groove provided on the periphery of the photographing lens 101 and the inner wall surface of the lens barrel 105. An O-ring 106 and a lens holder 107 fixed to the lens barrel 105 are shown.

  Specifically, a male screw is formed on the outer peripheral surface of the lens barrel 105, and a female screw is formed on the inner wall surface of the lens holder 107, and a female screw of the lens holder 107 is attached to the male screw of the lens barrel 105. The lens holder 107 is attached to the lens barrel 105 by screwing. In addition, the lens holder 107 is provided with a communication hole 107a, and the adhesive 108 is injected from the communication hole 107a into a place where the male screw and the female screw are screwed together. The holder 107 is fixed. The lens holder 107 is attached with a CCD substrate described below.

  FIG. 8 is a view showing a state in which the CCD substrate is attached to the lens holder constituting the lens assembly shown in FIG.

  FIG. 8 shows the lens assembly 100 shown in FIG. Further, FIG. 8 shows a semiconductor package 109 on which a CCD image pickup device is mounted, and a CCD substrate 110 on which the semiconductor package 109 is mounted. In order to attach the CCD substrate 110 to the lens holder 107, the lateral direction X of the CCD substrate 110 (perpendicular to the paper surface), the longitudinal direction Y (up and down direction relative to the paper surface), the optical axis direction Z, and the optical axis. The tilt angle θ (tilt angle) in the elevation angle direction is adjusted, and then the adhesive 111 is applied to the contact portion between the lens holder 107 and the CCD substrate 110 to fix the CCD substrate 110 to the lens holder 107.

  As described above, in the lens assembly 100 described above, the adhesive 108 is applied to the portion where the male screw of the lens barrel 105 and the female screw of the lens holder 107 are screwed together, and the lens holder 107 is fixed to the lens barrel 105. ing. Further, an adhesive 111 is applied to a contact portion between the lens holder 107 and the CCD substrate 110, and the CCD substrate 110 is fixed to the lens holder 107. Therefore, a lens assembly that is small in size and secures vibration resistance and impact resistance is realized.

  Japanese Patent Application Laid-Open No. 2004-133620 discloses a lens assembly that secures waterproofness between a photographing lens and a lens barrel by caulking a protrusion at the tip of the lens barrel to the front side of the photographing lens by thermal welding. A technique has been proposed in which a camera case is screwed to a camera case via a rubber packing.

Furthermore, Patent Document 2 proposes a technique for fixing a lens unit, which is a lens barrel, to a lens holder using a nut body that is externally mounted on the lens holder.
JP 2002-90603 A JP 2005-352386 A

  As described above, in the conventional lens assembly shown in FIGS. 7 and 8, when fixing the lens holder to the lens barrel, the male screw formed on the outer peripheral surface of the lens barrel and the inner wall surface of the lens holder are formed. After the female screw is screwed, an adhesive is injected into the screwed portion from a communication hole provided in the lens holder. Here, since the screwed portion is a portion where the male screw and the female screw are in close contact with each other, it is difficult to sufficiently apply the adhesive to the screwed portion. Therefore, the adhesive strength is weak and the vibration resistance is sufficient. It is difficult to ensure performance and impact resistance. Therefore, before the male screw formed on the outer peripheral surface of the lens barrel and the female screw formed on the inner wall surface of the lens holder are screwed together, an adhesive is applied to the male screw and the female screw. It is conceivable to screw the screw and the female screw together. By doing so, it is possible to sufficiently spread the adhesive to the screwed portions, and therefore it is possible to sufficiently ensure the vibration resistance performance and the impact resistance performance. However, since the assembly performance is checked after the adhesive is applied to the male screw and the female screw, for example, when the positional relationship between the lens barrel and the lens holder is out of the specified range, the lens barrel and the lens Since the holder is already fixed with an adhesive, it is difficult to adjust the positional relationship between the lens barrel and the lens holder within a specified range. Therefore, a situation occurs in which the assembled lens assembly must be discarded.

  In addition, the lens unit is mounted using a technique proposed in Patent Document 1 for screwing a lens barrel to a camera case via a rubber packing, and a nut body proposed in Patent Document 2 that is externally mounted on a lens holder. The technique of fixing to the lens holder has problems that the assembling work is complicated and the lens assembly is enlarged.

  SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a lens assembly that can ensure sufficient vibration resistance and impact resistance and is excellent in assemblability, a bonding method in the lens assembly, and an imaging device including the lens assembly. The purpose is to provide.

The lens assembly of the present invention that achieves the above object is
A lens barrel that houses a lens and has a first screw formed on the outer peripheral surface, and a lens holder that has an opening and a second screw that engages with the first screw on the inner wall surface of the opening. Prepared,
The lens barrel has a D-cut portion having a shape in which a part of the first screw is cut flat in the optical axis direction of the lens,
The lens holder has an adhesion hole for looking into the D-cut portion in the optical axis direction of the lens in a state where the first screw and the second screw are screwed together.

  The lens assembly of the present invention has a D-cut portion of the lens barrel between the lens barrel and the lens holder in a state where the first screw of the lens barrel and the second screw of the lens holder are completely screwed together. A corresponding space is formed. Here, when the adhesive is injected from the bonding hole of the lens holder, the injected adhesive is sufficiently passed through the space to the place where the first screw and the second screw are screwed together. Can penetrate. Accordingly, it is possible to provide a lens assembly in which the lens holder can be fixed to the lens barrel with sufficient strength, and vibration resistance performance and impact resistance performance are sufficiently ensured.

  In addition, since the adhesive can be injected from the adhesive hole after the confirmation of the assembly performance, the first screw and the second screw are screwed together after the adhesive is applied to the first screw and the second screw. Compared to the case where it is necessary to avoid the situation where it is determined that adjustment is required in checking the assembly performance and the lens assembly in which the lens barrel and the lens holder are already fixed with the adhesive must be discarded. Therefore, the waste rate of the lens assembly can be reduced.

  Further, the lens unit is mounted on the lens unit using a technique proposed in Patent Document 1 for screwing the lens barrel to the camera case via a rubber packing, or a nut body that is proposed in Patent Document 2 and is mounted on the lens holder. Compared with the technique of fixing to the holder, the assembling operation is simple and does not increase in size, and thus a lens assembly that is small and excellent in assemblability can be provided.

  Here, it is preferable that a vent hole penetrating in the optical axis direction of the lens including the adhesion hole and the D-cut portion is provided between the outer peripheral surface of the lens barrel and the inner wall surface of the lens holder.

  If it does in this way, an adhesive agent can be inject | poured over the whole region corresponding to D cut part formed between the lens-barrel and the lens holder. For this reason, the adhesive can be further sufficiently permeated into the screwed portion of the first screw of the lens barrel and the second screw of the lens holder. Accordingly, it is possible to provide a lens assembly in which the lens holder can be fixed to the lens barrel with a sufficient strength, and the vibration resistance performance and the shock resistance performance are further sufficiently ensured.

Further, the adhesion method in the lens assembly of the present invention that achieves the above-described object is as follows.
A lens barrel that houses a lens and has a first screw formed on the outer peripheral surface, and a lens holder that has an opening and a second screw that engages with the first screw on the inner wall surface of the opening. ,
The lens barrel has a D-cut portion having a shape in which a part of the first screw is cut flat in the optical axis direction of the lens,
The lens holder has an adhesive hole for looking through the D-cut portion in the optical axis direction of the lens in a state where the first screw and the second screw are screwed together,
The lens barrel and the lens assembly in the lens assembly having a vent hole penetrating in the optical axis direction of the lens, including the bonding hole and the D cut portion, between the outer peripheral surface of the lens barrel and the inner wall surface of the lens holder. A method of bonding with a lens holder,
An adhesive is injected from the bonding hole while sucking out air passing through the vent hole from the side opposite to the bonding hole.

  The bonding method in the lens assembly of the present invention is a method of injecting an adhesive from the bonding hole while sucking out air passing through the vent hole from the side opposite to the bonding hole of the lens holder. For this reason, the injected adhesive is sucked in the opposite direction. For this reason, the adhesive can be injected over the entire space corresponding to the D-cut portion formed between the lens barrel and the lens holder. By doing so, the adhesive can be further sufficiently permeated into the screwed portion of the first screw of the lens barrel and the second screw of the lens holder. Therefore, it is possible to fix the lens holder to the lens barrel with sufficient strength, and it is possible to manufacture a lens assembly in which vibration resistance performance and impact resistance performance are sufficiently ensured.

  Furthermore, an image pickup apparatus of the present invention that achieves the above object includes the lens assembly and an image pickup apparatus.

  Since the imaging apparatus of the present invention includes the lens assembly, it is possible to provide a lens imaging apparatus in which vibration resistance performance and impact resistance performance are sufficiently ensured.

  According to the present invention, it is possible to provide a lens assembly that is capable of ensuring sufficient vibration resistance and impact resistance and is excellent in assemblability, an adhesion method in the lens assembly, and an imaging device including the lens assembly. Can do.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a view showing a cross section including an optical axis of a photographing lens in the lens assembly according to the first embodiment of the present invention. 2 is a perspective view of a lens barrel provided in the lens assembly shown in FIG. 1, and FIG. 3 is a view of the lens assembly shown in FIG.

  FIG. 1A shows a cross-sectional view of the entire lens assembly 10 according to the first embodiment of the present invention, including the optical axis of the photographic lens. Further, FIG. 1B shows an enlarged cross-sectional view of the lens assembly 10 shown in FIG. 1A and the D-cut portion of the lens barrel described below and the bonding hole of the lens holder. .

  In the lens assembly 10 of the first embodiment shown in FIG. 1A, in order from the side on which the subject light A is incident, a first group of photographing lenses 11, a second group of photographing lenses 12, and a third group. The fourth taking lens 13 and a fourth group taking lens 14 are provided. In addition, the lens assembly 10 is arranged between a lens barrel 15 that accommodates the photographing lenses 11, 12, 13, and 14, and a groove provided on the periphery of the photographing lens 11 and an inner wall surface of the lens barrel 15. An O-ring 16 and a lens holder 17 fixed to the lens barrel 15 are provided. A CCD substrate (not shown) is attached to the lens holder 17.

  Specifically, as shown in FIG. 2, a male screw 15 a (corresponding to an example of the first screw according to the present invention) is formed on the outer peripheral surface of the lens barrel 15. Further, the lens barrel 15 has D-cut portions 15b1 and 15b2 having a shape in which a part of the male screw 15a is cut flat in the optical axis direction of the photographing lenses 11, 12, 13, and 14.

  Further, as shown in FIG. 3, the lens holder 17 has an opening 17a. On the inner wall surface of the opening 17a, a female screw 17b (corresponding to an example of the second screw in the present invention) to be screwed into the male screw 15a of the lens barrel 15 is formed. Further, the lens holder 17 has an adhesive hole 17c1, which looks into the D-cut portions 15b1, 15b2 in the optical axis direction of the photographing lenses 11, 12, 13, 14 in a state where the male screw 15a and the female screw 17b are screwed together. 17c2. Adhesive 18 (see FIG. 1B) is injected into the bonding holes 17c1 and 17c2, and the screwed portions of the male screw 15a and the female screw 17b are bonded to fix the lens holder 17 to the lens barrel 15. .

  When assembling the lens assembly 10, first, the fourth group of photographing lenses 14 is accommodated in the lens barrel 15. Next, the third group photographing lens 13 and the second group photographing lens 12 are sequentially accommodated in the lens barrel 15. Further, an O-ring 16 is fitted in a groove provided at the periphery of the first group of photographing lenses 11, and the photographing lens 11 is accommodated in the lens barrel 15. After the first group of photographing lenses 11 is housed in the lens barrel 15, the front end of the lens barrel 15 is bent by heat caulking to hold the first group of photographing lenses 11.

  Next, the female screw 17 b of the lens holder 17 is screwed into the male screw 15 a of the lens barrel 15. Furthermore, assembling performance is confirmed as necessary. Here, for example, when the positional relationship between the lens barrel 15 and the lens holder 17 is out of the specified range, the positional relationship between the lens barrel 15 and the lens holder 17 is adjusted within the specified range. Next, the adhesive 18 is injected from the bonding holes 17c1 and 17c2 of the lens holder 17.

  As described above, the lens barrel 15 has the D-cut portions 15b1 and 15b2 having a shape in which a part of the male screw 15a is cut flat in the optical axis direction. For this reason, in the state where the screwing of the male screw 15a of the lens barrel 15 and the female screw 17b of the lens holder 17 is completed, a space α corresponding to the D-cut portions 15b1 and 15b2 is provided between the lens barrel 15 and the lens holder 17. (See FIG. 1B) is formed. Further, as described above, the lens holder 17 has the bonding hole 17c1 that looks into the D-cut portions b1 and b21 in the optical axis direction in a state where the male screw 15a of the lens barrel 15 and the female screw 17b of the lens holder 17 are screwed together. , 17c2. Here, when the adhesive 18 is injected from the adhesive holes 17c1 and 17c2, the injected adhesive 18 is screwed between the male screw 15a of the lens barrel 15 and the female screw 17b of the lens holder 17 via the space α. Fully penetrates the jointed area. Accordingly, it is possible to provide the lens assembly 10 in which the lens holder 17 can be fixed to the lens barrel 15 with sufficient strength, and vibration resistance performance and impact resistance performance are sufficiently ensured.

  In addition, since the adhesive 18 can be injected from the bonding holes 17c1 and 17c2 after the assembly performance is confirmed, the male screw and the female screw are screwed together after the adhesive is applied to the male screw and the female screw. In comparison, it is possible to avoid a situation where it is determined that adjustment is necessary in the confirmation of assembly performance and the lens assembly in which the lens barrel and the lens holder are already fixed with an adhesive must be discarded, Accordingly, the discard rate of the lens assembly 10 is reduced.

  Further, the lens unit is mounted on the lens unit using a technique proposed in Patent Document 1 for screwing the lens barrel to the camera case via a rubber packing, or a nut body that is proposed in Patent Document 2 and is mounted on the lens holder. Compared with the technique of fixing to the holder, the assembling operation is simple and does not increase in size, and therefore, the lens assembly 10 that is small and excellent in assemblability can be provided.

  FIG. 4 is a view showing a cross section including the optical axis of the photographing lens of the lens assembly according to the second embodiment of the present invention.

  FIG. 4A is a cross-sectional view of the entire lens assembly 20 according to the second embodiment of the present invention including the optical axis of the photographing lens. FIG. 4B is an enlarged cross-sectional view of the D-cut portion of the lens barrel and the bonding hole of the lens holder of the lens assembly 20 shown in FIG. The same components as those of the lens assembly 10 shown in FIG. 1 are denoted by the same reference numerals, and different points will be described.

  In the lens assembly 20 shown in FIG. 4, the lens holder 17 is replaced with a lens holder 27 described below, as compared with the lens assembly 10 shown in FIG. 1. In addition, an embodiment of the bonding method in the lens assembly of the present invention is applied to the lens assembly 20 shown in FIG.

  The lens assembly 20 shown in FIG. 4 includes an optical axis including adhesive holes 17c1 and 17c2 and D-cut portions 15b1 and 15b2 (see FIG. 2) between the outer peripheral surface of the lens barrel 15 and the inner wall surface of the lens holder 27. There are vent holes 27a and 27b penetrating in the direction. These vent holes 27 a and 27 b are formed by machining (shaving) the inner wall surface of the lens holder 27.

  When assembling the lens assembly 20, the fourth group photographing lens 14, the third group photographing lens 13, and the second group photographing lens 12 are sequentially formed in the same manner as when the lens assembly 10 shown in FIG. 1 is assembled. The O-ring 16 is fitted in a groove provided on the periphery of the first group of the taking lens 11 to house the taking lens 11 in the barrel 15. Further, the female screw of the lens holder 27 is screwed into the male screw of the lens barrel 15, and the assembling performance is confirmed as necessary.

  Next, the adhesive 18 is injected from the bonding holes 17c1 and 17c2 of the lens holder 27. Here, as shown in FIG. 4A, from the side opposite to the bonding holes 17c1 and 17c2 (objective side), the air passing through the vent holes 27a and 27b is sucked out in the directions of the arrows P1 and P2, and then the bonding hole 17c1. , 17c2 to inject adhesive 18. Then, as shown in FIG. 4B, the injected adhesive 18 is sucked in the direction of the arrow P3. For this reason, the adhesive 18 can be poured over the entire space α corresponding to the D-cut portion 15b1 formed between the lens barrel 15 and the lens holder 27. By doing so, the adhesive 18 can be further sufficiently permeated into the screwed portion of the male screw of the lens barrel 15 and the female screw of the lens holder 17. Therefore, the lens holder 27 can be fixed to the lens barrel 15 with sufficient strength, and the lens assembly 20 with sufficient vibration resistance and shock resistance can be provided.

  FIG. 5 is a view of a lens assembly different from the lens assembly shown in FIG. 1 as viewed from the imaging side.

  In the lens assembly 10 shown in FIG. 1, as shown in FIG. 3, a part of the male screw 15 a included in the lens barrel 15 has D-cut portions 15 b 1 and 15 b 2 that are cut flat in the optical axis direction of the photographing lens. As described in the example, instead of the D cut portions 15b1 and 15b2 of the male screw 15a, as shown in FIG. 5, the female screw 17b of the lens holder 17 is cut out in the direction perpendicular to the optical axis, A cutout portion 17d is provided in 17b, and an adhesive 18 (see FIG. 1B) is injected into the cutout portion 17d, and the screwed portions of the male screw 15a and the female screw 17b are bonded to each other to attach the lens holder to the lens barrel 15. 17 may be fixed.

  6 is a view showing a cross section including the optical axis of the photographing lens of the camera unit including the lens assembly shown in FIG.

  A camera unit 30 shown in FIG. 6 is an embodiment of the image pickup apparatus of the present invention. The camera unit 30 includes a lens assembly 10 shown in FIG. 1, a semiconductor package 31 on which a CCD image pickup device is mounted, A CCD substrate 32 on which the semiconductor package 31 is mounted is provided. Further, an adhesive 33 is applied to a contact portion between the lens holder 17 and the CCD substrate 32, and the CCD substrate 32 is fixed to the lens holder 17. According to the camera unit 30, since the lens assembly 10 shown in FIG. 1 is provided, vibration resistance and impact resistance are sufficiently ensured.

  The lens assembly 20 of the second embodiment shown in FIG. 4 and the lens assembly shown in FIG. 5 in which the female screw 17b of the lens holder 17 is cut out in the direction perpendicular to the optical axis are also shown in FIG. Similar to the lens assembly 10, it can be applied as a camera unit.

It is a figure which shows the cross section containing the optical axis of a taking lens of the lens assembly of 1st Embodiment of this invention. FIG. 2 is a perspective view of a lens barrel provided in the lens assembly shown in FIG. 1. It is the figure which looked at the lens assembly shown in FIG. 1 from the image formation side. It is a figure which shows the cross section containing the optical axis of a taking lens of the lens assembly of 2nd Embodiment of this invention. It is the figure which looked at the lens assembly different from the lens assembly shown in FIG. 1 from the image formation side. It is a figure which shows the cross section containing the optical axis of a photographing lens of the camera unit provided with the lens assembly shown in FIG. It is a figure which shows the cross section containing the optical axis of a taking lens of the conventional lens assembly. It is the figure which showed a mode that a CCD board | substrate was attached to the lens holder which comprises the lens assembly shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,20 Lens assembly 11 1st group shooting lens 12 2nd group shooting lens 13 3rd group shooting lens 14 4th group shooting lens 15 Lens barrel 15a Male thread 15b1, 15b2 D cut part 16 O-ring 17 , 27 Lens holder 17a Opening 17b Female thread 17c1, 17c2 Adhesive hole 17d Notch 18 Adhesive 27a, 27b Vent hole 30 Camera unit 31 Semiconductor package 32 CCD substrate

Claims (4)

A lens barrel that contains a lens and has a first screw formed on the outer peripheral surface, and a lens holder that has an opening and a second screw that engages with the first screw on the inner wall surface of the opening. Prepared,
The lens barrel has a D-cut portion having a shape in which a part of the first screw is cut flat in the optical axis direction of the lens,
The lens assembly, wherein the lens holder has an adhesive hole for looking into the D-cut portion in the optical axis direction of the lens when the first screw and the second screw are screwed together. .   The vent hole penetrating in the optical axis direction of the lens including the adhesion hole and the D cut portion is provided between the outer peripheral surface of the lens barrel and the inner wall surface of the lens holder. Lens assembly. A lens barrel that houses a lens and has a first screw formed on the outer peripheral surface thereof, and a lens holder that has an opening and a second screw that is screwed to the first screw on the inner wall surface of the opening. ,
The lens barrel has a D-cut portion having a shape in which a part of the first screw is cut flat in the optical axis direction of the lens,
The lens holder has an adhesive hole for looking into the D-cut portion in the optical axis direction of the lens in a state in which the first screw and the second screw are screwed together,
In the lens assembly having a vent hole penetrating in the optical axis direction of the lens, including the bonding hole and the D-cut portion between the lens barrel outer peripheral surface and the lens holder inner wall surface, A method of bonding with a lens holder,
A bonding method, wherein an adhesive is injected from the bonding hole while sucking out air passing through the vent hole from a side opposite to the bonding hole.   An imaging apparatus comprising the lens assembly according to claim 1 and an imaging element.

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