JP2017215452A - Lens unit and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens unit which can be made thinner than before.SOLUTION: A lens unit is employed that includes: a plurality of lenses; a lens frame for housing the plurality of lenses and supporting them; and an additional aperture plate that is arranged further outside the lens arranged re-outwardly and is formed so that a gap is generated partly between the lens and the additional aperture plate.SELECTED DRAWING: Figure 3

Description

  One embodiment of the present invention relates to a lens unit used for an imaging device such as a camera mounted on a mobile phone, a mobile device, a vehicle (eg, a car), or the like.

  An imaging device such as a camera includes a lens unit (lens barrel) that houses and supports a plurality of lenses, and imaging is performed when light from a subject passes through the lens and exposure to the imaging device is performed. Is done. For example, Patent Document 1 discloses a configuration of a conventional lens unit.

JP 2012-058630 A

  By the way, in order to make the imaging device thin, it is necessary to make the lens unit thin. However, there is a limit to making the lens unit thin in the conventional structure. In particular, when adopting a method of fixing the support state of the lens or the like by the lens unit by heat caulking that has been conventionally used, if the lens unit is formed thin, the lens frame portion to be caulked thermally becomes thin, There was a problem that the lens was deformed by the influence of heat during heat caulking.

  The present invention adopts the following means in order to solve the above problems. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to these appendices. It should be construed broadly to the extent that contractors can technically understand.

One means of the present invention is to
Multiple lenses,
A lens frame (1) for storing and supporting the plurality of lenses;
A heat conduction suppressing member (2) disposed further outside the lens (8) disposed on the outer side and formed so as to partially create a gap (A) between the lens and the lens (8).
It is a lens unit.

  According to the lens unit having the above configuration, since a gap is partially formed between the heat conduction suppressing member and the lens, high heat is conducted to the lens when heat is applied to the lens frame by heat caulking. This can be prevented. Accordingly, it is possible to prevent the lens from being deformed or deformed by heat. In addition, since it is not necessary to form the lens frame thick in order to prevent heat conduction due to heat caulking, the lens unit can be thinned.

In the lens unit, preferably,
The lens frame is formed to support the heat conduction suppressing member by heat caulking.

  Further, the present invention includes an imaging device such as a camera provided with any of the lens units described above.

  The imaging device having the above configuration can be configured to be relatively thin.

FIG. The disassembled perspective view of the lens unit of this embodiment. Sectional drawing of the lens unit of this embodiment. Sectional drawing of the lens unit of a comparative example.

An embodiment according to the present invention will be specifically described according to the following configuration with reference to the drawings. However, the embodiment described below is merely an example of the present invention and does not limit the technical scope of the present invention. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and the description may be abbreviate | omitted.
1. Embodiment 2. FIG. Supplementary matter

<1. Embodiment>
The lens unit (also referred to as a lens barrel) of the present embodiment is formed so as to fix and support the lens by thermal caulking of the lens frame, and the lens closest to the portion to be caulked (disposed closest to the imaging device) One of the characteristics is that an additional member (additional aperture plate) that suppresses heat conduction is disposed outside (lens) (on the imaging element side). The lens unit of the present embodiment is used in an imaging apparatus such as a camera. Such an imaging apparatus includes conventional configurations such as a shutter unit and an imaging element in addition to the lens unit of the present embodiment. Hereinafter, the lens unit of the present embodiment will be specifically described.

  FIG. 1 is a perspective view of the lens unit of the present embodiment. FIG. 1A is a diagram viewed from the subject side, and FIG. 1B is a diagram viewed from the image sensor side (the side opposite to the subject side). FIG. 2 is an exploded perspective view of the lens unit of the present embodiment. FIG. 3 is a cross-sectional view of the lens unit of the present embodiment.

  As shown in FIGS. 1 to 3, the lens unit of the present embodiment is configured to accommodate and support a plurality of lenses by a lens frame 1 and an additional aperture plate (also referred to as a caulking aperture plate) 2. Between the lens frame 1 and the additional aperture plate 2, the first lens 3, the aperture plate 4, the second and third lenses 5, the spacer 6, the fourth lens 7, and the fifth lens 8 are arranged. As shown in FIG. 3, the second and third lenses 5 include a second lens 5a and a third lens 5b.

<Lens frame 1>
The lens frame 1 is an outer frame of the lens unit, and is configured to accommodate and support a plurality of lenses, an aperture plate, and an additional aperture plate 2. An opening 1a is formed on the subject side of the lens frame 1, and the first lens 3 can be seen from the opening 1a. The opening 1 a is smaller than the first lens 3, and as shown in FIG. 3, the movement of the first lens 3 in the optical axis direction is restricted by the lens frame 1.

  On the other hand, an additional aperture plate 2 is disposed inside the lens frame 1 on the image sensor side (the side opposite to the subject). The imaging element side of the lens frame 1 is formed of a resin that dissolves by heating. When assembling the lens unit, the lens frame 1 is melted by heat caulking by heating and then solidified (portion 1b in FIG. 3), thereby restricting movement of the additional aperture plate 2 in the optical axis direction. The image sensor side of the lens frame 1 is formed so that its diameter is larger than the diameter of the additional aperture plate 2 before being heated. When the lens unit is assembled, all the lenses from the image sensor side are formed. , Aperture plates, and additional aperture plates are incorporated.

<Additional aperture plate 2>
The additional aperture plate 2 is disposed inside the lens frame 1 and at a position closest to the image sensor. An opening 2a is formed in the additional aperture plate 2, and light is transmitted from the opening 2a to the image sensor side during imaging. The additional aperture plate 2 is made of, for example, a metal material having a low thermal conductivity such as stainless steel, and prevents heat from being caulked to the fifth lens 8 (final lens). Further, the additional aperture plate 2 has a shape with a beveled and sloped portion like the fifth lens 8, and is further formed to have a gap “A” with respect to the fifth lens 8. By forming such a gap “A”, it is effectively prevented that heat during heat caulking is conducted to the fifth lens 8. The additional aperture plate 2 also has a function as a aperture plate. The additional aperture plate 2 of the present embodiment is an example of a heat conduction suppressing member of the present invention.

<Lens>
As shown in FIGS. 1 to 3, the lens unit has a plurality of lenses including a first lens 3, second and third lenses 5, a fourth lens 7, and a fifth lens 8. These lenses are made of, for example, plastic, and are easy to mold, but have a characteristic of being weak against heat. Therefore, in the present embodiment, a configuration in which heat is difficult to conduct to the lens is adopted. The aperture plate 4 is disposed in the middle of the plurality of lenses included in the lens unit, and has a function of regulating the amount of light from the subject side. The spacer 6 is disposed in the middle of the plurality of lenses included in the lens unit, and has a function of appropriately maintaining the distance between the lenses.

<Comparative example>
FIG. 4 shows a lens unit that does not include the additional aperture plate 2, unlike the present embodiment. In the lens unit having such a configuration, when the imaging element side of the lens frame 1 is heated due to heat caulking, the lens frame 1 melted by heating directly contacts the fifth lens 8 at a position “B” or the like. become. As described above, since the plastic lens is vulnerable to heat, the fifth lens 8 at the position “B” with which the heated lens frame 1 comes into contact is deformed or deformed. If the fifth lens 8 is deformed or deformed, the refractive index of the light passing from the subject side is changed. As a result, unintentional distortion or the like occurs in the imaging result obtained by the imaging apparatus equipped with the lens unit.

  On the other hand, since the lens unit of the present embodiment includes the additional aperture plate 2, the fifth lens 8 can be prevented from being deformed or deformed. Therefore, it is possible to prevent the occurrence of problems in the imaging result as described above.

  Further, since it is difficult to conduct heat to the fifth lens 8, it is not necessary to form the lens frame 1 thick for the purpose of preventing heat conduction to the fifth lens 8. The size (thickness) can be reduced. As a result, the thickness of the lens frame 1 in the optical axis direction can be reduced, and as a result, the thickness of the lens unit in the optical axis direction can be reduced. Furthermore, it is possible to reduce the thickness of an imaging apparatus such as a camera equipped with this lens unit.

<2. Supplementary items>
The specific description of the embodiment of the present invention has been given above. The above description is merely an embodiment, and the scope of the present invention is not limited to this embodiment, and is broadly interpreted to the extent that a person skilled in the art can grasp based on the same technical idea. is there.

  In the above embodiment, the lens unit including five lenses from the first lens 3 to the fifth lens 8 is described as an example, but the number of lenses can be arbitrarily changed. Further, the position of the aperture plate 4 can be arbitrarily changed. Moreover, the spacer 6 should just be arrange | positioned as needed, does not need to be arrange | positioned, and may be arranged in multiple numbers.

  In the lens unit of the above-described embodiment, the example in which each lens is formed of plastic has been described. However, these lenses may be formed of a material other than plastic (for example, glass). The configuration of the present embodiment has a certain effect.

  In the above embodiment, only the characteristic part of the present invention has been described. However, the lens unit of the present invention further includes various configurations of the conventional lens unit.

  The lens unit of the present invention is suitably used for an imaging apparatus such as a relatively thin camera.

DESCRIPTION OF SYMBOLS 1 ... Lens frame 1a ... Opening part 2 ... Additional aperture plate 2a ... Opening part 3 ... 1st lens 4 ... Aperture plate 5a ... 2nd lens 5b ... 3rd lens 6 ... Spacer 7 ... 4th lens 8 ... 5th lens

Claims (3)

Multiple lenses,
A lens frame for storing and supporting the plurality of lenses;
A heat conduction suppressing member that is disposed further outside the lens disposed on the outer side and is formed so that a gap is partially formed between the lens and the lens.
Lens unit. The lens frame is formed to support the heat conduction suppressing member by heat caulking,
The lens unit according to claim 1.   An imaging device comprising the lens unit according to claim 1.

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