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Optical unit

A technology of optical unit and optical lens, which is applied in the direction of optical components, optics, instruments, etc., and can solve problems such as lens frame eccentricity, optical performance degradation, and difficulty in maintaining optical performance

Active Publication Date: 2022-05-31
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of this structure, regarding the relationship between the coefficient of linear expansion of the lens frame and the lens holder, it is preferable that the coefficient of linear expansion of the lens frame is greater than that of the lens holder. , the lens frame arranged inside expands more than the lens holder, and excessive stress acts on the lens holder, and an annealing effect occurs in this state, so the lens holder side may not return to its original size when it returns to normal temperature. Unable to maintain press-fit relationship between lens frame and lens holder
If the press-fit relationship is not maintained and there is vibration between the lens frame and the lens holder, it may also cause deterioration of optical performance
In addition, it is also possible to have a certain amount of wobble instead of the original press-fit relationship, but in this case, the lens frame may be eccentric with respect to the lens holder at room temperature, and it may be difficult to maintain stable optical performance.

Method used

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Experimental program
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Effect test

no. 1 approach 〕

[0019] Hereinafter, with reference to the accompanying drawings, an optical unit according to the first embodiment of the present invention and an imaging device provided with the same will be described.

[0020] As shown in FIG. 1 , the optical unit 100 is combined with the sensor unit 50 to constitute an imaging device 200. Optical unit

[0022] FIG. 2A is a diagram illustrating fixing by fitting of the third lens L3 and the fourth lens L4. Fourth lens L4

[0024] FIG. 2B is a diagram illustrating fixing by fitting of the fourth lens L4 and the fifth lens L5. Fourth lens L4

[0030] Above, the first to sixth lenses L1 to L6 have a linear expansion coefficient equal to or smaller than that of the lens holder 20

[0031] The assembly of the optical unit 100 will be briefly described. The lens holder 20 is prepared, and the seventh lens L7 is inserted.

[0032] In the imaging device 200, the sensor unit 50 includes: a solid-state imaging element 51 for capturing images captured b...

no. 2 approach 〕

[0035] Hereinafter, the optical unit of the second embodiment will be described. In addition, the optical unit of the second embodiment is a

no. 3 approach 〕

[0039] Hereinafter, the optical unit of the third embodiment will be described. In addition, the optical unit of the third embodiment is a

[0041] [Other]

[0042] In the above, the optical unit 100 as a specific embodiment has been described, but it is not limited to the present invention.

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Abstract

The present invention provides an optical unit that prevents deterioration of optical performance without excessive stress acting on a lens frame and a lens holder even when temperature changes occur in a high-temperature environment. The optical unit (100) has: a fourth lens (first optical lens) (L4), a lens body (31) made of glass and a lens frame (32) made of resin with the lens body (31) assembled inside; And the third lens (second optical lens) (L3), has a linear expansion coefficient larger than the linear expansion coefficient of the lens frame (32), the lens frame (32) has the first outward fitting portion (4a), the third The lens (second optical lens) (L3) has a first inward fitting portion (3b), and by fitting the first outward fitting portion (4a) with the first inward fitting portion (3b), the The third lens (second optical lens) (L3) is fixed to the lens frame (32).

Description

Optical unit technical field [0001] The present invention relates to an optical unit including a lens as an element, and the lens is formed by a lens frame made of resin. Hold the lens body made of glass. Background technique In applications such as in-vehicle cameras, in order to maintain optical properties even in environmental tests accompanied by large temperature changes Yes, glass material may be used for the lens near the aperture with high sensitivity. In the case of using a glass lens, due to processing However, in some cases, it is not possible to make the outer diameter larger due to the restriction of the A structure in which a glass lens is housed, and the lens frame is pressed into the lens holder member. However, in the case of this configuration, with regard to the relationship between the linear expansion coefficients of the lens frame and the lens holder, it is preferable to Selected as the relationship that the linear expansion coefficient of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/02G02B1/00G03B30/00
CPCG02B7/021G02B1/00
Inventor 新谷昌之船桥章本目成男
Owner KONICA MINOLTA INC