JP2008065261A - Lens mirror frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens mirror frame having a sufficient fixing force for fixing a plurality of lenses and capable of shortening the assembly lead time. <P>SOLUTION: A third-group frame 8 comprising the lens mirror frame keeps a second lens 9 fixed on the front side and a first lens 10 on the rear side in the inside. The lens 10 is inserted in the third-group frame 8 in a state of a butment against a bottom surface part 8c on the subject light outputting side so that an adhesive 11 is injected into the gap between the lens 10 and a fitting part 8b of the third-group frame 8. Then, the second lens 9 is inserted on the front side of the lens 10 such that its rear end part contacts the front side periphery of the lens 10, and then a caulking part 8a of the third-group frame 8 is bent inward by heat caulking for fixing the lens 9 in the third-group frame 8. Thereby, the lenses are fixed independently to attain a sufficient supporting force, and the assembly lead time can be reduced without the need of awaiting solidification of the adhesive. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  Conventionally, in a lens barrel having a plurality of lenses, each lens is usually fixed to the lens barrel member by either caulking or bonding.

  However, the conventional lens frame that employs a plurality of lens fixing methods by either caulking or bonding as described above has problems in strength or production process. For example, when a plurality of lenses are fixed by caulking, a plurality of lenses are fixed by caulking at one place, so that sufficient fixing force cannot be obtained, and there is a risk that the lens will come off if an impact is applied to the lens barrel. was there. On the other hand, when a plurality of lenses are fixed by bonding, a sufficient fixing force can be obtained, but a waiting time for curing the adhesive during assembly is required. For example, after the first lens is bonded and cured, it is necessary to bond the second lens, which increases the assembly lead time.

  The present invention has been made to solve the above-described problem, and has a lens barrel that has a sufficient fixing force for fixing a plurality of lenses and that can shorten an assembly lead time. The purpose is to provide.

  The lens barrel according to claim 1 of the present invention includes a first lens, a second lens, and the first lens, the first lens is held by adhesion, and the second lens A lens frame member mounted in contact with the first lens, and the second lens being fixed by caulking.

  The lens barrel according to claim 2 of the present invention includes a first lens, a second lens, and the first lens, and the first lens is caulked and held, and the second lens And a lens frame member to which the second lens is bonded and fixed.

  According to the present invention, a lens barrel having a sufficient fixing force for fixing a plurality of lenses and capable of shortening an assembly lead time is obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a lens barrel having a lens barrel according to the first embodiment of the present invention. FIG. 2 is a sectional view of the lens barrel.

  As shown in FIG. 1, the lens barrel portion having the lens barrel of the present embodiment includes a first group frame 1, a second group frame 5 and a third group frame 8 that constitute the lens barrel, and are movable forward and backward. It has a fourth group frame 2 and guide shafts 3 and 4 that support the second, third and fourth group frames. The lens barrel is assembled to a box-shaped fixed frame via the guide shafts 3 and 4 and the first group frame 1. The fixed frame is incorporated in a camera body (not shown).

  The first group frame 1 includes a first group lens and a refracting mirror. The object light along the optical axis O1 is refracted by 90 degrees toward the optical axis O2 by the refracting mirror. The light is emitted to the lens 6 side. The fourth group frame 2 is a lens frame member, holds the fourth group lens 16, and is arranged on the CCD unit (not shown) side below the lens barrel.

  The second group frame 5 is a resin-made cylindrical lens frame member, and holds two lenses 6 and 7 that are second group lenses. The third group frame 8 is also a resin-made cylindrical lens frame member, and holds two lenses 9 and 10 which are third group lenses.

  The lenses 6 and 7, the lenses 9 and 10, and the fourth group lens 16 are arranged along the optical axis O2.

  Here, a fixing structure for fixing the lenses 9 and 10 to the third group frame 8 will be described with reference to FIG. The same fixing structure as that of the third group frame 8 can be applied to the fixing structure of the lenses 6 and 7 to the second group frame 5.

  First, the lens 10 that is the first lens is inserted into the emission-side bottom surface portion 8 c of the third group frame 8 in abutting state. Adhesive 11 is injected into the gap between the fitting portion 8 b of the third group frame 8 with the lens 10.

  Subsequently, the lens 9 as the second lens is inserted into the front side of the lens 10, and the rear end portion is brought into contact with the periphery of the front surface of the lens 10. In this contact state, the caulking portion 8 a provided around the inner periphery of the front end of the third group frame 8 is bent inward by heat caulking to fix the lens 9 in the third group frame 8. The adhesive may be injected after the caulking. Further, when the lens frame member is made of metal, mechanical caulking is performed instead of the heat caulking.

  As described above, in the lens barrel of the present embodiment, the lens 10 is also fixed integrally (before the adhesive is cured) through the lens 9 by caulking of the caulking portion 8a, so that the adhesive 11 is completely solidified. The third group frame 8 can be sent to the next assembly process without waiting. Therefore, the assembly lead time can be shortened.

  In addition, each of the two lenses is fixed individually in the third group frame 8. That is, one lens 10 is firmly fixed and held by an adhesive, and the other lens 9 is fixedly held by the caulking portion 8a. Therefore, even if the lens barrel receives an impact force and a force acts on each of the lenses 9 and 10, it is possible to prevent an accident such that each lens falls off the third group frame 8.

  In this embodiment, the two lenses fixed to the lens frame member are single lenses. However, the present invention is not limited to this, and the same fixing structure is applied even if each of the lenses is a compound lens composed of a plurality of lenses. be able to.

  Furthermore, although the plurality of lenses fixed to the lens frame member is two, the present invention is not limited to this, and may be three or more single lenses or three or more compound lenses. In this case, a fixing structure in which at least one of each single lens or compound lens is fixed to the frame member by bonding, and the other is fixed by caulking independently. Moreover, you may apply the adhering structure which fixes each single lens or compound lens each independently only by caulking.

  Next, a lens barrel of the second embodiment of the present invention will be described with reference to a sectional view of the lens barrel of FIG.

  The lens barrel portion to which the lens barrel of this embodiment is applied has the same configuration as the lens barrel portion of the first embodiment, and only the lens fixing structure of the lens barrel is different.

  In the lens barrel of the present embodiment, the third group frame 12 that is a lens frame member includes a plurality of lenses that constitute a third group lens, and includes a lens 14 that is a first lens and a second lens. A lens 13 is held.

  The fixing structure for fixing these lenses will be described. First, as shown in FIG. 3, the lens 14 as the first lens is inserted into the emission side bottom surface portion 12 c of the third group frame 12 in abutting state. The lens 14 is fixed to the third group frame 12 by bending the caulking portion 12 a provided around the inner periphery of the third group frame 12 inward by heat caulking.

  Subsequently, the lens 13 is inserted into the front side of the lens 14, and the rear end portion is brought into contact with the front surface periphery of the lens 14. In this contact state, the adhesive 15 is injected into the gap between the fitting portion 12 b of the third group frame 12 and the lens 13. The third group frame 12 is sent to the next assembly process after the adhesive is solidified.

  As described above, in the lens barrel of the present embodiment, the two lenses are individually fixed to the third group frame 12. That is, one lens 14 is firmly held by the caulking portion 8a, and the other lens 13 is firmly fixed and held by the adhesive. Therefore, even if the lens barrel receives an impact force and a force acts on each of the lenses 13 and 14, it is possible to prevent an accident such that each lens falls off the third group frame 12.

  In this embodiment, the two lenses fixed to the lens frame member are single lenses. However, the present invention is not limited to this, and the same fixing structure is applied even if each of the lenses is a compound lens composed of a plurality of lenses. can do.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  The lens barrel according to the present invention has a sufficient fixing force for fixing a plurality of lenses and can be used as a lens barrel capable of shortening the assembly lead time.

It is a perspective view of the lens-barrel part which has the lens barrel of 1st embodiment of this invention. It is sectional drawing of the 3rd group frame which comprises the lens barrel of FIG. It is sectional drawing of the 3rd group frame which comprises the lens barrel of 2nd embodiment of this invention.

Explanation of symbols

8,12
... Third group frame (lens frame member)
9,13
... Lens (second lens)
10, 14
... Lens (first lens)

Claims (2)

The first lens,
A second lens,
A lens in which the first lens is incorporated, the first lens is held by adhesion, the second lens is assembled in contact with the first lens, and the second lens is caulked and fixed A frame member;
A lens barrel characterized by comprising: The first lens,
A second lens,
The first lens is assembled, the first lens is caulked and held, the second lens is assembled in contact with the first lens, and the second lens is bonded and fixed. A lens frame member;
A lens barrel characterized by comprising:

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