JP2009282070A - Method for assembling lens assembly, method for disassembling lens assembly and pick-up device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for assembling a lens assembly capable of easily loading a lens arranged nearest to an object side and an O ring together in the hollow part of a lens frame, a method for disassembling a lens assembly capable of easily taking out the lens from the hollow part of the lens frame of the lens assembly that is once assembled without damaging it, and a pick-up device equipped with the lens assembly that is assembled by the method for assembling the same. <P>SOLUTION: While air is drawn in from an opening at the imaging side of the lens frame 10, the lens arranged nearest to the object side is loaded in such a state that the O ring 15 is installed. Contrarily, when the lens assembly is disassembled, the air is blown in from the opening at the imaging side of the lens frame 10, and the lens 14 arranged nearest to the object side is taken out. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an assembling method, a disassembling method, and an assembling method of a lens assembly including a plurality of lenses and a hollow portion, and a lens frame in which the plurality of lenses are inserted into the hollow portion. The present invention relates to an imaging device provided with the lens assembly.

  Recently, cameras have been deployed in automobiles. Many of such cameras use the fact that navigation systems are widespread and display screens are provided in the driver's seat, and display the state of a place where the driver is blind spot on the display screen.

In such a vehicle-mounted camera, a strict waterproof performance is required because the lens located closest to the object side is exposed on the surface of the vehicle body. For this reason, in the lens assembly mounted on the vehicle-mounted camera, an O-ring is inserted between the outer peripheral surface of the lens located closest to the object side and the inner peripheral surface of the lens frame to Many intrusions are prevented (
For example, see Patent Document 1).

By the way, a lens frame in which a hollow portion is formed may be used for a lens assembly in order to obtain higher waterproof performance and dustproof performance. When the lens frame having the hollow part is used, the lenses are inserted in the hollow part in order and finally the lens frame is sealed with the lens positioned closest to the object side. However, when a lens frame having this hollow portion is used, when the lens arranged closest to the object side is inserted into the lens frame together with the O-ring, the O-ring and the lens are inserted under a large pressure from within the lens frame. There is a drawback that it becomes difficult. In order to solve this, it is necessary to forcefully push the lens and the O-ring with a force exceeding the pressure from the inside of the lens frame by press fitting or the like. However, if the O-ring is forcibly pushed together with the lens by press fitting or the like, there arises a problem that the positional accuracy of the lens cannot be obtained and the optical performance is deteriorated. Further, when assembling is performed by press-fitting or the like, there is a problem that it is difficult to disassemble the lens assembly and take it out without damaging the lens or O-ring when an assembly failure occurs.
JP 2002-90603 A

  In view of the above circumstances, the present invention provides a method for assembling a lens assembly in which a lens arranged closest to the objective side together with an O-ring can be easily inserted into a hollow portion of a lens frame, and a lens assembly once assembled. It is an object of the present invention to provide a method for disassembling a lens assembly that can be easily taken out from a hollow portion of a lens frame without damaging the lens, and an imaging device including the lens assembly assembled by the assembling method.

A method for assembling a lens assembly of the present invention that achieves the above object comprises a plurality of lenses,
A lens frame having a hollow part in which the plurality of lenses are inserted with the optical axis aligned and having an objective side opening and an imaging side opening;
An O-ring sandwiched between the outer peripheral surface of the first lens disposed on the most object side of the plurality of lenses and the inner wall of the lens frame hollow portion;
A method of assembling a lens assembly, wherein the first lens has an O-ring arrangement portion formed on the imaging side portion of the outer peripheral surface of the first lens so as to be smaller in diameter than the objective side portion. ,
A first loading step of loading the remaining lens excluding the first lens of the plurality of lenses into the lens hollow portion;
An O-ring arrangement step of arranging an O-ring in the O-ring arrangement portion of the first lens;
A second loading step of loading the first lens in a state where an O-ring is disposed in the O-ring arrangement portion from the objective-side opening of the hollow portion while sucking air from the imaging-side opening. It is characterized by having.

  According to the lens assembly of the present invention, after the remaining lens other than the first lens arranged closest to the object side in the first loading step is loaded into the lens hollow portion, the second lens is assembled. In the loading step, the first lens in a state where the O-ring is arranged is inserted into the lens hollow portion with the assistance of air suction from the imaging side opening. For this reason, the air toward the objective side in the lens hollow portion is reduced by suction, the pressure is reduced, and the first lens is easily inserted.

  For this reason, it is possible to insert the lens without much effort to insert the lens, and it is possible to obtain the effect that the positional accuracy of the lens can be reliably obtained. This effect leads to the effect of improving optical performance.

The lens assembly disassembling method of the present invention that achieves the above object has a plurality of lenses, an objective side opening, and an image forming side opening, and the plurality of lenses are inserted with their optical axes aligned. A lens frame having a hollow portion; and an O-ring sandwiched between the outer peripheral surface of the first lens disposed on the most objective side of the plurality of lenses and the inner wall of the lens frame hollow portion. A method of disassembling the lens assembly,
The first lens is extracted from the objective side opening while blowing air from the image forming side opening.

  According to the method for disassembling the lens assembly of the present invention, the lens in the lens hollow portion is scratched by using the force of air flowing from the image-side opening toward the object side through a slight gap in the lens frame. It can be easily removed without attaching. For this reason, when an assembly failure of the lens assembly occurs, it is possible to disassemble the lens assembly, take out the lens, and reuse the lens.

  In addition, an image pickup apparatus of the present invention that achieves the above object includes a lens assembly assembled by the assembly method of the present invention and an image pickup element.

  According to the imaging apparatus of the present invention, by incorporating the lens assembly, an assembly failure rate of the lens assembly is reduced, and an imaging apparatus in a favorable assembled state can be obtained.

  As described above, a method for assembling a lens assembly that can easily insert the lens disposed closest to the object side together with the O-ring into the hollow portion of the lens frame, and the lens frame of the once assembled lens assembly The disassembly method of the lens assembly that can be easily taken out from the hollow portion without damaging the lens, and the imaging device including the lens assembly assembled by the assembling method are realized.

  Hereinafter, embodiments of the present invention will be described.

  FIG. 1 is a perspective view illustrating a configuration of a lens assembly 1 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating a cut surface of the lens assembly 1 of FIG.

  1 and 2, a hollow portion 100 having four lenses 11 to 14 and an objective-side opening and an imaging-side opening and into which the four lenses 11 to 14 are inserted with their optical axes aligned is formed. A lens assembly 1 with a lens frame 10 is shown.

  In FIG. 1, the outer peripheral edges of the lenses 11 to 14 are brought into contact with each other so that the optical axes are aligned in the lens frame 10 and the diameter of the lens 11 is increased toward the objective side. -14. Among the four lenses 11 to 14, the lens 14 arranged closest to the object side constitutes an example of the first lens according to the present invention.

  In the example of FIG. 1, an O-ring arrangement portion 141 having a smaller diameter than the objective portion is provided on the imaging side portion of the outer peripheral surface of the first lens 14. The O-ring 15 arranged in the arrangement part 141 is mounted so as to be sandwiched between the O-ring arrangement part 141 and the inner wall of the hollow part 100 of the lens frame 10. The material of the O-ring 15 in this example is ethylene / propylene rubber, silicon rubber, or the like.

  Here, as described above, when the lens assembly 1 shown in FIG. 1 is assembled, the first lens 14 and the O-ring 15 are attached to the lens frame 10 because a considerable pressure is received from the inside of the hollow portion 100. There was a problem that it was difficult to install.

  Therefore, in the present embodiment, as shown in FIG. 2, the first lens 14 placed in the O-ring placement portion 141 is sucked in the direction of the solid arrow from the imaging side opening, and the first lens 14 is placed on the lens frame 10. A method for assembling a lens assembly to be inserted into the hollow portion 100 is proposed.

  FIG. 3 is a process diagram for explaining an assembly process of the lens assembly 1 shown in FIGS.

  First, in the first insertion step S301, the remaining lenses 11 to 13 except for the first lens 14 out of the four lenses 11 to 14 are inserted into the hollow portion 100, and in the next O-ring arrangement step S302. The O-ring 15 is arranged in the O-ring arrangement part 141 of the first lens 14, and the O-ring 15 is put in the O-ring arrangement part 141 while sucking air from the imaging side opening in the final second charging step S303. The first lens 14 in a state where is disposed is inserted from the objective-side opening of the hollow portion 100.

  When the assembly is performed while sucking air from the imaging side opening in this way, the air that should have been sealed in the hollow portion 100 is sucked to the outside from the imaging side opening through a slight gap, and the objective side is drawn from the hollow portion 100. The pressure toward the opening is reduced, and the first lens 14 with the O-ring 15 attached can be easily inserted from the objective side opening.

  For this reason, a lens can be correctly arrange | positioned in the predetermined position in the hollow part 100, and the effect that desired optical performance can be acquired is acquired.

  Further, after mounting the first lens 14 as described above, the front end of the lens frame 10 is bent by heat caulking to hold the lens 14. Alternatively, the assembly is simply completed by bonding the outer peripheral portion of the first lens 14 and the portion where the lens frame 10 is in contact.

  Next, a method for disassembling the lens assembly 1 shown in FIGS. 1 and 2 will be described.

  FIG. 4 is a process diagram illustrating a process of disassembling the lens assembly 1 shown in FIGS.

  In this embodiment, contrary to the assembly, a disassembly method is proposed in which the lens 14 is taken out while blowing air from the imaging side opening in the direction of the dotted arrow shown in FIG.

  When the lens 14 is taken out while blowing air in this way, the air flows through the slight gap in the hollow portion 100 to the objective opening side, so that it becomes easy to remove the objective lens 14. For this reason, the lens in the lens hollow portion 100 can be easily taken out without being damaged, and the taken-out lens can be reused.

  In addition, not only the lens in the hollow portion 100 but also the lens frame 10 can be reused before the lens 14 is fixed by heat caulking or adhesion. After fixing the lens 14 by heat caulking or adhesion, the lens frame 10 can be taken out by the above disassembling method after cutting and removing the portion where the lens frame 10 is fixed.

  As described above, the lens assembly assembling method that allows the lens disposed closest to the object side together with the O-ring to be easily inserted into the hollow portion of the lens frame, and the lens of the lens assembly once assembled. A lens assembly disassembling method that can be easily taken out from the hollow portion of the frame without damaging the lens is realized.

  Finally, an example in which the lens assembly 1 is applied to a camera mounted on an automobile will be described.

  FIG. 5 is a view showing a camera unit 2 including the lens assembly 1 shown in FIGS. 1 and 2.

  FIG. 5 shows a view in which the camera unit 2 is cut along the optical axis and the cut surface is viewed obliquely from above.

  A camera unit 2 shown in FIG. 5 includes the lens assembly 1 shown in FIGS. 1 and 2, a camera body frame 20, and an image sensor 21. The image sensor 21 is mounted on a substrate 210 and is mounted on the camera body. It is fixed to the frame 20 by adhesion. Screw portions are formed on the outer peripheral surface of the lens frame 10 and the inner peripheral surface of the camera body frame 20 of the lens assembly 1 of FIGS.

  When assembling the camera unit 2, first, the lens assembly 1 of FIGS. 1 and 2 is inserted into the camera body frame 20 while being screwed, and then the lens assembly 1 is bonded and fixed to the camera body frame 20. At this time, by applying an adhesive to the outer peripheral edge of the lens frame 10 and the front end portion of the camera body frame 20, waterproofing is performed so that water does not enter the camera unit from the front end side. Further, a substrate 210 on which an image pickup device 21 such as a CCD solid-state image pickup device is mounted is bonded and fixed to the camera body frame 20. The lens assembly 1 shown in FIGS. 1 and 2 can be easily incorporated into the camera unit 2 by such a simple procedure.

It is a perspective view explaining the composition of lens assembly 1 which is one embodiment of the present invention. It is sectional drawing which shows the cut surface of the lens assembly 1 of FIG. FIG. 3 is a process diagram illustrating an assembly process of the lens assembly 1 shown in FIGS. 1 and 2. FIG. 3 is a process diagram illustrating a process of disassembling the lens assembly 1 shown in FIGS. 1 and 2. It is a figure which shows the camera unit 2 provided with the lens assembly 1 shown in FIG. 1, FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens assembly 10 Lens frame 100 Hollow part 11-14 Lens 141 O-ring arrangement | positioning part 15 O-ring 2 Camera unit 20 Camera main body frame 21 Imaging element

Claims (3)

Multiple lenses,
A lens frame having a hollow part in which the plurality of lenses are inserted with the optical axis aligned and having an objective side opening and an imaging side opening;
An O-ring sandwiched between the outer peripheral surface of the first lens disposed on the most object side of the plurality of lenses and the inner wall of the lens frame hollow portion;
A method of assembling a lens assembly, wherein the first lens has an O-ring arrangement portion formed on the imaging side portion of the first lens outer peripheral surface so as to have a smaller diameter than the objective side portion. ,
A first loading step of loading the remaining lens excluding the first lens of the plurality of lenses into the lens hollow portion;
An O-ring arrangement step of arranging an O-ring in the O-ring arrangement portion of the first lens;
A second loading step of loading the first lens in a state where an O-ring is disposed in the O-ring arrangement portion from the objective-side opening of the hollow portion while sucking air from the imaging-side opening; And a method for assembling the lens assembly. A plurality of lenses, a lens frame having an objective-side opening and an imaging-side opening, and having a hollow portion into which the plurality of lenses are inserted with the optical axis aligned, and of the plurality of lenses A method of disassembling a lens assembly comprising an O-ring sandwiched between an outer peripheral surface of a first lens disposed on the most object side and an inner wall of the lens frame hollow portion,
A method for disassembling a lens assembly, comprising: taking out the first lens from the objective side opening while blowing air from the imaging side opening.   An imaging apparatus comprising: a lens assembly assembled by the assembling method according to claim 1; and an imaging element.

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